/* fips/ecdsa/fips_ecdsavs.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2011 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
 * 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.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS CONTRIBUTORS 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.
 * ====================================================================
 */

#define OPENSSL_FIPSAPI
#include <openssl/opensslconf.h>
#include <stdio.h>

#ifndef OPENSSL_FIPS

int main(int argc, char **argv)
{
    printf("No FIPS ECDSA support\n");
    return(0);
}
#else

#include <string.h>
#include <ctype.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/ecdsa.h>
#include <openssl/evp.h>
#include "fips_utl.h"

#include <openssl/objects.h>


static int elookup_curve(char *in, char *curve_name, const EVP_MD **pmd)
	{
	char *cname, *p;
	/* Copy buffer as we will change it */
	strcpy(curve_name, in);
	cname = curve_name + 1;
	p = strchr(cname, ']');
	if (!p)
		{
		fprintf(stderr, "Parse error: missing ]\n");
		return NID_undef;
		}
	*p = 0;
	p = strchr(cname, ',');
	if (p)
		{
		if (!pmd)
			{
			fprintf(stderr, "Parse error: unexpected digest\n");
			return NID_undef;
			}
		*p = 0;
		p++;

		if (!strcmp(p, "SHA-1"))
			*pmd = EVP_sha1();
		else if (!strcmp(p, "SHA-224"))
			*pmd = EVP_sha224();
		else if (!strcmp(p, "SHA-256"))
			*pmd = EVP_sha256();
		else if (!strcmp(p, "SHA-384"))
			*pmd = EVP_sha384();
		else if (!strcmp(p, "SHA-512"))
			*pmd = EVP_sha512();
		else
			{
			fprintf(stderr, "Unknown digest %s\n", p);
			return NID_undef;
			}
		}
	else if(pmd)
		*pmd = EVP_sha1();

	if (!strcmp(cname, "B-163"))
		return NID_sect163r2;
	if (!strcmp(cname, "B-233"))
		return NID_sect233r1;
	if (!strcmp(cname, "B-283"))
		return NID_sect283r1;
	if (!strcmp(cname, "B-409"))
		return NID_sect409r1;
	if (!strcmp(cname, "B-571"))
		return NID_sect571r1;
	if (!strcmp(cname, "K-163"))
		return NID_sect163k1;
	if (!strcmp(cname, "K-233"))
		return NID_sect233k1;
	if (!strcmp(cname, "K-283"))
		return NID_sect283k1;
	if (!strcmp(cname, "K-409"))
		return NID_sect409k1;
	if (!strcmp(cname, "K-571"))
		return NID_sect571k1;
	if (!strcmp(cname, "P-192"))
		return NID_X9_62_prime192v1;
	if (!strcmp(cname, "P-224"))
		return NID_secp224r1;
	if (!strcmp(cname, "P-256"))
		return NID_X9_62_prime256v1;
	if (!strcmp(cname, "P-384"))
		return NID_secp384r1;
	if (!strcmp(cname, "P-521"))
		return NID_secp521r1;

	fprintf(stderr, "Unknown Curve name %s\n", cname);
	return NID_undef;
	}

static int ec_get_pubkey(EC_KEY *key, BIGNUM *x, BIGNUM *y)
	{
	const EC_POINT *pt;
	const EC_GROUP *grp;
	const EC_METHOD *meth;
	int rv;
	BN_CTX *ctx;
	ctx = BN_CTX_new();
	if (!ctx)
		return 0;
	grp = EC_KEY_get0_group(key);
	pt = EC_KEY_get0_public_key(key);
	meth = EC_GROUP_method_of(grp);
	if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
		rv = EC_POINT_get_affine_coordinates_GFp(grp, pt, x, y, ctx);
	else
#ifdef OPENSSL_NO_EC2M
		{
		fprintf(stderr, "ERROR: GF2m not supported\n");
		exit(1);
		}
#else
		rv = EC_POINT_get_affine_coordinates_GF2m(grp, pt, x, y, ctx);
#endif

	BN_CTX_free(ctx);

	return rv;

