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openssl/apps/ts.c

Index: openssl/apps/ts.c
===================================================================
--- openssl/apps/ts.c	(revision 0)
+++ openssl/apps/ts.c	(revision 0)
@@ -0,0 +1,1147 @@
+/* apps/ts.c */
+/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
+ * project 2002.
+ */
+/* ====================================================================
+ * Copyright (c) 2001 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "apps.h"
+#include <openssl/bio.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/rand.h>
+#include <openssl/ts.h>
+#include <openssl/bn.h>
+
+#undef PROG
+#define PROG	ts_main
+
+/* Length of the nonce of the request in bits (must be a multiple of 8). */
+#define	NONCE_LENGTH		64
+
+/* Macro definitions for the configuration file. */
+#define	ENV_OID_FILE		"oid_file"
+
+/* Local function declarations. */
+
+static ASN1_OBJECT *txt2obj(const char *oid);
+static CONF *load_config_file(const char *configfile);
+
+/* Query related functions. */
+static int query_command(const char *data, char *digest,
+			 const EVP_MD *md, const char *policy, int no_nonce, 
+			 int cert, const char *in, const char *out, int text);
+static BIO *BIO_open_with_default(const char *file, const char *mode, 
+				  FILE *default_fp);
+static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
+			    const char *policy, int no_nonce, int cert);
+static int create_digest(BIO *input, char *digest,
+			 const EVP_MD *md, unsigned char **md_value);
+static ASN1_INTEGER *create_nonce(int bits);
+
+/* Reply related functions. */
+static int reply_command(CONF *conf, char *section, char *engine, 
+			 char *queryfile, char *passin, char *inkey, 
+			 char *signer, char *chain, const char *policy, 
+			 char *in, int token_in, char *out, int token_out,
+			 int text);
+static TS_RESP *read_PKCS7(BIO *in_bio);
+static TS_RESP *create_response(CONF *conf, const char *section, char *engine,
+				char *queryfile, char *passin, char *inkey,
+				char *signer, char *chain, const char *policy);
+static ASN1_INTEGER * MS_CALLBACK serial_cb(TS_RESP_CTX *ctx, void *data);
+static ASN1_INTEGER *next_serial(const char *serialfile);
+static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial);
+
+/* Verify related functions. */
+static int verify_command(char *data, char *digest, char *queryfile,
+			  char *in, int token_in,
+			  char *ca_path, char *ca_file, char *untrusted);
+static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest, 
+					char *queryfile, 
+					char *ca_path, char *ca_file,
+					char *untrusted);
+static X509_STORE *create_cert_store(char *ca_path, char *ca_file);
+static int MS_CALLBACK verify_cb(int ok, X509_STORE_CTX *ctx);
+
+/* Main function definition. */
+int MAIN(int, char **);
+
+int MAIN(int argc, char **argv)
+	{
+	int ret = 1;
+	char *configfile = NULL;
+	char *section = NULL;
+	CONF *conf = NULL;
+	enum mode {
+	CMD_NONE, CMD_QUERY, CMD_REPLY, CMD_VERIFY 
+	} mode = CMD_NONE;
+	char *data = NULL;
+	char *digest = NULL;
+	const EVP_MD *md = NULL;
+	char *rnd = NULL;
+	char *policy = NULL;
+	int no_nonce = 0;
+	int cert = 0;
+	char *in = NULL;
+	char *out = NULL;
+	int text = 0;
+	char *queryfile = NULL;
+	char *passin = NULL;	/* Password source. */
+	char *password =NULL;	/* Password itself. */
+	char *inkey = NULL;
+	char *signer = NULL;
+	char *chain = NULL;
+	char *ca_path = NULL;
+	char *ca_file = NULL;
+	char *untrusted = NULL;
+	char *engine = NULL;
+	/* Input is ContentInfo instead of TimeStampResp. */
+	int token_in = 0;	
+	/* Output is ContentInfo instead of TimeStampResp. */
+	int token_out = 0;
+	int free_bio_err = 0;
+
+	ERR_load_crypto_strings();
+	apps_startup();
+
