Upgrade chrome's OpenSSL to same version Android ships with.

openssl/crypto/ts/ts_rsp_sign.c

+/* crypto/ts/ts_resp_sign.c */
+/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
+ * project 2002.
+ */
+/* ====================================================================
+ * 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 "cryptlib.h"
+
+#if defined(OPENSSL_SYS_UNIX)
+#include <sys/time.h>
+#endif
+
+#include <openssl/objects.h>
+#include <openssl/ts.h>
+#include <openssl/pkcs7.h>
+
+/* Private function declarations. */
+
+static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
+static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
+static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
+
+static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
+static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
+static int TS_RESP_check_request(TS_RESP_CTX *ctx);
+static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
+static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 
+                                            ASN1_OBJECT *policy);
+static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
+static int TS_RESP_sign(TS_RESP_CTX *ctx);
+
+static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 
+                                                   STACK_OF(X509) *certs);
+static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
+static int TS_TST_INFO_content_new(PKCS7 *p7);
+static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
+
+static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
+        ASN1_GENERALIZEDTIME *, long, long, unsigned);
+
+/* Default callbacks for response generation. */
+
+static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
+        {
+        ASN1_INTEGER *serial = ASN1_INTEGER_new();
+        if (!serial) goto err;
+        if (!ASN1_INTEGER_set(serial, 1)) goto err;
+        return serial;
+ err:
+        TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
+        TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                    "Error during serial number generation.");
+        return NULL;
+        }
+
+#if defined(OPENSSL_SYS_UNIX)
+
+/* Use the gettimeofday function call. */
+static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 
+                       long *sec, long *usec)
+        {
+        struct timeval tv;
+        if (gettimeofday(&tv, NULL) != 0) 
+                {
+                TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Time is not available.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
+                return 0;
+                }
+        /* Return time to caller. */
+        *sec = tv.tv_sec;
+        *usec = tv.tv_usec;
+
+        return 1;
+        }
+
+#else
+
+/* Use the time function call that provides only seconds precision. */
+static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 
+                       long *sec, long *usec)
+        {
+        time_t t;
+        if (time(&t) == (time_t) -1)
+                {
+                TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Time is not available.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
+                return 0;
+                }
+        /* Return time to caller, only second precision. */
+        *sec = (long) t;
+        *usec = 0;
+
+        return 1;
+        }
+
+#endif
+
+static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
+                            void *data)
+        {
+        /* No extensions are processed here. */
+        TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                    "Unsupported extension.");
+        TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
+        return 0;
+        }
+
+/* TS_RESP_CTX management functions. */
+
+TS_RESP_CTX *TS_RESP_CTX_new()
+        {
+        TS_RESP_CTX *ctx;
+
+        if (!(ctx = (TS_RESP_CTX *) OPENSSL_malloc(sizeof(TS_RESP_CTX))))
+                {
+                TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
+                return NULL;
+                }
+        memset(ctx, 0, sizeof(TS_RESP_CTX));
+
+        /* Setting default callbacks. */
+        ctx->serial_cb = def_serial_cb;
+        ctx->time_cb = def_time_cb;
+        ctx->extension_cb = def_extension_cb;
+
+        return ctx;
+        }
+
+void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
+        {
+        if (!ctx) return;
+
+        X509_free(ctx->signer_cert);
+        EVP_PKEY_free(ctx->signer_key);
+        sk_X509_pop_free(ctx->certs, X509_free);
+        sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
+        ASN1_OBJECT_free(ctx->default_policy);
+        sk_EVP_MD_free(ctx->mds);       /* No EVP_MD_free method exists. */
+        ASN1_INTEGER_free(ctx->seconds);
+        ASN1_INTEGER_free(ctx->millis);
+        ASN1_INTEGER_free(ctx->micros);
+        OPENSSL_free(ctx);
+        }
+
+int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
+        {
+        if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1)
+                {
+                TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 
+                      TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
+                return 0;
+                }
+        if (ctx->signer_cert) X509_free(ctx->signer_cert);
+        ctx->signer_cert = signer;
+        CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
+        return 1;
+        }
+
+int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
+        {
+        if (ctx->signer_key) EVP_PKEY_free(ctx->signer_key);
+        ctx->signer_key = key;
+        CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
+
+        return 1;
