1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <asm/neon.h> 4 #include <asm/simd.h> 5 #include <crypto/sm4.h> 6 #include <linux/module.h> 7 #include <linux/cpufeature.h> 8 #include <linux/crypto.h> 9 #include <linux/types.h> 10 11 MODULE_ALIAS_CRYPTO("sm4"); 12 MODULE_ALIAS_CRYPTO("sm4-ce"); 13 MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions"); 14 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 15 MODULE_LICENSE("GPL v2"); 16 17 asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in); 18 19 static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 20 { 21 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm); 22 23 if (!may_use_simd()) { 24 crypto_sm4_encrypt(tfm, out, in); 25 } else { 26 kernel_neon_begin(); 27 sm4_ce_do_crypt(ctx->rkey_enc, out, in); 28 kernel_neon_end(); 29 } 30 } 31 32 static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 33 { 34 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm); 35 36 if (!may_use_simd()) { 37 crypto_sm4_decrypt(tfm, out, in); 38 } else { 39 kernel_neon_begin(); 40 sm4_ce_do_crypt(ctx->rkey_dec, out, in); 41 kernel_neon_end(); 42 } 43 } 44 45 static struct crypto_alg sm4_ce_alg = { 46 .cra_name = "sm4", 47 .cra_driver_name = "sm4-ce", 48 .cra_priority = 200, 49 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 50 .cra_blocksize = SM4_BLOCK_SIZE, 51 .cra_ctxsize = sizeof(struct crypto_sm4_ctx), 52 .cra_module = THIS_MODULE, 53 .cra_u.cipher = { 54 .cia_min_keysize = SM4_KEY_SIZE, 55 .cia_max_keysize = SM4_KEY_SIZE, 56 .cia_setkey = crypto_sm4_set_key, 57 .cia_encrypt = sm4_ce_encrypt, 58 .cia_decrypt = sm4_ce_decrypt 59 } 60 }; 61 62 static int __init sm4_ce_mod_init(void) 63 { 64 return crypto_register_alg(&sm4_ce_alg); 65 } 66 67 static void __exit sm4_ce_mod_fini(void) 68 { 69 crypto_unregister_alg(&sm4_ce_alg); 70 } 71 72 module_cpu_feature_match(SM4, sm4_ce_mod_init); 73 module_exit(sm4_ce_mod_fini); 74