83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <crypto/algapi.h>
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#include <crypto/sm4.h>
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#include <crypto/internal/simd.h>
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#include <linux/module.h>
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#include <linux/cpufeature.h>
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#include <linux/types.h>
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MODULE_ALIAS_CRYPTO("sm4");
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MODULE_ALIAS_CRYPTO("sm4-ce");
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MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);
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static int sm4_ce_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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return sm4_expandkey(ctx, key, key_len);
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}
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static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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if (!crypto_simd_usable()) {
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sm4_crypt_block(ctx->rkey_enc, out, in);
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} else {
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kernel_neon_begin();
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sm4_ce_do_crypt(ctx->rkey_enc, out, in);
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kernel_neon_end();
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}
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}
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static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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if (!crypto_simd_usable()) {
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sm4_crypt_block(ctx->rkey_dec, out, in);
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} else {
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kernel_neon_begin();
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sm4_ce_do_crypt(ctx->rkey_dec, out, in);
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kernel_neon_end();
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}
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}
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static struct crypto_alg sm4_ce_alg = {
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.cra_name = "sm4",
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.cra_driver_name = "sm4-ce",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = SM4_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct sm4_ctx),
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.cra_module = THIS_MODULE,
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.cra_u.cipher = {
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.cia_min_keysize = SM4_KEY_SIZE,
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.cia_max_keysize = SM4_KEY_SIZE,
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.cia_setkey = sm4_ce_setkey,
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.cia_encrypt = sm4_ce_encrypt,
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.cia_decrypt = sm4_ce_decrypt
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}
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};
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static int __init sm4_ce_mod_init(void)
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{
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return crypto_register_alg(&sm4_ce_alg);
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}
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static void __exit sm4_ce_mod_fini(void)
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{
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crypto_unregister_alg(&sm4_ce_alg);
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}
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module_cpu_feature_match(SM4, sm4_ce_mod_init);
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module_exit(sm4_ce_mod_fini);
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