+	if (bio_err == NULL && (bio_err = BIO_new(BIO_s_file())) != NULL)
+		{
+		free_bio_err = 1;
+		BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
+		}
+
+	if (!load_config(bio_err, NULL))
+		goto cleanup;
+
+	for (argc--, argv++; argc > 0; argc--, argv++)
+		{
+		if (strcmp(*argv, "-config") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			configfile = *++argv;
+			}
+		else if (strcmp(*argv, "-section") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			section = *++argv;
+			}
+		else if (strcmp(*argv, "-query") == 0)
+			{
+			if (mode != CMD_NONE) goto usage;
+			mode = CMD_QUERY;
+			}
+		else if (strcmp(*argv, "-data") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			data = *++argv;
+			}
+		else if (strcmp(*argv, "-digest") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			digest = *++argv;
+			}
+		else if (strcmp(*argv, "-rand") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			rnd = *++argv;
+			}
+		else if (strcmp(*argv, "-policy") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			policy = *++argv;
+			}
+		else if (strcmp(*argv, "-no_nonce") == 0)
+			{
+			no_nonce = 1;
+			}
+		else if (strcmp(*argv, "-cert") == 0)
+			{
+			cert = 1;
+			}
+		else if (strcmp(*argv, "-in") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			in = *++argv;
+			}
+		else if (strcmp(*argv, "-token_in") == 0)
+			{
+			token_in = 1;
+			}
+		else if (strcmp(*argv, "-out") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			out = *++argv;
+			}
+		else if (strcmp(*argv, "-token_out") == 0)
+			{
+			token_out = 1;
+			}
+		else if (strcmp(*argv, "-text") == 0)
+			{
+			text = 1;
+			}
+		else if (strcmp(*argv, "-reply") == 0)
+			{
+			if (mode != CMD_NONE) goto usage;
+			mode = CMD_REPLY;
+			}
+		else if (strcmp(*argv, "-queryfile") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			queryfile = *++argv;
+			}
+		else if (strcmp(*argv, "-passin") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			passin = *++argv;
+			}
+		else if (strcmp(*argv, "-inkey") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			inkey = *++argv;
+			}
+		else if (strcmp(*argv, "-signer") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			signer = *++argv;
+			}
+		else if (strcmp(*argv, "-chain") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			chain = *++argv;
+			}
+		else if (strcmp(*argv, "-verify") == 0)
+			{
+			if (mode != CMD_NONE) goto usage;
+			mode = CMD_VERIFY;
+			}
+		else if (strcmp(*argv, "-CApath") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			ca_path = *++argv;
+			}
+		else if (strcmp(*argv, "-CAfile") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			ca_file = *++argv;
+			}
+		else if (strcmp(*argv, "-untrusted") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			untrusted = *++argv;
+			}
+		else if (strcmp(*argv, "-engine") == 0)
+			{
+			if (argc-- < 1) goto usage;
+			engine = *++argv;
+			}
+		else if ((md = EVP_get_digestbyname(*argv + 1)) != NULL)
+			{
+			/* empty. */
+			}
+		else
+			goto usage;
+		}
+	
+	/* Seed the random number generator if it is going to be used. */
+	if (mode == CMD_QUERY && !no_nonce)
+		{
+		if (!app_RAND_load_file(NULL, bio_err, 1) && rnd == NULL)
+			BIO_printf(bio_err, "warning, not much extra random "
+				   "data, consider using the -rand option\n");
+		if (rnd != NULL)
+			BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
+				   app_RAND_load_files(rnd));
+		}
+
+	/* Get the password if required. */
+	if(mode == CMD_REPLY && passin &&
+	   !app_passwd(bio_err, passin, NULL, &password, NULL))
+		{
+		BIO_printf(bio_err,"Error getting password.\n");
+		goto cleanup;
+		}
+
+	/* Check consistency of parameters and execute 
+	   the appropriate function. */
+	switch (mode)
+		{
+	case CMD_NONE:
