1725 lines
59 KiB
C
1725 lines
59 KiB
C
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// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Copyright (C) 2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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* Copyright (c) 2016-2020 INRIA, CMU and Microsoft Corporation
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*/
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#include <crypto/curve25519.h>
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#include <crypto/internal/kpp.h>
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#include <linux/types.h>
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <asm/cpufeature.h>
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#include <asm/processor.h>
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static __always_inline u64 eq_mask(u64 a, u64 b)
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{
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u64 x = a ^ b;
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u64 minus_x = ~x + (u64)1U;
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u64 x_or_minus_x = x | minus_x;
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u64 xnx = x_or_minus_x >> (u32)63U;
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return xnx - (u64)1U;
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}
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static __always_inline u64 gte_mask(u64 a, u64 b)
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{
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u64 x = a;
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u64 y = b;
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u64 x_xor_y = x ^ y;
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u64 x_sub_y = x - y;
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u64 x_sub_y_xor_y = x_sub_y ^ y;
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u64 q = x_xor_y | x_sub_y_xor_y;
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u64 x_xor_q = x ^ q;
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u64 x_xor_q_ = x_xor_q >> (u32)63U;
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return x_xor_q_ - (u64)1U;
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}
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/* Computes the addition of four-element f1 with value in f2
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* and returns the carry (if any) */
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static inline u64 add_scalar(u64 *out, const u64 *f1, u64 f2)
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{
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u64 carry_r;
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asm volatile(
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/* Clear registers to propagate the carry bit */
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" xor %%r8d, %%r8d;"
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" xor %%r9d, %%r9d;"
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" xor %%r10d, %%r10d;"
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" xor %%r11d, %%r11d;"
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" xor %k1, %k1;"
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/* Begin addition chain */
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" addq 0(%3), %0;"
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" movq %0, 0(%2);"
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" adcxq 8(%3), %%r8;"
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" movq %%r8, 8(%2);"
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" adcxq 16(%3), %%r9;"
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" movq %%r9, 16(%2);"
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" adcxq 24(%3), %%r10;"
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" movq %%r10, 24(%2);"
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/* Return the carry bit in a register */
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" adcx %%r11, %1;"
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: "+&r"(f2), "=&r"(carry_r)
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: "r"(out), "r"(f1)
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: "%r8", "%r9", "%r10", "%r11", "memory", "cc");
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return carry_r;
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}
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/* Computes the field addition of two field elements */
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static inline void fadd(u64 *out, const u64 *f1, const u64 *f2)
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{
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asm volatile(
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/* Compute the raw addition of f1 + f2 */
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" movq 0(%0), %%r8;"
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" addq 0(%2), %%r8;"
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" movq 8(%0), %%r9;"
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" adcxq 8(%2), %%r9;"
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" movq 16(%0), %%r10;"
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" adcxq 16(%2), %%r10;"
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" movq 24(%0), %%r11;"
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" adcxq 24(%2), %%r11;"
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/* Wrap the result back into the field */
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/* Step 1: Compute carry*38 */
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" mov $0, %%rax;"
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" mov $38, %0;"
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" cmovc %0, %%rax;"
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/* Step 2: Add carry*38 to the original sum */
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" xor %%ecx, %%ecx;"
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" add %%rax, %%r8;"
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" adcx %%rcx, %%r9;"
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" movq %%r9, 8(%1);"
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" adcx %%rcx, %%r10;"
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" movq %%r10, 16(%1);"
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" adcx %%rcx, %%r11;"
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" movq %%r11, 24(%1);"
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/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
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" mov $0, %%rax;"
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" cmovc %0, %%rax;"
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" add %%rax, %%r8;"
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" movq %%r8, 0(%1);"
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: "+&r"(f2)
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: "r"(out), "r"(f1)
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: "%rax", "%rcx", "%r8", "%r9", "%r10", "%r11", "memory", "cc");
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}
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/* Computes the field subtraction of two field elements */
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static inline void fsub(u64 *out, const u64 *f1, const u64 *f2)
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{
