X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fdsa%2Fdsa_sign.c;h=d09aaea6dbcaeab348d83eb8bcedc5c84992f185;hp=599093a4a86d647b9271060583d22e57fcd7fd2b;hb=e683582bf37de45a9512aea7ff33b9a3ebdf07f4;hpb=190c615d4398cc6c8b61eb7881d7409314529a75 diff --git a/crypto/dsa/dsa_sign.c b/crypto/dsa/dsa_sign.c index 599093a4a8..d09aaea6db 100644 --- a/crypto/dsa/dsa_sign.c +++ b/crypto/dsa/dsa_sign.c @@ -1,76 +1,201 @@ -/* crypto/dsa/dsa_sign.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * 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 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 acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS 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 AUTHOR OR 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. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ -/* Original version from Steven Schoch */ - -#define OPENSSL_FIPSAPI - -#include "cryptlib.h" -#include -#include #include +#include "internal/cryptlib.h" +#include "dsa_local.h" +#include "crypto/asn1_dsa.h" +#include "crypto/dsa.h" -DSA_SIG * DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa) - { - return dsa->meth->dsa_do_sign(dgst, dlen, dsa); - } +DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa) +{ + return dsa->meth->dsa_do_sign(dgst, dlen, dsa); +} +#ifndef OPENSSL_NO_DEPRECATED_3_0 int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp) - { - return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp); - } +{ + return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp); +} +#endif + +DSA_SIG *DSA_SIG_new(void) +{ + DSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig)); + if (sig == NULL) + DSAerr(DSA_F_DSA_SIG_NEW, ERR_R_MALLOC_FAILURE); + return sig; +} + +void DSA_SIG_free(DSA_SIG *sig) +{ + if (sig == NULL) + return; + BN_clear_free(sig->r); + BN_clear_free(sig->s); + OPENSSL_free(sig); +} + +DSA_SIG *d2i_DSA_SIG(DSA_SIG **psig, const unsigned char **ppin, long len) +{ + DSA_SIG *sig; + + if (len < 0) + return NULL; + if (psig != NULL && *psig != NULL) { + sig = *psig; + } else { + sig = DSA_SIG_new(); + if (sig == NULL) + return NULL; + } + if (sig->r == NULL) + sig->r = BN_new(); + if (sig->s == NULL) + sig->s = BN_new(); + if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) { + if (psig == NULL || *psig == NULL) + DSA_SIG_free(sig); + return NULL; + } + if (psig != NULL && *psig == NULL) + *psig = sig; + return sig; +} + +int i2d_DSA_SIG(const DSA_SIG *sig, unsigned char **ppout) +{ + BUF_MEM *buf = NULL; + size_t encoded_len; + WPACKET pkt; + + if (ppout == NULL) { + if (!WPACKET_init_null(&pkt, 0)) + return -1; + } else if (*ppout == NULL) { + if ((buf = BUF_MEM_new()) == NULL + || !WPACKET_init_len(&pkt, buf, 0)) { + BUF_MEM_free(buf); + return -1; + } + } else { + if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0)) + return -1; + } + + if (!encode_der_dsa_sig(&pkt, sig->r, sig->s) + || !WPACKET_get_total_written(&pkt, &encoded_len) + || !WPACKET_finish(&pkt)) { + BUF_MEM_free(buf); + WPACKET_cleanup(&pkt); + return -1; + } + + if (ppout != NULL) { + if (*ppout == NULL) { + *ppout = (unsigned char *)buf->data; + buf->data = NULL; + BUF_MEM_free(buf); + } else { + *ppout += encoded_len; + } + } + + return (int)encoded_len; +} + +int DSA_size(const DSA *dsa) +{ + int ret; + DSA_SIG sig; + + sig.r = sig.s = dsa->q; + ret = i2d_DSA_SIG(&sig, NULL); + + if (ret < 0) + ret = 0; + return ret; +} + +void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps) +{ + if (pr != NULL) + *pr = sig->r; + if (ps != NULL) + *ps = sig->s; +} + +int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s) +{ + if (r == NULL || s == NULL) + return 0; + BN_clear_free(sig->r); + BN_clear_free(sig->s); + sig->r = r; + sig->s = s; + return 1; +} + +int dsa_sign_int(OPENSSL_CTX *libctx, int type, const unsigned char *dgst, + int dlen, unsigned char *sig, unsigned int *siglen, DSA *dsa) +{ + DSA_SIG *s; + + /* legacy case uses the method table */ + if (libctx == NULL || dsa->meth != DSA_get_default_method()) + s = DSA_do_sign(dgst, dlen, dsa); + else + s = dsa_do_sign_int(libctx, dgst, dlen, dsa); + if (s == NULL) { + *siglen = 0; + return 0; + } + *siglen = i2d_DSA_SIG(s, &sig); + DSA_SIG_free(s); + return 1; +} + +int DSA_sign(int type, const unsigned char *dgst, int dlen, + unsigned char *sig, unsigned int *siglen, DSA *dsa) +{ + return dsa_sign_int(NULL, type, dgst, dlen, sig, siglen, dsa); +} + +/* 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; + const unsigned char *p = sigbuf; + unsigned char *der = NULL; + int derlen = -1; + int ret = -1; + + s = DSA_SIG_new(); + if (s == NULL) + return ret; + 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; + ret = DSA_do_verify(dgst, dgst_len, s, dsa); + err: + OPENSSL_clear_free(der, derlen); + DSA_SIG_free(s); + return ret; +} +