+		goto usage;
+	case CMD_QUERY:
+		/* Data file and message imprint cannot be specified
+		   at the same time. */
+		ret = data != NULL && digest != NULL;
+		if (ret) goto usage;
+		/* Load the config file for possible policy OIDs. */
+		conf = load_config_file(configfile);
+		ret = !query_command(data, digest, md, policy, no_nonce, cert,
+				     in, out, text);
+		break;
+	case CMD_REPLY:
+		conf = load_config_file(configfile);
+		if (in == NULL)
+			{
+			ret = !(queryfile != NULL && conf != NULL && !token_in);
+			if (ret) goto usage;
+			}
+		else
+			{
+			/* 'in' and 'queryfile' are exclusive. */
+			ret = !(queryfile == NULL);
+			if (ret) goto usage;
+			}
+
+		ret = !reply_command(conf, section, engine, queryfile, 
+				     password, inkey, signer, chain, policy, 
+				     in, token_in, out, token_out, text);
+		break;
+	case CMD_VERIFY:
+		ret = !(((queryfile && !data && !digest)
+			 || (!queryfile && data && !digest)
+			 || (!queryfile && !data && digest))
+			&& in != NULL);
+		if (ret) goto usage;
+
+		ret = !verify_command(data, digest, queryfile, in, token_in,
+				      ca_path, ca_file, untrusted);
+		}
+
+	goto cleanup;
+
+ usage:
+	BIO_printf(bio_err, "usage:\n"
+		   "ts -query [-rand file%cfile%c...] [-config configfile] "
+		   "[-data file_to_hash] [-digest digest_bytes]"
+		   "[-md2|-md4|-md5|-sha|-sha1|-mdc2|-ripemd160] "
+		   "[-policy object_id] [-no_nonce] [-cert] "
+		   "[-in request.tsq] [-out request.tsq] [-text]\n",
+		   LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
+	BIO_printf(bio_err, "or\n"
+		   "ts -reply [-config configfile] [-section tsa_section] "
+		   "[-queryfile request.tsq] [-passin password] "
+		   "[-signer tsa_cert.pem] [-inkey private_key.pem] "
+		   "[-chain certs_file.pem] [-policy object_id] "
+		   "[-in response.tsr] [-token_in] "
+		   "[-out response.tsr] [-token_out] [-text] [-engine id]\n");
+	BIO_printf(bio_err, "or\n"
+		   "ts -verify [-data file_to_hash] [-digest digest_bytes] "
+		   "[-queryfile request.tsq] "
+		   "-in response.tsr [-token_in] "
+		   "-CApath ca_path -CAfile ca_file.pem "
+		   "-untrusted cert_file.pem\n");
+ cleanup:
+	/* Clean up. */
+	app_RAND_write_file(NULL, bio_err);
+	NCONF_free(conf);
+	OPENSSL_free(password);
+	OBJ_cleanup();
+	if (free_bio_err)
+		{
+		BIO_free_all(bio_err);
+		bio_err = NULL;
+		}
+
+	OPENSSL_EXIT(ret);
+	}
+
+/*
+ * Configuration file-related function definitions.
+ */
+
+static ASN1_OBJECT *txt2obj(const char *oid)
+	{
+	ASN1_OBJECT *oid_obj = NULL;
+
+	if (!(oid_obj = OBJ_txt2obj(oid, 0)))
+		BIO_printf(bio_err, "cannot convert %s to OID\n", oid);
+
+	return oid_obj;
+	}
+
+static CONF *load_config_file(const char *configfile)
+	{
+	CONF *conf = NULL;
+	long errorline = -1;
+
+	if (!configfile) configfile = getenv("OPENSSL_CONF");
+	if (!configfile) configfile = getenv("SSLEAY_CONF");
+
+	if (configfile &&
+	    (!(conf = NCONF_new(NULL)) ||
+	     NCONF_load(conf, configfile, &errorline) <= 0))
+		{
+		if (errorline <= 0)
+			BIO_printf(bio_err, "error loading the config file "
+				   "'%s'\n", configfile);
+		else
+			BIO_printf(bio_err, "error on line %ld of config file "
+				   "'%s'\n", errorline, configfile);
+		}
+
+	if (conf != NULL)
+		{
+		const char *p;
+
+		BIO_printf(bio_err,"Using configuration from %s\n", configfile);
+		p = NCONF_get_string(conf, NULL, ENV_OID_FILE);
+		if (p != NULL)
+			{
+			BIO *oid_bio = BIO_new_file(p, "r");
+			if (!oid_bio) 
+				ERR_print_errors(bio_err);
+			else
+				{
+				OBJ_create_objects(oid_bio);
+				BIO_free_all(oid_bio);
+				}
+			}
+		else
+			ERR_clear_error();
+		if(!add_oid_section(bio_err, conf)) 
+			ERR_print_errors(bio_err);
+		}
+	return conf;
+	}
+
+/*
+ * Query-related method definitions.
