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/*
* Copyright (c) 2018 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#ifdef WITH_OPENSSL
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/evp.h>
#ifndef HAVE_EVP_CIPHER_CTX_GET_IV
int
EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX *ctx, unsigned char *iv, size_t len)
{
if (ctx == NULL)
return 0;
if (EVP_CIPHER_CTX_iv_length(ctx) < 0)
return 0;
if (len != (size_t)EVP_CIPHER_CTX_iv_length(ctx))
return 0;
if (len > EVP_MAX_IV_LENGTH)
return 0; /* sanity check; shouldn't happen */
/*
* Skip the memcpy entirely when the requested IV length is zero,
* since the iv pointer may be NULL or invalid.
*/
if (len != 0) {
if (iv == NULL)
return 0;
# ifdef HAVE_EVP_CIPHER_CTX_IV
memcpy(iv, EVP_CIPHER_CTX_iv(ctx), len);
# else
memcpy(iv, ctx->iv, len);
# endif /* HAVE_EVP_CIPHER_CTX_IV */
}
return 1;
}
#endif /* HAVE_EVP_CIPHER_CTX_GET_IV */
#ifndef HAVE_EVP_CIPHER_CTX_SET_IV
int
EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX *ctx, const unsigned char *iv, size_t len)
{
if (ctx == NULL)
return 0;
if (EVP_CIPHER_CTX_iv_length(ctx) < 0)
return 0;
if (len != (size_t)EVP_CIPHER_CTX_iv_length(ctx))
return 0;
if (len > EVP_MAX_IV_LENGTH)
return 0; /* sanity check; shouldn't happen */
/*
* Skip the memcpy entirely when the requested IV length is zero,
* since the iv pointer may be NULL or invalid.
*/
if (len != 0) {
if (iv == NULL)
return 0;
# ifdef HAVE_EVP_CIPHER_CTX_IV_NOCONST
memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, len);
# else
memcpy(ctx->iv, iv, len);
# endif /* HAVE_EVP_CIPHER_CTX_IV_NOCONST */
}
return 1;
}
#endif /* HAVE_EVP_CIPHER_CTX_SET_IV */
#endif /* WITH_OPENSSL */
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