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 # ifndef HAVE_EVP_CIPHER_CTX_GET_UPDATED_IV
30 int
EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX * ctx,unsigned char * iv,size_t len)31 EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX *ctx, unsigned char *iv, size_t len)
32 {
33 if (ctx == NULL)
34 return 0;
35 if (EVP_CIPHER_CTX_iv_length(ctx) < 0)
36 return 0;
37 if (len != (size_t)EVP_CIPHER_CTX_iv_length(ctx))
38 return 0;
39 if (len > EVP_MAX_IV_LENGTH)
40 return 0; /* sanity check; shouldn't happen */
41 /*
42 * Skip the memcpy entirely when the requested IV length is zero,
43 * since the iv pointer may be NULL or invalid.
44 */
45 if (len != 0) {
46 if (iv == NULL)
47 return 0;
48 # ifdef HAVE_EVP_CIPHER_CTX_IV
49 memcpy(iv, EVP_CIPHER_CTX_iv(ctx), len);
50 # else
51 memcpy(iv, ctx->iv, len);
52 # endif /* HAVE_EVP_CIPHER_CTX_IV */
53 }
54 return 1;
55 }
56 # endif /* HAVE_EVP_CIPHER_CTX_GET_UPDATED_IV */
57 #endif /* HAVE_EVP_CIPHER_CTX_GET_IV */
58
59 #ifndef HAVE_EVP_CIPHER_CTX_SET_IV
60 int
EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX * ctx,const unsigned char * iv,size_t len)61 EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX *ctx, const unsigned char *iv, size_t len)
62 {
63 if (ctx == NULL)
64 return 0;
65 if (EVP_CIPHER_CTX_iv_length(ctx) < 0)
66 return 0;
67 if (len != (size_t)EVP_CIPHER_CTX_iv_length(ctx))
68 return 0;
69 if (len > EVP_MAX_IV_LENGTH)
70 return 0; /* sanity check; shouldn't happen */
71 /*
72 * Skip the memcpy entirely when the requested IV length is zero,
73 * since the iv pointer may be NULL or invalid.
74 */
75 if (len != 0) {
76 if (iv == NULL)
77 return 0;
78 # ifdef HAVE_EVP_CIPHER_CTX_IV_NOCONST
79 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, len);
80 # else
81 memcpy(ctx->iv, iv, len);
82 # endif /* HAVE_EVP_CIPHER_CTX_IV_NOCONST */
83 }
84 return 1;
85 }
86 #endif /* HAVE_EVP_CIPHER_CTX_SET_IV */
87
88 #endif /* WITH_OPENSSL */
89