packetstorm sync

1 files changed, 141 insertions, 0 deletions

diff --git a/other/ssharp/rsa.c b/other/ssharp/rsa.c
new file mode 100644
index 0000000..f69f996
--- /dev/null
+++ b/other/ssharp/rsa.c
@@ -0,0 +1,141 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 1999 Niels Provos.  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.
+ *
+ *
+ * Description of the RSA algorithm can be found e.g. from the following
+ * sources:
+ *
+ *   Bruce Schneier: Applied Cryptography.  John Wiley & Sons, 1994.
+ *
+ *   Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
+ *   Computer Security.  Prentice-Hall, 1989.
+ *
+ *   Man Young Rhee: Cryptography and Secure Data Communications.  McGraw-Hill,
+ *   1994.
+ *
+ *   R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
+ *   System and Method.  US Patent 4,405,829, 1983.
+ *
+ *   Hans Riesel: Prime Numbers and Computer Methods for Factorization.
+ *   Birkhauser, 1994.
+ *
+ *   The RSA Frequently Asked Questions document by RSA Data Security,
+ *   Inc., 1995.
+ *
+ *   RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as
+ * included below:
+ *
+ *     [gone - had to be deleted - what a pity]
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: rsa.c,v 1.22 2001/03/26 23:23:23 markus Exp $");
+
+#include "rsa.h"
+#include "log.h"
+#include "xmalloc.h"
+
+void
+rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
+{
+        u_char *inbuf, *outbuf;
+        int len, ilen, olen;
+
+        if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
+                fatal("rsa_public_encrypt() exponent too small or not odd");
+
+        olen = BN_num_bytes(key->n);
+        outbuf = xmalloc(olen);
+
+        ilen = BN_num_bytes(in);
+        inbuf = xmalloc(ilen);
+        BN_bn2bin(in, inbuf);
+
+        if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
+            RSA_PKCS1_PADDING)) <= 0)
+                fatal("rsa_public_encrypt() failed");
+
+        BN_bin2bn(outbuf, len, out);
+
+        memset(outbuf, 0, olen);
+        memset(inbuf, 0, ilen);
+        xfree(outbuf);
+        xfree(inbuf);
+}
+
+int
+rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
+{
+        u_char *inbuf, *outbuf;
+        int len, ilen, olen;
+
+        olen = BN_num_bytes(key->n);
+        outbuf = xmalloc(olen);
+
+        ilen = BN_num_bytes(in);
+        inbuf = xmalloc(ilen);
+        BN_bn2bin(in, inbuf);
+
+        if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
+            RSA_PKCS1_PADDING)) <= 0) {
+                error("rsa_private_decrypt() failed");
+        } else {
+                BN_bin2bn(outbuf, len, out);
+        }
+        memset(outbuf, 0, olen);
+        memset(inbuf, 0, ilen);
+        xfree(outbuf);
+        xfree(inbuf);
+        return len;
+}
+
+void
+generate_additional_parameters(RSA *rsa)
+{
+        BIGNUM *aux;
+        BN_CTX *ctx;
+        /* Generate additional parameters */
+        aux = BN_new();
+        ctx = BN_CTX_new();
+
+        BN_sub(aux, rsa->q, BN_value_one());
+        BN_mod(rsa->dmq1, rsa->d, aux, ctx);
+
+        BN_sub(aux, rsa->p, BN_value_one());
+        BN_mod(rsa->dmp1, rsa->d, aux, ctx);
+
+        BN_clear_free(aux);
+        BN_CTX_free(ctx);
+}
+