A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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 <schoch@sheba.arc.nasa.gov> */
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/bn.h>
#include <openssl/sha.h>
#include "dsa_locl.h"
#include <openssl/rand.h>
#include <openssl/asn1.h>
static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
static int dsa_sign_setup_no_digest(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
BIGNUM **rp);
static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
BIGNUM **rp, const unsigned char *dgst, int dlen);
static int dsa_do_verify(const unsigned char *dgst, int dgst_len,
DSA_SIG *sig, DSA *dsa);
static int dsa_init(DSA *dsa);
static int dsa_finish(DSA *dsa);
static DSA_METHOD openssl_dsa_meth = {
"OpenSSL DSA method",
dsa_do_sign,
dsa_sign_setup_no_digest,
dsa_do_verify,
NULL, /* dsa_mod_exp, */
NULL, /* dsa_bn_mod_exp, */
dsa_init,
dsa_finish,
DSA_FLAG_FIPS_METHOD,
NULL,
NULL,
NULL
};
/*-
* These macro wrappers replace attempts to use the dsa_mod_exp() and
* bn_mod_exp() handlers in the DSA_METHOD structure. We avoid the problem of
* having a the macro work as an expression by bundling an "err_instr". So;
*
* if (!dsa->meth->bn_mod_exp(dsa, r,dsa->g,&k,dsa->p,ctx,
* dsa->method_mont_p)) goto err;
*
* can be replaced by;
*
* DSA_BN_MOD_EXP(goto err, dsa, r, dsa->g, &k, dsa->p, ctx,
* dsa->method_mont_p);
*/
#define DSA_MOD_EXP(err_instr,dsa,rr,a1,p1,a2,p2,m,ctx,in_mont) \
do { \
int _tmp_res53; \
if ((dsa)->meth->dsa_mod_exp) \
_tmp_res53 = (dsa)->meth->dsa_mod_exp((dsa), (rr), (a1), (p1), \
(a2), (p2), (m), (ctx), (in_mont)); \
else \
_tmp_res53 = BN_mod_exp2_mont((rr), (a1), (p1), (a2), (p2), \
(m), (ctx), (in_mont)); \
if (!_tmp_res53) err_instr; \
} while(0)
#define DSA_BN_MOD_EXP(err_instr,dsa,r,a,p,m,ctx,m_ctx) \
do { \
int _tmp_res53; \
if ((dsa)->meth->bn_mod_exp) \
_tmp_res53 = (dsa)->meth->bn_mod_exp((dsa), (r), (a), (p), \
(m), (ctx), (m_ctx)); \
else \
_tmp_res53 = BN_mod_exp_mont((r), (a), (p), (m), (ctx), (m_ctx)); \
if (!_tmp_res53) err_instr; \
} while(0)
const DSA_METHOD *DSA_OpenSSL(void)
{
return &openssl_dsa_meth;
}
static DSA_SIG *dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
{
BIGNUM *kinv = NULL;
BIGNUM *m;
BIGNUM *xr;
BIGNUM *r, *s;
BN_CTX *ctx = NULL;
int reason = ERR_R_BN_LIB;
DSA_SIG *ret = NULL;
int rv = 0;
m = BN_new();
xr = BN_new();
if (m == NULL || xr == NULL)
goto err;
if (!dsa->p || !dsa->q || !dsa->g) {
reason = DSA_R_MISSING_PARAMETERS;
goto err;
}
ret = DSA_SIG_new();
if (ret == NULL)
goto err;
DSA_SIG_get0(&r, &s, ret);
ctx = BN_CTX_new();
if (ctx == NULL)
goto err;
redo:
if (!dsa_sign_setup(dsa, ctx, &kinv, &r, dgst, dlen))
goto err;
if (dlen > BN_num_bytes(dsa->q))
/*
* if the digest length is greater than the size of q use the
* BN_num_bits(dsa->q) leftmost bits of the digest, see fips 186-3,
* 4.2
*/
dlen = BN_num_bytes(dsa->q);
if (BN_bin2bn(dgst, dlen, m) == NULL)
goto err;
/* Compute s = inv(k) (m + xr) mod q */
if (!BN_mod_mul(xr, dsa->priv_key, r, dsa->q, ctx))
goto err; /* s = xr */
if (!BN_add(s, xr, m))
goto err; /* s = m + xr */
if (BN_cmp(s, dsa->q) > 0)
if (!BN_sub(s, s, dsa->q))
goto err;
if (!BN_mod_mul(s, s, kinv, dsa->q, ctx))
goto err;
/*
* Redo if r or s is zero as required by FIPS 186-3: this is very
* unlikely.
*/
if (BN_is_zero(r) || BN_is_zero(s))
goto redo;
rv = 1;
err:
if (rv == 0) {
DSAerr(DSA_F_DSA_DO_SIGN, reason);
DSA_SIG_free(ret);
ret = NULL;
}
BN_CTX_free(ctx);
BN_clear_free(m);
BN_clear_free(xr);
BN_clear_free(kinv);
return ret;
}
static int dsa_sign_setup_no_digest(DSA *dsa, BN_CTX *ctx_in,
BIGNUM **kinvp, BIGNUM **rp)
{
return dsa_sign_setup(dsa, ctx_in, kinvp, rp, NULL, 0);
}
static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
BIGNUM **kinvp, BIGNUM **rp,
const unsigned char *dgst, int dlen)
{
BN_CTX *ctx = NULL;
BIGNUM *k, *kq, *K, *kinv = NULL, *r = *rp;
int ret = 0;
if (!dsa->p || !dsa->q || !dsa->g) {
DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_MISSING_PARAMETERS);
return 0;
}
k = BN_new();
kq = BN_new();
if (k == NULL || kq == NULL)
goto err;
if (ctx_in == NULL) {
if ((ctx = BN_CTX_new()) == NULL)
goto err;
} else
ctx = ctx_in;
/* Get random k */
do {
if (dgst != NULL) {
/*
* We calculate k from SHA512(private_key + H(message) + random).