	}

static int KeyPair(FILE *in, FILE *out)
	{
	char buf[2048], lbuf[2048];
	char *keyword, *value;
	int curve_nid = NID_undef;
	int i, count;
	BIGNUM *Qx = NULL, *Qy = NULL;
	const BIGNUM *d = NULL;
	EC_KEY *key = NULL;
	Qx = BN_new();
	Qy = BN_new();
	while(fgets(buf, sizeof buf, in) != NULL)
		{
		if (*buf == '[' && buf[2] == '-')
			{
			if (buf[2] == '-')
			curve_nid = elookup_curve(buf, lbuf, NULL);
			fputs(buf, out);
			continue;
			}
		if (!parse_line(&keyword, &value, lbuf, buf))
			{
			fputs(buf, out);
			continue;
			}
		if (!strcmp(keyword, "N"))
			{
			count = atoi(value);

			for (i = 0; i < count; i++)
				{

				key = EC_KEY_new_by_curve_name(curve_nid);
				if (!EC_KEY_generate_key(key))
					{
					fprintf(stderr, "Error generating key\n");
					return 0;
					}

				if (!ec_get_pubkey(key, Qx, Qy))
					{
					fprintf(stderr, "Error getting public key\n");
					return 0;
					}

				d = EC_KEY_get0_private_key(key);

				do_bn_print_name(out, "d", d);
				do_bn_print_name(out, "Qx", Qx);
				do_bn_print_name(out, "Qy", Qy);
				fputs(RESP_EOL, out);
				EC_KEY_free(key);

				}

			}

		}
	BN_free(Qx);
	BN_free(Qy);
	return 1;
	}

static int PKV(FILE *in, FILE *out)
	{

	char buf[2048], lbuf[2048];
	char *keyword, *value;
	int curve_nid = NID_undef;
	BIGNUM *Qx = NULL, *Qy = NULL;
	EC_KEY *key = NULL;
	while(fgets(buf, sizeof buf, in) != NULL)
		{
		fputs(buf, out);
		if (*buf == '[' && buf[2] == '-')
			{
			curve_nid = elookup_curve(buf, lbuf, NULL);
			if (curve_nid == NID_undef)
				return 0;
				
			}
		if (!parse_line(&keyword, &value, lbuf, buf))
			continue;
		if (!strcmp(keyword, "Qx"))
			{
			if (!do_hex2bn(&Qx, value))
				{
				fprintf(stderr, "Invalid Qx value\n");
				return 0;
				}
			}
		if (!strcmp(keyword, "Qy"))
			{
			int rv;
			if (!do_hex2bn(&Qy, value))
				{
				fprintf(stderr, "Invalid Qy value\n");
				return 0;
				}
			key = EC_KEY_new_by_curve_name(curve_nid);
			no_err = 1;
			rv = EC_KEY_set_public_key_affine_coordinates(key, Qx, Qy);
			no_err = 0;
			EC_KEY_free(key);
			fprintf(out, "Result = %s" RESP_EOL, rv ? "P":"F");
			}

		}
	BN_free(Qx);
	BN_free(Qy);
	return 1;
	}

static int SigGen(FILE *in, FILE *out)
	{
	char buf[2048], lbuf[2048];
	char *keyword, *value;
	unsigned char *msg;
	int curve_nid = NID_undef;
	long mlen;
	BIGNUM *Qx = NULL, *Qy = NULL;
	EC_KEY *key = NULL;
	ECDSA_SIG *sig = NULL;
	const EVP_MD *digest = NULL;
	Qx = BN_new();
	Qy = BN_new();
	while(fgets(buf, sizeof buf, in) != NULL)
		{
		fputs(buf, out);
		if (*buf == '[')
			{
			curve_nid = elookup_curve(buf, lbuf, &digest);
			if (curve_nid == NID_undef)
				return 0;
			}
		if (!parse_line(&keyword, &value, lbuf, buf))
			continue;
		if (!strcmp(keyword, "Msg"))
			{
			msg = hex2bin_m(value, &mlen);
			if (!msg)
				{
				fprintf(stderr, "Invalid Message\n");
				return 0;
				}

			key = EC_KEY_new_by_curve_name(curve_nid);
			if (!EC_KEY_generate_key(key))
				{
				fprintf(stderr, "Error generating key\n");
				return 0;
				}

			if (!ec_get_pubkey(key, Qx, Qy))
				{
				fprintf(stderr, "Error getting public key\n");
				return 0;
				}

	    		sig = FIPS_ecdsa_sign(key, msg, mlen, digest);

			if (!sig)
				{
				fprintf(stderr, "Error signing message\n");
				return 0;
				}

			do_bn_print_name(out, "Qx", Qx);
			do_bn_print_name(out, "Qy", Qy);
			do_bn_print_name(out, "R", sig->r);
			do_bn_print_name(out, "S", sig->s);

