X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Fec%2Fec_cvt.c;h=bfcbab35fe695d32beffbe8a704af40289f81d5c;hb=e1e6c4dae7c84e5a77c66e5cd8cd894aed5820bf;hp=be06d3d92f9405f02a6c36431d59e40b13f60507;hpb=38e3c5815c142e905f0a023d86c066283889cf4a;p=oweals%2Fopenssl.git

diff --git a/crypto/ec/ec_cvt.c b/crypto/ec/ec_cvt.c
index be06d3d92f..bfcbab35fe 100644
--- a/crypto/ec/ec_cvt.c
+++ b/crypto/ec/ec_cvt.c
@@ -1,7 +1,9 @@
-/* TODO */
 /* crypto/ec/ec_cvt.c */
+/*
+ * Originally written by Bodo Moeller for the OpenSSL project.
+ */
 /* ====================================================================
- * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -53,5 +55,116 @@
  * Hudson (tjh@cryptsoft.com).
  *
  */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ *
+ * Portions of the attached software ("Contribution") are developed by 
+ * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
+ *
+ * The Contribution is licensed pursuant to the OpenSSL open source
+ * license provided above.
+ *
+ * The elliptic curve binary polynomial software is originally written by
+ * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
+ *
+ */
 
+#include <openssl/err.h>
 #include "ec_lcl.h"
+
+
+EC_GROUP *EC_GROUP_new_curve_GFp(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+	{
+	const EC_METHOD *meth;
+	EC_GROUP *ret;
+
+#if defined(OPENSSL_BN_ASM_MONT)
+	/*
+	 * This might appear controversial, but the fact is that generic
+	 * prime method was observed to deliver better performance even
+	 * for NIST primes on a range of platforms, e.g.: 60%-15%
+	 * improvement on IA-64, ~25% on ARM, 30%-90% on P4, 20%-25%
+	 * in 32-bit build and 35%--12% in 64-bit build on Core2...
+	 * Coefficients are relative to optimized bn_nist.c for most
+	 * intensive ECDSA verify and ECDH operations for 192- and 521-
+	 * bit keys respectively. Choice of these boundary values is
+	 * arguable, because the dependency of improvement coefficient
+	 * from key length is not a "monotone" curve. For example while
+	 * 571-bit result is 23% on ARM, 384-bit one is -1%. But it's
+	 * generally faster, sometimes "respectfully" faster, sometimes
+	 * "tolerably" slower... What effectively happens is that loop
+	 * with bn_mul_add_words is put against bn_mul_mont, and the
+	 * latter "wins" on short vectors. Correct solution should be
+	 * implementing dedicated NxN multiplication subroutines for
+	 * small N. But till it materializes, let's stick to generic
+	 * prime method...
+	 *						<appro>
+	 */
+	meth = EC_GFp_mont_method();
+#else
+	meth = EC_GFp_nist_method();
+#endif
+	
+	ret = EC_GROUP_new(meth);
+	if (ret == NULL)
+		return NULL;
+
+	if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx))
+		{
+		unsigned long err;
+		  
+		err = ERR_peek_last_error();
+
+		if (!(ERR_GET_LIB(err) == ERR_LIB_EC &&
+			((ERR_GET_REASON(err) == EC_R_NOT_A_NIST_PRIME) ||
+			 (ERR_GET_REASON(err) == EC_R_NOT_A_SUPPORTED_NIST_PRIME))))
+			{
+			/* real error */
+			
+			EC_GROUP_clear_free(ret);
+			return NULL;
+			}
+			
+		
+		/* not an actual error, we just cannot use EC_GFp_nist_method */
+
+		ERR_clear_error();
+
+		EC_GROUP_clear_free(ret);
+		meth = EC_GFp_mont_method();
+
+		ret = EC_GROUP_new(meth);
+		if (ret == NULL)
+			return NULL;
+
+		if (!EC_GROUP_set_curve_GFp(ret, p, a, b, ctx))
+			{
+			EC_GROUP_clear_free(ret);
+			return NULL;
+			}
+		}
+
+	return ret;
+	}
+
+#ifndef OPENSSL_NO_EC2M
+EC_GROUP *EC_GROUP_new_curve_GF2m(const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+	{
+	const EC_METHOD *meth;
+	EC_GROUP *ret;
+	
+	meth = EC_GF2m_simple_method();
+	
+	ret = EC_GROUP_new(meth);
+	if (ret == NULL)
+		return NULL;
+
+	if (!EC_GROUP_set_curve_GF2m(ret, p, a, b, ctx))
+		{
+		EC_GROUP_clear_free(ret);
+		return NULL;
+		}
+
+	return ret;
+	}
+#endif