/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */


#include "apps.h"
#include <string.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/evp.h>

#define KEY_PRIVKEY	1
#define KEY_PUBKEY	2
#define KEY_CERT	3

static void usage(void);

#undef PROG

#define PROG pkeyutl_main

static EVP_PKEY_CTX *init_ctx(int *pkeysize,
				char *keyfile, int keyform, int key_type,
				char *passargin, int pkey_op, ENGINE *e);

static int setup_peer(BIO *err, EVP_PKEY_CTX *ctx, int peerform,
							const char *file);

static int do_keyop(EVP_PKEY_CTX *ctx, int pkey_op,
		unsigned char *out, size_t *poutlen,
		unsigned char *in, size_t inlen);

int MAIN(int argc, char **);

int MAIN(int argc, char **argv)
{
	BIO *in = NULL, *out = NULL;
	char *infile = NULL, *outfile = NULL, *sigfile = NULL;
	ENGINE *e = NULL;
	int pkey_op = EVP_PKEY_OP_SIGN, key_type = KEY_PRIVKEY;
	int keyform = FORMAT_PEM, peerform = FORMAT_PEM;
	char badarg = 0, rev = 0;
	char hexdump = 0, asn1parse = 0;
	EVP_PKEY_CTX *ctx = NULL;
	char *passargin = NULL;
	int keysize = -1;

	unsigned char *buf_in = NULL, *buf_out = NULL, *sig = NULL;
	size_t buf_outlen;
	int buf_inlen = 0, siglen = -1;

	int ret = 1, rv = -1;

	argc--;
	argv++;

	if(!bio_err) bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);

	if (!load_config(bio_err, NULL))
		goto end;
	ERR_load_crypto_strings();
	OpenSSL_add_all_algorithms();
	
	while(argc >= 1)
		{
		if (!strcmp(*argv,"-in"))
			{
			if (--argc < 1) badarg = 1;
                        else infile= *(++argv);
			}
		else if (!strcmp(*argv,"-out"))
			{
			if (--argc < 1) badarg = 1;
			else outfile= *(++argv);
			}
		else if (!strcmp(*argv,"-sigfile"))
			{
			if (--argc < 1) badarg = 1;
			else sigfile= *(++argv);
			}
		else if(!strcmp(*argv, "-inkey"))
			{
			if (--argc < 1)
				badarg = 1;
			else
				{
				ctx = init_ctx(&keysize,
						*(++argv), keyform, key_type,
						passargin, pkey_op, e);
				if (!ctx)
					{
					BIO_puts(bio_err,
						"Error initializing context\n");
					ERR_print_errors(bio_err);
					badarg = 1;
					}
				}
			}
		else if (!strcmp(*argv,"-peerkey"))
			{
			if (--argc < 1)
				badarg = 1;
			else if (!setup_peer(bio_err, ctx, peerform, *(++argv)))
				badarg = 1;
			}
		else if (!strcmp(*argv,"-passin"))
			{
			if (--argc < 1) badarg = 1;
			else passargin= *(++argv);
			}
		else if (strcmp(*argv,"-peerform") == 0)
			{
			if (--argc < 1) badarg = 1;
			else peerform=str2fmt(*(++argv));
			}
		else if (strcmp(*argv,"-keyform") == 0)
			{
			if (--argc < 1) badarg = 1;
			else keyform=str2fmt(*(++argv));
			}
#ifndef OPENSSL_NO_ENGINE
		else if(!strcmp(*argv, "-engine"))
			{
			if (--argc < 1)
				badarg = 1;
			else
				e = setup_engine(bio_err, *(++argv), 0);
			}
#endif
		else if(!strcmp(*argv, "-pubin"))
			key_type = KEY_PUBKEY;
		else if(!strcmp(*argv, "-certin"))
			key_type = KEY_CERT;
		else if(!strcmp(*argv, "-asn1parse"))
			asn1parse = 1;
		else if(!strcmp(*argv, "-hexdump"))
			hexdump = 1;
		else if(!strcmp(*argv, "-sign"))
			pkey_op = EVP_PKEY_OP_SIGN;
		else if(!strcmp(*argv, "-verify"))
			pkey_op = EVP_PKEY_OP_VERIFY;
		else if(!strcmp(*argv, "-verifyrecover"))
			pkey_op = EVP_PKEY_OP_VERIFYRECOVER;
		else if(!strcmp(*argv, "-rev"))
			rev = 1;
		else if(!strcmp(*argv, "-encrypt"))
			pkey_op = EVP_PKEY_OP_ENCRYPT;
		else if(!strcmp(*argv, "-decrypt"))
			pkey_op = EVP_PKEY_OP_DECRYPT;
		else if(!strcmp(*argv, "-derive"))
			pkey_op = EVP_PKEY_OP_DERIVE;
		else if (strcmp(*argv,"-pkeyopt") == 0)
			{
			if (--argc < 1)
				badarg = 1;
			else if (!ctx)
				{
				BIO_puts(bio_err,
					"-pkeyopt command before -inkey\n");
				badarg = 1;
				}
			else if (pkey_ctrl_string(ctx, *(++argv)) <= 0)
				{
				BIO_puts(bio_err, "parameter setting error\n");
				ERR_print_errors(bio_err);
				goto end;
				}
			}
		else badarg = 1;
		if(badarg)
			{
			usage();
			goto end;
			}
		argc--;
		argv++;
		}

