274 lines
7.1 KiB
C
274 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* OpenSSL/Cryptogams accelerated Poly1305 transform for ARM
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*
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* Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*/
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#include <asm/hwcap.h>
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <asm/unaligned.h>
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#include <crypto/algapi.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/poly1305.h>
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#include <crypto/internal/simd.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/jump_label.h>
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#include <linux/module.h>
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void poly1305_init_arm(void *state, const u8 *key);
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void poly1305_blocks_arm(void *state, const u8 *src, u32 len, u32 hibit);
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void poly1305_blocks_neon(void *state, const u8 *src, u32 len, u32 hibit);
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void poly1305_emit_arm(void *state, u8 *digest, const u32 *nonce);
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void __weak poly1305_blocks_neon(void *state, const u8 *src, u32 len, u32 hibit)
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{
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}
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE])
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{
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poly1305_init_arm(&dctx->h, key);
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dctx->s[0] = get_unaligned_le32(key + 16);
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dctx->s[1] = get_unaligned_le32(key + 20);
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dctx->s[2] = get_unaligned_le32(key + 24);
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dctx->s[3] = get_unaligned_le32(key + 28);
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dctx->buflen = 0;
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}
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EXPORT_SYMBOL(poly1305_init_arch);
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static int arm_poly1305_init(struct shash_desc *desc)
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{
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
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dctx->buflen = 0;
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dctx->rset = 0;
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dctx->sset = false;
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return 0;
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}
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static void arm_poly1305_blocks(struct poly1305_desc_ctx *dctx, const u8 *src,
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u32 len, u32 hibit, bool do_neon)
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{
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if (unlikely(!dctx->sset)) {
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if (!dctx->rset) {
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poly1305_init_arm(&dctx->h, src);
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src += POLY1305_BLOCK_SIZE;
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len -= POLY1305_BLOCK_SIZE;
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dctx->rset = 1;
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}
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if (len >= POLY1305_BLOCK_SIZE) {
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dctx->s[0] = get_unaligned_le32(src + 0);
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dctx->s[1] = get_unaligned_le32(src + 4);
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dctx->s[2] = get_unaligned_le32(src + 8);
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dctx->s[3] = get_unaligned_le32(src + 12);
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src += POLY1305_BLOCK_SIZE;
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len -= POLY1305_BLOCK_SIZE;
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dctx->sset = true;
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}
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if (len < POLY1305_BLOCK_SIZE)
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return;
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}
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len &= ~(POLY1305_BLOCK_SIZE - 1);
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if (static_branch_likely(&have_neon) && likely(do_neon))
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poly1305_blocks_neon(&dctx->h, src, len, hibit);
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else
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poly1305_blocks_arm(&dctx->h, src, len, hibit);
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}
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static void arm_poly1305_do_update(struct poly1305_desc_ctx *dctx,
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const u8 *src, u32 len, bool do_neon)
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{
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if (unlikely(dctx->buflen)) {
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u32 bytes = min(len, POLY1305_BLOCK_SIZE - dctx->buflen);
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memcpy(dctx->buf + dctx->buflen, src, bytes);
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src += bytes;
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len -= bytes;
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dctx->buflen += bytes;
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if (dctx->buflen == POLY1305_BLOCK_SIZE) {
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arm_poly1305_blocks(dctx, dctx->buf,
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POLY1305_BLOCK_SIZE, 1, false);
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dctx->buflen = 0;
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}
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}
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if (likely(len >= POLY1305_BLOCK_SIZE)) {
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arm_poly1305_blocks(dctx, src, len, 1, do_neon);
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src += round_down(len, POLY1305_BLOCK_SIZE);
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len %= POLY1305_BLOCK_SIZE;
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}
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if (unlikely(len)) {
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dctx->buflen = len;
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memcpy(dctx->buf, src, len);
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}
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}
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static int arm_poly1305_update(struct shash_desc *desc,
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const u8 *src, unsigned int srclen)
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{
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
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arm_poly1305_do_update(dctx, src, srclen, false);
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return 0;
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}
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static int __maybe_unused arm_poly1305_update_neon(struct shash_desc *desc,
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const u8 *src,
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unsigned int srclen)
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{
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
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bool do_neon = crypto_simd_usable() && srclen > 128;
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if (static_branch_likely(&have_neon) && do_neon)
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kernel_neon_begin();
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arm_poly1305_do_update(dctx, src, srclen, do_neon);
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if (static_branch_likely(&have_neon) && do_neon)
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kernel_neon_end();
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return 0;
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}
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void poly1305_update_arch(struct poly1305_desc_ctx *dctx, const u8 *src,
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unsigned int nbytes)