* This protects the private key from a weak PRNG.
*/
if (!BN_generate_dsa_nonce(k, dsa->q, dsa->priv_key, dgst,
dlen, ctx))
goto err;
} else if (!BN_rand_range(k, dsa->q))
goto err;
} while (BN_is_zero(k));
if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
BN_set_flags(k, BN_FLG_CONSTTIME);
}
if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
dsa->lock, dsa->p, ctx))
goto err;
}
/* Compute r = (g^k mod p) mod q */
if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
if (!BN_copy(kq, k))
goto err;
/*
* We do not want timing information to leak the length of k, so we
* compute g^k using an equivalent exponent of fixed length. (This
* is a kludge that we need because the BN_mod_exp_mont() does not
* let us specify the desired timing behaviour.)
*/
if (!BN_add(kq, kq, dsa->q))
goto err;
if (BN_num_bits(kq) <= BN_num_bits(dsa->q)) {
if (!BN_add(kq, kq, dsa->q))
goto err;
}
K = kq;
} else {
K = k;
}
DSA_BN_MOD_EXP(goto err, dsa, r, dsa->g, K, dsa->p, ctx,
dsa->method_mont_p);
if (!BN_mod(r, r, dsa->q, ctx))
goto err;
/* Compute part of 's = inv(k) (m + xr) mod q' */
if ((kinv = BN_mod_inverse(NULL, k, dsa->q, ctx)) == NULL)
goto err;
BN_clear_free(*kinvp);
*kinvp = kinv;
kinv = NULL;
ret = 1;
err:
if (!ret)
DSAerr(DSA_F_DSA_SIGN_SETUP, ERR_R_BN_LIB);
if (ctx != ctx_in)
BN_CTX_free(ctx);
BN_clear_free(k);
BN_clear_free(kq);
return ret;
}
static int dsa_do_verify(const unsigned char *dgst, int dgst_len,
DSA_SIG *sig, DSA *dsa)
{
BN_CTX *ctx;
BIGNUM *u1, *u2, *t1;
BN_MONT_CTX *mont = NULL;
BIGNUM *r, *s;
int ret = -1, i;
if (!dsa->p || !dsa->q || !dsa->g) {
DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_MISSING_PARAMETERS);
return -1;
}
i = BN_num_bits(dsa->q);
/* fips 186-3 allows only different sizes for q */
if (i != 160 && i != 224 && i != 256) {
DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_BAD_Q_VALUE);
return -1;
}
if (BN_num_bits(dsa->p) > OPENSSL_DSA_MAX_MODULUS_BITS) {
DSAerr(DSA_F_DSA_DO_VERIFY, DSA_R_MODULUS_TOO_LARGE);
return -1;
}
u1 = BN_new();
u2 = BN_new();
t1 = BN_new();
ctx = BN_CTX_new();
if (u1 == NULL || u2 == NULL || t1 == NULL || ctx == NULL)
goto err;
DSA_SIG_get0(&r, &s, sig);
if (BN_is_zero(r) || BN_is_negative(r) ||
BN_ucmp(r, dsa->q) >= 0) {
ret = 0;
goto err;
}
if (BN_is_zero(s) || BN_is_negative(s) ||
BN_ucmp(s, dsa->q) >= 0) {
ret = 0;
goto err;
}
/*
* Calculate W = inv(S) mod Q save W in u2
*/
if ((BN_mod_inverse(u2, s, dsa->q, ctx)) == NULL)
goto err;
/* save M in u1 */
if (dgst_len > (i >> 3))
/*
* if the digest length is greater than the size of q use the
* BN_num_bits(dsa->q) leftmost bits of the digest, see fips 186-3,
* 4.2
*/
dgst_len = (i >> 3);
if (BN_bin2bn(dgst, dgst_len, u1) == NULL)
goto err;
/* u1 = M * w mod q */
if (!BN_mod_mul(u1, u1, u2, dsa->q, ctx))
goto err;
/* u2 = r * w mod q */
if (!BN_mod_mul(u2, r, u2, dsa->q, ctx))
goto err;
if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
mont = BN_MONT_CTX_set_locked(&dsa->method_mont_p,
dsa->lock, dsa->p, ctx);
if (!mont)
goto err;
}
DSA_MOD_EXP(goto err, dsa, t1, dsa->g, u1, dsa->pub_key, u2, dsa->p, ctx,
mont);
/* BN_copy(&u1,&t1); */
/* let u1 = u1 mod q */
if (!BN_mod(u1, t1, dsa->q, ctx))
goto err;
/*
* V is now in u1. If the signature is correct, it will be equal to R.
*/
ret = (BN_ucmp(u1, r) == 0);
err:
if (ret < 0)
DSAerr(DSA_F_DSA_DO_VERIFY, ERR_R_BN_LIB);
BN_CTX_free(ctx);
BN_free(u1);
BN_free(u2);
BN_free(t1);
return (ret);
}
static int dsa_init(DSA *dsa)
{
dsa->flags |= DSA_FLAG_CACHE_MONT_P;
return (1);
}
static int dsa_finish(DSA *dsa)
{
BN_MONT_CTX_free(dsa->method_mont_p);
return (1);
}