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 <crypto/internal/simd.h> 7 #include <linux/module.h> 8 #include <linux/cpufeature.h> 9 #include <linux/crypto.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 void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 21 { 22 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm); 23 24 if (!crypto_simd_usable()) { 25 crypto_sm4_encrypt(tfm, out, in); 26 } else { 27 kernel_neon_begin(); 28 sm4_ce_do_crypt(ctx->rkey_enc, out, in); 29 kernel_neon_end(); 30 } 31 } 32 33 static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) 34 { 35 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm); 36 37 if (!crypto_simd_usable()) { 38 crypto_sm4_decrypt(tfm, out, in); 39 } else { 40 kernel_neon_begin(); 41 sm4_ce_do_crypt(ctx->rkey_dec, out, in); 42 kernel_neon_end(); 43 } 44 } 45 46 static struct crypto_alg sm4_ce_alg = { 47 .cra_name = "sm4", 48 .cra_driver_name = "sm4-ce", 49 .cra_priority = 200, 50 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 51 .cra_blocksize = SM4_BLOCK_SIZE, 52 .cra_ctxsize = sizeof(struct crypto_sm4_ctx), 53 .cra_module = THIS_MODULE, 54 .cra_u.cipher = { 55 .cia_min_keysize = SM4_KEY_SIZE, 56 .cia_max_keysize = SM4_KEY_SIZE, 57 .cia_setkey = crypto_sm4_set_key, 58 .cia_encrypt = sm4_ce_encrypt, 59 .cia_decrypt = sm4_ce_decrypt 60 } 61 }; 62 63 static int __init sm4_ce_mod_init(void) 64 { 65 return crypto_register_alg(&sm4_ce_alg); 66 } 67 68 static void __exit sm4_ce_mod_fini(void) 69 { 70 crypto_unregister_alg(&sm4_ce_alg); 71 } 72 73 module_cpu_feature_match(SM4, sm4_ce_mod_init); 74 module_exit(sm4_ce_mod_fini); 75