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asm volatile(
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/* Compute the raw subtraction of f1-f2 */
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" movq 0(%1), %%r8;"
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" subq 0(%2), %%r8;"
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" movq 8(%1), %%r9;"
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" sbbq 8(%2), %%r9;"
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" movq 16(%1), %%r10;"
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" sbbq 16(%2), %%r10;"
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" movq 24(%1), %%r11;"
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" sbbq 24(%2), %%r11;"
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/* Wrap the result back into the field */
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/* Step 1: Compute carry*38 */
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" mov $0, %%rax;"
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" mov $38, %%rcx;"
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" cmovc %%rcx, %%rax;"
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/* Step 2: Subtract carry*38 from the original difference */
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" sub %%rax, %%r8;"
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" sbb $0, %%r9;"
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" sbb $0, %%r10;"
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" sbb $0, %%r11;"
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/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
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" mov $0, %%rax;"
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" cmovc %%rcx, %%rax;"
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" sub %%rax, %%r8;"
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/* Store the result */
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" movq %%r8, 0(%0);"
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" movq %%r9, 8(%0);"
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" movq %%r10, 16(%0);"
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" movq %%r11, 24(%0);"
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:
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: "r"(out), "r"(f1), "r"(f2)
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: "%rax", "%rcx", "%r8", "%r9", "%r10", "%r11", "memory", "cc");
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}
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/* Computes a field multiplication: out <- f1 * f2
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* Uses the 8-element buffer tmp for intermediate results */
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static inline void fmul(u64 *out, const u64 *f1, const u64 *f2, u64 *tmp)
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{
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asm volatile(
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/* Compute the raw multiplication: tmp <- src1 * src2 */
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/* Compute src1[0] * src2 */
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" movq 0(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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" xor %%r10d, %%r10d;"
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" movq %%r8, 0(%2);"
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" mulxq 8(%1), %%r10, %%r11;"
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" adox %%r9, %%r10;"
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" movq %%r10, 8(%2);"
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" mulxq 16(%1), %%rbx, %%r13;"
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" adox %%r11, %%rbx;"
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" mulxq 24(%1), %%r14, %%rdx;"
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" adox %%r13, %%r14;"
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" mov $0, %%rax;"
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" adox %%rdx, %%rax;"
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/* Compute src1[1] * src2 */
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" movq 8(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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" xor %%r10d, %%r10d;"
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" adcxq 8(%2), %%r8;"
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" movq %%r8, 8(%2);"
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" mulxq 8(%1), %%r10, %%r11;"
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" adox %%r9, %%r10;"
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" adcx %%rbx, %%r10;"
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" movq %%r10, 16(%2);"
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" mulxq 16(%1), %%rbx, %%r13;"
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" adox %%r11, %%rbx;"
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" adcx %%r14, %%rbx;"
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" mov $0, %%r8;"
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" mulxq 24(%1), %%r14, %%rdx;"
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" adox %%r13, %%r14;"
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" adcx %%rax, %%r14;"
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" mov $0, %%rax;"
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" adox %%rdx, %%rax;"
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" adcx %%r8, %%rax;"
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/* Compute src1[2] * src2 */
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" movq 16(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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" xor %%r10d, %%r10d;"
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" adcxq 16(%2), %%r8;"
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" movq %%r8, 16(%2);"
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" mulxq 8(%1), %%r10, %%r11;"
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" adox %%r9, %%r10;"
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" adcx %%rbx, %%r10;"
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" movq %%r10, 24(%2);"
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" mulxq 16(%1), %%rbx, %%r13;"
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" adox %%r11, %%rbx;"
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" adcx %%r14, %%rbx;"
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" mov $0, %%r8;"
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" mulxq 24(%1), %%r14, %%rdx;"
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" adox %%r13, %%r14;"
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" adcx %%rax, %%r14;"
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" mov $0, %%rax;"
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" adox %%rdx, %%rax;"
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" adcx %%r8, %%rax;"
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/* Compute src1[3] * src2 */
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" movq 24(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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" xor %%r10d, %%r10d;"
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" adcxq 24(%2), %%r8;"
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" movq %%r8, 24(%2);"
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" mulxq 8(%1), %%r10, %%r11;"
