- markus@cvs.openbsd.org 2001/04/22 23:58:36

[openssh.git] / ssh-dss.c

diff --git a/ssh-dss.c b/ssh-dss.c
index 96b1565d232a9f0131ed8e2fcd78954fbaa9796c..adc8f983e0927085aeb116a6bf8b8a02122c0844 100644 (file)
--- a/ssh-dss.c
+++ b/ssh-dss.c
@@ -23,20 +23,18 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: ssh-dss.c,v 1.2 2000/12/19 23:17:58 markus Exp $");
+RCSID("$OpenBSD: ssh-dss.c,v 1.6 2001/02/08 19:30:52 itojun Exp $");
+
+#include <openssl/bn.h>
+#include <openssl/evp.h>
 
-#include "ssh.h"
 #include "xmalloc.h"
 #include "buffer.h"
 #include "bufaux.h"
 #include "compat.h"
-
-#include <openssl/bn.h>
-#include <openssl/rsa.h>
-#include <openssl/dsa.h>
-#include <openssl/evp.h>
-
+#include "log.h"
 #include "key.h"
+#include "ssh-dss.h"
 
 #define INTBLOB_LEN    20
 #define SIGBLOB_LEN    (2*INTBLOB_LEN)
@@ -54,7 +52,7 @@ ssh_dss_sign(
        EVP_MD_CTX md;
        u_int rlen;
        u_int slen;
-       u_int len;
+       u_int len, dlen;
        u_char sigblob[SIGBLOB_LEN];
        Buffer b;
 
@@ -62,15 +60,18 @@ ssh_dss_sign(
                error("ssh_dss_sign: no DSA key");
                return -1;
        }
-       digest = xmalloc(evp_md->md_size);
+       dlen = evp_md->md_size;
+       digest = xmalloc(dlen);
        EVP_DigestInit(&md, evp_md);
        EVP_DigestUpdate(&md, data, datalen);
        EVP_DigestFinal(&md, digest, NULL);
 
-       sig = DSA_do_sign(digest, evp_md->md_size, key->dsa);
+       sig = DSA_do_sign(digest, dlen, key->dsa);
        if (sig == NULL) {
                fatal("ssh_dss_sign: cannot sign");
        }
+       memset(digest, 0, dlen);
+       xfree(digest);
 
        rlen = BN_num_bytes(sig->r);
        slen = BN_num_bytes(sig->s);
@@ -185,7 +186,7 @@ ssh_dss_verify(
                memset(sigblob, 0, len);
                xfree(sigblob);
        }
-       
+
        /* sha1 the data */
        dlen = evp_md->md_size;
        digest = xmalloc(dlen);