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 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 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