providers/implementations/ciphers/cipher_sm4_gcm_hw.c

   1 /*
   2  * Copyright 2021 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 static int sm4_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key,
  18                            size_t keylen)
  19 {
  20     PROV_SM4_GCM_CTX *actx = (PROV_SM4_GCM_CTX *)ctx;
  21     SM4_KEY *ks = &actx->ks.ks;
  22
  23     ctx->ks = ks;
  24 # ifdef HWSM4_CAPABLE
  25     if (HWSM4_CAPABLE) {
  26         HWSM4_set_encrypt_key(key, ks);
  27         CRYPTO_gcm128_init(&ctx->gcm, ks, (block128_f) HWSM4_encrypt);
  28 #  ifdef HWSM4_ctr32_encrypt_blocks
  29         ctx->ctr = (ctr128_f) HWSM4_ctr32_encrypt_blocks;
  30 #  else /* HWSM4_ctr32_encrypt_blocks */
  31         ctx->ctr = (ctr128_f)NULL;
  32 #  endif
  33     } else
  34 # endif /* HWSM4_CAPABLE */
  35     {
  36         ossl_sm4_set_key(key, ks);
  37         CRYPTO_gcm128_init(&ctx->gcm, ks, (block128_f)ossl_sm4_encrypt);
  38         ctx->ctr = (ctr128_f)NULL;
  39     }
  40     ctx->key_set = 1;
  41
  42     return 1;
  43 }
  44
  45 static int hw_gcm_cipher_update(PROV_GCM_CTX *ctx, const unsigned char *in,
  46                                 size_t len, unsigned char *out)
  47 {
  48     if (ctx->enc) {
  49         if (ctx->ctr != NULL) {
  50             if (CRYPTO_gcm128_encrypt_ctr32(&ctx->gcm, in, out, len, ctx->ctr))
  51                 return 0;
  52         } else {
  53             if (CRYPTO_gcm128_encrypt(&ctx->gcm, in, out, len))
  54                 return 0;
  55         }
  56     } else {
  57         if (ctx->ctr != NULL) {
  58             if (CRYPTO_gcm128_decrypt_ctr32(&ctx->gcm, in, out, len, ctx->ctr))
  59                 return 0;
  60         } else {
  61             if (CRYPTO_gcm128_decrypt(&ctx->gcm, in, out, len))
  62                 return 0;
  63         }
  64     }
  65     return 1;
  66 }
  67
  68 static const PROV_GCM_HW sm4_gcm = {
  69     sm4_gcm_initkey,
  70     ossl_gcm_setiv,
  71     ossl_gcm_aad_update,
  72     hw_gcm_cipher_update,
  73     ossl_gcm_cipher_final,
  74     ossl_gcm_one_shot
  75 };
  76
  77 const PROV_GCM_HW *ossl_prov_sm4_hw_gcm(size_t keybits)
  78 {
  79     return &sm4_gcm;
  80 }