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 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 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