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" adox %%r9, %%r10;"
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" adcx %%rbx, %%r10;"
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" movq %%r10, 32(%2);"
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" mulxq 16(%1), %%rbx, %%r13;"
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" adox %%r11, %%rbx;"
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" adcx %%r14, %%rbx;"
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" movq %%rbx, 40(%2);"
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" mov $0, %%r8;"
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" mulxq 24(%1), %%r14, %%rdx;"
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" adox %%r13, %%r14;"
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" adcx %%rax, %%r14;"
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" movq %%r14, 48(%2);"
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" mov $0, %%rax;"
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" adox %%rdx, %%rax;"
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" adcx %%r8, %%rax;"
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" movq %%rax, 56(%2);"
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/* Line up pointers */
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" mov %2, %0;"
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" mov %3, %2;"
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/* Wrap the result back into the field */
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/* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */
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" mov $38, %%rdx;"
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" mulxq 32(%0), %%r8, %%r13;"
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" xor %k1, %k1;"
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" adoxq 0(%0), %%r8;"
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" mulxq 40(%0), %%r9, %%rbx;"
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" adcx %%r13, %%r9;"
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" adoxq 8(%0), %%r9;"
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" mulxq 48(%0), %%r10, %%r13;"
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" adcx %%rbx, %%r10;"
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" adoxq 16(%0), %%r10;"
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" mulxq 56(%0), %%r11, %%rax;"
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" adcx %%r13, %%r11;"
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" adoxq 24(%0), %%r11;"
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" adcx %1, %%rax;"
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" adox %1, %%rax;"
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" imul %%rdx, %%rax;"
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/* Step 2: Fold the carry back into dst */
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" add %%rax, %%r8;"
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" adcx %1, %%r9;"
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" movq %%r9, 8(%2);"
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" adcx %1, %%r10;"
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" movq %%r10, 16(%2);"
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" adcx %1, %%r11;"
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" movq %%r11, 24(%2);"
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/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
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" mov $0, %%rax;"
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" cmovc %%rdx, %%rax;"
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" add %%rax, %%r8;"
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" movq %%r8, 0(%2);"
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: "+&r"(f1), "+&r"(f2), "+&r"(tmp)
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: "r"(out)
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: "%rax", "%rbx", "%rdx", "%r8", "%r9", "%r10", "%r11", "%r13",
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"%r14", "memory", "cc");
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}
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/* Computes two field multiplications:
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* out[0] <- f1[0] * f2[0]
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* out[1] <- f1[1] * f2[1]
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* Uses the 16-element buffer tmp for intermediate results: */
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static inline void fmul2(u64 *out, const u64 *f1, const u64 *f2, u64 *tmp)
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{
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asm volatile(
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/* Compute the raw multiplication tmp[0] <- f1[0] * f2[0] */
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/* Compute src1[0] * src2 */
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" movq 0(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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" xor %%r10d, %%r10d;"
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" movq %%r8, 0(%2);"
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" mulxq 8(%1), %%r10, %%r11;"
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" adox %%r9, %%r10;"
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" movq %%r10, 8(%2);"
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" mulxq 16(%1), %%rbx, %%r13;"
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" adox %%r11, %%rbx;"
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" mulxq 24(%1), %%r14, %%rdx;"
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" adox %%r13, %%r14;"
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" mov $0, %%rax;"
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" adox %%rdx, %%rax;"
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/* Compute src1[1] * src2 */
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" movq 8(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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" xor %%r10d, %%r10d;"
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" adcxq 8(%2), %%r8;"
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" movq %%r8, 8(%2);"
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" mulxq 8(%1), %%r10, %%r11;"
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" adox %%r9, %%r10;"
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" adcx %%rbx, %%r10;"
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" movq %%r10, 16(%2);"
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" mulxq 16(%1), %%rbx, %%r13;"
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" adox %%r11, %%rbx;"
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" adcx %%r14, %%rbx;"
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" mov $0, %%r8;"
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" mulxq 24(%1), %%r14, %%rdx;"
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" adox %%r13, %%r14;"
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" adcx %%rax, %%r14;"
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" mov $0, %%rax;"
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" adox %%rdx, %%rax;"
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" adcx %%r8, %%rax;"
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/* Compute src1[2] * src2 */
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" movq 16(%0), %%rdx;"