+        }
+
+int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
+        {
+        if (ctx->default_policy) ASN1_OBJECT_free(ctx->default_policy);
+        if (!(ctx->default_policy = OBJ_dup(def_policy))) goto err;
+        return 1;
+ err:
+        TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
+        return 0;
+        }
+
+int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
+        {
+        int i;
+
+        if (ctx->certs)
+                {
+                sk_X509_pop_free(ctx->certs, X509_free);
+                ctx->certs = NULL;
+                }
+        if (!certs) return 1;
+        if (!(ctx->certs = sk_X509_dup(certs))) 
+                {
+                TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
+                return 0;
+                }
+        for (i = 0; i < sk_X509_num(ctx->certs); ++i)
+                {
+                X509 *cert = sk_X509_value(ctx->certs, i);
+                CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
+                }
+
+        return 1;
+        }
+
+int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
+        {
+        ASN1_OBJECT *copy = NULL;
+
+        /* Create new policy stack if necessary. */
+        if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 
+                goto err;
+        if (!(copy = OBJ_dup(policy))) goto err;
+        if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) goto err;
+
+        return 1;
+ err:
+        TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
+        ASN1_OBJECT_free(copy);
+        return 0;
+        }
+
+int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
+        {
+        /* Create new md stack if necessary. */
+        if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 
+                goto err;
+        /* Add the shared md, no copy needed. */
+        if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) goto err;
+
+        return 1;
+ err:
+        TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
+        return 0;
+        }
+
+#define TS_RESP_CTX_accuracy_free(ctx)          \
+        ASN1_INTEGER_free(ctx->seconds);        \
+        ctx->seconds = NULL;                    \
+        ASN1_INTEGER_free(ctx->millis);         \
+        ctx->millis = NULL;                     \
+        ASN1_INTEGER_free(ctx->micros);         \
+        ctx->micros = NULL;
+
+int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 
+                             int secs, int millis, int micros)
+        {
+
+        TS_RESP_CTX_accuracy_free(ctx);
+        if (secs && (!(ctx->seconds = ASN1_INTEGER_new())
+                     || !ASN1_INTEGER_set(ctx->seconds, secs)))
+                goto err;
+        if (millis && (!(ctx->millis = ASN1_INTEGER_new())
+                       || !ASN1_INTEGER_set(ctx->millis, millis)))
+                goto err;
+        if (micros && (!(ctx->micros = ASN1_INTEGER_new())
+                       || !ASN1_INTEGER_set(ctx->micros, micros)))
+                goto err;
+
+        return 1;
+ err:
+        TS_RESP_CTX_accuracy_free(ctx);
+        TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
+        return 0;
+        }
+
+void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
+        {
+        ctx->flags |= flags;
+        }
+
+void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
+        {
+        ctx->serial_cb = cb;
+        ctx->serial_cb_data = data;
+        }
+
+void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
+        {
+        ctx->time_cb = cb;
+        ctx->time_cb_data = data;
+        }
+
+void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 
+                                  TS_extension_cb cb, void *data)
+        {
+        ctx->extension_cb = cb;
+        ctx->extension_cb_data = data;
+        }
+
+int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 
+                                int status, const char *text)
+        {
+        TS_STATUS_INFO *si = NULL;
+        ASN1_UTF8STRING *utf8_text = NULL;
+        int ret = 0;
+
+        if (!(si = TS_STATUS_INFO_new())) goto err;
+        if (!ASN1_INTEGER_set(si->status, status)) goto err;
+        if (text)
+                {
+                if (!(utf8_text = ASN1_UTF8STRING_new())
+                    || !ASN1_STRING_set(utf8_text, text, strlen(text)))
+                        goto err;
+                if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
+                        goto err;
+                if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) goto err;
+                utf8_text = NULL;       /* Ownership is lost. */
+                }
+        if (!TS_RESP_set_status_info(ctx->response, si)) goto err;
+        ret = 1;
+ err:
+        if (!ret)
+                TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
+        TS_STATUS_INFO_free(si);
+        ASN1_UTF8STRING_free(utf8_text);
+        return ret;
+        }
+
+int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 
+                                     int status, const char *text)
+        {
+        int ret = 1;
+        TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
+
+        if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED)
+                {
+                /* Status has not been set, set it now. */
+                ret = TS_RESP_CTX_set_status_info(ctx, status, text);
+                }
+        return ret;
+        }
+
+int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
+        {
+        TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
+        if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
+                goto err;
