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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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