packetstorm sync

1 files changed, 174 insertions, 0 deletions

diff --git a/other/ssharp/ssh-rsa.c b/other/ssharp/ssh-rsa.c
new file mode 100644
index 0000000..b502ddb
--- /dev/null
+++ b/other/ssharp/ssh-rsa.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2000 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: ssh-rsa.c,v 1.8 2001/03/27 10:57:00 markus Exp $");
+
+#include <openssl/evp.h>
+#include <openssl/err.h>
+
+#include "xmalloc.h"
+#include "log.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "key.h"
+#include "ssh-rsa.h"
+#include "compat.h"
+
+/* RSASSA-PKCS1-v1_5 (PKCS #1 v2.0 signature) with SHA1 */
+int
+ssh_rsa_sign(
+    Key *key,
+    u_char **sigp, int *lenp,
+    u_char *data, int datalen)
+{
+        const EVP_MD *evp_md;
+        EVP_MD_CTX md;
+        u_char *digest, *sig, *ret;
+        u_int slen, dlen, len;
+        int ok, nid;
+        Buffer b;
+
+        if (key == NULL || key->type != KEY_RSA || key->rsa == NULL) {
+                error("ssh_rsa_sign: no RSA key");
+                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);
+
+        slen = RSA_size(key->rsa);
+        sig = xmalloc(slen);
+
+        ok = RSA_sign(nid, digest, dlen, sig, &len, key->rsa);
+        memset(digest, 'd', dlen);
+        xfree(digest);
+
+        if (ok != 1) {
+                int ecode = ERR_get_error();
+                error("ssh_rsa_sign: RSA_sign failed: %s", ERR_error_string(ecode, NULL));
+                xfree(sig);
+                return -1;
+        }
+        if (len < slen) {
+                int diff = slen - len;
+                debug("slen %d > len %d", slen, len);
+                memmove(sig + diff, sig, len);
+                memset(sig, 0, diff);
+        } else if (len > slen) {
+                error("ssh_rsa_sign: slen %d slen2 %d", slen, len);
+                xfree(sig);
+                return -1;
+        }
+        /* encode signature */
+        buffer_init(&b);
+        buffer_put_cstring(&b, "ssh-rsa");
+        buffer_put_string(&b, sig, slen);
+        len = buffer_len(&b);
+        ret = xmalloc(len);
+        memcpy(ret, buffer_ptr(&b), len);
+        buffer_free(&b);
+        memset(sig, 's', slen);
+        xfree(sig);
+
+        if (lenp != NULL)
+                *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)
+{
+        Buffer b;
+        const EVP_MD *evp_md;
+        EVP_MD_CTX md;
+        char *ktype;
+        u_char *sigblob, *digest;
+        u_int len, dlen;
+        int rlen, ret, nid;
+
+        if (key == NULL || key->type != KEY_RSA || key->rsa == NULL) {
+                error("ssh_rsa_verify: no RSA key");
+                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);
+        ktype = buffer_get_string(&b, NULL);
+        if (strcmp("ssh-rsa", ktype) != 0) {
+                error("ssh_rsa_verify: cannot handle type %s", ktype);
+                buffer_free(&b);
+                xfree(ktype);
+                return -1;
+        }
+        xfree(ktype);
+        sigblob = (u_char *)buffer_get_string(&b, &len);
+        rlen = buffer_len(&b);
+        buffer_free(&b);
+        if(rlen != 0) {
+                xfree(sigblob);
+                error("ssh_rsa_verify: remaining bytes in signature %d", rlen);
+                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);
+                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);
+
+        ret = RSA_verify(nid, digest, dlen, sigblob, len, key->rsa);
+        memset(digest, 'd', dlen);
+        xfree(digest);
+        memset(sigblob, 's', len);
+        xfree(sigblob);
+        if (ret == 0) {
+                int ecode = ERR_get_error();
+                error("ssh_rsa_verify: RSA_verify failed: %s", ERR_error_string(ecode, NULL));
+        }
+        debug("ssh_rsa_verify: signature %scorrect", (ret==0) ? "in" : "");
+        return ret;
+}