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" mulxq 0(%1), %%r8, %%r9;"
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||
|
|
" xor %%r10d, %%r10d;"
|
||
|
|
" adcxq 16(%2), %%r8;"
|
||
|
|
" movq %%r8, 16(%2);"
|
||
|
|
" mulxq 8(%1), %%r10, %%r11;"
|
||
|
|
" adox %%r9, %%r10;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" movq %%r10, 24(%2);"
|
||
|
|
" mulxq 16(%1), %%rbx, %%r13;"
|
||
|
|
" adox %%r11, %%rbx;"
|
||
|
|
" adcx %%r14, %%rbx;"
|
||
|
|
" mov $0, %%r8;"
|
||
|
|
" mulxq 24(%1), %%r14, %%rdx;"
|
||
|
|
" adox %%r13, %%r14;"
|
||
|
|
" adcx %%rax, %%r14;"
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" adox %%rdx, %%rax;"
|
||
|
|
" adcx %%r8, %%rax;"
|
||
|
|
|
||
|
|
/* Compute src1[3] * src2 */
|
||
|
|
" movq 24(%0), %%rdx;"
|
||
|
|
" mulxq 0(%1), %%r8, %%r9;"
|
||
|
|
" xor %%r10d, %%r10d;"
|
||
|
|
" adcxq 24(%2), %%r8;"
|
||
|
|
" movq %%r8, 24(%2);"
|
||
|
|
" mulxq 8(%1), %%r10, %%r11;"
|
||
|
|
" adox %%r9, %%r10;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" movq %%r10, 32(%2);"
|
||
|
|
" mulxq 16(%1), %%rbx, %%r13;"
|
||
|
|
" adox %%r11, %%rbx;"
|
||
|
|
" adcx %%r14, %%rbx;"
|
||
|
|
" movq %%rbx, 40(%2);"
|
||
|
|
" mov $0, %%r8;"
|
||
|
|
" mulxq 24(%1), %%r14, %%rdx;"
|
||
|
|
" adox %%r13, %%r14;"
|
||
|
|
" adcx %%rax, %%r14;"
|
||
|
|
" movq %%r14, 48(%2);"
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" adox %%rdx, %%rax;"
|
||
|
|
" adcx %%r8, %%rax;"
|
||
|
|
" movq %%rax, 56(%2);"
|
||
|
|
|
||
|
|
/* Compute the raw multiplication tmp[1] <- f1[1] * f2[1] */
|
||
|
|
|
||
|
|
/* Compute src1[0] * src2 */
|
||
|
|
" movq 32(%0), %%rdx;"
|
||
|
|
" mulxq 32(%1), %%r8, %%r9;"
|
||
|
|
" xor %%r10d, %%r10d;"
|
||
|
|
" movq %%r8, 64(%2);"
|
||
|
|
" mulxq 40(%1), %%r10, %%r11;"
|
||
|
|
" adox %%r9, %%r10;"
|
||
|
|
" movq %%r10, 72(%2);"
|
||
|
|
" mulxq 48(%1), %%rbx, %%r13;"
|
||
|
|
" adox %%r11, %%rbx;"
|
||
|
|
" mulxq 56(%1), %%r14, %%rdx;"
|
||
|
|
" adox %%r13, %%r14;"
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" adox %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Compute src1[1] * src2 */
|
||
|
|
" movq 40(%0), %%rdx;"
|
||
|
|
" mulxq 32(%1), %%r8, %%r9;"
|
||
|
|
" xor %%r10d, %%r10d;"
|
||
|
|
" adcxq 72(%2), %%r8;"
|
||
|
|
" movq %%r8, 72(%2);"
|
||
|
|
" mulxq 40(%1), %%r10, %%r11;"
|
||
|
|
" adox %%r9, %%r10;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" movq %%r10, 80(%2);"
|
||
|
|
" mulxq 48(%1), %%rbx, %%r13;"
|
||
|
|
" adox %%r11, %%rbx;"
|
||
|
|
" adcx %%r14, %%rbx;"
|
||
|
|
" mov $0, %%r8;"
|
||
|
|
" mulxq 56(%1), %%r14, %%rdx;"
|
||
|
|
" adox %%r13, %%r14;"
|
||
|
|
" adcx %%rax, %%r14;"
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" adox %%rdx, %%rax;"
|
||
|
|
" adcx %%r8, %%rax;"
|
||
|
|
|
||
|
|
/* Compute src1[2] * src2 */
|
||
|
|
" movq 48(%0), %%rdx;"
|
||
|
|
" mulxq 32(%1), %%r8, %%r9;"
|
||
|
|
" xor %%r10d, %%r10d;"
|
||
|
|
" adcxq 80(%2), %%r8;"
|
||
|
|
" movq %%r8, 80(%2);"
|
||
|
|
" mulxq 40(%1), %%r10, %%r11;"
|
||
|
|
" adox %%r9, %%r10;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" movq %%r10, 88(%2);"
|
||
|
|
" mulxq 48(%1), %%rbx, %%r13;"
|
||
|
|
" adox %%r11, %%rbx;"
|
||
|
|
" adcx %%r14, %%rbx;"
|
||
|
|
" mov $0, %%r8;"
|
||
|
|
" mulxq 56(%1), %%r14, %%rdx;"
|
||
|
|
" adox %%r13, %%r14;"
|
||
|
|
" adcx %%rax, %%r14;"
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" adox %%rdx, %%rax;"
|
||
|
|
" adcx %%r8, %%rax;"
|
||
|
|
|
||
|
|
/* Compute src1[3] * src2 */
|
||
|
|
" movq 56(%0), %%rdx;"
|
||
|
|
" mulxq 32(%1), %%r8, %%r9;"
|
||
|
|
" xor %%r10d, %%r10d;"
|
||
|
|
" adcxq 88(%2), %%r8;"
|
||
|
|
" movq %%r8, 88(%2);"
|
||
|
|
" mulxq 40(%1), %%r10, %%r11;"
|
||
|
|
" adox %%r9, %%r10;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" movq %%r10, 96(%2);"
|
||
|
|
" mulxq 48(%1), %%rbx, %%r13;"
|
||
|
|
" adox %%r11, %%rbx;"
|
||
|
|
" adcx %%r14, %%rbx;"
|
||
|
|
" movq %%rbx, 104(%2);"
|
||
|
|
" mov $0, %%r8;"
|
||
|
|
" mulxq 56(%1), %%r14, %%rdx;"
|
||
|
|
" adox %%r13, %%r14;"
|
||
|
|
" adcx %%rax, %%r14;"
|
||
|
|
" movq %%r14, 112(%2);"
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" adox %%rdx, %%rax;"
|
||
|
|
" adcx %%r8, %%rax;"
|
||
|
|
" movq %%rax, 120(%2);"
|
||
|
|
|
||
|
|
/* Line up pointers */
|
||
|
|
" mov %2, %0;"
|
||
|
|
" mov %3, %2;"
|
||
|
|
|
||
|
|
/* Wrap the results back into the field */
|
||
|
|
|
||
|
|
/* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */
|
||
|
|
" mov $38, %%rdx;"
|
||
|
|
" mulxq 32(%0), %%r8, %%r13;"
|
||
|
|
" xor %k1, %k1;"
|
||
|
|
" adoxq 0(%0), %%r8;"
|
||
|
|
" mulxq 40(%0), %%r9, %%rbx;"
|
||
|
|
" adcx %%r13, %%r9;"
|
||
|
|
" adoxq 8(%0), %%r9;"
|
||
|
|
" mulxq 48(%0), %%r10, %%r13;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" adoxq 16(%0), %%r10;"
|
||
|
|
" mulxq 56(%0), %%r11, %%rax;"
|
||
|
|
" adcx %%r13, %%r11;"
|
||
|
|
" adoxq 24(%0), %%r11;"
|
||
|
|
" adcx %1, %%rax;"
|
||
|
|
" adox %1, %%rax;"
|
||
|
|
" imul %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Step 2: Fold the carry back into dst */
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" adcx %1, %%r9;"
|
||
|
|
" movq %%r9, 8(%2);"
|
||
|
|
" adcx %1, %%r10;"
|
||
|
|
" movq %%r10, 16(%2);"
|
||
|
|
" adcx %1, %%r11;"
|
||
|
|
" movq %%r11, 24(%2);"
|
||
|
|
|
||
|
|
/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" cmovc %%rdx, %%rax;"
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" movq %%r8, 0(%2);"
|
||
|
|
|
||
|
|
/* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */
|
||
|
|
" mov $38, %%rdx;"
|
||
|
|
" mulxq 96(%0), %%r8, %%r13;"
|
||
|
|
" xor %k1, %k1;"
|
||
|
|
" adoxq 64(%0), %%r8;"
|
||
|
|
" mulxq 104(%0), %%r9, %%rbx;"
|
||
|
|
" adcx %%r13, %%r9;"
|
||
|
|
" adoxq 72(%0), %%r9;"
|
||
|
|
" mulxq 112(%0), %%r10, %%r13;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" adoxq 80(%0), %%r10;"
|
||
|
|
" mulxq 120(%0), %%r11, %%rax;"
|
||
|
|
" adcx %%r13, %%r11;"
|
||
|
|
" adoxq 88(%0), %%r11;"
|
||
|
|
" adcx %1, %%rax;"
|
||
|
|
" adox %1, %%rax;"
|
||
|
|
" imul %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Step 2: Fold the carry back into dst */
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" adcx %1, %%r9;"
|
||
|
|
" movq %%r9, 40(%2);"
|
||
|
|
" adcx %1, %%r10;"
|
||
|
|
" movq %%r10, 48(%2);"
|
||
|
|
" adcx %1, %%r11;"
|
||
|
|
" movq %%r11, 56(%2);"
|
||
|
|
|
||
|
|
/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" cmovc %%rdx, %%rax;"
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" movq %%r8, 32(%2);"
|
||
|
|
: "+&r"(f1), "+&r"(f2), "+&r"(tmp)
|
||
|
|
: "r"(out)
|
||
|
|
: "%rax", "%rbx", "%rdx", "%r8", "%r9", "%r10", "%r11", "%r13",
|
||
|
|
"%r14", "memory", "cc");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Computes the field multiplication of four-element f1 with value in f2
|
||
|
|
* Requires f2 to be smaller than 2^17 */
|
||
|
|
static inline void fmul_scalar(u64 *out, const u64 *f1, u64 f2)
|
||
|
|
{
|
||
|
|
register u64 f2_r asm("rdx") = f2;
|
||
|
|
|
||
|
|
asm volatile(
|
||
|
|
/* Compute the raw multiplication of f1*f2 */
|
||
|
|
" mulxq 0(%2), %%r8, %%rcx;" /* f1[0]*f2 */
|
||
|
|
" mulxq 8(%2), %%r9, %%rbx;" /* f1[1]*f2 */
|
||
|
|
" add %%rcx, %%r9;"
|
||
|
|
" mov $0, %%rcx;"
|
||
|
|
" mulxq 16(%2), %%r10, %%r13;" /* f1[2]*f2 */
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" mulxq 24(%2), %%r11, %%rax;" /* f1[3]*f2 */
|
||
|
|
" adcx %%r13, %%r11;"
|
||
|
|
" adcx %%rcx, %%rax;"
|
||
|
|
|
||
|
|
/* Wrap the result back into the field */
|
||
|
|
|
||
|
|
/* Step 1: Compute carry*38 */
|
||
|
|
" mov $38, %%rdx;"