+ */
+
+static int query_command(const char *data, char *digest, const EVP_MD *md,
+			 const char *policy, int no_nonce, 
+			 int cert, const char *in, const char *out, int text)
+	{
+	int ret = 0;
+	TS_REQ *query = NULL;
+	BIO *in_bio = NULL;
+	BIO *data_bio = NULL;
+	BIO *out_bio = NULL;
+
+	/* Build query object either from file or from scratch. */
+	if (in != NULL)
+		{
+		if ((in_bio = BIO_new_file(in, "rb")) == NULL) goto end;
+		query = d2i_TS_REQ_bio(in_bio, NULL);
+		}
+	else
+		{
+		/* Open the file if no explicit digest bytes were specified. */
+		if (!digest 
+		    && !(data_bio = BIO_open_with_default(data, "rb", stdin)))
+			goto end;
+		/* Creating the query object. */
+		query = create_query(data_bio, digest, md,
+				     policy, no_nonce, cert);
+		/* Saving the random number generator state. */
+		}
+	if (query == NULL) goto end;
+
+	/* Write query either in ASN.1 or in text format. */
+	if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL)
+		goto end;
+	if (text)
+		{
+		/* Text output. */
+		if (!TS_REQ_print_bio(out_bio, query))
+			goto end;
+		}
+	else
+		{
+		/* ASN.1 output. */
+		if (!i2d_TS_REQ_bio(out_bio, query))
+			goto end;
+		}
+
+	ret = 1;
+
+ end:
+	ERR_print_errors(bio_err);
+
+	/* Clean up. */
+	BIO_free_all(in_bio);
+	BIO_free_all(data_bio);
+	BIO_free_all(out_bio);
+	TS_REQ_free(query);
+
+	return ret;
+	}
+
+static BIO *BIO_open_with_default(const char *file, const char *mode, 
+				  FILE *default_fp)
+	{
+	return file == NULL ? 
+		BIO_new_fp(default_fp, BIO_NOCLOSE) 
+		: BIO_new_file(file, mode);
+	}
+
+static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md,
+			    const char *policy, int no_nonce, int cert)
+	{
+	int ret = 0;
+	TS_REQ *ts_req = NULL;
+	int len;
+	TS_MSG_IMPRINT *msg_imprint = NULL;
+	X509_ALGOR *algo = NULL;
+	unsigned char *data = NULL;
+	ASN1_OBJECT *policy_obj = NULL;
+	ASN1_INTEGER *nonce_asn1 = NULL;
+
+	/* Setting default message digest. */
+	if (!md && !(md = EVP_get_digestbyname("sha1"))) goto err;
+
+	/* Creating request object. */
+	if (!(ts_req = TS_REQ_new())) goto err;
+
+	/* Setting version. */
+	if (!TS_REQ_set_version(ts_req, 1)) goto err;
+
+	/* Creating and adding MSG_IMPRINT object. */
+	if (!(msg_imprint = TS_MSG_IMPRINT_new())) goto err;
+
+	/* Adding algorithm. */
+	if (!(algo = X509_ALGOR_new())) goto err;
+	if (!(algo->algorithm = OBJ_nid2obj(EVP_MD_type(md)))) goto err;
+	if (!(algo->parameter = ASN1_TYPE_new())) goto err;
+	algo->parameter->type = V_ASN1_NULL;
+	if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo)) goto err;
+
+	/* Adding message digest. */
+	if ((len = create_digest(data_bio, digest, md, &data)) == 0)
+		goto err;
+	if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len)) goto err;
+
+	if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint)) goto err;
+	
+	/* Setting policy if requested. */
+	if (policy && !(policy_obj = txt2obj(policy))) goto err;
+	if (policy_obj && !TS_REQ_set_policy_id(ts_req, policy_obj)) goto err;
+
+	/* Setting nonce if requested. */
+	if (!no_nonce && !(nonce_asn1 = create_nonce(NONCE_LENGTH))) goto err;
+	if (nonce_asn1 && !TS_REQ_set_nonce(ts_req, nonce_asn1)) goto err;
+
+	/* Setting certificate request flag if requested. */
+	if (!TS_REQ_set_cert_req(ts_req, cert)) goto err;
+
+	ret = 1;
+ err:
+	if (!ret)
+		{
+		TS_REQ_free(ts_req);
+		ts_req = NULL;
+		BIO_printf(bio_err, "could not create query\n");
