+/* $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 1.20 2001/01/29 19:47:30 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);
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);
+}
+