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{
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bool do_neon = IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
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crypto_simd_usable();
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if (unlikely(dctx->buflen)) {
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u32 bytes = min(nbytes, POLY1305_BLOCK_SIZE - dctx->buflen);
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memcpy(dctx->buf + dctx->buflen, src, bytes);
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src += bytes;
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nbytes -= bytes;
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dctx->buflen += bytes;
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if (dctx->buflen == POLY1305_BLOCK_SIZE) {
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poly1305_blocks_arm(&dctx->h, dctx->buf,
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POLY1305_BLOCK_SIZE, 1);
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dctx->buflen = 0;
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}
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}
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if (likely(nbytes >= POLY1305_BLOCK_SIZE)) {
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unsigned int len = round_down(nbytes, POLY1305_BLOCK_SIZE);
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if (static_branch_likely(&have_neon) && do_neon) {
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do {
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unsigned int todo = min_t(unsigned int, len, SZ_4K);
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kernel_neon_begin();
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poly1305_blocks_neon(&dctx->h, src, todo, 1);
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kernel_neon_end();
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len -= todo;
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src += todo;
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} while (len);
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} else {
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poly1305_blocks_arm(&dctx->h, src, len, 1);
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src += len;
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}
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nbytes %= POLY1305_BLOCK_SIZE;
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}
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if (unlikely(nbytes)) {
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dctx->buflen = nbytes;
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memcpy(dctx->buf, src, nbytes);
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}
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}
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EXPORT_SYMBOL(poly1305_update_arch);
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void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
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{
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if (unlikely(dctx->buflen)) {
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dctx->buf[dctx->buflen++] = 1;
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memset(dctx->buf + dctx->buflen, 0,
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POLY1305_BLOCK_SIZE - dctx->buflen);
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poly1305_blocks_arm(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
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}
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poly1305_emit_arm(&dctx->h, dst, dctx->s);
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*dctx = (struct poly1305_desc_ctx){};
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}
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EXPORT_SYMBOL(poly1305_final_arch);
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static int arm_poly1305_final(struct shash_desc *desc, u8 *dst)
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{
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
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if (unlikely(!dctx->sset))
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return -ENOKEY;
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poly1305_final_arch(dctx, dst);
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return 0;
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}
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static struct shash_alg arm_poly1305_algs[] = {{
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.init = arm_poly1305_init,
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.update = arm_poly1305_update,
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.final = arm_poly1305_final,
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.digestsize = POLY1305_DIGEST_SIZE,
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.descsize = sizeof(struct poly1305_desc_ctx),
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.base.cra_name = "poly1305",
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.base.cra_driver_name = "poly1305-arm",
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.base.cra_priority = 150,
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.base.cra_blocksize = POLY1305_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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#ifdef CONFIG_KERNEL_MODE_NEON
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}, {
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.init = arm_poly1305_init,
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.update = arm_poly1305_update_neon,
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.final = arm_poly1305_final,
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.digestsize = POLY1305_DIGEST_SIZE,
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.descsize = sizeof(struct poly1305_desc_ctx),
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.base.cra_name = "poly1305",
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.base.cra_driver_name = "poly1305-neon",
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.base.cra_priority = 200,
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.base.cra_blocksize = POLY1305_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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#endif
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}};
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static int __init arm_poly1305_mod_init(void)
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{
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if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
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(elf_hwcap & HWCAP_NEON))
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static_branch_enable(&have_neon);
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else if (IS_REACHABLE(CONFIG_CRYPTO_HASH))
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/* register only the first entry */
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return crypto_register_shash(&arm_poly1305_algs[0]);
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return IS_REACHABLE(CONFIG_CRYPTO_HASH) ?
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crypto_register_shashes(arm_poly1305_algs,
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ARRAY_SIZE(arm_poly1305_algs)) : 0;
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}
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static void __exit arm_poly1305_mod_exit(void)
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{
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if (!IS_REACHABLE(CONFIG_CRYPTO_HASH))
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return;
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if (!static_branch_likely(&have_neon)) {
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crypto_unregister_shash(&arm_poly1305_algs[0]);
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return;
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}
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crypto_unregister_shashes(arm_poly1305_algs,
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ARRAY_SIZE(arm_poly1305_algs));
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}
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module_init(arm_poly1305_mod_init);
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module_exit(arm_poly1305_mod_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("poly1305");
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MODULE_ALIAS_CRYPTO("poly1305-arm");
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MODULE_ALIAS_CRYPTO("poly1305-neon");
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