1 /*
2 * Copyright 2001-2021 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 #include "prov/ciphercommon.h"
11 #include "prov/ciphercommon_gcm.h"
12
ossl_gcm_setiv(PROV_GCM_CTX * ctx,const unsigned char * iv,size_t ivlen)13 int ossl_gcm_setiv(PROV_GCM_CTX *ctx, const unsigned char *iv, size_t ivlen)
14 {
15 CRYPTO_gcm128_setiv(&ctx->gcm, iv, ivlen);
16 return 1;
17 }
18
ossl_gcm_aad_update(PROV_GCM_CTX * ctx,const unsigned char * aad,size_t aad_len)19 int ossl_gcm_aad_update(PROV_GCM_CTX *ctx, const unsigned char *aad,
20 size_t aad_len)
21 {
22 return CRYPTO_gcm128_aad(&ctx->gcm, aad, aad_len) == 0;
23 }
24
ossl_gcm_cipher_update(PROV_GCM_CTX * ctx,const unsigned char * in,size_t len,unsigned char * out)25 int ossl_gcm_cipher_update(PROV_GCM_CTX *ctx, const unsigned char *in,
26 size_t len, unsigned char *out)
27 {
28 if (ctx->enc) {
29 if (CRYPTO_gcm128_encrypt(&ctx->gcm, in, out, len))
30 return 0;
31 } else {
32 if (CRYPTO_gcm128_decrypt(&ctx->gcm, in, out, len))
33 return 0;
34 }
35 return 1;
36 }
37
ossl_gcm_cipher_final(PROV_GCM_CTX * ctx,unsigned char * tag)38 int ossl_gcm_cipher_final(PROV_GCM_CTX *ctx, unsigned char *tag)
39 {
40 if (ctx->enc) {
41 CRYPTO_gcm128_tag(&ctx->gcm, tag, GCM_TAG_MAX_SIZE);
42 ctx->taglen = GCM_TAG_MAX_SIZE;
43 } else {
44 if (CRYPTO_gcm128_finish(&ctx->gcm, tag, ctx->taglen) != 0)
45 return 0;
46 }
47 return 1;
48 }
49
ossl_gcm_one_shot(PROV_GCM_CTX * ctx,unsigned char * aad,size_t aad_len,const unsigned char * in,size_t in_len,unsigned char * out,unsigned char * tag,size_t tag_len)50 int ossl_gcm_one_shot(PROV_GCM_CTX *ctx, unsigned char *aad, size_t aad_len,
51 const unsigned char *in, size_t in_len,
52 unsigned char *out, unsigned char *tag, size_t tag_len)
53 {
54 int ret = 0;
55
56 /* Use saved AAD */
57 if (!ctx->hw->aadupdate(ctx, aad, aad_len))
58 goto err;
59 if (!ctx->hw->cipherupdate(ctx, in, in_len, out))
60 goto err;
61 ctx->taglen = GCM_TAG_MAX_SIZE;
62 if (!ctx->hw->cipherfinal(ctx, tag))
63 goto err;
64 ret = 1;
65
66 err:
67 return ret;
68 }
69