|
||
|
|
" imul %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Step 2: Fold the carry back into dst */
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" adcx %%rcx, %%r9;"
|
||
|
|
" movq %%r9, 8(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 16(%1);"
|
||
|
|
" adcx %%rcx, %%r11;"
|
||
|
|
" movq %%r11, 24(%1);"
|
||
|
|
|
||
|
|
/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" cmovc %%rdx, %%rax;"
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" movq %%r8, 0(%1);"
|
||
|
|
: "+&r"(f2_r)
|
||
|
|
: "r"(out), "r"(f1)
|
||
|
|
: "%rax", "%rbx", "%rcx", "%r8", "%r9", "%r10", "%r11", "%r13",
|
||
|
|
"memory", "cc");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Computes p1 <- bit ? p2 : p1 in constant time */
|
||
|
|
static inline void cswap2(u64 bit, const u64 *p1, const u64 *p2)
|
||
|
|
{
|
||
|
|
asm volatile(
|
||
|
|
/* Transfer bit into CF flag */
|
||
|
|
" add $18446744073709551615, %0;"
|
||
|
|
|
||
|
|
/* cswap p1[0], p2[0] */
|
||
|
|
" movq 0(%1), %%r8;"
|
||
|
|
" movq 0(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 0(%1);"
|
||
|
|
" movq %%r9, 0(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[1], p2[1] */
|
||
|
|
" movq 8(%1), %%r8;"
|
||
|
|
" movq 8(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 8(%1);"
|
||
|
|
" movq %%r9, 8(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[2], p2[2] */
|
||
|
|
" movq 16(%1), %%r8;"
|
||
|
|
" movq 16(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 16(%1);"
|
||
|
|
" movq %%r9, 16(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[3], p2[3] */
|
||
|
|
" movq 24(%1), %%r8;"
|
||
|
|
" movq 24(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 24(%1);"
|
||
|
|
" movq %%r9, 24(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[4], p2[4] */
|
||
|
|
" movq 32(%1), %%r8;"
|
||
|
|
" movq 32(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 32(%1);"
|
||
|
|
" movq %%r9, 32(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[5], p2[5] */
|
||
|
|
" movq 40(%1), %%r8;"
|
||
|
|
" movq 40(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 40(%1);"
|
||
|
|
" movq %%r9, 40(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[6], p2[6] */
|
||
|
|
" movq 48(%1), %%r8;"
|
||
|
|
" movq 48(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 48(%1);"
|
||
|
|
" movq %%r9, 48(%2);"
|
||
|
|
|
||
|
|
/* cswap p1[7], p2[7] */
|
||
|
|
" movq 56(%1), %%r8;"
|
||
|
|
" movq 56(%2), %%r9;"
|
||
|
|
" mov %%r8, %%r10;"
|
||
|
|
" cmovc %%r9, %%r8;"
|
||
|
|
" cmovc %%r10, %%r9;"
|
||
|
|
" movq %%r8, 56(%1);"
|
||
|
|
" movq %%r9, 56(%2);"
|
||
|
|
: "+&r"(bit)
|
||
|
|
: "r"(p1), "r"(p2)
|
||
|
|
: "%r8", "%r9", "%r10", "memory", "cc");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Computes the square of a field element: out <- f * f
|
||
|
|
* Uses the 8-element buffer tmp for intermediate results */
|
||
|
|
static inline void fsqr(u64 *out, const u64 *f, u64 *tmp)
|
||
|
|
{
|
||
|
|
asm volatile(
|
||
|
|
/* Compute the raw multiplication: tmp <- f * f */
|
||
|
|
|
||
|
|
/* Step 1: Compute all partial products */
|
||
|
|
" movq 0(%0), %%rdx;" /* f[0] */
|
||
|
|
" mulxq 8(%0), %%r8, %%r14;"
|
||
|
|
" xor %%r15d, %%r15d;" /* f[1]*f[0] */
|
||
|
|
" mulxq 16(%0), %%r9, %%r10;"
|
||
|
|
" adcx %%r14, %%r9;" /* f[2]*f[0] */
|
||
|
|
" mulxq 24(%0), %%rax, %%rcx;"
|
||
|
|
" adcx %%rax, %%r10;" /* f[3]*f[0] */
|
||
|
|
" movq 24(%0), %%rdx;" /* f[3] */
|
||
|
|
" mulxq 8(%0), %%r11, %%rbx;"
|
||
|
|
" adcx %%rcx, %%r11;" /* f[1]*f[3] */
|
||
|
|
" mulxq 16(%0), %%rax, %%r13;"
|
||
|
|
" adcx %%rax, %%rbx;" /* f[2]*f[3] */
|
||
|
|
" movq 8(%0), %%rdx;"
|
||
|
|
" adcx %%r15, %%r13;" /* f1 */
|
||
|
|
" mulxq 16(%0), %%rax, %%rcx;"
|
||
|
|
" mov $0, %%r14;" /* f[2]*f[1] */
|
||
|
|
|
||
|
|
/* Step 2: Compute two parallel carry chains */
|
||
|
|
" xor %%r15d, %%r15d;"
|
||
|
|
" adox %%rax, %%r10;"
|
||
|
|
" adcx %%r8, %%r8;"
|
||
|
|
" adox %%rcx, %%r11;"
|
||
|
|
" adcx %%r9, %%r9;"
|
||
|
|
" adox %%r15, %%rbx;"
|
||
|
|
" adcx %%r10, %%r10;"
|
||
|
|
" adox %%r15, %%r13;"
|
||
|
|
" adcx %%r11, %%r11;"
|
||
|
|
" adox %%r15, %%r14;"
|
||
|
|
" adcx %%rbx, %%rbx;"
|
||
|
|
" adcx %%r13, %%r13;"
|
||
|
|
" adcx %%r14, %%r14;"
|
||
|
|
|
||
|
|
/* Step 3: Compute intermediate squares */
|
||
|
|
" movq 0(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[0]^2 */
|
||
|
|
" movq %%rax, 0(%1);"
|
||
|
|
" add %%rcx, %%r8;"
|
||
|
|
" movq %%r8, 8(%1);"
|
||
|
|
" movq 8(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[1]^2 */
|
||
|
|
" adcx %%rax, %%r9;"
|
||
|
|
" movq %%r9, 16(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 24(%1);"
|
||
|
|
" movq 16(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[2]^2 */
|
||
|
|
" adcx %%rax, %%r11;"
|
||
|
|
" movq %%r11, 32(%1);"
|
||
|
|
" adcx %%rcx, %%rbx;"
|
||
|
|
" movq %%rbx, 40(%1);"
|
||
|
|
" movq 24(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[3]^2 */
|
||
|
|
" adcx %%rax, %%r13;"
|
||
|
|
" movq %%r13, 48(%1);"
|
||
|
|
" adcx %%rcx, %%r14;"
|
||
|
|
" movq %%r14, 56(%1);"
|
||
|
|
|
||
|
|
/* Line up pointers */
|
||
|
|
" mov %1, %0;"
|
||
|
|
" mov %2, %1;"
|
||
|
|
|
||
|
|
/* Wrap the result back into the field */
|
||
|
|
|
||
|
|
/* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */
|
||
|
|
" mov $38, %%rdx;"
|
||
|
|
" mulxq 32(%0), %%r8, %%r13;"
|
||
|
|
" xor %%ecx, %%ecx;"
|
||
|
|
" adoxq 0(%0), %%r8;"
|
||
|
|
" mulxq 40(%0), %%r9, %%rbx;"
|
||
|
|
" adcx %%r13, %%r9;"
|
||
|
|
" adoxq 8(%0), %%r9;"
|
||
|
|
" mulxq 48(%0), %%r10, %%r13;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" adoxq 16(%0), %%r10;"
|
||
|
|
" mulxq 56(%0), %%r11, %%rax;"
|
||
|
|
" adcx %%r13, %%r11;"
|
||
|
|
" adoxq 24(%0), %%r11;"
|
||
|
|
" adcx %%rcx, %%rax;"
|
||
|
|
" adox %%rcx, %%rax;"
|
||
|
|
" imul %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Step 2: Fold the carry back into dst */
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" adcx %%rcx, %%r9;"
|
||
|
|
" movq %%r9, 8(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 16(%1);"
|
||
|
|
" adcx %%rcx, %%r11;"
|
||
|
|
" movq %%r11, 24(%1);"
|
||
|
|
|
||
|
|
/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" cmovc %%rdx, %%rax;"
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" movq %%r8, 0(%1);"
|
||
|
|
: "+&r"(f), "+&r"(tmp)
|
||
|
|
: "r"(out)
|
||
|
|
: "%rax", "%rbx", "%rcx", "%rdx", "%r8", "%r9", "%r10", "%r11",
|
||
|
|
"%r13", "%r14", "%r15", "memory", "cc");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Computes two field squarings:
|
||
|
|
* out[0] <- f[0] * f[0]
|
||
|
|
* out[1] <- f[1] * f[1]
|
||
|
|
* Uses the 16-element buffer tmp for intermediate results */
|
||
|
|
static inline void fsqr2(u64 *out, const u64 *f, u64 *tmp)
|
||
|
|
{
|
||
|
|
asm volatile(
|
||
|
|
/* Step 1: Compute all partial products */
|
||
|
|
" movq 0(%0), %%rdx;" /* f[0] */
|
||
|
|
" mulxq 8(%0), %%r8, %%r14;"
|
||
|
|
" xor %%r15d, %%r15d;" /* f[1]*f[0] */
|
||
|
|
" mulxq 16(%0), %%r9, %%r10;"
|
||
|
|
" adcx %%r14, %%r9;" /* f[2]*f[0] */
|
||
|
|
" mulxq 24(%0), %%rax, %%rcx;"
|
||
|
|
" adcx %%rax, %%r10;" /* f[3]*f[0] */
|
||
|
|
" movq 24(%0), %%rdx;" /* f[3] */
|
||
|
|
" mulxq 8(%0), %%r11, %%rbx;"
|
||
|
|
" adcx %%rcx, %%r11;" /* f[1]*f[3] */
|
||
|
|
" mulxq 16(%0), %%rax, %%r13;"
|
||
|
|
" adcx %%rax, %%rbx;" /* f[2]*f[3] */
|
||
|
|
" movq 8(%0), %%rdx;"
|
||
|
|
" adcx %%r15, %%r13;" /* f1 */
|
||
|
|
" mulxq 16(%0), %%rax, %%rcx;"
|
||
|
|
" mov $0, %%r14;" /* f[2]*f[1] */
|
||
|
|
|
||
|
|
/* Step 2: Compute two parallel carry chains */
|
||
|
|
" xor %%r15d, %%r15d;"
|
||
|
|