	if (!ctx)
		{
		usage();
		goto end;
		}

	if (sigfile && (pkey_op != EVP_PKEY_OP_VERIFY))
		{
		BIO_puts(bio_err, "Signature file specified for non verify\n");
		goto end;
		}

	if (!sigfile && (pkey_op == EVP_PKEY_OP_VERIFY))
		{
		BIO_puts(bio_err, "No signature file specified for verify\n");
		goto end;
		}

/* FIXME: seed PRNG only if needed */
	app_RAND_load_file(NULL, bio_err, 0);

	if (pkey_op != EVP_PKEY_OP_DERIVE)
		{
		if(infile)
			{
			if(!(in = BIO_new_file(infile, "rb")))
				{
				BIO_puts(bio_err,
					"Error Opening Input File\n");
				ERR_print_errors(bio_err);	
				goto end;
				}
			}
		else
			in = BIO_new_fp(stdin, BIO_NOCLOSE);
		}

	if(outfile)
		{
		if(!(out = BIO_new_file(outfile, "wb")))
			{
			BIO_printf(bio_err, "Error Creating Output File\n");
			ERR_print_errors(bio_err);	
			goto end;
			}
		}
	else
		{
		out = BIO_new_fp(stdout, BIO_NOCLOSE);
#ifdef OPENSSL_SYS_VMS
		{
		    BIO *tmpbio = BIO_new(BIO_f_linebuffer());
		    out = BIO_push(tmpbio, out);
		}
#endif
	}

	if (sigfile)
		{
		BIO *sigbio = BIO_new_file(sigfile, "rb");
		if (!sigbio)
			{
			BIO_printf(bio_err, "Can't open signature file %s\n",
								sigfile);
			goto end;
			}
		siglen = bio_to_mem(&sig, keysize * 10, sigbio);
		BIO_free(sigbio);
		if (siglen <= 0)
			{
			BIO_printf(bio_err, "Error reading signature data\n");
			goto end;
			}
		}
	
	if (in)
		{
		/* Read the input data */
		buf_inlen = bio_to_mem(&buf_in, keysize * 10, in);
		if(buf_inlen <= 0)
			{
			BIO_printf(bio_err, "Error reading input Data\n");
			exit(1);
			}
		if(rev)
			{
			size_t i;
			unsigned char ctmp;
			size_t l = (size_t)buf_inlen;
			for(i = 0; i < l/2; i++)
				{
				ctmp = buf_in[i];
				buf_in[i] = buf_in[l - 1 - i];
				buf_in[l - 1 - i] = ctmp;
				}
			}
		}

