_ocsp_req_export ---------------------- -- Function: int gnutls_ocsp_req_export (gnutls_ocsp_req_const_t REQ, gnutls_datum_t * DATA) REQ: Holds the OCSP request DATA: newly allocate buffer holding DER encoded OCSP request This function will export the OCSP request to DER format. *Returns:* In case of failure a negative error code will be returned, and 0 on success. gnutls_ocsp_req_get_cert_id --------------------------- -- Function: int gnutls_ocsp_req_get_cert_id (gnutls_ocsp_req_const_t REQ, unsigned INDX, gnutls_digest_algorithm_t * DIGEST, gnutls_datum_t * ISSUER_NAME_HASH, gnutls_datum_t * ISSUER_KEY_HASH, gnutls_datum_t * SERIAL_NUMBER) REQ: should contain a ‘gnutls_ocsp_req_t’ type INDX: Specifies which extension OID to get. Use (0) to get the first one. DIGEST: output variable with ‘gnutls_digest_algorithm_t’ hash algorithm ISSUER_NAME_HASH: output buffer with hash of issuer's DN ISSUER_KEY_HASH: output buffer with hash of issuer's public key SERIAL_NUMBER: output buffer with serial number of certificate to check This function will return the certificate information of the ‘indx’ 'ed request in the OCSP request. The information returned corresponds to the CertID structure: CertID ::= SEQUENCE { hashAlgorithm AlgorithmIdentifier, issuerNameHash OCTET STRING, - Hash of Issuer's DN issuerKeyHash OCTET STRING, - Hash of Issuers public key serialNumber CertificateSerialNumber } Each of the pointers to output variables may be NULL to indicate that the caller is not interested in that value. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. If you have reached the last CertID available ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ will be returned. gnutls_ocsp_req_get_extension ----------------------------- -- Function: int gnutls_ocsp_req_get_extension (gnutls_ocsp_req_const_t REQ, unsigned INDX, gnutls_datum_t * OID, unsigned int * CRITICAL, gnutls_datum_t * DATA) REQ: should contain a ‘gnutls_ocsp_req_t’ type INDX: Specifies which extension OID to get. Use (0) to get the first one. OID: will hold newly allocated buffer with OID of extension, may be NULL CRITICAL: output variable with critical flag, may be NULL. DATA: will hold newly allocated buffer with extension data, may be NULL This function will return all information about the requested extension in the OCSP request. The information returned is the OID, the critical flag, and the data itself. The extension OID will be stored as a string. Any of ‘oid’ , ‘critical’ , and ‘data’ may be NULL which means that the caller is not interested in getting that information back. The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘oid’ ->data and ‘data’ ->data. Since 3.7.0 ‘oid’ ->size does not account for the terminating null byte. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. If you have reached the last extension available ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ will be returned. gnutls_ocsp_req_get_nonce ------------------------- -- Function: int gnutls_ocsp_req_get_nonce (gnutls_ocsp_req_const_t REQ, unsigned int * CRITICAL, gnutls_datum_t * NONCE) REQ: should contain a ‘gnutls_ocsp_req_t’ type CRITICAL: whether nonce extension is marked critical, or NULL NONCE: will hold newly allocated buffer with nonce data This function will return the OCSP request nonce extension data. The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘nonce’ ->data. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. gnutls_ocsp_req_get_version --------------------------- -- Function: int gnutls_ocsp_req_get_version (gnutls_ocsp_req_const_t REQ) REQ: should contain a ‘gnutls_ocsp_req_t’ type This function will return the version of the OCSP request. Typically this is always 1 indicating version 1. *Returns:* version of OCSP request, or a negative error code on error. gnutls_ocsp_req_import ---------------------- -- Function: int gnutls_ocsp_req_import (gnutls_ocsp_req_t REQ, const gnutls_datum_t * DATA) REQ: The data to store the parsed request. DATA: DER encoded OCSP request. This function will convert the given DER encoded OCSP request to the native ‘gnutls_ocsp_req_t’ format. The output will be stored in ‘req’ . *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_req_init -------------------- -- Function: int gnutls_ocsp_req_init (gnutls_ocsp_req_t * REQ) REQ: A pointer to the type to be initialized This function will initialize an OCSP request structure. