From 5549b2f48b7f5b53249932012fd4bcb031545ab9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Wed, 26 Mar 2014 21:50:27 +0100
Subject: [PATCH] Convert dsa_keypair_from_sexp_alist to use struct dsa_params.
---
ChangeLog | 6 ++++
dsa.h | 15 ++++++----
examples/hogweed-benchmark.c | 4 ++-
sexp2dsa.c | 53 ++++++++++++++++++++++++------------
4 files changed, 53 insertions(+), 25 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 9ce03388..86886a8e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
2014-03-26 Niels Möller <nisse@lysator.liu.se>
+ * sexp2dsa.c (dsa_keypair_from_sexp_alist): Converted to new DSA
+ interface. Allow q_size == 0, meaning any q < p is allowed.
+ Additional validity checks.
+ (dsa_sha1_keypair_from_sexp, dsa_sha256_keypair_from_sexp):
+ Converted to new DSA interface.
+
* dsa2sexp.c (dsa_keypair_to_sexp): Converted to new DSA
interface.
* tools/pkcs1-conv.c: Updated uses of dsa_keypair_to_sexp.
diff --git a/dsa.h b/dsa.h
index 3232c602..fa5e918b 100644
--- a/dsa.h
+++ b/dsa.h
@@ -256,8 +256,9 @@ dsa_signature_from_sexp(struct dsa_signature *rs,
unsigned q_bits);
int
-dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
- struct dsa_private_key *priv,
+dsa_keypair_from_sexp_alist(struct dsa_params *params,
+ mpz_t pub,
+ mpz_t priv,
unsigned p_max_bits,
unsigned q_bits,
struct sexp_iterator *i);
@@ -267,14 +268,16 @@ dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
* the public key. */
/* Keys must be initialized before calling this function, as usual. */
int
-dsa_sha1_keypair_from_sexp(struct dsa_public_key *pub,
- struct dsa_private_key *priv,
+dsa_sha1_keypair_from_sexp(struct dsa_params *params,
+ mpz_t pub,
+ mpz_t priv,
unsigned p_max_bits,
size_t length, const uint8_t *expr);
int
-dsa_sha256_keypair_from_sexp(struct dsa_public_key *pub,
- struct dsa_private_key *priv,
+dsa_sha256_keypair_from_sexp(struct dsa_params *params,
+ mpz_t pub,
+ mpz_t priv,
unsigned p_max_bits,
size_t length, const uint8_t *expr);
diff --git a/examples/hogweed-benchmark.c b/examples/hogweed-benchmark.c
index 3513cdd9..3b124117 100644
--- a/examples/hogweed-benchmark.c
+++ b/examples/hogweed-benchmark.c
@@ -303,7 +303,9 @@ bench_dsa_init (unsigned size)
if (! (sexp_transport_iterator_first (&i, sizeof(dsa1024) - 1, dsa1024)
&& sexp_iterator_check_type (&i, "private-key")
&& sexp_iterator_check_type (&i, "dsa")
- && dsa_keypair_from_sexp_alist (&ctx->pub, &ctx->key, 0, DSA_SHA1_Q_BITS, &i)) )
+ && dsa_keypair_from_sexp_alist ((struct dsa_params *) &ctx->pub,
+ ctx->pub.y, ctx->key.x,
+ 0, DSA_SHA1_Q_BITS, &i)) )
die ("Internal error.\n");
ctx->digest = hash_string (&nettle_sha1, 3, "foo");
diff --git a/sexp2dsa.c b/sexp2dsa.c
index 538f9cec..5a038a82 100644
--- a/sexp2dsa.c
+++ b/sexp2dsa.c
@@ -47,8 +47,9 @@ do { \
*/
int
-dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
- struct dsa_private_key *priv,
+dsa_keypair_from_sexp_alist(struct dsa_params *params,
+ mpz_t pub,
+ mpz_t priv,
unsigned p_max_bits,
unsigned q_bits,
struct sexp_iterator *i)
@@ -57,26 +58,39 @@ dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
= { "p", "q", "g", "y", "x" };
struct sexp_iterator values[5];
unsigned nvalues = priv ? 5 : 4;
-
+ unsigned p_bits;
+
if (!sexp_iterator_assoc(i, nvalues, names, values))
return 0;
- if (priv)
- GET(priv->x, q_bits, &values[4]);
-
- GET(pub->p, p_max_bits, &values[0]);
- GET(pub->q, q_bits, &values[1]);
- if (mpz_sizeinbase(pub->q, 2) != q_bits)
+ GET(params->p, p_max_bits, &values[0]);
+ p_bits = mpz_sizeinbase (params->p, 2);
+ GET(params->q, q_bits ? q_bits : p_bits, &values[1]);
+ if (q_bits > 0 && mpz_sizeinbase(params->q, 2) != q_bits)
+ return 0;
+ if (mpz_cmp (params->q, params->p) >= 0)
+ return 0;
+ GET(params->g, p_bits, &values[2]);
+ if (mpz_cmp (params->g, params->p) >= 0)
return 0;
- GET(pub->g, p_max_bits, &values[2]);
- GET(pub->y, p_max_bits, &values[3]);
-
+ GET(pub, p_bits, &values[3]);
+ if (mpz_cmp (pub, params->p) >= 0)
+ return 0;
+
+ if (priv)
+ {
+ GET(priv, mpz_sizeinbase (params->q, 2), &values[4]);
+ if (mpz_cmp (priv, params->q) >= 0)
+ return 0;
+ }
+
return 1;
}
int
-dsa_sha1_keypair_from_sexp(struct dsa_public_key *pub,
- struct dsa_private_key *priv,
+dsa_sha1_keypair_from_sexp(struct dsa_params *params,
+ mpz_t pub,
+ mpz_t priv,
unsigned p_max_bits,
size_t length, const uint8_t *expr)
{
@@ -85,12 +99,14 @@ dsa_sha1_keypair_from_sexp(struct dsa_public_key *pub,
return sexp_iterator_first(&i, length, expr)
&& sexp_iterator_check_type(&i, priv ? "private-key" : "public-key")
&& sexp_iterator_check_type(&i, "dsa")
- && dsa_keypair_from_sexp_alist(pub, priv, p_max_bits, DSA_SHA1_Q_BITS, &i);
+ && dsa_keypair_from_sexp_alist(params, pub, priv,
+ p_max_bits, DSA_SHA1_Q_BITS, &i);
}
int
-dsa_sha256_keypair_from_sexp(struct dsa_public_key *pub,
- struct dsa_private_key *priv,
+dsa_sha256_keypair_from_sexp(struct dsa_params *params,
+ mpz_t pub,
+ mpz_t priv,
unsigned p_max_bits,
size_t length, const uint8_t *expr)
{
@@ -99,7 +115,8 @@ dsa_sha256_keypair_from_sexp(struct dsa_public_key *pub,
return sexp_iterator_first(&i, length, expr)
&& sexp_iterator_check_type(&i, priv ? "private-key" : "public-key")
&& sexp_iterator_check_type(&i, "dsa-sha256")
- && dsa_keypair_from_sexp_alist(pub, priv, p_max_bits, DSA_SHA256_Q_BITS, &i);
+ && dsa_keypair_from_sexp_alist(params, pub, priv,
+ p_max_bits, DSA_SHA256_Q_BITS, &i);
}
int
--
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