From 03e759fc0701b581879524c84b9d78b9e857b3b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Wed, 9 Oct 2002 21:29:34 +0200
Subject: [PATCH] * dsa-sign.c (dsa_sign): Needs the public key as argument, in
addition to the private key. Use const.
Rev: src/nettle/dsa-sign.c:1.3
---
dsa-sign.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/dsa-sign.c b/dsa-sign.c
index 3a69a216..cbf19ceb 100644
--- a/dsa-sign.c
+++ b/dsa-sign.c
@@ -72,7 +72,8 @@ nettle_mpz_random(mpz_t x, const mpz_t n,
}
void
-dsa_sign(struct dsa_private_key *key,
+dsa_sign(const struct dsa_public_key *pub,
+ const struct dsa_private_key *key,
void *random_ctx, nettle_random_func random,
struct sha1_ctx *hash,
struct dsa_signature *signature)
@@ -82,7 +83,7 @@ dsa_sign(struct dsa_private_key *key,
mpz_t tmp;
/* Select k, 0<k<q, randomly */
- mpz_init_set(tmp, key->pub.q);
+ mpz_init_set(tmp, pub->q);
mpz_sub_ui(tmp, tmp, 1);
mpz_init(k);
@@ -90,24 +91,24 @@ dsa_sign(struct dsa_private_key *key,
mpz_add_ui(k, k, 1);
/* Compute r = (g^k (mod p)) (mod q) */
- mpz_powm(tmp, key->pub.g, k, key->pub.p);
- mpz_fdiv_r(signature->r, tmp, key->pub.q);
+ mpz_powm(tmp, pub->g, k, pub->p);
+ mpz_fdiv_r(signature->r, tmp, pub->q);
/* Compute hash */
mpz_init(h);
_dsa_hash(h, hash);
/* Compute k^-1 (mod q) */
- if (!mpz_invert(k, k, key->pub.q))
+ if (!mpz_invert(k, k, pub->q))
/* What do we do now? The key is invalid. */
abort();
/* Compute signature s = k^-1(h + xr) (mod q) */
mpz_mul(tmp, signature->r, key->x);
- mpz_fdiv_r(tmp, tmp, key->pub.q);
+ mpz_fdiv_r(tmp, tmp, pub->q);
mpz_add(tmp, tmp, h);
mpz_mul(tmp, tmp, k);
- mpz_fdiv_r(signature->s, tmp, key->pub.q);
+ mpz_fdiv_r(signature->s, tmp, pub->q);
mpz_clear(k);
mpz_clear(h);
--
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