evp_lib.c revision 109998
1/* crypto/evp/evp_lib.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60#include "cryptlib.h" 61#include <openssl/evp.h> 62#include <openssl/objects.h> 63 64int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 65 { 66 int ret; 67 68 if (c->cipher->set_asn1_parameters != NULL) 69 ret=c->cipher->set_asn1_parameters(c,type); 70 else 71 ret=1; 72 return(ret); 73 } 74 75int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 76 { 77 int ret; 78 79 if (c->cipher->get_asn1_parameters != NULL) 80 ret=c->cipher->get_asn1_parameters(c,type); 81 else 82 ret=1; 83 return(ret); 84 } 85 86int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 87 { 88 int i=0,l; 89 90 if (type != NULL) 91 { 92 l=EVP_CIPHER_CTX_iv_length(c); 93 OPENSSL_assert(l <= sizeof c->iv); 94 i=ASN1_TYPE_get_octetstring(type,c->oiv,l); 95 if (i != l) 96 return(-1); 97 else if (i > 0) 98 memcpy(c->iv,c->oiv,l); 99 } 100 return(i); 101 } 102 103int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) 104 { 105 int i=0,j; 106 107 if (type != NULL) 108 { 109 j=EVP_CIPHER_CTX_iv_length(c); 110 OPENSSL_assert(j <= sizeof c->iv); 111 i=ASN1_TYPE_set_octetstring(type,c->oiv,j); 112 } 113 return(i); 114 } 115 116/* Convert the various cipher NIDs and dummies to a proper OID NID */ 117int EVP_CIPHER_type(const EVP_CIPHER *ctx) 118{ 119 int nid; 120 ASN1_OBJECT *otmp; 121 nid = EVP_CIPHER_nid(ctx); 122 123 switch(nid) { 124 125 case NID_rc2_cbc: 126 case NID_rc2_64_cbc: 127 case NID_rc2_40_cbc: 128 129 return NID_rc2_cbc; 130 131 case NID_rc4: 132 case NID_rc4_40: 133 134 return NID_rc4; 135 136 default: 137 /* Check it has an OID and it is valid */ 138 otmp = OBJ_nid2obj(nid); 139 if(!otmp || !otmp->data) nid = NID_undef; 140 ASN1_OBJECT_free(otmp); 141 return nid; 142 } 143} 144 145