+        if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
+                goto err;
+        return 1;
+ err:
+        TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
+        return 0;
+        }
+
+TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
+        {
+        return ctx->request;
+        }
+
+TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
+        {
+        return ctx->tst_info;
+        }
+
+int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
+       {
+       if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
+               return 0;
+       ctx->clock_precision_digits = precision;
+       return 1;
+       }
+
+/* Main entry method of the response generation. */
+TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
+        {
+        ASN1_OBJECT *policy;
+        TS_RESP *response;
+        int result = 0;
+
+        TS_RESP_CTX_init(ctx);
+
+        /* Creating the response object. */
+        if (!(ctx->response = TS_RESP_new())) 
+                {
+                TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
+                goto end;
+                }
+
+        /* Parsing DER request. */
+        if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL)))
+                {
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Bad request format or "
+                                            "system error.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
+                goto end;
+                }
+
+        /* Setting default status info. */
+        if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
+                goto end;
+
+        /* Checking the request format. */
+        if (!TS_RESP_check_request(ctx)) goto end;
+
+        /* Checking acceptable policies. */
+        if (!(policy = TS_RESP_get_policy(ctx))) goto end;
+
+        /* Creating the TS_TST_INFO object. */
+        if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
+                goto end;
+
+        /* Processing extensions. */
+        if (!TS_RESP_process_extensions(ctx)) goto end;
+
+        /* Generating the signature. */
+        if (!TS_RESP_sign(ctx)) goto end;
+
+        /* Everything was successful. */
+        result = 1;
+ end:
+        if (!result)
+                {
+                TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
+                if (ctx->response != NULL)
+                        {
+                        if (TS_RESP_CTX_set_status_info_cond(ctx,
+                                TS_STATUS_REJECTION, "Error during response "
+                                "generation.") == 0)
+                                {
+                                TS_RESP_free(ctx->response);
+                                ctx->response = NULL;
+                                }
+                        }
+                }
+        response = ctx->response;
+        ctx->response = NULL;   /* Ownership will be returned to caller. */
+        TS_RESP_CTX_cleanup(ctx);
+        return response;
+        }
+
+/* Initializes the variable part of the context. */
+static void TS_RESP_CTX_init(TS_RESP_CTX *ctx)
+        {
+        ctx->request = NULL;
+        ctx->response = NULL;
+        ctx->tst_info = NULL;
+        }
+
+/* Cleans up the variable part of the context. */
+static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
+        {
+        TS_REQ_free(ctx->request);
+        ctx->request = NULL;
+        TS_RESP_free(ctx->response);
+        ctx->response = NULL;
+        TS_TST_INFO_free(ctx->tst_info);
+        ctx->tst_info = NULL;
+        }
+
+/* Checks the format and content of the request. */
+static int TS_RESP_check_request(TS_RESP_CTX *ctx)
+        {
+        TS_REQ *request = ctx->request;
+        TS_MSG_IMPRINT *msg_imprint;
+        X509_ALGOR *md_alg;
+        int md_alg_id;
+        const ASN1_OCTET_STRING *digest;
+        EVP_MD *md = NULL;
+        int i;
+
+        /* Checking request version. */
+        if (TS_REQ_get_version(request) != 1)
+                {
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Bad request version.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
+                return 0;
+                }
+
+        /* Checking message digest algorithm. */
+        msg_imprint = TS_REQ_get_msg_imprint(request);
+        md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
+        md_alg_id = OBJ_obj2nid(md_alg->algorithm);
+        for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i)
+                {
+                EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
+                if (md_alg_id == EVP_MD_type(current_md))
+                        md = current_md;
+                }
+        if (!md)
+                {
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Message digest algorithm is "
+                                            "not supported.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
+                return 0;
+                }
+
+        /* No message digest takes parameter. */
+        if (md_alg->parameter 
+            && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL)
+                {
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Superfluous message digest "
+                                            "parameter.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
+                return 0;
+                }
+        /* Checking message digest size. */
+        digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
+        if (digest->length != EVP_MD_size(md))
+                {
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Bad message digest.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
