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
13
ossl_gcm_setiv(PROV_GCM_CTX * ctx,const unsigned char * iv,size_t ivlen)14 int ossl_gcm_setiv(PROV_GCM_CTX *ctx, const unsigned char *iv, size_t ivlen)
15 {
16 CRYPTO_gcm128_setiv(&ctx->gcm, iv, ivlen);
17 return 1;
18 }
19
ossl_gcm_aad_update(PROV_GCM_CTX * ctx,const unsigned char * aad,size_t aad_len)20 int ossl_gcm_aad_update(PROV_GCM_CTX *ctx, const unsigned char *aad,
21 size_t aad_len)
22 {
23 return CRYPTO_gcm128_aad(&ctx->gcm, aad, aad_len) == 0;
24 }
25
ossl_gcm_cipher_update(PROV_GCM_CTX * ctx,const unsigned char * in,size_t len,unsigned char * out)26 int ossl_gcm_cipher_update(PROV_GCM_CTX *ctx, const unsigned char *in,
27 size_t len, unsigned char *out)
28 {
29 if (ctx->enc) {
30 if (CRYPTO_gcm128_encrypt(&ctx->gcm, in, out, len))
31 return 0;
32 } else {
33 if (CRYPTO_gcm128_decrypt(&ctx->gcm, in, out, len))
34 return 0;
35 }
36 return 1;
37 }
38
ossl_gcm_cipher_final(PROV_GCM_CTX * ctx,unsigned char * tag)39 int ossl_gcm_cipher_final(PROV_GCM_CTX *ctx, unsigned char *tag)
40 {
41 if (ctx->enc) {
42 CRYPTO_gcm128_tag(&ctx->gcm, tag, GCM_TAG_MAX_SIZE);
43 ctx->taglen = GCM_TAG_MAX_SIZE;
44 } else {
45 if (CRYPTO_gcm128_finish(&ctx->gcm, tag, ctx->taglen) != 0)
46 return 0;
47 }
48 return 1;
49 }
50
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)51 int ossl_gcm_one_shot(PROV_GCM_CTX *ctx, unsigned char *aad, size_t aad_len,
52 const unsigned char *in, size_t in_len,
53 unsigned char *out, unsigned char *tag, size_t tag_len)
54 {
55 int ret = 0;
56
57 /* Use saved AAD */
58 if (!ctx->hw->aadupdate(ctx, aad, aad_len))
59 goto err;
60 if (!ctx->hw->cipherupdate(ctx, in, in_len, out))
61 goto err;
62 ctx->taglen = GCM_TAG_MAX_SIZE;
63 if (!ctx->hw->cipherfinal(ctx, tag))
64 goto err;
65 ret = 1;
66
67 err:
68 return ret;
69 }
70