" adox %%rax, %%r10;"
|
||
|
|
" adcx %%r8, %%r8;"
|
||
|
|
" adox %%rcx, %%r11;"
|
||
|
|
" adcx %%r9, %%r9;"
|
||
|
|
" adox %%r15, %%rbx;"
|
||
|
|
" adcx %%r10, %%r10;"
|
||
|
|
" adox %%r15, %%r13;"
|
||
|
|
" adcx %%r11, %%r11;"
|
||
|
|
" adox %%r15, %%r14;"
|
||
|
|
" adcx %%rbx, %%rbx;"
|
||
|
|
" adcx %%r13, %%r13;"
|
||
|
|
" adcx %%r14, %%r14;"
|
||
|
|
|
||
|
|
/* Step 3: Compute intermediate squares */
|
||
|
|
" movq 0(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[0]^2 */
|
||
|
|
" movq %%rax, 0(%1);"
|
||
|
|
" add %%rcx, %%r8;"
|
||
|
|
" movq %%r8, 8(%1);"
|
||
|
|
" movq 8(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[1]^2 */
|
||
|
|
" adcx %%rax, %%r9;"
|
||
|
|
" movq %%r9, 16(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 24(%1);"
|
||
|
|
" movq 16(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[2]^2 */
|
||
|
|
" adcx %%rax, %%r11;"
|
||
|
|
" movq %%r11, 32(%1);"
|
||
|
|
" adcx %%rcx, %%rbx;"
|
||
|
|
" movq %%rbx, 40(%1);"
|
||
|
|
" movq 24(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[3]^2 */
|
||
|
|
" adcx %%rax, %%r13;"
|
||
|
|
" movq %%r13, 48(%1);"
|
||
|
|
" adcx %%rcx, %%r14;"
|
||
|
|
" movq %%r14, 56(%1);"
|
||
|
|
|
||
|
|
/* Step 1: Compute all partial products */
|
||
|
|
" movq 32(%0), %%rdx;" /* f[0] */
|
||
|
|
" mulxq 40(%0), %%r8, %%r14;"
|
||
|
|
" xor %%r15d, %%r15d;" /* f[1]*f[0] */
|
||
|
|
" mulxq 48(%0), %%r9, %%r10;"
|
||
|
|
" adcx %%r14, %%r9;" /* f[2]*f[0] */
|
||
|
|
" mulxq 56(%0), %%rax, %%rcx;"
|
||
|
|
" adcx %%rax, %%r10;" /* f[3]*f[0] */
|
||
|
|
" movq 56(%0), %%rdx;" /* f[3] */
|
||
|
|
" mulxq 40(%0), %%r11, %%rbx;"
|
||
|
|
" adcx %%rcx, %%r11;" /* f[1]*f[3] */
|
||
|
|
" mulxq 48(%0), %%rax, %%r13;"
|
||
|
|
" adcx %%rax, %%rbx;" /* f[2]*f[3] */
|
||
|
|
" movq 40(%0), %%rdx;"
|
||
|
|
" adcx %%r15, %%r13;" /* f1 */
|
||
|
|
" mulxq 48(%0), %%rax, %%rcx;"
|
||
|
|
" mov $0, %%r14;" /* f[2]*f[1] */
|
||
|
|
|
||
|
|
/* Step 2: Compute two parallel carry chains */
|
||
|
|
" xor %%r15d, %%r15d;"
|
||
|
|
" adox %%rax, %%r10;"
|
||
|
|
" adcx %%r8, %%r8;"
|
||
|
|
" adox %%rcx, %%r11;"
|
||
|
|
" adcx %%r9, %%r9;"
|
||
|
|
" adox %%r15, %%rbx;"
|
||
|
|
" adcx %%r10, %%r10;"
|
||
|
|
" adox %%r15, %%r13;"
|
||
|
|
" adcx %%r11, %%r11;"
|
||
|
|
" adox %%r15, %%r14;"
|
||
|
|
" adcx %%rbx, %%rbx;"
|
||
|
|
" adcx %%r13, %%r13;"
|
||
|
|
" adcx %%r14, %%r14;"
|
||
|
|
|
||
|
|
/* Step 3: Compute intermediate squares */
|
||
|
|
" movq 32(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[0]^2 */
|
||
|
|
" movq %%rax, 64(%1);"
|
||
|
|
" add %%rcx, %%r8;"
|
||
|
|
" movq %%r8, 72(%1);"
|
||
|
|
" movq 40(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[1]^2 */
|
||
|
|
" adcx %%rax, %%r9;"
|
||
|
|
" movq %%r9, 80(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 88(%1);"
|
||
|
|
" movq 48(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[2]^2 */
|
||
|
|
" adcx %%rax, %%r11;"
|
||
|
|
" movq %%r11, 96(%1);"
|
||
|
|
" adcx %%rcx, %%rbx;"
|
||
|
|
" movq %%rbx, 104(%1);"
|
||
|
|
" movq 56(%0), %%rdx;"
|
||
|
|
" mulx %%rdx, %%rax, %%rcx;" /* f[3]^2 */
|
||
|
|
" adcx %%rax, %%r13;"
|
||
|
|
" movq %%r13, 112(%1);"
|
||
|
|
" adcx %%rcx, %%r14;"
|
||
|
|
" movq %%r14, 120(%1);"
|
||
|
|
|
||
|
|
/* Line up pointers */
|
||
|
|
" mov %1, %0;"
|
||
|
|
" mov %2, %1;"
|
||
|
|
|
||
|
|
/* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */
|
||
|
|
" mov $38, %%rdx;"
|
||
|
|
" mulxq 32(%0), %%r8, %%r13;"
|
||
|
|
" xor %%ecx, %%ecx;"
|
||
|
|
" adoxq 0(%0), %%r8;"
|
||
|
|
" mulxq 40(%0), %%r9, %%rbx;"
|
||
|
|
" adcx %%r13, %%r9;"
|
||
|
|
" adoxq 8(%0), %%r9;"
|
||
|
|
" mulxq 48(%0), %%r10, %%r13;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" adoxq 16(%0), %%r10;"
|
||
|
|
" mulxq 56(%0), %%r11, %%rax;"
|
||
|
|
" adcx %%r13, %%r11;"
|
||
|
|
" adoxq 24(%0), %%r11;"
|
||
|
|
" adcx %%rcx, %%rax;"
|
||
|
|
" adox %%rcx, %%rax;"
|
||
|
|
" imul %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Step 2: Fold the carry back into dst */
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" adcx %%rcx, %%r9;"
|
||
|
|
" movq %%r9, 8(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 16(%1);"
|
||
|
|
" adcx %%rcx, %%r11;"
|
||
|
|
" movq %%r11, 24(%1);"
|
||
|
|
|
||
|
|
/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" cmovc %%rdx, %%rax;"
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" movq %%r8, 0(%1);"
|
||
|
|
|
||
|
|
/* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */
|
||
|
|
" mov $38, %%rdx;"
|
||
|
|
" mulxq 96(%0), %%r8, %%r13;"
|
||
|
|
" xor %%ecx, %%ecx;"
|
||
|
|
" adoxq 64(%0), %%r8;"
|
||
|
|
" mulxq 104(%0), %%r9, %%rbx;"
|
||
|
|
" adcx %%r13, %%r9;"
|
||
|
|
" adoxq 72(%0), %%r9;"
|
||
|
|
" mulxq 112(%0), %%r10, %%r13;"
|
||
|
|
" adcx %%rbx, %%r10;"
|
||
|
|
" adoxq 80(%0), %%r10;"
|
||
|
|
" mulxq 120(%0), %%r11, %%rax;"
|
||
|
|
" adcx %%r13, %%r11;"
|
||
|
|
" adoxq 88(%0), %%r11;"
|
||
|
|
" adcx %%rcx, %%rax;"
|
||
|
|
" adox %%rcx, %%rax;"
|
||
|
|
" imul %%rdx, %%rax;"
|
||
|
|
|
||
|
|
/* Step 2: Fold the carry back into dst */
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" adcx %%rcx, %%r9;"
|
||
|
|
" movq %%r9, 40(%1);"
|
||
|
|
" adcx %%rcx, %%r10;"
|
||
|
|
" movq %%r10, 48(%1);"
|
||
|
|
" adcx %%rcx, %%r11;"
|
||
|
|
" movq %%r11, 56(%1);"
|
||
|
|
|
||
|
|
/* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */
|
||
|
|
" mov $0, %%rax;"
|
||
|
|
" cmovc %%rdx, %%rax;"
|
||
|
|
" add %%rax, %%r8;"
|
||
|
|
" movq %%r8, 32(%1);"
|
||
|
|
: "+&r"(f), "+&r"(tmp)
|
||
|
|
: "r"(out)
|
||
|
|
: "%rax", "%rbx", "%rcx", "%rdx", "%r8", "%r9", "%r10", "%r11",
|
||
|
|
"%r13", "%r14", "%r15", "memory", "cc");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void point_add_and_double(u64 *q, u64 *p01_tmp1, u64 *tmp2)
|
||
|
|
{
|
||
|
|
u64 *nq = p01_tmp1;
|
||
|
|
u64 *nq_p1 = p01_tmp1 + (u32)8U;
|
||
|
|
u64 *tmp1 = p01_tmp1 + (u32)16U;
|
||
|
|
u64 *x1 = q;
|
||
|
|
u64 *x2 = nq;
|
||
|
|
u64 *z2 = nq + (u32)4U;
|
||
|
|
u64 *z3 = nq_p1 + (u32)4U;
|
||
|
|
u64 *a = tmp1;
|
||
|
|
u64 *b = tmp1 + (u32)4U;
|
||
|
|
u64 *ab = tmp1;
|
||
|
|
u64 *dc = tmp1 + (u32)8U;
|
||
|
|
u64 *x3;
|
||
|
|
u64 *z31;
|
||
|
|
u64 *d0;
|
||
|
|
u64 *c0;
|
||
|
|
u64 *a1;
|
||
|
|
u64 *b1;
|
||
|
|
u64 *d;
|
||
|
|
u64 *c;
|
||
|
|
u64 *ab1;
|
||
|
|
u64 *dc1;
|
||
|
|
fadd(a, x2, z2);
|
||
|
|
fsub(b, x2, z2);
|
||
|
|
x3 = nq_p1;
|
||
|
|
z31 = nq_p1 + (u32)4U;
|
||
|
|
d0 = dc;
|
||
|
|
c0 = dc + (u32)4U;
|
||
|
|
fadd(c0, x3, z31);
|
||
|
|
fsub(d0, x3, z31);
|
||
|
|
fmul2(dc, dc, ab, tmp2);
|
||
|
|
fadd(x3, d0, c0);
|
||
|
|
fsub(z31, d0, c0);
|
||
|
|
a1 = tmp1;
|
||
|
|
b1 = tmp1 + (u32)4U;
|
||
|
|
d = tmp1 + (u32)8U;
|
||
|
|
c = tmp1 + (u32)12U;
|
||
|
|
ab1 = tmp1;
|
||
|
|
dc1 = tmp1 + (u32)8U;
|
||
|
|
fsqr2(dc1, ab1, tmp2);
|
||
|
|
fsqr2(nq_p1, nq_p1, tmp2);
|
||
|
|
a1[0U] = c[0U];
|
||
|
|
a1[1U] = c[1U];
|
||
|
|
a1[2U] = c[2U];
|
||
|
|
a1[3U] = c[3U];
|
||
|
|
fsub(c, d, c);
|
||
|
|
fmul_scalar(b1, c, (u64)121665U);
|
||
|
|
fadd(b1, b1, d);
|
||
|
|
fmul2(nq, dc1, ab1, tmp2);
|
||
|
|
fmul(z3, z3, x1, tmp2);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void point_double(u64 *nq, u64 *tmp1, u64 *tmp2)
|
||
|
|
{
|
||
|
|
u64 *x2 = nq;
|
||
|
|
u64 *z2 = nq + (u32)4U;
|
||
|
|
u64 *a = tmp1;
|
||
|
|
u64 *b = tmp1 + (u32)4U;
|
||
|
|
u64 *d = tmp1 + (u32)8U;
|
||
|
|
u64 *c = tmp1 + (u32)12U;
|
||
|
|
u64 *ab = tmp1;
|
||
|
|
u64 *dc = tmp1 + (u32)8U;
|
||
|
|
fadd(a, x2, z2);
|
||
|
|
fsub(b, x2, z2);
|
||
|
|
fsqr2(dc, ab, tmp2);
|
||
|
|
a[0U] = c[0U];
|
||
|
|
a[1U] = c[1U];
|
||
|
|
a[2U] = c[2U];
|
||
|
|