+                return 0;
+                }
+
+        return 1;
+        }
+
+/* Returns the TSA policy based on the requested and acceptable policies. */
+static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx)
+        {
+        ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
+        ASN1_OBJECT *policy = NULL;
+        int i;
+
+        if (ctx->default_policy == NULL)
+                {
+                TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
+                return NULL;
+                }
+        /* Return the default policy if none is requested or the default is
+           requested. */
+        if (!requested || !OBJ_cmp(requested, ctx->default_policy))
+                policy = ctx->default_policy;
+
+        /* Check if the policy is acceptable. */
+        for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i)
+                {
+                ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
+                if (!OBJ_cmp(requested, current))
+                        policy = current;
+                }
+        if (!policy)
+                {
+                TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
+                TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
+                                            "Requested policy is not "
+                                            "supported.");
+                TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
+                }
+        return policy;
+        }
+
+/* Creates the TS_TST_INFO object based on the settings of the context. */
+static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
+                                            ASN1_OBJECT *policy)
+        {
+        int result = 0;
+        TS_TST_INFO *tst_info = NULL;
+        ASN1_INTEGER *serial = NULL;
+        ASN1_GENERALIZEDTIME *asn1_time = NULL;
+        long sec, usec;
+        TS_ACCURACY *accuracy = NULL;
+        const ASN1_INTEGER *nonce;
+        GENERAL_NAME *tsa_name = NULL;
+
+        if (!(tst_info = TS_TST_INFO_new())) goto end;
+        if (!TS_TST_INFO_set_version(tst_info, 1)) goto end;
+        if (!TS_TST_INFO_set_policy_id(tst_info, policy)) goto end;
+        if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
+                goto end;
+        if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data))
+            || !TS_TST_INFO_set_serial(tst_info, serial))
+                goto end;
+        if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec)
+            || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, 
+                                        sec, usec, 
+                                        ctx->clock_precision_digits))
+            || !TS_TST_INFO_set_time(tst_info, asn1_time))
+                goto end;
+
+        /* Setting accuracy if needed. */
+        if ((ctx->seconds || ctx->millis || ctx->micros) 
+            && !(accuracy = TS_ACCURACY_new()))
+                goto end;
+
+        if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
+                goto end;
+        if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
+                goto end;
+        if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
+                goto end;
+        if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 
+                goto end;
+
+        /* Setting ordering. */
+        if ((ctx->flags & TS_ORDERING) 
+            && !TS_TST_INFO_set_ordering(tst_info, 1))
+                goto end;
+        
+        /* Setting nonce if needed. */
+        if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL
+            && !TS_TST_INFO_set_nonce(tst_info, nonce))
+                goto end;
+
+        /* Setting TSA name to subject of signer certificate. */
+        if (ctx->flags & TS_TSA_NAME)
+                {
+                if (!(tsa_name = GENERAL_NAME_new())) goto end;
+                tsa_name->type = GEN_DIRNAME;
+                tsa_name->d.dirn = 
+                        X509_NAME_dup(ctx->signer_cert->cert_info->subject);
+                if (!tsa_name->d.dirn) goto end;
+                if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) goto end;
+                }
+
+        result = 1;
+ end:
+        if (!result)
+                {
+                TS_TST_INFO_free(tst_info);
+                tst_info = NULL;
+                TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
+                TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
+                                                 "Error during TSTInfo "
+                                                 "generation.");
+                }
+        GENERAL_NAME_free(tsa_name);
+        TS_ACCURACY_free(accuracy);
+        ASN1_GENERALIZEDTIME_free(asn1_time);
+        ASN1_INTEGER_free(serial);
+        
+        return tst_info;
+        }
+
+/* Processing the extensions of the request. */
+static int TS_RESP_process_extensions(TS_RESP_CTX *ctx)
+        {
+        STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
+        int i;
+        int ok = 1;
+
+        for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i)
+                {
+                X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
+                /* XXXXX The last argument was previously
+                   (void *)ctx->extension_cb, but ISO C doesn't permit
+                   converting a function pointer to void *.  For lack of
+                   better information, I'm placing a NULL there instead.
+                   The callback can pick its own address out from the ctx
+                   anyway...
