- (dtucker) [entropy.c] Needs unistd.h too.

[openssh.git] / rsa.c

diff --git a/rsa.c b/rsa.c
index 739f92ce20dc050ae824fabcec441ea3c149c277..875b486c489f6804090849aa420f182d898f57aa 100644 (file)
--- a/rsa.c
+++ b/rsa.c
@@ -1,3 +1,4 @@
+/* $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
@@ -60,11 +61,14 @@
  */
 
 #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)
@@ -119,3 +123,26 @@ rsa_private_decrypt(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);
+}
+