+/* $OpenBSD: rsa.c,v 1.28 2006/08/03 03:34:42 deraadt Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* 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.
*
*/
#include "includes.h"
-RCSID("$OpenBSD: rsa.c,v 1.19 2001/01/21 19:05:54 markus Exp $");
+#include <sys/types.h>
+
+#include <string.h>
+
+#include "xmalloc.h"
#include "rsa.h"
#include "log.h"
-#include "xmalloc.h"
void
rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
xfree(inbuf);
}
-void
+int
rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
{
u_char *inbuf, *outbuf;
BN_bn2bin(in, inbuf);
if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
- RSA_PKCS1_PADDING)) <= 0)
- fatal("rsa_private_decrypt() failed");
-
- BN_bin2bn(outbuf, len, out);
-
+ 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;
}
+
+/* calculate p-1 and q-1 */
+void
+rsa_generate_additional_parameters(RSA *rsa)
+{
+ BIGNUM *aux;
+ BN_CTX *ctx;
+
+ if ((aux = BN_new()) == NULL)
+ fatal("rsa_generate_additional_parameters: BN_new failed");
+ if ((ctx = BN_CTX_new()) == NULL)
+ fatal("rsa_generate_additional_parameters: BN_CTX_new failed");
+
+ 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);
+}
+