+                */
+                ok = (*ctx->extension_cb)(ctx, ext, NULL);
+                }
+
+        return ok;
+        }
+
+/* Functions for signing the TS_TST_INFO structure of the context. */
+static int TS_RESP_sign(TS_RESP_CTX *ctx)
+        {
+        int ret = 0;
+        PKCS7 *p7 = NULL;
+        PKCS7_SIGNER_INFO *si;
+        STACK_OF(X509) *certs;  /* Certificates to include in sc. */
+        ESS_SIGNING_CERT *sc = NULL;
+        ASN1_OBJECT *oid;
+        BIO *p7bio = NULL;
+        int i;
+
+        /* Check if signcert and pkey match. */
+        if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
+                TSerr(TS_F_TS_RESP_SIGN, 
+                      TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
+                goto err;
+        }
+
+        /* Create a new PKCS7 signed object. */
+        if (!(p7 = PKCS7_new())) {
+                TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
+                goto err;
+        }
+        if (!PKCS7_set_type(p7, NID_pkcs7_signed)) goto err;
+
+        /* Force SignedData version to be 3 instead of the default 1. */
+        if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) goto err;
+
+        /* Add signer certificate and optional certificate chain. */
+        if (TS_REQ_get_cert_req(ctx->request))
+                {
+                PKCS7_add_certificate(p7, ctx->signer_cert);
+                if (ctx->certs)
+                        {
+                        for(i = 0; i < sk_X509_num(ctx->certs); ++i) 
+                                {
+                                X509 *cert = sk_X509_value(ctx->certs, i);
+                                PKCS7_add_certificate(p7, cert);
+                                }
+                        }
+                }
+
+        /* Add a new signer info. */
+        if (!(si = PKCS7_add_signature(p7, ctx->signer_cert, 
+                                       ctx->signer_key, EVP_sha1())))
+                {
+                TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
+                goto err;
+                }
+
+        /* Add content type signed attribute to the signer info. */
+        oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
+        if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
+                                        V_ASN1_OBJECT, oid))
+                {
+                TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
+                goto err;
+                }
+
+        /* Create the ESS SigningCertificate attribute which contains 
+           the signer certificate id and optionally the certificate chain. */
+        certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
+        if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
+                goto err;
+
+        /* Add SigningCertificate signed attribute to the signer info. */
+        if (!ESS_add_signing_cert(si, sc))
+                {
+                TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
+                goto err;
+                }       
+
+        /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
+        if (!TS_TST_INFO_content_new(p7)) goto err;
+
+        /* Add the DER encoded tst_info to the PKCS7 structure. */
+        if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
+                TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
+                goto err;
+        }
+
+        /* Convert tst_info to DER. */
+        if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info))
+                {
+                TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
+                goto err;
+                }
+
+        /* Create the signature and add it to the signer info. */
+        if (!PKCS7_dataFinal(p7, p7bio))
+                {
+                TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
+                goto err;
+                }
+
+        /* Set new PKCS7 and TST_INFO objects. */
+        TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
+        p7 = NULL;              /* Ownership is lost. */
+        ctx->tst_info = NULL;   /* Ownership is lost. */
+
+        ret = 1;
+ err:
+        if (!ret)
+                TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
+                                                 "Error during signature "
+                                                 "generation.");
+        BIO_free_all(p7bio);
+        ESS_SIGNING_CERT_free(sc);
+        PKCS7_free(p7);
+        return ret;
+        }
+
+static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 
+                                                   STACK_OF(X509) *certs)
+        {
+        ESS_CERT_ID *cid;
+        ESS_SIGNING_CERT *sc = NULL;
+        int i;
+
+        /* Creating the ESS_CERT_ID stack. */
+        if (!(sc = ESS_SIGNING_CERT_new())) goto err;
+        if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
+                goto err;
+
+        /* Adding the signing certificate id. */
+        if (!(cid = ESS_CERT_ID_new_init(signcert, 0))
+            || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
+                goto err;
+        /* Adding the certificate chain ids. */
+        for (i = 0; i < sk_X509_num(certs); ++i)
+                {
+                X509 *cert = sk_X509_value(certs, i);
+                if (!(cid = ESS_CERT_ID_new_init(cert, 1))
+                    || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
+                        goto err;
+                }
+
+        return sc;
+err:
+        ESS_SIGNING_CERT_free(sc);
+        TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
+        return NULL;
+        }
+
+static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
+        {
+        ESS_CERT_ID *cid = NULL;
+        GENERAL_NAME *name = NULL;
+        
+        /* Recompute SHA1 hash of certificate if necessary (side effect). */
+        X509_check_purpose(cert, -1, 0);
+
+        if (!(cid = ESS_CERT_ID_new())) goto err;
+        if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash,
+                                   sizeof(cert->sha1_hash)))
+                goto err;
+
+        /* Setting the issuer/serial if requested. */