a[3U] = c[3U];
|
||
|
|
fsub(c, d, c);
|
||
|
|
fmul_scalar(b, c, (u64)121665U);
|
||
|
|
fadd(b, b, d);
|
||
|
|
fmul2(nq, dc, ab, tmp2);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void montgomery_ladder(u64 *out, const u8 *key, u64 *init1)
|
||
|
|
{
|
||
|
|
u64 tmp2[16U] = { 0U };
|
||
|
|
u64 p01_tmp1_swap[33U] = { 0U };
|
||
|
|
u64 *p0 = p01_tmp1_swap;
|
||
|
|
u64 *p01 = p01_tmp1_swap;
|
||
|
|
u64 *p03 = p01;
|
||
|
|
u64 *p11 = p01 + (u32)8U;
|
||
|
|
u64 *x0;
|
||
|
|
u64 *z0;
|
||
|
|
u64 *p01_tmp1;
|
||
|
|
u64 *p01_tmp11;
|
||
|
|
u64 *nq10;
|
||
|
|
u64 *nq_p11;
|
||
|
|
u64 *swap1;
|
||
|
|
u64 sw0;
|
||
|
|
u64 *nq1;
|
||
|
|
u64 *tmp1;
|
||
|
|
memcpy(p11, init1, (u32)8U * sizeof(init1[0U]));
|
||
|
|
x0 = p03;
|
||
|
|
z0 = p03 + (u32)4U;
|
||
|
|
x0[0U] = (u64)1U;
|
||
|
|
x0[1U] = (u64)0U;
|
||
|
|
x0[2U] = (u64)0U;
|
||
|
|
x0[3U] = (u64)0U;
|
||
|
|
z0[0U] = (u64)0U;
|
||
|
|
z0[1U] = (u64)0U;
|
||
|
|
z0[2U] = (u64)0U;
|
||
|
|
z0[3U] = (u64)0U;
|
||
|
|
p01_tmp1 = p01_tmp1_swap;
|
||
|
|
p01_tmp11 = p01_tmp1_swap;
|
||
|
|
nq10 = p01_tmp1_swap;
|
||
|
|
nq_p11 = p01_tmp1_swap + (u32)8U;
|
||
|
|
swap1 = p01_tmp1_swap + (u32)32U;
|
||
|
|
cswap2((u64)1U, nq10, nq_p11);
|
||
|
|
point_add_and_double(init1, p01_tmp11, tmp2);
|
||
|
|
swap1[0U] = (u64)1U;
|
||
|
|
{
|
||
|
|
u32 i;
|
||
|
|
for (i = (u32)0U; i < (u32)251U; i = i + (u32)1U) {
|
||
|
|
u64 *p01_tmp12 = p01_tmp1_swap;
|
||
|
|
u64 *swap2 = p01_tmp1_swap + (u32)32U;
|
||
|
|
u64 *nq2 = p01_tmp12;
|
||
|
|
u64 *nq_p12 = p01_tmp12 + (u32)8U;
|
||
|
|
u64 bit = (u64)(key[((u32)253U - i) / (u32)8U] >> ((u32)253U - i) % (u32)8U & (u8)1U);
|
||
|
|
u64 sw = swap2[0U] ^ bit;
|
||
|
|
cswap2(sw, nq2, nq_p12);
|
||
|
|
point_add_and_double(init1, p01_tmp12, tmp2);
|
||
|
|
swap2[0U] = bit;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
sw0 = swap1[0U];
|
||
|
|
cswap2(sw0, nq10, nq_p11);
|
||
|
|
nq1 = p01_tmp1;
|
||
|
|
tmp1 = p01_tmp1 + (u32)16U;
|
||
|
|
point_double(nq1, tmp1, tmp2);
|
||
|
|
point_double(nq1, tmp1, tmp2);
|
||
|
|
point_double(nq1, tmp1, tmp2);
|
||
|
|
memcpy(out, p0, (u32)8U * sizeof(p0[0U]));
|
||
|
|
|
||
|
|
memzero_explicit(tmp2, sizeof(tmp2));
|
||
|
|
memzero_explicit(p01_tmp1_swap, sizeof(p01_tmp1_swap));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fsquare_times(u64 *o, const u64 *inp, u64 *tmp, u32 n1)
|
||
|
|
{
|
||
|
|
u32 i;
|
||
|
|
fsqr(o, inp, tmp);
|
||
|
|
for (i = (u32)0U; i < n1 - (u32)1U; i = i + (u32)1U)
|
||
|
|
fsqr(o, o, tmp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void finv(u64 *o, const u64 *i, u64 *tmp)
|
||
|
|
{
|
||
|
|
u64 t1[16U] = { 0U };
|
||
|
|
u64 *a0 = t1;
|
||
|
|
u64 *b = t1 + (u32)4U;
|
||
|
|
u64 *c = t1 + (u32)8U;
|
||
|
|
u64 *t00 = t1 + (u32)12U;
|
||
|
|
u64 *tmp1 = tmp;
|
||
|
|
u64 *a;
|
||
|
|
u64 *t0;
|
||
|
|
fsquare_times(a0, i, tmp1, (u32)1U);
|
||
|
|
fsquare_times(t00, a0, tmp1, (u32)2U);
|
||
|
|
fmul(b, t00, i, tmp);
|
||
|
|
fmul(a0, b, a0, tmp);
|
||
|
|
fsquare_times(t00, a0, tmp1, (u32)1U);
|
||
|
|
fmul(b, t00, b, tmp);
|
||
|
|
fsquare_times(t00, b, tmp1, (u32)5U);
|
||
|
|
fmul(b, t00, b, tmp);
|
||
|
|
fsquare_times(t00, b, tmp1, (u32)10U);
|
||
|
|
fmul(c, t00, b, tmp);
|
||
|
|
fsquare_times(t00, c, tmp1, (u32)20U);
|
||
|
|
fmul(t00, t00, c, tmp);
|
||
|
|
fsquare_times(t00, t00, tmp1, (u32)10U);
|
||
|
|
fmul(b, t00, b, tmp);
|
||
|
|
fsquare_times(t00, b, tmp1, (u32)50U);
|
||
|
|
fmul(c, t00, b, tmp);
|
||
|
|
fsquare_times(t00, c, tmp1, (u32)100U);
|
||
|
|
fmul(t00, t00, c, tmp);
|
||
|
|
fsquare_times(t00, t00, tmp1, (u32)50U);
|
||
|
|
fmul(t00, t00, b, tmp);
|
||
|
|
fsquare_times(t00, t00, tmp1, (u32)5U);
|
||
|
|
a = t1;
|
||
|
|
t0 = t1 + (u32)12U;
|
||
|
|
fmul(o, t0, a, tmp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void store_felem(u64 *b, u64 *f)
|
||
|
|
{
|
||
|
|
u64 f30 = f[3U];
|
||
|
|
u64 top_bit0 = f30 >> (u32)63U;
|
||
|
|
u64 f31;
|
||
|
|
u64 top_bit;
|
||
|
|
u64 f0;
|
||
|
|
u64 f1;
|
||
|
|
u64 f2;
|
||
|
|
u64 f3;
|
||
|
|
u64 m0;
|
||
|
|
u64 m1;
|
||
|
|
u64 m2;
|
||
|
|
u64 m3;
|
||
|
|
u64 mask;
|
||
|
|
u64 f0_;
|
||
|
|
u64 f1_;
|
||
|
|
u64 f2_;
|
||
|
|
u64 f3_;
|
||
|
|
u64 o0;
|
||
|
|
u64 o1;
|
||
|
|
u64 o2;
|
||
|
|
u64 o3;
|
||
|
|
f[3U] = f30 & (u64)0x7fffffffffffffffU;
|
||
|
|
add_scalar(f, f, (u64)19U * top_bit0);
|
||
|
|
f31 = f[3U];
|
||
|
|
top_bit = f31 >> (u32)63U;
|
||
|
|
f[3U] = f31 & (u64)0x7fffffffffffffffU;
|
||
|
|
add_scalar(f, f, (u64)19U * top_bit);
|
||
|
|
f0 = f[0U];
|
||
|
|
f1 = f[1U];
|
||
|
|
f2 = f[2U];
|
||
|
|
f3 = f[3U];
|
||
|
|
m0 = gte_mask(f0, (u64)0xffffffffffffffedU);
|
||
|
|
m1 = eq_mask(f1, (u64)0xffffffffffffffffU);
|
||
|
|
m2 = eq_mask(f2, (u64)0xffffffffffffffffU);
|
||
|
|
m3 = eq_mask(f3, (u64)0x7fffffffffffffffU);
|
||
|
|
mask = ((m0 & m1) & m2) & m3;
|
||
|
|
f0_ = f0 - (mask & (u64)0xffffffffffffffedU);
|
||
|
|
f1_ = f1 - (mask & (u64)0xffffffffffffffffU);
|
||
|
|
f2_ = f2 - (mask & (u64)0xffffffffffffffffU);
|
||
|
|
f3_ = f3 - (mask & (u64)0x7fffffffffffffffU);
|
||
|
|
o0 = f0_;
|
||
|
|
o1 = f1_;
|
||
|
|
o2 = f2_;
|
||
|
|
o3 = f3_;
|
||
|
|
b[0U] = o0;
|
||
|
|
b[1U] = o1;
|
||
|
|
b[2U] = o2;
|
||
|
|
b[3U] = o3;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void encode_point(u8 *o, const u64 *i)
|
||
|
|
{
|
||
|
|
const u64 *x = i;
|
||
|
|
const u64 *z = i + (u32)4U;
|
||
|
|
u64 tmp[4U] = { 0U };
|
||
|
|
u64 tmp_w[16U] = { 0U };
|
||
|
|
finv(tmp, z, tmp_w);
|
||
|
|
fmul(tmp, tmp, x, tmp_w);
|
||
|
|
store_felem((u64 *)o, tmp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void curve25519_ever64(u8 *out, const u8 *priv, const u8 *pub)
|
||
|
|
{
|
||
|
|
u64 init1[8U] = { 0U };
|
||
|
|
u64 tmp[4U] = { 0U };
|
||
|
|
u64 tmp3;
|
||
|
|
u64 *x;
|
||
|
|
u64 *z;
|
||
|
|
{
|
||
|
|
u32 i;
|
||
|
|
for (i = (u32)0U; i < (u32)4U; i = i + (u32)1U) {
|
||
|
|
u64 *os = tmp;
|
||
|
|
const u8 *bj = pub + i * (u32)8U;
|
||
|
|
u64 u = *(u64 *)bj;
|
||
|
|
u64 r = u;
|
||
|
|
u64 x0 = r;
|
||
|
|
os[i] = x0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
tmp3 = tmp[3U];
|
||
|
|
tmp[3U] = tmp3 & (u64)0x7fffffffffffffffU;
|
||
|
|
x = init1;
|
||
|
|
z = init1 + (u32)4U;
|
||
|
|
z[0U] = (u64)1U;
|
||
|
|
z[1U] = (u64)0U;
|
||
|
|
z[2U] = (u64)0U;
|
||
|
|
z[3U] = (u64)0U;
|
||
|
|
x[0U] = tmp[0U];
|
||
|
|
x[1U] = tmp[1U];
|
||
|
|
x[2U] = tmp[2U];
|
||
|
|
x[3U] = tmp[3U];
|
||
|
|
montgomery_ladder(init1, priv, init1);
|
||
|
|
encode_point(out, init1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* The below constants were generated using this sage script:
|
||
|
|
*
|
||
|
|
* #!/usr/bin/env sage
|
||
|
|
* import sys
|
||
|
|
* from sage.all import *
|
||
|
|
* def limbs(n):
|
||
|
|
* n = int(n)
|
||
|
|
* l = ((n >> 0) % 2^64, (n >> 64) % 2^64, (n >> 128) % 2^64, (n >> 192) % 2^64)
|
||
|
|
* return "0x%016xULL, 0x%016xULL, 0x%016xULL, 0x%016xULL" % l
|
||
|
|
* ec = EllipticCurve(GF(2^255 - 19), [0, 486662, 0, 1, 0])
|
||
|
|
* p_minus_s = (ec.lift_x(9) - ec.lift_x(1))[0]
|
||
|
|
* print("static const u64 p_minus_s[] = { %s };\n" % limbs(p_minus_s))
|
||
|
|
* print("static const u64 table_ladder[] = {")
|
||
|
|
* p = ec.lift_x(9)
|
||
|
|
* for i in range(252):
|
||
|
|
* l = (p[0] + p[2]) / (p[0] - p[2])
|
||
|
|
* print(("\t%s" + ("," if i != 251 else "")) % limbs(l))
|
||
|
|
* p = p * 2
|
||
|
|
* print("};")
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
static const u64 p_minus_s[] = { 0x816b1e0137d48290ULL, 0x440f6a51eb4d1207ULL, 0x52385f46dca2b71dULL, 0x215132111d8354cbULL };
|
||
|
|
|
||
|
|
static const u64 table_ladder[] = {
|
||
|
|
