/* dsa_asn1.c */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project 2000. */ /* ==================================================================== * Copyright (c) 2000 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include <stdio.h> #include "cryptlib.h" #include <openssl/dsa.h> #include <openssl/asn1.h> #include <openssl/asn1t.h> #include <openssl/bn.h> #include <openssl/rand.h> #ifdef OPENSSL_FIPS #include <openssl/fips.h> #endif /* Override the default new methods */ static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it) { if(operation == ASN1_OP_NEW_PRE) { DSA_SIG *sig; sig = OPENSSL_malloc(sizeof(DSA_SIG)); sig->r = NULL; sig->s = NULL; *pval = (ASN1_VALUE *)sig; if(sig) return 2; DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE); return 0; } return 1; } ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = { ASN1_SIMPLE(DSA_SIG, r, CBIGNUM), ASN1_SIMPLE(DSA_SIG, s, CBIGNUM) } ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG) IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG,DSA_SIG,DSA_SIG) /* Override the default free and new methods */ static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it) { if(operation == ASN1_OP_NEW_PRE) { *pval = (ASN1_VALUE *)DSA_new(); if(*pval) return 2; return 0; } else if(operation == ASN1_OP_FREE_PRE) { DSA_free((DSA *)*pval); *pval = NULL; return 2; } return 1; } ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = { ASN1_SIMPLE(DSA, version, LONG), ASN1_SIMPLE(DSA, p, BIGNUM), ASN1_SIMPLE(DSA, q, BIGNUM), ASN1_SIMPLE(DSA, g, BIGNUM), ASN1_SIMPLE(DSA, pub_key, BIGNUM), ASN1_SIMPLE(DSA, priv_key, BIGNUM) } ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey) IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey) ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = { ASN1_SIMPLE(DSA, p, BIGNUM), ASN1_SIMPLE(DSA, q, BIGNUM), ASN1_SIMPLE(DSA, g, BIGNUM), } ASN1_SEQUENCE_END_cb(DSA, DSAparams) IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams) /* DSA public key is a bit trickier... its effectively a CHOICE type * decided by a field called write_params which can either write out * just the public key as an INTEGER or the parameters and public key * in a SEQUENCE */ ASN1_SEQUENCE(dsa_pub_internal) = { ASN1_SIMPLE(DSA, pub_key, BIGNUM), ASN1_SIMPLE(DSA, p, BIGNUM), ASN1_SIMPLE(DSA, q, BIGNUM), ASN1_SIMPLE(DSA, g, BIGNUM) } ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal) ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = { ASN1_SIMPLE(DSA, pub_key, BIGNUM), ASN1_EX_COMBINE(0, 0, dsa_pub_internal) } ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params) IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey) int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig, unsigned int *siglen, DSA *dsa) { DSA_SIG *s; #ifdef OPENSSL_FIPS if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)) { DSAerr(DSA_F_DSA_SIGN, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); return 0; } #endif RAND_seed(dgst, dlen); s=DSA_do_sign(dgst,dlen,dsa); if (s == NULL) { *siglen=0; return(0); } *siglen=i2d_DSA_SIG(s,&sig); DSA_SIG_free(s); return(1); } int DSA_size(const DSA *r) { int ret,i; ASN1_INTEGER bs; unsigned char buf[4]; /* 4 bytes looks really small. However, i2d_ASN1_INTEGER() will not look beyond the first byte, as long as the second parameter is NULL. */ i=BN_num_bits(r->q); bs.length=(i+7)/8; bs.data=buf; bs.type=V_ASN1_INTEGER; /* If the top bit is set the asn1 encoding is 1 larger. */ buf[0]=0xff; i=i2d_ASN1_INTEGER(&bs,NULL); i+=i; /* r and s */ ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); return(ret); } /* data has already been hashed (probably with SHA or SHA-1). */ /* returns * 1: correct signature * 0: incorrect signature * -1: error */ int DSA_verify(int type, const unsigned char *dgst, int dgst_len, const unsigned char *sigbuf, int siglen, DSA *dsa) { DSA_SIG *s; /* rdar://problem/20168109 and others a binary compat issue with OpenSSL zd from zc this change seems to be the problem, and is not critical (for now). */ #if 0 const unsigned char *p = sigbuf; unsigned char *der = NULL; int derlen = -1; #endif int ret=-1; #ifdef OPENSSL_FIPS if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)) { DSAerr(DSA_F_DSA_VERIFY, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); return 0; } #endif s = DSA_SIG_new(); if (s == NULL) return(ret); /* rdar://problem/20168109 and others a binary compat issue with OpenSSL zd from zc this change seems to be the problem, and is not critical (for now). */ #if 0 if (d2i_DSA_SIG(&s,&p,siglen) == NULL) goto err; /* Ensure signature uses DER and doesn't have trailing garbage */ derlen = i2d_DSA_SIG(s, &der); if (derlen != siglen || memcmp(sigbuf, der, derlen)) goto err; #else if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err; #endif ret=DSA_do_verify(dgst,dgst_len,s,dsa); err: /* more from rdar://problem/20168109 and others */ #if 0 if (derlen > 0) { OPENSSL_cleanse(der, derlen); OPENSSL_free(der); } #endif DSA_SIG_free(s); return(ret); }