+        if (issuer_needed)
+                {
+                /* Creating issuer/serial structure. */
+                if (!cid->issuer_serial
+                    && !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
+                        goto err;
+                /* Creating general name from the certificate issuer. */
+                if (!(name = GENERAL_NAME_new())) goto err;
+                name->type = GEN_DIRNAME;
+                if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer))) 
+                        goto err;
+                if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 
+                        goto err;
+                name = NULL;    /* Ownership is lost. */
+                /* Setting the serial number. */
+                ASN1_INTEGER_free(cid->issuer_serial->serial);
+                if (!(cid->issuer_serial->serial = 
+                      ASN1_INTEGER_dup(cert->cert_info->serialNumber)))
+                        goto err;
+                }
+
+        return cid;
+err:
+        GENERAL_NAME_free(name);
+        ESS_CERT_ID_free(cid);
+        TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
+        return NULL;
+        }
+
+static int TS_TST_INFO_content_new(PKCS7 *p7)
+        {
+        PKCS7 *ret = NULL;
+        ASN1_OCTET_STRING *octet_string = NULL;
+
+        /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
+        if (!(ret = PKCS7_new())) goto err;
+        if (!(ret->d.other = ASN1_TYPE_new())) goto err;
+        ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
+        if (!(octet_string = ASN1_OCTET_STRING_new())) goto err;
+        ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
+        octet_string = NULL;
+
+        /* Add encapsulated content to signed PKCS7 structure. */
+        if (!PKCS7_set_content(p7, ret)) goto err;
+
+        return 1;
+ err:
+        ASN1_OCTET_STRING_free(octet_string);
+        PKCS7_free(ret);
+        return 0;
+        }
+
+static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
+        {
+        ASN1_STRING *seq = NULL;
+        unsigned char *p, *pp = NULL;
+        int len;
+
+        len = i2d_ESS_SIGNING_CERT(sc, NULL);
+        if (!(pp = (unsigned char *) OPENSSL_malloc(len)))
+                {
+                TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
+                goto err;
+                }
+        p = pp;
+        i2d_ESS_SIGNING_CERT(sc, &p);
+        if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
+                {
+                TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
+                goto err;
+                }
+        OPENSSL_free(pp); pp = NULL;
+        return PKCS7_add_signed_attribute(si, 
+                                          NID_id_smime_aa_signingCertificate,
+                                          V_ASN1_SEQUENCE, seq);
+ err:
+        ASN1_STRING_free(seq);
+        OPENSSL_free(pp);
+
+        return 0;
+        }
+
+
+static ASN1_GENERALIZEDTIME *
+TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 
+                                   long sec, long usec, unsigned precision)
+        {
+        time_t time_sec = (time_t) sec;
+        struct tm *tm = NULL;   
+        char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
+        char *p = genTime_str;
+        char *p_end = genTime_str + sizeof(genTime_str);
+
+        if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
+                goto err;
+
+        
+        if (!(tm = gmtime(&time_sec)))
+                goto err;
+
+        /* 
+         * Put "genTime_str" in GeneralizedTime format.  We work around the 
+         * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 
+         * NOT include fractional seconds") and OpenSSL related functions to 
+         * meet the rfc3161 requirement: "GeneralizedTime syntax can include 
+         * fraction-of-second details". 
+         */                   
+        p += BIO_snprintf(p, p_end - p,
+                          "%04d%02d%02d%02d%02d%02d",
+                          tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 
+                          tm->tm_hour, tm->tm_min, tm->tm_sec);
+        if (precision > 0)
+        {
+                /* Add fraction of seconds (leave space for dot and null). */
+                BIO_snprintf(p, 2 + precision, ".%ld", usec);
+                /* We cannot use the snprintf return value, 
+                   because it might have been truncated. */
+                p += strlen(p);
+
+                /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides
+                   the following restrictions for a DER-encoding, which OpenSSL
+                   (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 
+                   support:
+                   "The encoding MUST terminate with a "Z" (which means "Zulu" 
+                   time). The decimal point element, if present, MUST be the 
+                   point option ".". The fractional-seconds elements, 
+                   if present, MUST omit all trailing 0's; 
+                   if the elements correspond to 0, they MUST be wholly
+                   omitted, and the decimal point element also MUST be
+                   omitted." */
+                /* Remove trailing zeros. The dot guarantees the exit
+                   condition of this loop even if all the digits are zero. */
+                while (*--p == '0')
+                        /* empty */;
+                /* p points to either the dot or the last non-zero digit. */
+                if (*p != '.') ++p;
+                }
+        /* Add the trailing Z and the terminating null. */
+        *p++ = 'Z';
+        *p++ = '\0';
+
+        /* Now call OpenSSL to check and set our genTime value */
+        if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new()))
+                goto err;
+        if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str))
+                {
+                ASN1_GENERALIZEDTIME_free(asn1_time);
+                goto err;
+                }
+
+        return asn1_time;
+ err:
+        TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
+        return NULL;
+        }