1 /* 2 * Copyright 2021-2024 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /*- 11 * Generic support for SM4 GCM. 12 */ 13 14 #include "cipher_sm4_gcm.h" 15 #include "crypto/sm4_platform.h" 16 17 # define SM4_GCM_HW_SET_KEY_CTR_FN(ks, fn_set_enc_key, fn_block, fn_ctr) \ 18 fn_set_enc_key(key, ks); \ 19 CRYPTO_gcm128_init(&ctx->gcm, ks, (block128_f)fn_block); \ 20 ctx->ctr = (ctr128_f)fn_ctr; \ 21 ctx->key_set = 1; 22 23 static int sm4_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key, 24 size_t keylen) 25 { 26 PROV_SM4_GCM_CTX *actx = (PROV_SM4_GCM_CTX *)ctx; 27 SM4_KEY *ks = &actx->ks.ks; 28 29 # ifdef HWSM4_CAPABLE 30 if (HWSM4_CAPABLE) { 31 # ifdef HWSM4_ctr32_encrypt_blocks 32 SM4_GCM_HW_SET_KEY_CTR_FN(ks, HWSM4_set_encrypt_key, HWSM4_encrypt, 33 HWSM4_ctr32_encrypt_blocks); 34 # else /* HWSM4_ctr32_encrypt_blocks */ 35 SM4_GCM_HW_SET_KEY_CTR_FN(ks, HWSM4_set_encrypt_key, HWSM4_encrypt, NULL); 36 # endif 37 } else 38 # endif /* HWSM4_CAPABLE */ 39 40 #ifdef VPSM4_EX_CAPABLE 41 if (VPSM4_EX_CAPABLE) { 42 SM4_GCM_HW_SET_KEY_CTR_FN(ks, vpsm4_ex_set_encrypt_key, vpsm4_ex_encrypt, 43 vpsm4_ex_ctr32_encrypt_blocks); 44 } else 45 #endif /* VPSM4_EX_CAPABLE */ 46 47 # ifdef VPSM4_CAPABLE 48 if (VPSM4_CAPABLE) { 49 SM4_GCM_HW_SET_KEY_CTR_FN(ks, vpsm4_set_encrypt_key, vpsm4_encrypt, 50 vpsm4_ctr32_encrypt_blocks); 51 } else 52 # endif /* VPSM4_CAPABLE */ 53 { 54 SM4_GCM_HW_SET_KEY_CTR_FN(ks, ossl_sm4_set_key, ossl_sm4_encrypt, NULL); 55 } 56 57 return 1; 58 } 59 60 static int hw_gcm_cipher_update(PROV_GCM_CTX *ctx, const unsigned char *in, 61 size_t len, unsigned char *out) 62 { 63 if (ctx->enc) { 64 if (ctx->ctr != NULL) { 65 if (CRYPTO_gcm128_encrypt_ctr32(&ctx->gcm, in, out, len, ctx->ctr)) 66 return 0; 67 } else { 68 if (CRYPTO_gcm128_encrypt(&ctx->gcm, in, out, len)) 69 return 0; 70 } 71 } else { 72 if (ctx->ctr != NULL) { 73 if (CRYPTO_gcm128_decrypt_ctr32(&ctx->gcm, in, out, len, ctx->ctr)) 74 return 0; 75 } else { 76 if (CRYPTO_gcm128_decrypt(&ctx->gcm, in, out, len)) 77 return 0; 78 } 79 } 80 return 1; 81 } 82 83 static const PROV_GCM_HW sm4_gcm = { 84 sm4_gcm_initkey, 85 ossl_gcm_setiv, 86 ossl_gcm_aad_update, 87 hw_gcm_cipher_update, 88 ossl_gcm_cipher_final, 89 ossl_gcm_one_shot 90 }; 91 92 #if defined(OPENSSL_CPUID_OBJ) && defined(__riscv) && __riscv_xlen == 64 93 # include "cipher_sm4_gcm_hw_rv64i.inc" 94 #else 95 const PROV_GCM_HW *ossl_prov_sm4_hw_gcm(size_t keybits) 96 { 97 return &sm4_gcm; 98 } 99 #endif 100