	if(pkey_op == EVP_PKEY_OP_VERIFY)
		{
		rv  = EVP_PKEY_verify(ctx, sig, (size_t)siglen,
				      buf_in, (size_t)buf_inlen);
		if (rv == 0)
			BIO_puts(out, "Signature Verification Failure\n");
		else if (rv == 1)
			BIO_puts(out, "Signature Verified Successfully\n");
		if (rv >= 0)
			goto end;
		}
	else
		{	
		rv = do_keyop(ctx, pkey_op, NULL, (size_t *)&buf_outlen,
			      buf_in, (size_t)buf_inlen);
		if (rv > 0)
			{
			buf_out = OPENSSL_malloc(buf_outlen);
			if (!buf_out)
				rv = -1;
			else
				rv = do_keyop(ctx, pkey_op,
						buf_out, (size_t *)&buf_outlen,
						buf_in, (size_t)buf_inlen);
			}
		}

	if(rv <= 0)
		{
		BIO_printf(bio_err, "Public Key operation error\n");
		ERR_print_errors(bio_err);
		goto end;
		}
	ret = 0;
	if(asn1parse)
		{
		if(!ASN1_parse_dump(out, buf_out, buf_outlen, 1, -1))
			ERR_print_errors(bio_err);
		}
	else if(hexdump)
		BIO_dump(out, (char *)buf_out, buf_outlen);
	else
		BIO_write(out, buf_out, buf_outlen);

	end:
	if (ctx)
		EVP_PKEY_CTX_free(ctx);
	BIO_free(in);
	BIO_free_all(out);
	if (buf_in)
		OPENSSL_free(buf_in);
	if (buf_out)
		OPENSSL_free(buf_out);
	if (sig)
		OPENSSL_free(sig);
	return ret;
}

static void usage()
{
	BIO_printf(bio_err, "Usage: pkeyutl [options]\n");
	BIO_printf(bio_err, "-in file        input file\n");
	BIO_printf(bio_err, "-out file       output file\n");
	BIO_printf(bio_err, "-sigfile file signature file (verify operation only)\n");
	BIO_printf(bio_err, "-inkey file     input key\n");
	BIO_printf(bio_err, "-keyform arg    private key format - default PEM\n");
	BIO_printf(bio_err, "-pubin          input is a public key\n");
	BIO_printf(bio_err, "-certin         input is a certificate carrying a public key\n");
	BIO_printf(bio_err, "-pkeyopt X:Y    public key options\n");
	BIO_printf(bio_err, "-sign           sign with private key\n");
	BIO_printf(bio_err, "-verify         verify with public key\n");
	BIO_printf(bio_err, "-verifyrecover  verify with public key, recover original data\n");
	BIO_printf(bio_err, "-encrypt        encrypt with public key\n");
	BIO_printf(bio_err, "-decrypt        decrypt with private key\n");
	BIO_printf(bio_err, "-derive         derive shared secret\n");
	BIO_printf(bio_err, "-hexdump        hex dump output\n");
#ifndef OPENSSL_NO_ENGINE
	BIO_printf(bio_err, "-engine e       use engine e, possibly a hardware device.\n");
#endif
	BIO_printf(bio_err, "-passin arg     pass phrase source\n");

}

static EVP_PKEY_CTX *init_ctx(int *pkeysize,
				char *keyfile, int keyform, int key_type,
				char *passargin, int pkey_op, ENGINE *e)
	{
	EVP_PKEY *pkey = NULL;
	EVP_PKEY_CTX *ctx = NULL;
	char *passin = NULL;
	int rv = -1;
	X509 *x;
	if(((pkey_op == EVP_PKEY_OP_SIGN) || (pkey_op == EVP_PKEY_OP_DECRYPT) 
		|| (pkey_op == EVP_PKEY_OP_DERIVE))
		&& (key_type != KEY_PRIVKEY))
		{
		BIO_printf(bio_err, "A private key is needed for this operation\n");
		goto end;
		}
	if(!app_passwd(bio_err, passargin, NULL, &passin, NULL))
		{
		BIO_printf(bio_err, "Error getting password\n");
		goto end;
		}
	switch(key_type)
		{
		case KEY_PRIVKEY:
		pkey = load_key(bio_err, keyfile, keyform, 0,
			passin, e, "Private Key");
		break;

