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 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 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 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 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 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