0xfffffffffffffff3ULL, 0xffffffffffffffffULL, 0xffffffffffffffffULL, 0x5fffffffffffffffULL,
|
||
|
|
0x6b8220f416aafe96ULL, 0x82ebeb2b4f566a34ULL, 0xd5a9a5b075a5950fULL, 0x5142b2cf4b2488f4ULL,
|
||
|
|
0x6aaebc750069680cULL, 0x89cf7820a0f99c41ULL, 0x2a58d9183b56d0f4ULL, 0x4b5aca80e36011a4ULL,
|
||
|
|
0x329132348c29745dULL, 0xf4a2e616e1642fd7ULL, 0x1e45bb03ff67bc34ULL, 0x306912d0f42a9b4aULL,
|
||
|
|
0xff886507e6af7154ULL, 0x04f50e13dfeec82fULL, 0xaa512fe82abab5ceULL, 0x174e251a68d5f222ULL,
|
||
|
|
0xcf96700d82028898ULL, 0x1743e3370a2c02c5ULL, 0x379eec98b4e86eaaULL, 0x0c59888a51e0482eULL,
|
||
|
|
0xfbcbf1d699b5d189ULL, 0xacaef0d58e9fdc84ULL, 0xc1c20d06231f7614ULL, 0x2938218da274f972ULL,
|
||
|
|
0xf6af49beff1d7f18ULL, 0xcc541c22387ac9c2ULL, 0x96fcc9ef4015c56bULL, 0x69c1627c690913a9ULL,
|
||
|
|
0x7a86fd2f4733db0eULL, 0xfdb8c4f29e087de9ULL, 0x095e4b1a8ea2a229ULL, 0x1ad7a7c829b37a79ULL,
|
||
|
|
0x342d89cad17ea0c0ULL, 0x67bedda6cced2051ULL, 0x19ca31bf2bb42f74ULL, 0x3df7b4c84980acbbULL,
|
||
|
|
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|
|
0xd7c46dc1a4edb1c9ULL, 0x5514d7b6437fd98aULL, 0x58942f6bb2a1c00bULL, 0x2dffb2ab1d70710eULL,
|
||
|
|
0xccdfcf2fc18b6d68ULL, 0xa8ebcba8b7806167ULL, 0x980697f95e2937e3ULL, 0x02fbba1cd0126e8cULL
|
||
|
|
};
|
||
|
|
|
||
|
|
static void curve25519_ever64_base(u8 *out, const u8 *priv)
|
||
|
|
{
|
||
|
|
u64 swap = 1;
|
||
|
|
int i, j, k;
|
||
|
|
u64 tmp[16 + 32 + 4];
|
||
|
|
u64 *x1 = &tmp[0];
|
||
|
|
u64 *z1 = &tmp[4];
|
||
|
|
u64 *x2 = &tmp[8];
|
||
|
|
u64 *z2 = &tmp[12];
|
||
|
|
u64 *xz1 = &tmp[0];
|
||
|
|
u64 *xz2 = &tmp[8];
|
||
|
|
u64 *a = &tmp[0 + 16];
|
||
|
|
u64 *b = &tmp[4 + 16];
|
||
|
|
u64 *c = &tmp[8 + 16];
|
||
|
|
u64 *ab = &tmp[0 + 16];
|
||
|
|
u64 *abcd = &tmp[0 + 16];
|
||
|
|
u64 *ef = &tmp[16 + 16];
|
||
|
|
u64 *efgh = &tmp[16 + 16];
|
||
|
|
u64 *key = &tmp[0 + 16 + 32];
|
||
|
|
|
||
|
|
memcpy(key, priv, 32);
|
||
|
|
((u8 *)key)[0] &= 248;
|
||
|
|
((u8 *)key)[31] = (((u8 *)key)[31] & 127) | 64;
|
||
|
|
|
||
|
|
x1[0] = 1, x1[1] = x1[2] = x1[3] = 0;
|
||
|
|
z1[0] = 1, z1[1] = z1[2] = z1[3] = 0;
|
||
|
|
z2[0] = 1, z2[1] = z2[2] = z2[3] = 0;
|
||
|
|
memcpy(x2, p_minus_s, sizeof(p_minus_s));
|
||
|
|
|
||
|
|
j = 3;
|
||
|
|
for (i = 0; i < 4; ++i) {
|
||
|
|
while (j < (const int[]){ 64, 64, 64, 63 }[i]) {
|
||
|
|
u64 bit = (key[i] >> j) & 1;
|
||
|
|
k = (64 * i + j - 3);
|
||
|
|
swap = swap ^ bit;
|
||
|
|
cswap2(swap, xz1, xz2);
|
||
|
|
swap = bit;
|
||
|
|
fsub(b, x1, z1);
|
||
|
|
fadd(a, x1, z1);
|
||
|
|
fmul(c, &table_ladder[4 * k], b, ef);
|
||
|
|
fsub(b, a, c);
|
||
|
|
fadd(a, a, c);
|
||
|
|
fsqr2(ab, ab, efgh);
|
||
|
|
fmul2(xz1, xz2, ab, efgh);
|
||
|
|
++j;
|
||
|
|
}
|
||
|
|
j = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
point_double(xz1, abcd, efgh);
|
||
|
|
point_double(xz1, abcd, efgh);
|
||
|
|
point_double(xz1, abcd, efgh);
|
||
|
|
encode_point(out, xz1);
|
||
|
|
|
||
|
|
memzero_explicit(tmp, sizeof(tmp));
|
||
|
|
}
|
||
|
|
|
||
|
|
static __ro_after_init DEFINE_STATIC_KEY_FALSE(curve25519_use_bmi2_adx);
|
||
|
|
|
||
|
|
void curve25519_arch(u8 mypublic[CURVE25519_KEY_SIZE],
|
||
|
|
const u8 secret[CURVE25519_KEY_SIZE],
|
||
|
|
const u8 basepoint[CURVE25519_KEY_SIZE])
|
||
|
|
{
|
||
|
|
if (static_branch_likely(&curve25519_use_bmi2_adx))
|
||
|
|
curve25519_ever64(mypublic, secret, basepoint);
|
||
|
|
else
|
||
|
|
curve25519_generic(mypublic, secret, basepoint);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(curve25519_arch);
|
||
|
|
|
||
|
|
void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
|
||
|
|
const u8 secret[CURVE25519_KEY_SIZE])
|
||
|
|
{
|
||
|
|
if (static_branch_likely(&curve25519_use_bmi2_adx))
|
||
|
|
curve25519_ever64_base(pub, secret);
|
||
|
|
else
|
||
|
|
curve25519_generic(pub, secret, curve25519_base_point);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(curve25519_base_arch);
|
||
|
|
|
||
|
|
static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf,
|
||
|
|
unsigned int len)
|
||
|
|
{
|
||
|
|
u8 *secret = kpp_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
if (!len)
|
||
|
|
curve25519_generate_secret(secret);
|
||
|
|
else if (len == CURVE25519_KEY_SIZE &&
|
||
|
|
crypto_memneq(buf, curve25519_null_point, CURVE25519_KEY_SIZE))
|
||
|
|
memcpy(secret, buf, CURVE25519_KEY_SIZE);
|
||
|
|
else
|
||
|
|
return -EINVAL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int curve25519_generate_public_key(struct kpp_request *req)
|
||
|
|
{
|
||
|
|
struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
|
||
|
|
const u8 *secret = kpp_tfm_ctx(tfm);
|
||
|
|
u8 buf[CURVE25519_KEY_SIZE];
|
||
|
|
int copied, nbytes;
|
||
|
|
|
||
|
|
if (req->src)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
curve25519_base_arch(buf, secret);
|
||
|
|
|
||
|
|
/* might want less than we've got */
|
||
|
|
nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len);
|
||
|
|
copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst,
|
||
|
|
nbytes),
|
||
|
|
buf, nbytes);
|
||
|
|
if (copied != nbytes)
|
||
|
|
return -EINVAL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int curve25519_compute_shared_secret(struct kpp_request *req)
|
||
|
|
{
|
||
|
|
struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
|
||
|
|
const u8 *secret = kpp_tfm_ctx(tfm);
|
||
|
|
u8 public_key[CURVE25519_KEY_SIZE];
|
||
|
|
u8 buf[CURVE25519_KEY_SIZE];
|
||
|
|
int copied, nbytes;
|
||
|
|
|
||
|
|
if (!req->src)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
copied = sg_copy_to_buffer(req->src,
|
||
|
|
sg_nents_for_len(req->src,
|
||
|
|
CURVE25519_KEY_SIZE),
|
||
|
|
public_key, CURVE25519_KEY_SIZE);
|
||
|
|
if (copied != CURVE25519_KEY_SIZE)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
curve25519_arch(buf, secret, public_key);
|
||
|
|
|
||
|
|
/* might want less than we've got */
|
||
|
|
nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len);
|
||
|
|
copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst,
|
||
|
|
nbytes),
|
||
|
|
buf, nbytes);
|
||
|
|
if (copied != nbytes)
|
||
|
|
return -EINVAL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static unsigned int curve25519_max_size(struct crypto_kpp *tfm)
|
||
|
|
{
|
||
|
|
return CURVE25519_KEY_SIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct kpp_alg curve25519_alg = {
|
||
|
|
.base.cra_name = "curve25519",
|
||
|
|
.base.cra_driver_name = "curve25519-x86",
|
||
|
|
.base.cra_priority = 200,
|
||
|
|
.base.cra_module = THIS_MODULE,
|
||
|
|
.base.cra_ctxsize = CURVE25519_KEY_SIZE,
|
||
|
|
|
||
|
|
.set_secret = curve25519_set_secret,
|
||
|
|
.generate_public_key = curve25519_generate_public_key,
|
||
|
|
.compute_shared_secret = curve25519_compute_shared_secret,
|
||
|
|
.max_size = curve25519_max_size,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
static int __init curve25519_mod_init(void)
|
||
|
|
{
|
||
|
|
if (boot_cpu_has(X86_FEATURE_BMI2) && boot_cpu_has(X86_FEATURE_ADX))
|
||
|
|
static_branch_enable(&curve25519_use_bmi2_adx);
|
||
|
|
else
|
||
|
|
return 0;
|
||
|
|
return IS_REACHABLE(CONFIG_CRYPTO_KPP) ?
|
||
|
|
crypto_register_kpp(&curve25519_alg) : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit curve25519_mod_exit(void)
|
||
|
|
{
|
||
|
|
if (IS_REACHABLE(CONFIG_CRYPTO_KPP) &&
|
||
|
|
static_branch_likely(&curve25519_use_bmi2_adx))
|
||
|
|
crypto_unregister_kpp(&curve25519_alg);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(curve25519_mod_init);
|
||
|
|
module_exit(curve25519_mod_exit);
|
||
|
|
|
||
|
|
MODULE_ALIAS_CRYPTO("curve25519");
|
||
|
|
MODULE_ALIAS_CRYPTO("curve25519-x86");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
|