1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <asm/neon.h> 4 #include <asm/simd.h> 5 #include <crypto/algapi.h> 6 #include <crypto/sm4.h> 7 #include <crypto/internal/simd.h> 8 #include <linux/module.h> 9 #include <linux/cpufeature.h> 10 #include <linux/types.h> 11 12 MODULE_ALIAS_CRYPTO("sm4"); 13 MODULE_ALIAS_CRYPTO("sm4-ce"); 14 MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions"); 15 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 16 MODULE_LICENSE("GPL v2"); 17 18 asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in); 19 20 static int sm4_ce_setkey(struct crypto_tfm *tfm, const u8 *key, 21 unsigned int key_len) 22 { 23 struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); 24 25 return sm4_expandkey(ctx, key, key_len); 26 } 27 28 static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 29 { 30 const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); 31 32 if (!crypto_simd_usable()) { 33 sm4_crypt_block(ctx->rkey_enc, out, in); 34 } else { 35 kernel_neon_begin(); 36 sm4_ce_do_crypt(ctx->rkey_enc, out, in); 37 kernel_neon_end(); 38 } 39 } 40 41 static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 42 { 43 const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); 44 45 if (!crypto_simd_usable()) { 46 sm4_crypt_block(ctx->rkey_dec, out, in); 47 } else { 48 kernel_neon_begin(); 49 sm4_ce_do_crypt(ctx->rkey_dec, out, in); 50 kernel_neon_end(); 51 } 52 } 53 54 static struct crypto_alg sm4_ce_alg = { 55 .cra_name = "sm4", 56 .cra_driver_name = "sm4-ce", 57 .cra_priority = 300, 58 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 59 .cra_blocksize = SM4_BLOCK_SIZE, 60 .cra_ctxsize = sizeof(struct sm4_ctx), 61 .cra_module = THIS_MODULE, 62 .cra_u.cipher = { 63 .cia_min_keysize = SM4_KEY_SIZE, 64 .cia_max_keysize = SM4_KEY_SIZE, 65 .cia_setkey = sm4_ce_setkey, 66 .cia_encrypt = sm4_ce_encrypt, 67 .cia_decrypt = sm4_ce_decrypt 68 } 69 }; 70 71 static int __init sm4_ce_mod_init(void) 72 { 73 return crypto_register_alg(&sm4_ce_alg); 74 } 75 76 static void __exit sm4_ce_mod_fini(void) 77 { 78 crypto_unregister_alg(&sm4_ce_alg); 79 } 80 81 module_cpu_feature_match(SM4, sm4_ce_mod_init); 82 module_exit(sm4_ce_mod_fini); 83