+		}
+	TS_MSG_IMPRINT_free(msg_imprint);
+	X509_ALGOR_free(algo);
+	OPENSSL_free(data);
+	ASN1_OBJECT_free(policy_obj);
+	ASN1_INTEGER_free(nonce_asn1);
+	return ts_req;
+	}
+
+static int create_digest(BIO *input, char *digest, const EVP_MD *md,
+			 unsigned char **md_value)
+	{
+	int md_value_len;
+
+	md_value_len = EVP_MD_size(md);
+	if (md_value_len < 0)
+	    goto err;
+	if (input)
+		{
+		/* Digest must be computed from an input file. */
+		EVP_MD_CTX md_ctx;
+		unsigned char buffer[4096];
+		int length;
+
+		*md_value = OPENSSL_malloc(md_value_len);
+		if (*md_value == 0) goto err;
+
+		EVP_DigestInit(&md_ctx, md);
+		while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0)
+			{
+			EVP_DigestUpdate(&md_ctx, buffer, length);
+			}
+		EVP_DigestFinal(&md_ctx, *md_value, NULL);
+		}
+	else
+		{
+		/* Digest bytes are specified with digest. */
+		long digest_len;
+		*md_value = string_to_hex(digest, &digest_len);
+		if (!*md_value || md_value_len != digest_len)
+			{
+			OPENSSL_free(*md_value);
+			*md_value = NULL;
+			BIO_printf(bio_err, "bad digest, %d bytes "
+				   "must be specified\n", md_value_len);
+			goto err;
+			}
+		}
+
+	return md_value_len;
+ err:
+	return 0;
+	}
+
+static ASN1_INTEGER *create_nonce(int bits)
+	{
+	unsigned char buf[20];
+	ASN1_INTEGER *nonce = NULL;
+	int len = (bits - 1) / 8 + 1;
+	int i;
+
+	/* Generating random byte sequence. */
+	if (len > (int)sizeof(buf)) goto err;
+	if (RAND_bytes(buf, len) <= 0) goto err;
+
+	/* Find the first non-zero byte and creating ASN1_INTEGER object. */
+	for (i = 0; i < len && !buf[i]; ++i);
+	if (!(nonce = ASN1_INTEGER_new())) goto err;
+	OPENSSL_free(nonce->data);
+	/* Allocate at least one byte. */
+	nonce->length = len - i;
+	if (!(nonce->data = OPENSSL_malloc(nonce->length + 1))) goto err;
+	memcpy(nonce->data, buf + i, nonce->length);
+
+	return nonce;
+ err:
+	BIO_printf(bio_err, "could not create nonce\n");
+	ASN1_INTEGER_free(nonce);
+	return NULL;
+	}
+/*
+ * Reply-related method definitions.
+ */
+
+static int reply_command(CONF *conf, char *section, char *engine, 
+			 char *queryfile, char *passin, char *inkey,
+			 char *signer, char *chain, const char *policy, 
+			 char *in, int token_in,
+			 char *out, int token_out, int text)
+	{
+	int ret = 0;
+	TS_RESP *response = NULL;
+	BIO *in_bio = NULL;
+	BIO *query_bio = NULL;
+	BIO *inkey_bio = NULL;
+	BIO *signer_bio = NULL;
+	BIO *out_bio = NULL;
+
+	/* Build response object either from response or query. */
+	if (in != NULL)
+		{
+		if ((in_bio = BIO_new_file(in, "rb")) == NULL) goto end;
+		if (token_in)
+			{
+			/* We have a ContentInfo (PKCS7) object, add
+			   'granted' status info around it. */
+			response = read_PKCS7(in_bio);
+			}
+		else
+			{
+			/* We have a ready-made TS_RESP object. */
+			response = d2i_TS_RESP_bio(in_bio, NULL);
+			}
+		}
+	else
+		{
+		response = create_response(conf, section, engine, queryfile,
+					   passin, inkey, signer, chain,
+					   policy);
+		if (response)
+			BIO_printf(bio_err, "Response has been generated.\n");
+		else
+			BIO_printf(bio_err, "Response is not generated.\n");
+		}
+	if (response == NULL) goto end;
+
+	/* Write response either in ASN.1 or text format. */
+	if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL)
+		goto end;
+	if (text)
+		{
+		/* Text output. */
+		if (token_out)
+			{
+			TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
