diff options
Diffstat (limited to 'crypto/openssl/crypto/dsa/dsa_asn1.c')
| -rw-r--r-- | crypto/openssl/crypto/dsa/dsa_asn1.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/crypto/openssl/crypto/dsa/dsa_asn1.c b/crypto/openssl/crypto/dsa/dsa_asn1.c new file mode 100644 index 0000000..bc7d7a0 --- /dev/null +++ b/crypto/openssl/crypto/dsa/dsa_asn1.c @@ -0,0 +1,220 @@ +/* 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; + 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); + if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err; + ret=DSA_do_verify(dgst,dgst_len,s,dsa); +err: + DSA_SIG_free(s); + return(ret); + } + |
