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 /* Origional version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60 61 #include <stdio.h> 62 #include "cryptlib.h" 63 #include "bn.h" 64 #include "dsa.h" 65 #include "asn1.h" 66 67 char *DSA_version="\0DSA part of SSLeay 0.9.0b 29-Jun-1998"; 68 69 DSA *DSA_new() 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 86 ret->pub_key=NULL; 87 ret->priv_key=NULL; 88 89 ret->kinv=NULL; 90 ret->r=NULL; 91 92 ret->references=1; 93 return(ret); 94 } 95 96 void DSA_free(r) 97 DSA *r; 98 { 99 int i; 100 101 if (r == NULL) return; 102 103 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 104 #ifdef REF_PRINT 105 REF_PRINT("DSA",r); 106 #endif 107 if (i > 0) return; 108 #ifdef REF_CHECK 109 if (i < 0) 110 { 111 fprintf(stderr,"DSA_free, bad reference count\n"); 112 abort(); 113 } 114 #endif 115 116 if (r->p != NULL) BN_clear_free(r->p); 117 if (r->q != NULL) BN_clear_free(r->q); 118 if (r->g != NULL) BN_clear_free(r->g); 119 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 120 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 121 if (r->kinv != NULL) BN_clear_free(r->kinv); 122 if (r->r != NULL) BN_clear_free(r->r); 123 Free(r); 124 } 125 126 int DSA_size(r) 127 DSA *r; 128 { 129 int ret,i; 130 ASN1_INTEGER bs; 131 unsigned char buf[4]; 132 133 i=BN_num_bits(r->q); 134 bs.length=(i+7)/8; 135 bs.data=buf; 136 bs.type=V_ASN1_INTEGER; 137 /* If the top bit is set the asn1 encoding is 1 larger. */ 138 buf[0]=0xff; 139 140 i=i2d_ASN1_INTEGER(&bs,NULL); 141 i+=i; /* r and s */ 142 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 143 return(ret); 144 } 145 146