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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
*/
/*
* DES low level APIs are deprecated for public use, but still ok for internal
* use.
*/
#include "internal/deprecated.h"
#include <openssl/rand.h>
#include <openssl/proverr.h>
#include "prov/ciphercommon.h"
#include "cipher_tdes.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
void *ossl_tdes_newctx(void *provctx, int mode, size_t kbits, size_t blkbits,
size_t ivbits, uint64_t flags, const PROV_CIPHER_HW *hw)
{
PROV_TDES_CTX *tctx;
if (!ossl_prov_is_running())
return NULL;
tctx = OPENSSL_zalloc(sizeof(*tctx));
if (tctx != NULL)
ossl_cipher_generic_initkey(tctx, kbits, blkbits, ivbits, mode, flags,
hw, provctx);
return tctx;
}
void *ossl_tdes_dupctx(void *ctx)
{
PROV_TDES_CTX *in = (PROV_TDES_CTX *)ctx;
PROV_TDES_CTX *ret;
if (!ossl_prov_is_running())
return NULL;
ret = OPENSSL_malloc(sizeof(*ret));
if (ret == NULL)
return NULL;
in->base.hw->copyctx(&ret->base, &in->base);
return ret;
}
void ossl_tdes_freectx(void *vctx)
{
PROV_TDES_CTX *ctx = (PROV_TDES_CTX *)vctx;
ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
static int tdes_init(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[], int enc)
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
if (!ossl_prov_is_running())
return 0;
ctx->num = 0;
ctx->bufsz = 0;
ctx->enc = enc;
if (iv != NULL) {
if (!ossl_cipher_generic_initiv(ctx, iv, ivlen))
return 0;
} else if (ctx->iv_set
&& (ctx->mode == EVP_CIPH_CBC_MODE
|| ctx->mode == EVP_CIPH_CFB_MODE
|| ctx->mode == EVP_CIPH_OFB_MODE)) {
/* reset IV to keep compatibility with 1.1.1 */
memcpy(ctx->iv, ctx->oiv, ctx->ivlen);
}
if (key != NULL) {
if (keylen != ctx->keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
if (!ctx->hw->init(ctx, key, ctx->keylen))
return 0;
}
return ossl_cipher_generic_set_ctx_params(ctx, params);
}
int ossl_tdes_einit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[])
{
return tdes_init(vctx, key, keylen, iv, ivlen, params, 1);
}
int ossl_tdes_dinit(void *vctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen,
const OSSL_PARAM params[])
{
return tdes_init(vctx, key, keylen, iv, ivlen, params, 0);
}
CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(ossl_tdes)
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY, NULL, 0),
CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(ossl_tdes)
static int tdes_generatekey(PROV_CIPHER_CTX *ctx, void *ptr)
{
DES_cblock *deskey = ptr;
size_t kl = ctx->keylen;
if (kl == 0 || RAND_priv_bytes_ex(ctx->libctx, ptr, kl, 0) <= 0)
return 0;
DES_set_odd_parity(deskey);
if (kl >= 16)
DES_set_odd_parity(deskey + 1);
if (kl >= 24) {
DES_set_odd_parity(deskey + 2);
return 1;
}
return 0;
}
int ossl_tdes_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
OSSL_PARAM *p;
if (!ossl_cipher_generic_get_ctx_params(vctx, params))
return 0;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_RANDOM_KEY);
if (p != NULL && !tdes_generatekey(ctx, p->data)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GENERATE_KEY);
return 0;
}
return 1;
}
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