+			if (!TS_TST_INFO_print_bio(out_bio, tst_info)) goto end;
+			}
+		else
+			{
+			if (!TS_RESP_print_bio(out_bio, response)) goto end;
+			}
+		}
+	else
+		{
+		/* ASN.1 DER output. */
+		if (token_out)
+			{
+			PKCS7 *token = TS_RESP_get_token(response);
+			if (!i2d_PKCS7_bio(out_bio, token)) goto end;
+			}
+		else
+			{
+			if (!i2d_TS_RESP_bio(out_bio, response)) goto end;
+			}
+		}
+
+	ret = 1;
+
+ end:
+	ERR_print_errors(bio_err);
+
+	/* Clean up. */
+	BIO_free_all(in_bio);
+	BIO_free_all(query_bio);
+	BIO_free_all(inkey_bio);
+	BIO_free_all(signer_bio);
+	BIO_free_all(out_bio);
+	TS_RESP_free(response);
+
+	return ret;
+	}
+
+/* Reads a PKCS7 token and adds default 'granted' status info to it. */
+static TS_RESP *read_PKCS7(BIO *in_bio)
+	{
+	int ret = 0;
+	PKCS7 *token = NULL;
+	TS_TST_INFO *tst_info = NULL;
+	TS_RESP *resp = NULL;
+	TS_STATUS_INFO *si = NULL;
+
+	/* Read PKCS7 object and extract the signed time stamp info. */
+	if (!(token = d2i_PKCS7_bio(in_bio, NULL))) goto end;
+	if (!(tst_info = PKCS7_to_TS_TST_INFO(token))) goto end;
+
+	/* Creating response object. */
+	if (!(resp = TS_RESP_new())) goto end;
+
+	/* Create granted status info. */
+	if (!(si = TS_STATUS_INFO_new())) goto end;
+	if (!(ASN1_INTEGER_set(si->status, TS_STATUS_GRANTED))) goto end;
+	if (!TS_RESP_set_status_info(resp, si)) goto end;
+
+	/* Setting encapsulated token. */
+	TS_RESP_set_tst_info(resp, token, tst_info);
+	token = NULL;		/* Ownership is lost. */
+	tst_info = NULL;	/* Ownership is lost. */
+
+	ret = 1;
+ end:
+	PKCS7_free(token);
+	TS_TST_INFO_free(tst_info);
+	if (!ret)
+		{
+		TS_RESP_free(resp);
+		resp = NULL;
+		}
+	TS_STATUS_INFO_free(si);
+	return resp;
+	}
+
+static TS_RESP *create_response(CONF *conf, const char *section, char *engine, 
+				char *queryfile, char *passin, char *inkey,
+				char *signer, char *chain, const char *policy)
+	{
+	int ret = 0;
+	TS_RESP *response = NULL;
+	BIO *query_bio = NULL;
+	TS_RESP_CTX *resp_ctx = NULL;
+
+	if (!(query_bio = BIO_new_file(queryfile, "rb")))
+		goto end;
+
+	/* Getting TSA configuration section. */
+	if (!(section = TS_CONF_get_tsa_section(conf, section)))
+		goto end;
+
+	/* Setting up response generation context. */
+	if (!(resp_ctx = TS_RESP_CTX_new())) goto end;
+
+	/* Setting serial number provider callback. */
+	if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx)) goto end;
+#ifndef OPENSSL_NO_ENGINE
+	/* Setting default OpenSSL engine. */
+	if (!TS_CONF_set_crypto_device(conf, section, engine)) goto end;
+#endif
+
+	/* Setting TSA signer certificate. */
+	if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx)) goto end;
+
+	/* Setting TSA signer certificate chain. */
+	if (!TS_CONF_set_certs(conf, section, chain, resp_ctx)) goto end;
+
+	/* Setting TSA signer private key. */
+	if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx))
+		goto end;
+
+	/* Setting default policy OID. */
+	if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx)) goto end;
+
+	/* Setting acceptable policy OIDs. */
+	if (!TS_CONF_set_policies(conf, section, resp_ctx)) goto end;
+
+	/* Setting the acceptable one-way hash algorithms. */
+	if (!TS_CONF_set_digests(conf, section, resp_ctx)) goto end;
+
+	/* Setting guaranteed time stamp accuracy. */
+	if (!TS_CONF_set_accuracy(conf, section, resp_ctx)) goto end;
+
+	/* Setting the precision of the time. */
