From 2fc4a488978a03338ecc65403597582c77dabeea Mon Sep 17 00:00:00 2001
From: des <des@FreeBSD.org>
Date: Mon, 18 Mar 2002 09:55:03 +0000
Subject: Vendor import of OpenSSH 3.1

---
 crypto/openssh/ssh-rsa.c | 47 ++++++++++++++++++++++++-----------------------
 1 file changed, 24 insertions(+), 23 deletions(-)

(limited to 'crypto/openssh/ssh-rsa.c')

diff --git a/crypto/openssh/ssh-rsa.c b/crypto/openssh/ssh-rsa.c
index b502ddb..8e79d4e 100644
--- a/crypto/openssh/ssh-rsa.c
+++ b/crypto/openssh/ssh-rsa.c
@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: ssh-rsa.c,v 1.8 2001/03/27 10:57:00 markus Exp $");
+RCSID("$OpenBSD: ssh-rsa.c,v 1.16 2002/02/24 19:14:59 markus Exp $");
 
 #include <openssl/evp.h>
 #include <openssl/err.h>
@@ -40,12 +40,12 @@ RCSID("$OpenBSD: ssh-rsa.c,v 1.8 2001/03/27 10:57:00 markus Exp $");
 int
 ssh_rsa_sign(
     Key *key,
-    u_char **sigp, int *lenp,
-    u_char *data, int datalen)
+    u_char **sigp, u_int *lenp,
+    u_char *data, u_int datalen)
 {
 	const EVP_MD *evp_md;
 	EVP_MD_CTX md;
-	u_char *digest, *sig, *ret;
+	u_char digest[EVP_MAX_MD_SIZE], *sig, *ret;
 	u_int slen, dlen, len;
 	int ok, nid;
 	Buffer b;
@@ -54,23 +54,24 @@ ssh_rsa_sign(
 		error("ssh_rsa_sign: no RSA key");
 		return -1;
 	}
+	if (datafellows & SSH_BUG_SIGBLOB) {
+		error("ssh_rsa_sign: SSH_BUG_SIGBLOB not supported");
+		return -1;
+	}
 	nid = (datafellows & SSH_BUG_RSASIGMD5) ? NID_md5 : NID_sha1;
 	if ((evp_md = EVP_get_digestbynid(nid)) == NULL) {
 		error("ssh_rsa_sign: EVP_get_digestbynid %d failed", nid);
 		return -1;
 	}
-	dlen = evp_md->md_size;
-	digest = xmalloc(dlen);
 	EVP_DigestInit(&md, evp_md);
 	EVP_DigestUpdate(&md, data, datalen);
-	EVP_DigestFinal(&md, digest, NULL);
+	EVP_DigestFinal(&md, digest, &dlen);
 
 	slen = RSA_size(key->rsa);
 	sig = xmalloc(slen);
 
 	ok = RSA_sign(nid, digest, dlen, sig, &len, key->rsa);
-	memset(digest, 'd', dlen);
-	xfree(digest);
+	memset(digest, 'd', sizeof(digest));
 
 	if (ok != 1) {
 		int ecode = ERR_get_error();
@@ -103,21 +104,20 @@ ssh_rsa_sign(
 		*lenp = len;
 	if (sigp != NULL)
 		*sigp = ret;
-	debug2("ssh_rsa_sign: done");
 	return 0;
 }
 
 int
 ssh_rsa_verify(
     Key *key,
-    u_char *signature, int signaturelen,
-    u_char *data, int datalen)
+    u_char *signature, u_int signaturelen,
+    u_char *data, u_int datalen)
 {
 	Buffer b;
 	const EVP_MD *evp_md;
 	EVP_MD_CTX md;
 	char *ktype;
-	u_char *sigblob, *digest;
+	u_char digest[EVP_MAX_MD_SIZE], *sigblob;
 	u_int len, dlen;
 	int rlen, ret, nid;
 
@@ -125,13 +125,17 @@ ssh_rsa_verify(
 		error("ssh_rsa_verify: no RSA key");
 		return -1;
 	}
+	if (datafellows & SSH_BUG_SIGBLOB) {
+		error("ssh_rsa_verify: SSH_BUG_SIGBLOB not supported");
+		return -1;
+	}
 	if (BN_num_bits(key->rsa->n) < 768) {
 		error("ssh_rsa_verify: n too small: %d bits",
 		    BN_num_bits(key->rsa->n));
 		return -1;
 	}
 	buffer_init(&b);
-	buffer_append(&b, (char *) signature, signaturelen);
+	buffer_append(&b, signature, signaturelen);
 	ktype = buffer_get_string(&b, NULL);
 	if (strcmp("ssh-rsa", ktype) != 0) {
 		error("ssh_rsa_verify: cannot handle type %s", ktype);
@@ -140,29 +144,26 @@ ssh_rsa_verify(
 		return -1;
 	}
 	xfree(ktype);
-	sigblob = (u_char *)buffer_get_string(&b, &len);
+	sigblob = buffer_get_string(&b, &len);
 	rlen = buffer_len(&b);
 	buffer_free(&b);
-	if(rlen != 0) {
-		xfree(sigblob);
+	if (rlen != 0) {
 		error("ssh_rsa_verify: remaining bytes in signature %d", rlen);
+		xfree(sigblob);
 		return -1;
 	}
 	nid = (datafellows & SSH_BUG_RSASIGMD5) ? NID_md5 : NID_sha1;
 	if ((evp_md = EVP_get_digestbynid(nid)) == NULL) {
-		xfree(sigblob);
 		error("ssh_rsa_verify: EVP_get_digestbynid %d failed", nid);
+		xfree(sigblob);
 		return -1;
 	}
-	dlen = evp_md->md_size;
-	digest = xmalloc(dlen);
 	EVP_DigestInit(&md, evp_md);
 	EVP_DigestUpdate(&md, data, datalen);
-	EVP_DigestFinal(&md, digest, NULL);
+	EVP_DigestFinal(&md, digest, &dlen);
 
 	ret = RSA_verify(nid, digest, dlen, sigblob, len, key->rsa);
-	memset(digest, 'd', dlen);
-	xfree(digest);
+	memset(digest, 'd', sizeof(digest));
 	memset(sigblob, 's', len);
 	xfree(sigblob);
 	if (ret == 0) {
-- 
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