		case KEY_PUBKEY:
		pkey = load_pubkey(bio_err, keyfile, keyform, 0,
			NULL, e, "Public Key");
		break;

		case KEY_CERT:
		x = load_cert(bio_err, keyfile, keyform,
			NULL, e, "Certificate");
		if(x)
			{
			pkey = X509_get_pubkey(x);
			X509_free(x);
			}
		break;

		}

	*pkeysize = EVP_PKEY_size(pkey);

	if (!pkey)
		goto end;

	ctx = EVP_PKEY_CTX_new(pkey, e);

	EVP_PKEY_free(pkey);

	if (!ctx)
		goto end;

	switch(pkey_op)
		{
		case EVP_PKEY_OP_SIGN:
		rv = EVP_PKEY_sign_init(ctx);
		break;

		case EVP_PKEY_OP_VERIFY:
		rv = EVP_PKEY_verify_init(ctx);
		break;

		case EVP_PKEY_OP_VERIFYRECOVER:
		rv = EVP_PKEY_verify_recover_init(ctx);
		break;

		case EVP_PKEY_OP_ENCRYPT:
		rv = EVP_PKEY_encrypt_init(ctx);
		break;

		case EVP_PKEY_OP_DECRYPT:
		rv = EVP_PKEY_decrypt_init(ctx);
		break;

		case EVP_PKEY_OP_DERIVE:
		rv = EVP_PKEY_derive_init(ctx);
		break;
		}

	if (rv <= 0)
		{
		EVP_PKEY_CTX_free(ctx);
		ctx = NULL;
		}

	end:

	if (passin)
		OPENSSL_free(passin);

	return ctx;


	}

static int setup_peer(BIO *err, EVP_PKEY_CTX *ctx, int peerform,
							const char *file)
	{
	EVP_PKEY *peer = NULL;
	int ret;
	if (!ctx)
		{
		BIO_puts(err, "-peerkey command before -inkey\n");
		return 0;
		}
		
	peer = load_pubkey(bio_err, file, peerform, 0, NULL, NULL, "Peer Key");

	if (!peer)
		{
		BIO_printf(bio_err, "Error reading peer key %s\n", file);
		ERR_print_errors(err);
		return 0;
		}

	ret = EVP_PKEY_derive_set_peer(ctx, peer);

	EVP_PKEY_free(peer);
	if (ret <= 0)
		ERR_print_errors(err);
	return ret;
	}

static int do_keyop(EVP_PKEY_CTX *ctx, int pkey_op,
		unsigned char *out, size_t *poutlen,
		unsigned char *in, size_t inlen)
	{
	int rv = 0;
	switch(pkey_op)
		{
		case EVP_PKEY_OP_VERIFYRECOVER:
		rv  = EVP_PKEY_verify_recover(ctx, out, poutlen, in, inlen);
		break;

		case EVP_PKEY_OP_SIGN:
		rv  = EVP_PKEY_sign(ctx, out, poutlen, in, inlen);
		break;

		case EVP_PKEY_OP_ENCRYPT:
		rv  = EVP_PKEY_encrypt(ctx, out, poutlen, in, inlen);
		break;

		case EVP_PKEY_OP_DECRYPT:
		rv  = EVP_PKEY_decrypt(ctx, out, poutlen, in, inlen);
		break; 

		case EVP_PKEY_OP_DERIVE:
		rv  = EVP_PKEY_derive(ctx, out, poutlen);
		break;

		}
	return rv;
	}