+	if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx))
+		goto end;
+
+	/* Setting the ordering flaf if requested. */
+	if (!TS_CONF_set_ordering(conf, section, resp_ctx)) goto end;
+
+	/* Setting the TSA name required flag if requested. */
+	if (!TS_CONF_set_tsa_name(conf, section, resp_ctx)) goto end;
+
+	/* Setting the ESS cert id chain flag if requested. */
+	if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx)) goto end;
+
+	/* Creating the response. */
+	if (!(response = TS_RESP_create_response(resp_ctx, query_bio)))
+		goto end;
+
+	ret = 1;
+ end:
+	if (!ret) 
+		{
+		TS_RESP_free(response);
+		response = NULL;
+		}
+	TS_RESP_CTX_free(resp_ctx);
+	BIO_free_all(query_bio);
+
+	return response;
+	}
+
+static ASN1_INTEGER * MS_CALLBACK serial_cb(TS_RESP_CTX *ctx, void *data)
+	{
+	const char *serial_file = (const char *) data;
+	ASN1_INTEGER *serial = next_serial(serial_file);
+
+	if (!serial)
+		{
+		TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+					    "Error during serial number "
+					    "generation.");
+		TS_RESP_CTX_add_failure_info(ctx,
+					     TS_INFO_ADD_INFO_NOT_AVAILABLE);
+		}
+	else
+		save_ts_serial(serial_file, serial);
+
+	return serial;
+	}
+
+static ASN1_INTEGER *next_serial(const char *serialfile)
+	{
+	int ret = 0;
+	BIO *in = NULL;
+	ASN1_INTEGER *serial = NULL;
+	BIGNUM *bn = NULL;
+
+	if (!(serial = ASN1_INTEGER_new())) goto err;
+
+	if (!(in = BIO_new_file(serialfile, "r"))) 
+		{
+		ERR_clear_error();
+		BIO_printf(bio_err, "Warning: could not open file %s for "
+			   "reading, using serial number: 1\n", serialfile);
+		if (!ASN1_INTEGER_set(serial, 1)) goto err;
+		}
+	else
+		{
+		char buf[1024];
+		if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf)))
+			{
+			BIO_printf(bio_err, "unable to load number from %s\n",
+				   serialfile);
+			goto err;
+			}
+		if (!(bn = ASN1_INTEGER_to_BN(serial, NULL))) goto err;
+		ASN1_INTEGER_free(serial);
+		serial = NULL;
+		if (!BN_add_word(bn, 1)) goto err;
+		if (!(serial = BN_to_ASN1_INTEGER(bn, NULL))) goto err;
+		}
+	ret = 1;
+ err:
+	if (!ret)
+		{
+		ASN1_INTEGER_free(serial);
+		serial = NULL;
+		}
+	BIO_free_all(in);
+	BN_free(bn);
+	return serial;
+	}
+
+static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial)
+	{
+	int ret = 0;
+	BIO *out = NULL;
+
+	if (!(out = BIO_new_file(serialfile, "w"))) goto err;
+	if (i2a_ASN1_INTEGER(out, serial) <= 0) goto err;
+	if (BIO_puts(out, "\n") <= 0) goto err;
+	ret = 1;
+ err:
+	if (!ret)
+		BIO_printf(bio_err, "could not save serial number to %s\n",
+			   serialfile);
+	BIO_free_all(out);
+	return ret;
+	}
+
+/*
+ * Verify-related method definitions.
+ */
+
+static int verify_command(char *data, char *digest, char *queryfile,
+			  char *in, int token_in,
+			  char *ca_path, char *ca_file, char *untrusted)
+	{
+	BIO *in_bio = NULL;
+	PKCS7 *token = NULL;
+	TS_RESP *response = NULL;
+	TS_VERIFY_CTX *verify_ctx = NULL;
+	int ret = 0;
+
+	/* Decode the token (PKCS7) or response (TS_RESP) files. */
+	if (!(in_bio = BIO_new_file(in, "rb"))) goto end;
+	if (token_in)
+		{
+		if (!(token = d2i_PKCS7_bio(in_bio, NULL))) goto end;
+		}
+	else
+		{
+		if (!(response = d2i_TS_RESP_bio(in_bio, NULL))) goto end;
+		}
+
+	if (!(verify_ctx = create_verify_ctx(data, digest, queryfile, 
+					     ca_path, ca_file, untrusted)))
+		goto end;
+
+	/* Checking the token or response against the request. */
+	ret = token_in ?
