1 /*
2 * Copyright (c) 2018 Damien Miller <djm@mindrot.org>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "includes.h"
18
19 #ifdef WITH_OPENSSL
20
21 #include <sys/types.h>
22
23 #include <stdlib.h>
24 #include <string.h>
25
26 #include <openssl/evp.h>
27
28 #ifndef HAVE_EVP_CIPHER_CTX_GET_IV
29 int
EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX * ctx,unsigned char * iv,size_t len)30 EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX *ctx, unsigned char *iv, size_t len)
31 {
32 if (ctx == NULL)
33 return 0;
34 if (EVP_CIPHER_CTX_iv_length(ctx) < 0)
35 return 0;
36 if (len != (size_t)EVP_CIPHER_CTX_iv_length(ctx))
37 return 0;
38 if (len > EVP_MAX_IV_LENGTH)
39 return 0; /* sanity check; shouldn't happen */
40 /*
41 * Skip the memcpy entirely when the requested IV length is zero,
42 * since the iv pointer may be NULL or invalid.
43 */
44 if (len != 0) {
45 if (iv == NULL)
46 return 0;
47 # ifdef HAVE_EVP_CIPHER_CTX_IV
48 memcpy(iv, EVP_CIPHER_CTX_iv(ctx), len);
49 # else
50 memcpy(iv, ctx->iv, len);
51 # endif /* HAVE_EVP_CIPHER_CTX_IV */
52 }
53 return 1;
54 }
55 #endif /* HAVE_EVP_CIPHER_CTX_GET_IV */
56
57 #ifndef HAVE_EVP_CIPHER_CTX_SET_IV
58 int
EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX * ctx,const unsigned char * iv,size_t len)59 EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX *ctx, const unsigned char *iv, size_t len)
60 {
61 if (ctx == NULL)
62 return 0;
63 if (EVP_CIPHER_CTX_iv_length(ctx) < 0)
64 return 0;
65 if (len != (size_t)EVP_CIPHER_CTX_iv_length(ctx))
66 return 0;
67 if (len > EVP_MAX_IV_LENGTH)
68 return 0; /* sanity check; shouldn't happen */
69 /*
70 * Skip the memcpy entirely when the requested IV length is zero,
71 * since the iv pointer may be NULL or invalid.
72 */
73 if (len != 0) {
74 if (iv == NULL)
75 return 0;
76 # ifdef HAVE_EVP_CIPHER_CTX_IV_NOCONST
77 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, len);
78 # else
79 memcpy(ctx->iv, iv, len);
80 # endif /* HAVE_EVP_CIPHER_CTX_IV_NOCONST */
81 }
82 return 1;
83 }
84 #endif /* HAVE_EVP_CIPHER_CTX_SET_IV */
85
86 #endif /* WITH_OPENSSL */
87