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
14int 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
20int 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
26int 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
39int 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
51int 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
67err:
68    return ret;
69}
70