1 /* crypto/dsa/dsa_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 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60 61 #include <stdio.h> 62 #include "cryptlib.h" 63 #include <openssl/bn.h> 64 #include <openssl/dsa.h> 65 #include <openssl/asn1.h> 66 67 const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 68 69 DSA *DSA_new(void) 70 { 71 DSA *ret; 72 73 ret=(DSA *)Malloc(sizeof(DSA)); 74 if (ret == NULL) 75 { 76 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); 77 return(NULL); 78 } 79 ret->pad=0; 80 ret->version=0; 81 ret->write_params=1; 82 ret->p=NULL; 83 ret->q=NULL; 84 ret->g=NULL; 85 ret->flags=DSA_FLAG_CACHE_MONT_P; 86 87 ret->pub_key=NULL; 88 ret->priv_key=NULL; 89 90 ret->kinv=NULL; 91 ret->r=NULL; 92 ret->method_mont_p=NULL; 93 94 ret->references=1; 95 return(ret); 96 } 97 98 void DSA_free(DSA *r) 99 { 100 int i; 101 102 if (r == NULL) return; 103 104 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 105 #ifdef REF_PRINT 106 REF_PRINT("DSA",r); 107 #endif 108 if (i > 0) return; 109 #ifdef REF_CHECK 110 if (i < 0) 111 { 112 fprintf(stderr,"DSA_free, bad reference count\n"); 113 abort(); 114 } 115 #endif 116 117 if (r->p != NULL) BN_clear_free(r->p); 118 if (r->q != NULL) BN_clear_free(r->q); 119 if (r->g != NULL) BN_clear_free(r->g); 120 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 121 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 122 if (r->kinv != NULL) BN_clear_free(r->kinv); 123 if (r->r != NULL) BN_clear_free(r->r); 124 if (r->method_mont_p != NULL) 125 BN_MONT_CTX_free((BN_MONT_CTX *)r->method_mont_p); 126 Free(r); 127 } 128 129 int DSA_size(DSA *r) 130 { 131 int ret,i; 132 ASN1_INTEGER bs; 133 unsigned char buf[4]; 134 135 i=BN_num_bits(r->q); 136 bs.length=(i+7)/8; 137 bs.data=buf; 138 bs.type=V_ASN1_INTEGER; 139 /* If the top bit is set the asn1 encoding is 1 larger. */ 140 buf[0]=0xff; 141 142 i=i2d_ASN1_INTEGER(&bs,NULL); 143 i+=i; /* r and s */ 144 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 145 return(ret); 146 } 147 148 #ifndef NO_DH 149 DH *DSA_dup_DH(DSA *r) 150 { 151 /* DSA has p, q, g, optional pub_key, optional priv_key. 152 * DH has p, optional length, g, optional pub_key, optional priv_key. 153 */ 154 155 DH *ret = NULL; 156 157 if (r == NULL) 158 goto err; 159 ret = DH_new(); 160 if (ret == NULL) 161 goto err; 162 if (r->p != NULL) 163 if ((ret->p = BN_dup(r->p)) == NULL) 164 goto err; 165 if (r->q != NULL) 166 ret->length = BN_num_bits(r->q); 167 if (r->g != NULL) 168 if ((ret->g = BN_dup(r->g)) == NULL) 169 goto err; 170 if (r->pub_key != NULL) 171 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 172 goto err; 173 if (r->priv_key != NULL) 174 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 175 goto err; 176 177 return ret; 178 179 err: 180 if (ret != NULL) 181 DH_free(ret); 182 return NULL; 183 } 184 #endif 185