1 /* dsa_asn1.c */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2000. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/dsa.h> 62 #include <openssl/asn1.h> 63 #include <openssl/asn1t.h> 64 #include <openssl/rand.h> 65 66 /* Override the default new methods */ 67 static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 68 void *exarg) 69 { 70 if(operation == ASN1_OP_NEW_PRE) { 71 DSA_SIG *sig; 72 sig = OPENSSL_malloc(sizeof(DSA_SIG)); 73 if (!sig) 74 { 75 DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE); 76 return 0; 77 } 78 sig->r = NULL; 79 sig->s = NULL; 80 *pval = (ASN1_VALUE *)sig; 81 return 2; 82 } 83 return 1; 84 } 85 86 ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = { 87 ASN1_SIMPLE(DSA_SIG, r, CBIGNUM), 88 ASN1_SIMPLE(DSA_SIG, s, CBIGNUM) 89 } ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG) 90 91 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG, DSA_SIG, DSA_SIG) 92 93 /* Override the default free and new methods */ 94 static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 95 void *exarg) 96 { 97 if(operation == ASN1_OP_NEW_PRE) { 98 *pval = (ASN1_VALUE *)DSA_new(); 99 if(*pval) return 2; 100 return 0; 101 } else if(operation == ASN1_OP_FREE_PRE) { 102 DSA_free((DSA *)*pval); 103 *pval = NULL; 104 return 2; 105 } 106 return 1; 107 } 108 109 ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = { 110 ASN1_SIMPLE(DSA, version, LONG), 111 ASN1_SIMPLE(DSA, p, BIGNUM), 112 ASN1_SIMPLE(DSA, q, BIGNUM), 113 ASN1_SIMPLE(DSA, g, BIGNUM), 114 ASN1_SIMPLE(DSA, pub_key, BIGNUM), 115 ASN1_SIMPLE(DSA, priv_key, BIGNUM) 116 } ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey) 117 118 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey) 119 120 ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = { 121 ASN1_SIMPLE(DSA, p, BIGNUM), 122 ASN1_SIMPLE(DSA, q, BIGNUM), 123 ASN1_SIMPLE(DSA, g, BIGNUM), 124 } ASN1_SEQUENCE_END_cb(DSA, DSAparams) 125 126 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams) 127 128 /* DSA public key is a bit trickier... its effectively a CHOICE type 129 * decided by a field called write_params which can either write out 130 * just the public key as an INTEGER or the parameters and public key 131 * in a SEQUENCE 132 */ 133 134 ASN1_SEQUENCE(dsa_pub_internal) = { 135 ASN1_SIMPLE(DSA, pub_key, BIGNUM), 136 ASN1_SIMPLE(DSA, p, BIGNUM), 137 ASN1_SIMPLE(DSA, q, BIGNUM), 138 ASN1_SIMPLE(DSA, g, BIGNUM) 139 } ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal) 140 141 ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = { 142 ASN1_SIMPLE(DSA, pub_key, BIGNUM), 143 ASN1_EX_COMBINE(0, 0, dsa_pub_internal) 144 } ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params) 145 146 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey) 147 148 DSA *DSAparams_dup(DSA *dsa) 149 { 150 return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa); 151 } 152 153 int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig, 154 unsigned int *siglen, DSA *dsa) 155 { 156 DSA_SIG *s; 157 RAND_seed(dgst, dlen); 158 s=DSA_do_sign(dgst,dlen,dsa); 159 if (s == NULL) 160 { 161 *siglen=0; 162 return(0); 163 } 164 *siglen=i2d_DSA_SIG(s,&sig); 165 DSA_SIG_free(s); 166 return(1); 167 } 168 169 /* data has already been hashed (probably with SHA or SHA-1). */ 170 /* returns 171 * 1: correct signature 172 * 0: incorrect signature 173 * -1: error 174 */ 175 int DSA_verify(int type, const unsigned char *dgst, int dgst_len, 176 const unsigned char *sigbuf, int siglen, DSA *dsa) 177 { 178 DSA_SIG *s; 179 int ret=-1; 180 181 s = DSA_SIG_new(); 182 if (s == NULL) return(ret); 183 if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err; 184 ret=DSA_do_verify(dgst,dgst_len,s,dsa); 185 err: 186 DSA_SIG_free(s); 187 return(ret); 188 } 189