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https://github.com/openssl/openssl.git
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8020d79b40
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14512)
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "prov/ciphercommon.h"
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#include "prov/ciphercommon_ccm.h"
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int ossl_ccm_generic_setiv(PROV_CCM_CTX *ctx, const unsigned char *nonce,
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size_t nlen, size_t mlen)
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{
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return CRYPTO_ccm128_setiv(&ctx->ccm_ctx, nonce, nlen, mlen) == 0;
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}
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int ossl_ccm_generic_setaad(PROV_CCM_CTX *ctx, const unsigned char *aad,
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size_t alen)
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{
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CRYPTO_ccm128_aad(&ctx->ccm_ctx, aad, alen);
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return 1;
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}
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int ossl_ccm_generic_gettag(PROV_CCM_CTX *ctx, unsigned char *tag, size_t tlen)
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{
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return CRYPTO_ccm128_tag(&ctx->ccm_ctx, tag, tlen) > 0;
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}
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int ossl_ccm_generic_auth_encrypt(PROV_CCM_CTX *ctx, const unsigned char *in,
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unsigned char *out, size_t len,
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unsigned char *tag, size_t taglen)
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{
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int rv;
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if (ctx->str != NULL)
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rv = CRYPTO_ccm128_encrypt_ccm64(&ctx->ccm_ctx, in,
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out, len, ctx->str) == 0;
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else
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rv = CRYPTO_ccm128_encrypt(&ctx->ccm_ctx, in, out, len) == 0;
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if (rv == 1 && tag != NULL)
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rv = (CRYPTO_ccm128_tag(&ctx->ccm_ctx, tag, taglen) > 0);
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return rv;
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}
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int ossl_ccm_generic_auth_decrypt(PROV_CCM_CTX *ctx, const unsigned char *in,
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unsigned char *out, size_t len,
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unsigned char *expected_tag, size_t taglen)
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{
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int rv = 0;
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if (ctx->str != NULL)
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rv = CRYPTO_ccm128_decrypt_ccm64(&ctx->ccm_ctx, in, out, len,
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ctx->str) == 0;
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else
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rv = CRYPTO_ccm128_decrypt(&ctx->ccm_ctx, in, out, len) == 0;
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if (rv) {
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unsigned char tag[16];
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if (!CRYPTO_ccm128_tag(&ctx->ccm_ctx, tag, taglen)
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|| CRYPTO_memcmp(tag, expected_tag, taglen) != 0)
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rv = 0;
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}
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if (rv == 0)
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OPENSSL_cleanse(out, len);
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return rv;
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}
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