1 /*
2 * Copyright 2021-2023 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
sm4_gcm_initkey(PROV_GCM_CTX * ctx,const unsigned char * key,size_t keylen)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
hw_gcm_cipher_update(PROV_GCM_CTX * ctx,const unsigned char * in,size_t len,unsigned char * out)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(__riscv) && __riscv_xlen == 64
93 # include "cipher_sm4_gcm_hw_rv64i.inc"
94 #else
ossl_prov_sm4_hw_gcm(size_t keybits)95 const PROV_GCM_HW *ossl_prov_sm4_hw_gcm(size_t keybits)
96 {
97 return &sm4_gcm;
98 }
99 #endif
100