			EC_KEY_free(key);
			OPENSSL_free(msg);
			FIPS_ecdsa_sig_free(sig);

			}

		}
	BN_free(Qx);
	BN_free(Qy);
	return 1;
	}

static int SigVer(FILE *in, FILE *out)
	{
	char buf[2048], lbuf[2048];
	char *keyword, *value;
	unsigned char *msg = NULL;
	int curve_nid = NID_undef;
	long mlen;
	BIGNUM *Qx = NULL, *Qy = NULL;
	EC_KEY *key = NULL;
	ECDSA_SIG sg, *sig = &sg;
	const EVP_MD *digest = NULL;
	sig->r = NULL;
	sig->s = NULL;
	while(fgets(buf, sizeof buf, in) != NULL)
		{
		fputs(buf, out);
		if (*buf == '[')
			{
			curve_nid = elookup_curve(buf, lbuf, &digest);
			if (curve_nid == NID_undef)
				return 0;
			}
		if (!parse_line(&keyword, &value, lbuf, buf))
			continue;
		if (!strcmp(keyword, "Msg"))
			{
			msg = hex2bin_m(value, &mlen);
			if (!msg)
				{
				fprintf(stderr, "Invalid Message\n");
				return 0;
				}
			}
			
		if (!strcmp(keyword, "Qx"))
			{
			if (!do_hex2bn(&Qx, value))
				{
				fprintf(stderr, "Invalid Qx value\n");
				return 0;
				}
			}
		if (!strcmp(keyword, "Qy"))
			{
			if (!do_hex2bn(&Qy, value))
				{
				fprintf(stderr, "Invalid Qy value\n");
				return 0;
				}
			}
		if (!strcmp(keyword, "R"))
			{
			if (!do_hex2bn(&sig->r, value))
				{
				fprintf(stderr, "Invalid R value\n");
				return 0;
				}
			}
		if (!strcmp(keyword, "S"))
			{
			int rv;
			if (!do_hex2bn(&sig->s, value))
				{
				fprintf(stderr, "Invalid S value\n");
				return 0;
				}
			key = EC_KEY_new_by_curve_name(curve_nid);
			rv = EC_KEY_set_public_key_affine_coordinates(key, Qx, Qy);

			if (rv != 1)
				{
				fprintf(stderr, "Error setting public key\n");
				return 0;
				}

			no_err = 1;
	    		rv = FIPS_ecdsa_verify(key, msg, mlen, digest, sig);
			EC_KEY_free(key);
			if (msg)
				OPENSSL_free(msg);
			no_err = 0;

			fprintf(out, "Result = %s" RESP_EOL, rv ? "P":"F");
			}

		}
	if (sig->r)
		BN_free(sig->r);
	if (sig->s)
		BN_free(sig->s);
	if (Qx)
		BN_free(Qx);
	if (Qy)
		BN_free(Qy);
	return 1;
	}
#ifdef FIPS_ALGVS
int fips_ecdsavs_main(int argc, char **argv)
#else
int main(int argc, char **argv)
#endif
	{
	FILE *in = NULL, *out = NULL;
	const char *cmd = argv[1];
	int rv = 0;
	fips_algtest_init();

	if (argc == 4)
		{
		in = fopen(argv[2], "r");
		if (!in)
			{
			fprintf(stderr, "Error opening input file\n");
			exit(1);
			}
		out = fopen(argv[3], "w");
		if (!out)
			{
			fprintf(stderr, "Error opening output file\n");
			exit(1);
			}
		}
	else if (argc == 2)
		{
		in = stdin;
		out = stdout;
		}

	if (!cmd)
		{
		fprintf(stderr, "fips_ecdsavs [KeyPair|PKV|SigGen|SigVer]\n");
		return 1;
		}
	if (!strcmp(cmd, "KeyPair"))
		rv = KeyPair(in, out);
	else if (!strcmp(cmd, "PKV"))
		rv = PKV(in, out);
	else if (!strcmp(cmd, "SigVer"))
		rv = SigVer(in, out);
	else if (!strcmp(cmd, "SigGen"))
		rv = SigGen(in, out);
	else
		{
		fprintf(stderr, "Unknown command %s\n", cmd);
		return 1;
		}

	if (argc == 4)
		{
		fclose(in);
		fclose(out);
		}

	if (rv <= 0)
		{
		fprintf(stderr, "Error running %s\n", cmd);
		return 1;
		}

	return 0;
	}

#endif