+		TS_RESP_verify_token(verify_ctx, token) :
+		TS_RESP_verify_response(verify_ctx, response);
+
+ end:
+	printf("Verification: ");
+	if (ret)
+		printf("OK\n");
+	else
+		{
+		printf("FAILED\n");
+		/* Print errors, if there are any. */
+		ERR_print_errors(bio_err);
+		}
+	
+	/* Clean up. */
+	BIO_free_all(in_bio);
+	PKCS7_free(token);
+	TS_RESP_free(response);
+	TS_VERIFY_CTX_free(verify_ctx);
+	return ret;
+	}
+
+static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest, 
+					char *queryfile, 
+					char *ca_path, char *ca_file,
+					char *untrusted)
+	{
+	TS_VERIFY_CTX *ctx = NULL;
+	BIO *input = NULL;
+	TS_REQ *request = NULL;
+	int ret = 0;
+
+	if (data != NULL || digest != NULL)
+		{
+		if (!(ctx = TS_VERIFY_CTX_new())) goto err;
+		ctx->flags = TS_VFY_VERSION | TS_VFY_SIGNER;
+		if (data != NULL)
+			{
+			ctx->flags |= TS_VFY_DATA;
+			if (!(ctx->data = BIO_new_file(data, "rb"))) goto err;
+			}
+		else if (digest != NULL)
+			{
+			long imprint_len;
+			ctx->flags |= TS_VFY_IMPRINT;
+			if (!(ctx->imprint = string_to_hex(digest,
+							   &imprint_len)))
+				{
+				BIO_printf(bio_err, "invalid digest string\n");
+				goto err;
+				}
+			ctx->imprint_len = imprint_len;
+			}
+		
+		}
+	else if (queryfile != NULL)
+		{
+		/* The request has just to be read, decoded and converted to
+		   a verify context object. */
+		if (!(input = BIO_new_file(queryfile, "rb"))) goto err;
+		if (!(request = d2i_TS_REQ_bio(input, NULL))) goto err;
+		if (!(ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL))) goto err;
+		}
+	else
+		return NULL;
+
+	/* Add the signature verification flag and arguments. */
+	ctx->flags |= TS_VFY_SIGNATURE;
+
+	/* Initialising the X509_STORE object. */
+	if (!(ctx->store = create_cert_store(ca_path, ca_file))) goto err;
+
+	/* Loading untrusted certificates. */
+	if (untrusted && !(ctx->certs = TS_CONF_load_certs(untrusted))) 
+		goto err;
+
+	ret = 1;
+ err:
+	if (!ret)
+		{
+		TS_VERIFY_CTX_free(ctx);
+		ctx = NULL;
+		}
+	BIO_free_all(input);
+	TS_REQ_free(request);
+	return ctx;
+	}
+
+static X509_STORE *create_cert_store(char *ca_path, char *ca_file)
+	{
+	X509_STORE *cert_ctx = NULL;
+	X509_LOOKUP *lookup = NULL;
+	int i;
+
+	/* Creating the X509_STORE object. */
+	cert_ctx = X509_STORE_new();
+
+	/* Setting the callback for certificate chain verification. */
+	X509_STORE_set_verify_cb(cert_ctx, verify_cb);
+
+	/* Adding a trusted certificate directory source. */
+	if (ca_path)
+		{
+		lookup = X509_STORE_add_lookup(cert_ctx,
+					       X509_LOOKUP_hash_dir());
+		if (lookup == NULL)
+			{
+			BIO_printf(bio_err, "memory allocation failure\n");
+			goto err;
+			}
+		i = X509_LOOKUP_add_dir(lookup, ca_path, X509_FILETYPE_PEM);
+		if (!i)
+			{
+			BIO_printf(bio_err, "Error loading directory %s\n",
+				   ca_path);
+			goto err;
+			}
+		}
+
+	/* Adding a trusted certificate file source. */
+	if (ca_file)
+		{
+		lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file());
+		if (lookup == NULL)
+			{
+			BIO_printf(bio_err, "memory allocation failure\n");
+			goto err;
+			}
+		i = X509_LOOKUP_load_file(lookup, ca_file, X509_FILETYPE_PEM);
+		if (!i)
+			{
+			BIO_printf(bio_err, "Error loading file %s\n", ca_file);
+			goto err;
+			}
+		}
+
+	return cert_ctx;
+ err:
+	X509_STORE_free(cert_ctx);
+	return NULL;
+	}
+
+static int MS_CALLBACK verify_cb(int ok, X509_STORE_CTX *ctx)
+	{
+	/*
+	char buf[256];
+
+	if (!ok)
+		{
+		X509_NAME_oneline(X509_get_subject_name(ctx->current_cert),
+				  buf, sizeof(buf));
+		printf("%s\n", buf);
+		printf("error %d at %d depth lookup: %s\n",
+		       ctx->error, ctx->error_depth,
+			X509_verify_cert_error_string(ctx->error));
+		}
+	*/
+
+	return ok;
+	}