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/*
* Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "prov/ciphercommon.h"
#include "prov/ciphercommon_ccm.h"
int ossl_ccm_generic_setiv(PROV_CCM_CTX *ctx, const unsigned char *nonce,
size_t nlen, size_t mlen)
{
return CRYPTO_ccm128_setiv(&ctx->ccm_ctx, nonce, nlen, mlen) == 0;
}
int ossl_ccm_generic_setaad(PROV_CCM_CTX *ctx, const unsigned char *aad,
size_t alen)
{
CRYPTO_ccm128_aad(&ctx->ccm_ctx, aad, alen);
return 1;
}
int ossl_ccm_generic_gettag(PROV_CCM_CTX *ctx, unsigned char *tag, size_t tlen)
{
return CRYPTO_ccm128_tag(&ctx->ccm_ctx, tag, tlen) > 0;
}
int ossl_ccm_generic_auth_encrypt(PROV_CCM_CTX *ctx, const unsigned char *in,
unsigned char *out, size_t len,
unsigned char *tag, size_t taglen)
{
int rv;
if (ctx->str != NULL)
rv = CRYPTO_ccm128_encrypt_ccm64(&ctx->ccm_ctx, in,
out, len, ctx->str) == 0;
else
rv = CRYPTO_ccm128_encrypt(&ctx->ccm_ctx, in, out, len) == 0;
if (rv == 1 && tag != NULL)
rv = (CRYPTO_ccm128_tag(&ctx->ccm_ctx, tag, taglen) > 0);
return rv;
}
int ossl_ccm_generic_auth_decrypt(PROV_CCM_CTX *ctx, const unsigned char *in,
unsigned char *out, size_t len,
unsigned char *expected_tag, size_t taglen)
{
int rv = 0;
if (ctx->str != NULL)
rv = CRYPTO_ccm128_decrypt_ccm64(&ctx->ccm_ctx, in, out, len,
ctx->str) == 0;
else
rv = CRYPTO_ccm128_decrypt(&ctx->ccm_ctx, in, out, len) == 0;
if (rv) {
unsigned char tag[16];
if (!CRYPTO_ccm128_tag(&ctx->ccm_ctx, tag, taglen)
|| CRYPTO_memcmp(tag, expected_tag, taglen) != 0)
rv = 0;
}
if (rv == 0)
OPENSSL_cleanse(out, len);
return rv;
}
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