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https://github.com/openssl/openssl.git
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8083fd3a18
Embed libctx in dsa and dh objects and cleanup internal methods to not pass libctx (This makes it consistent with the rsa changes) Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/10910)
208 lines
4.9 KiB
C
208 lines
4.9 KiB
C
/*
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* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* DSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <openssl/bn.h>
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#include "internal/cryptlib.h"
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#include "dsa_local.h"
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#include "crypto/asn1_dsa.h"
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#include "crypto/dsa.h"
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DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
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{
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return dsa->meth->dsa_do_sign(dgst, dlen, dsa);
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}
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
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{
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return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp);
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}
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#endif
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DSA_SIG *DSA_SIG_new(void)
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{
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DSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
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if (sig == NULL)
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DSAerr(DSA_F_DSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
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return sig;
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}
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void DSA_SIG_free(DSA_SIG *sig)
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{
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if (sig == NULL)
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return;
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BN_clear_free(sig->r);
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BN_clear_free(sig->s);
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OPENSSL_free(sig);
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}
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DSA_SIG *d2i_DSA_SIG(DSA_SIG **psig, const unsigned char **ppin, long len)
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{
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DSA_SIG *sig;
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if (len < 0)
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return NULL;
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if (psig != NULL && *psig != NULL) {
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sig = *psig;
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} else {
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sig = DSA_SIG_new();
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if (sig == NULL)
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return NULL;
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}
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if (sig->r == NULL)
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sig->r = BN_new();
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if (sig->s == NULL)
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sig->s = BN_new();
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if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
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if (psig == NULL || *psig == NULL)
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DSA_SIG_free(sig);
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return NULL;
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}
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if (psig != NULL && *psig == NULL)
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*psig = sig;
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return sig;
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}
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int i2d_DSA_SIG(const DSA_SIG *sig, unsigned char **ppout)
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{
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BUF_MEM *buf = NULL;
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size_t encoded_len;
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WPACKET pkt;
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if (ppout == NULL) {
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if (!WPACKET_init_null(&pkt, 0))
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return -1;
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} else if (*ppout == NULL) {
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if ((buf = BUF_MEM_new()) == NULL
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|| !WPACKET_init_len(&pkt, buf, 0)) {
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BUF_MEM_free(buf);
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return -1;
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}
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} else {
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if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
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return -1;
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}
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if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
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|| !WPACKET_get_total_written(&pkt, &encoded_len)
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|| !WPACKET_finish(&pkt)) {
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BUF_MEM_free(buf);
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WPACKET_cleanup(&pkt);
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return -1;
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}
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if (ppout != NULL) {
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if (*ppout == NULL) {
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*ppout = (unsigned char *)buf->data;
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buf->data = NULL;
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BUF_MEM_free(buf);
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} else {
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*ppout += encoded_len;
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}
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}
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return (int)encoded_len;
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}
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int DSA_size(const DSA *dsa)
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{
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int ret;
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DSA_SIG sig;
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sig.r = sig.s = dsa->params.q;
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ret = i2d_DSA_SIG(&sig, NULL);
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if (ret < 0)
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ret = 0;
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return ret;
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}
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void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
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{
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if (pr != NULL)
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*pr = sig->r;
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if (ps != NULL)
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*ps = sig->s;
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}
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int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
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{
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if (r == NULL || s == NULL)
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return 0;
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BN_clear_free(sig->r);
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BN_clear_free(sig->s);
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sig->r = r;
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sig->s = s;
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return 1;
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}
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int dsa_sign_int(int type, const unsigned char *dgst,
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int dlen, unsigned char *sig, unsigned int *siglen, DSA *dsa)
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{
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DSA_SIG *s;
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/* legacy case uses the method table */
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if (dsa->libctx == NULL || dsa->meth != DSA_get_default_method())
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s = DSA_do_sign(dgst, dlen, dsa);
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else
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s = dsa_do_sign_int(dgst, dlen, dsa);
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if (s == NULL) {
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*siglen = 0;
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return 0;
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}
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*siglen = i2d_DSA_SIG(s, &sig);
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DSA_SIG_free(s);
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return 1;
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}
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int DSA_sign(int type, const unsigned char *dgst, int dlen,
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unsigned char *sig, unsigned int *siglen, DSA *dsa)
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{
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return dsa_sign_int(type, dgst, dlen, sig, siglen, dsa);
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}
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/* data has already been hashed (probably with SHA or SHA-1). */
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/*-
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* returns
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* 1: correct signature
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* 0: incorrect signature
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* -1: error
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*/
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int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
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const unsigned char *sigbuf, int siglen, DSA *dsa)
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{
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DSA_SIG *s;
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const unsigned char *p = sigbuf;
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unsigned char *der = NULL;
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int derlen = -1;
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int ret = -1;
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s = DSA_SIG_new();
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if (s == NULL)
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return ret;
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if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
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goto err;
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/* Ensure signature uses DER and doesn't have trailing garbage */
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derlen = i2d_DSA_SIG(s, &der);
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if (derlen != siglen || memcmp(sigbuf, der, derlen))
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goto err;
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ret = DSA_do_verify(dgst, dgst_len, s, dsa);
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err:
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OPENSSL_clear_free(der, derlen);
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DSA_SIG_free(s);
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return ret;
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}
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