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/*
* Copyright 2019-2020 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
*/
/*
* This file uses the low level AES functions (which are deprecated for
* non-internal use) in order to implement provider AES ciphers.
*/
#include "internal/deprecated.h"
#include "cipher_aes_siv.h"
static int aes_siv_initkey(void *vctx, const unsigned char *key, size_t keylen)
{
PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx;
SIV128_CONTEXT *sctx = &ctx->siv;
size_t klen = keylen / 2;
switch (klen) {
case 16:
ctx->cbc = EVP_CIPHER_fetch(NULL, "AES-128-CBC", "");
ctx->ctr = EVP_CIPHER_fetch(NULL, "AES-128-CTR", "");
break;
case 24:
ctx->cbc = EVP_CIPHER_fetch(NULL, "AES-192-CBC", "");
ctx->ctr = EVP_CIPHER_fetch(NULL, "AES-192-CTR", "");
break;
case 32:
ctx->cbc = EVP_CIPHER_fetch(NULL, "AES-256-CBC", "");
ctx->ctr = EVP_CIPHER_fetch(NULL, "AES-256-CTR", "");
break;
default:
return 0;
}
/*
* klen is the length of the underlying cipher, not the input key,
* which should be twice as long
*/
return CRYPTO_siv128_init(sctx, key, klen, ctx->cbc, ctx->ctr);
}
static int aes_siv_settag(void *vctx, const unsigned char *tag, size_t tagl)
{
PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx;
SIV128_CONTEXT *sctx = &ctx->siv;
return CRYPTO_siv128_set_tag(sctx, tag, tagl);
}
static void aes_siv_setspeed(void *vctx, int speed)
{
PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx;
SIV128_CONTEXT *sctx = &ctx->siv;
CRYPTO_siv128_speed(sctx, (int)speed);
}
static void aes_siv_cleanup(void *vctx)
{
PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx;
SIV128_CONTEXT *sctx = &ctx->siv;
CRYPTO_siv128_cleanup(sctx);
EVP_CIPHER_free(ctx->cbc);
EVP_CIPHER_free(ctx->ctr);
}
static int aes_siv_cipher(void *vctx, unsigned char *out,
const unsigned char *in, size_t len)
{
PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx;
SIV128_CONTEXT *sctx = &ctx->siv;
/* EncryptFinal or DecryptFinal */
if (in == NULL)
return CRYPTO_siv128_finish(sctx) == 0;
/* Deal with associated data */
if (out == NULL)
return (CRYPTO_siv128_aad(sctx, in, len) == 1);
if (ctx->enc)
return CRYPTO_siv128_encrypt(sctx, in, out, len) > 0;
return CRYPTO_siv128_decrypt(sctx, in, out, len) > 0;
}
static const PROV_CIPHER_HW_AES_SIV aes_siv_hw =
{
aes_siv_initkey,
aes_siv_cipher,
aes_siv_setspeed,
aes_siv_settag,
aes_siv_cleanup
};
const PROV_CIPHER_HW_AES_SIV *PROV_CIPHER_HW_aes_siv(size_t keybits)
{
return &aes_siv_hw;
}
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