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_req_print --------------------- -- Function: int gnutls_ocsp_req_print (gnutls_ocsp_req_const_t REQ, gnutls_ocsp_print_formats_t FORMAT, gnutls_datum_t * OUT) REQ: The data to be printed FORMAT: Indicate the format to use OUT: Newly allocated datum with (0) terminated string. This function will pretty print a OCSP request, suitable for display to a human. If the format is ‘GNUTLS_OCSP_PRINT_FULL’ then all fields of the request will be output, on multiple lines. The output ‘out’ ->data needs to be deallocate using ‘gnutls_free()’ . *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_req_randomize_nonce ------------------------------- -- Function: int gnutls_ocsp_req_randomize_nonce (gnutls_ocsp_req_t REQ) REQ: should contain a ‘gnutls_ocsp_req_t’ type This function will add or update an nonce extension to the OCSP request with a newly generated random value. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. gnutls_ocsp_req_set_extension ----------------------------- -- Function: int gnutls_ocsp_req_set_extension (gnutls_ocsp_req_t REQ, const char * OID, unsigned int CRITICAL, const gnutls_datum_t * DATA) REQ: should contain a ‘gnutls_ocsp_req_t’ type OID: buffer with OID of extension as a string. CRITICAL: critical flag, normally false. DATA: the extension data This function will add an extension to the OCSP request. Calling this function multiple times for the same OID will overwrite values from earlier calls. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. gnutls_ocsp_req_set_nonce ------------------------- -- Function: int gnutls_ocsp_req_set_nonce (gnutls_ocsp_req_t REQ, unsigned int CRITICAL, const gnutls_datum_t * NONCE) REQ: should contain a ‘gnutls_ocsp_req_t’ type CRITICAL: critical flag, normally false. NONCE: the nonce data This function will add an nonce extension to the OCSP request. Calling this function multiple times will overwrite values from earlier calls. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. gnutls_ocsp_resp_check_crt -------------------------- -- Function: int gnutls_ocsp_resp_check_crt (gnutls_ocsp_resp_const_t RESP, unsigned int INDX, gnutls_x509_crt_t CRT) RESP: should contain a ‘gnutls_ocsp_resp_t’ type INDX: Specifies response number to get. Use (0) to get the first one. CRT: The certificate to check This function will check whether the OCSP response is about the provided certificate. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. *Since:* 3.1.3 gnutls_ocsp_resp_deinit ----------------------- -- Function: void gnutls_ocsp_resp_deinit (gnutls_ocsp_resp_t RESP) RESP: The data to be deinitialized This function will deinitialize a OCSP response structure. gnutls_ocsp_resp_export ----------------------- -- Function: int gnutls_ocsp_resp_export (gnutls_ocsp_resp_const_t RESP, gnutls_datum_t * DATA) RESP: Holds the OCSP response DATA: newly allocate buffer holding DER encoded OCSP response This function will export the OCSP response to DER format. *Returns:* In case of failure a negative error code will be returned, and 0 on success. gnutls_ocsp_resp_export2 ------------------------ -- Function: int gnutls_ocsp_resp_export2 (gnutls_ocsp_resp_const_t RESP, gnutls_datum_t * DATA, gnutls_x509_crt_fmt_t FMT) RESP: Holds the OCSP response DATA: newly allocate buffer holding DER or PEM encoded OCSP response FMT: DER or PEM This function will export the OCSP response to DER or PEM format. *Returns:* In case of failure a negative error code will be returned, and 0 on success. *Since:* 3.6.3 gnutls_ocsp_resp_get_certs -------------------------- -- Function: int gnutls_ocsp_resp_get_certs (gnutls_ocsp_resp_const_t RESP, gnutls_x509_crt_t ** CERTS, size_t * NCERTS) RESP: should contain a ‘gnutls_ocsp_resp_t’ type CERTS: newly allocated array with ‘gnutls_x509_crt_t’ certificates NCERTS: output variable with number of allocated certs. This function will extract the X.509 certificates found in the Basic OCSP Response. The ‘certs’ output variable will hold a newly allocated zero-terminated array with X.509 certificates. Every certificate in the array needs to be de-allocated with ‘gnutls_x509_crt_deinit()’ and the array itself must be freed using ‘gnutls_free()’ . Both the ‘certs’ and ‘ncerts’ variables may be NULL. Then the function will work as normal but will not return the NULL:d information. This can be used to get the number of certificates only, or to just get the certificate array without its size. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_get_extension ------------------------------ -- Function: int gnutls_ocsp_resp_get_extension (gnutls_ocsp_resp_const_t RESP, unsigned INDX, gnutls_datum_t * OID, unsigned int * CRITICAL, gnutls_datum_t * DATA) RESP: should contain a ‘gnutls_ocsp_resp_t’ type INDX: Specifies which extension OID to get. Use (0) to get the first one. OID: will hold newly allocated buffer with OID of extension, may be NULL CRITICAL: output variable with critical flag, may be NULL. DATA: will hold newly allocated buffer with extension data, may be NULL This function will return all information about the requested extension in the OCSP response. The information returned is the OID, the critical flag, and the data itself. The extension OID will be stored as a string. Any of ‘oid’ , ‘critical’ , and ‘data’ may be NULL which means that the caller is not interested in getting that information back. The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘oid’ ->data and ‘data’ ->data. Since 3.7.0 ‘oid’ ->size does not account for the terminating null byte. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. If you have reached the last extension available ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ will be returned. gnutls_ocsp_resp_get_nonce -------------------------- -- Function: int gnutls_ocsp_resp_get_nonce (gnutls_ocsp_resp_const_t RESP, unsigned int * CRITICAL, gnutls_datum_t * NONCE) RESP: should contain a ‘gnutls_ocsp_resp_t’ type CRITICAL: whether nonce extension is marked critical NONCE: will hold newly allocated buffer with nonce data This function will return the Basic OCSP Response nonce extension data. The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘nonce’ ->data. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. gnutls_ocsp_resp_get_produced ----------------------------- -- Function: time_t gnutls_ocsp_resp_get_produced (gnutls_ocsp_resp_const_t RESP) RESP: should contain a ‘gnutls_ocsp_resp_t’ type This function will return the time when the OCSP response was signed. *Returns:* signing time, or (time_t)-1 on error. gnutls_ocsp_resp_get_responder ------------------------------ -- Function: int gnutls_ocsp_resp_get_responder (gnutls_ocsp_resp_const_t RESP, gnutls_datum_t * DN) RESP: should contain a ‘gnutls_ocsp_resp_t’ type DN: newly allocated buffer with name This function will extract the name of the Basic OCSP Response in the provided buffer. The name will be in the form "C=xxxx,O=yyyy,CN=zzzz" as described in RFC2253. The output string will be ASCII or UTF-8 encoded, depending on the certificate data. If the responder ID is not a name but a hash, this function will return zero and the ‘dn’ elements will be set to ‘NULL’ . The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘dn’ ->data. This function does not output a fully RFC4514 compliant string, if that is required see ‘gnutls_ocsp_resp_get_responder2()’ . *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. When no data exist it will return success and set ‘dn’ elements to zero. gnutls_ocsp_resp_get_responder2 ------------------------------- -- Function: int gnutls_ocsp_resp_get_responder2 (gnutls_ocsp_resp_const_t RESP, gnutls_datum_t * DN, unsigned FLAGS) RESP: should contain a ‘gnutls_ocsp_resp_t’ type DN: newly allocated buffer with name FLAGS: zero or ‘GNUTLS_X509_DN_FLAG_COMPAT’ This function will extract the name of the Basic OCSP Response in the provided buffer. The name will be in the form "C=xxxx,O=yyyy,CN=zzzz" as described in RFC2253. The output string will be ASCII or UTF-8 encoded, depending on the certificate data. If the responder ID is not a name but a hash, this function will return zero and the ‘dn’ elements will be set to ‘NULL’ . The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘dn’ ->data. When the flag ‘GNUTLS_X509_DN_FLAG_COMPAT’ is specified, the output format will match the format output by previous to 3.5.6 versions of GnuTLS which was not not fully RFC4514-compliant. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. When no data exist it will return ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ . gnutls_ocsp_resp_get_responder_raw_id ------------------------------------- -- Function: int gnutls_ocsp_resp_get_responder_raw_id (gnutls_ocsp_resp_const_t RESP, unsigned TYPE, gnutls_datum_t * RAW) RESP: should contain a ‘gnutls_ocsp_resp_t’ type TYPE: should be ‘GNUTLS_OCSP_RESP_ID_KEY’ or ‘GNUTLS_OCSP_RESP_ID_DN’ RAW: newly allocated buffer with the raw ID This function will extract the raw key (or DN) ID of the Basic OCSP Response in the provided buffer. If the responder ID is not a key ID then this function will return ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ . The caller needs to deallocate memory by calling ‘gnutls_free()’ on ‘dn’ ->data. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. gnutls_ocsp_resp_get_response ----------------------------- -- Function: int gnutls_ocsp_resp_get_response (gnutls_ocsp_resp_const_t RESP, gnutls_datum_t * RESPONSE_TYPE_OID, gnutls_datum_t * RESPONSE) RESP: should contain a ‘gnutls_ocsp_resp_t’ type RESPONSE_TYPE_OID: newly allocated output buffer with response type OID RESPONSE: newly allocated output buffer with DER encoded response This function will extract the response type OID in and the response data from an OCSP response. Normally the ‘response_type_oid’ is always "1.3.6.1.5.5.7.48.1.1" which means the ‘response’ should be decoded as a Basic OCSP Response, but technically other response types could be used. This function is typically only useful when you want to extract the response type OID of an response for diagnostic purposes. Otherwise ‘gnutls_ocsp_resp_import()’ will decode the basic OCSP response part and the caller need not worry about that aspect. Since 3.7.0 ‘response_type_oid’ ->size does not account for the terminating null byte. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_get_signature ------------------------------ -- Function: int gnutls_ocsp_resp_get_signature (gnutls_ocsp_resp_const_t RESP, gnutls_datum_t * SIG) RESP: should contain a ‘gnutls_ocsp_resp_t’ type SIG: newly allocated output buffer with signature data This function will extract the signature field of a OCSP response. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_get_signature_algorithm ---------------------------------------- -- Function: int gnutls_ocsp_resp_get_signature_algorithm (gnutls_ocsp_resp_const_t RESP) RESP: should contain a ‘gnutls_ocsp_resp_t’ type This function will return a value of the ‘gnutls_sign_algorithm_t’ enumeration that is the signature algorithm that has been used to sign the OCSP response. *Returns:* a ‘gnutls_sign_algorithm_t’ value, or a negative error code on error. gnutls_ocsp_resp_get_single --------------------------- -- Function: int gnutls_ocsp_resp_get_single (gnutls_ocsp_resp_const_t RESP, unsigned INDX, gnutls_digest_algorithm_t * DIGEST, gnutls_datum_t * ISSUER_NAME_HASH, gnutls_datum_t * ISSUER_KEY_HASH, gnutls_datum_t * SERIAL_NUMBER, unsigned int * CERT_STATUS, time_t * THIS_UPDATE, time_t * NEXT_UPDATE, time_t * REVOCATION_TIME, unsigned int * REVOCATION_REASON) RESP: should contain a ‘gnutls_ocsp_resp_t’ type INDX: Specifies response number to get. Use (0) to get the first one. DIGEST: output variable with ‘gnutls_digest_algorithm_t’ hash algorithm ISSUER_NAME_HASH: output buffer with hash of issuer's DN ISSUER_KEY_HASH: output buffer with hash of issuer's public key SERIAL_NUMBER: output buffer with serial number of certificate to check CERT_STATUS: a certificate status, a ‘gnutls_ocsp_cert_status_t’ enum. THIS_UPDATE: time at which the status is known to be correct. NEXT_UPDATE: when newer information will be available, or (time_t)-1 if unspecified REVOCATION_TIME: when ‘cert_status’ is ‘GNUTLS_OCSP_CERT_REVOKED’ , holds time of revocation. REVOCATION_REASON: revocation reason, a ‘gnutls_x509_crl_reason_t’ enum. This function will return the certificate information of the ‘indx’ 'ed response in the Basic OCSP Response ‘resp’ . The information returned corresponds to the OCSP SingleResponse structure except the final singleExtensions. Each of the pointers to output variables may be NULL to indicate that the caller is not interested in that value. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error code is returned. If you have reached the last CertID available ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ will be returned. gnutls_ocsp_resp_get_status --------------------------- -- Function: int gnutls_ocsp_resp_get_status (gnutls_ocsp_resp_const_t RESP) RESP: should contain a ‘gnutls_ocsp_resp_t’ type This function will return the status of a OCSP response, an ‘gnutls_ocsp_resp_status_t’ enumeration. *Returns:* status of OCSP request as a ‘gnutls_ocsp_resp_status_t’ , or a negative error code on error. gnutls_ocsp_resp_get_version ---------------------------- -- Function: int gnutls_ocsp_resp_get_version (gnutls_ocsp_resp_const_t RESP) RESP: should contain a ‘gnutls_ocsp_resp_t’ type This function will return the version of the Basic OCSP Response. Typically this is always 1 indicating version 1. *Returns:* version of Basic OCSP response, or a negative error code on error. gnutls_ocsp_resp_import ----------------------- -- Function: int gnutls_ocsp_resp_import (gnutls_ocsp_resp_t RESP, const gnutls_datum_t * DATA) RESP: The data to store the parsed response. DATA: DER encoded OCSP response. This function will convert the given DER encoded OCSP response to the native ‘gnutls_ocsp_resp_t’ format. It also decodes the Basic OCSP Response part, if any. The output will be stored in ‘resp’ . *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_import2 ------------------------ -- Function: int gnutls_ocsp_resp_import2 (gnutls_ocsp_resp_t RESP, const gnutls_datum_t * DATA, gnutls_x509_crt_fmt_t FMT) RESP: The data to store the parsed response. DATA: DER or PEM encoded OCSP response. FMT: DER or PEM This function will convert the given OCSP response to the native ‘gnutls_ocsp_resp_t’ format. It also decodes the Basic OCSP Response part, if any. The output will be stored in ‘resp’ . *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. *Since:* 3.6.3 gnutls_ocsp_resp_init --------------------- -- Function: int gnutls_ocsp_resp_init (gnutls_ocsp_resp_t * RESP) RESP: A pointer to the type to be initialized This function will initialize an OCSP response structure. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_list_import2 ----------------------------- -- Function: int gnutls_ocsp_resp_list_import2 (gnutls_ocsp_resp_t ** OCSPS, unsigned int * SIZE, const gnutls_datum_t * RESP_DATA, gnutls_x509_crt_fmt_t FORMAT, unsigned int FLAGS) OCSPS: Will hold the parsed OCSP response list. SIZE: It will contain the size of the list. RESP_DATA: The PEM encoded OCSP list. FORMAT: One of ‘GNUTLS_X509_FMT_PEM’ or ‘GNUTLS_X509_FMT_DER’ FLAGS: must be (0) or an OR'd sequence of gnutls_certificate_import_flags. This function will convert the given PEM encoded OCSP response list to the native gnutls_ocsp_resp_t format. The output will be stored in ‘ocsps’ which will be allocated and initialized. The OCSP responses should have a header of "OCSP RESPONSE". To deinitialize responses, you need to deinitialize each ‘gnutls_ocsp_resp_t’ structure independently, and use ‘gnutls_free()’ at ‘ocsps’ . In PEM files, when no OCSP responses are detected ‘GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE’ will be returned. *Returns:* the number of responses read or a negative error value. *Since:* 3.6.3 gnutls_ocsp_resp_print ---------------------- -- Function: int gnutls_ocsp_resp_print (gnutls_ocsp_resp_const_t RESP, gnutls_ocsp_print_formats_t FORMAT, gnutls_datum_t * OUT) RESP: The data to be printed FORMAT: Indicate the format to use OUT: Newly allocated datum with (0) terminated string. This function will pretty print a OCSP response, suitable for display to a human. If the format is ‘GNUTLS_OCSP_PRINT_FULL’ then all fields of the response will be output, on multiple lines. The output ‘out’ ->data needs to be deallocate using ‘gnutls_free()’ . *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_verify ----------------------- -- Function: int gnutls_ocsp_resp_verify (gnutls_ocsp_resp_const_t RESP, gnutls_x509_trust_list_t TRUSTLIST, unsigned int * VERIFY, unsigned int FLAGS) RESP: should contain a ‘gnutls_ocsp_resp_t’ type TRUSTLIST: trust anchors as a ‘gnutls_x509_trust_list_t’ type VERIFY: output variable with verification status, an ‘gnutls_ocsp_verify_reason_t’ FLAGS: verification flags from ‘gnutls_certificate_verify_flags’ Verify signature of the Basic OCSP Response against the public key in the certificate of a trusted signer. The ‘trustlist’ should be populated with trust anchors. The function will extract the signer certificate from the Basic OCSP Response and will verify it against the ‘trustlist’ . A trusted signer is a certificate that is either in ‘trustlist’ , or it is signed directly by a certificate in ‘trustlist’ and has the id-ad-ocspSigning Extended Key Usage bit set. The output ‘verify’ variable will hold verification status codes (e.g., ‘GNUTLS_OCSP_VERIFY_SIGNER_NOT_FOUND’ , ‘GNUTLS_OCSP_VERIFY_INSECURE_ALGORITHM’ ) which are only valid if the function returned ‘GNUTLS_E_SUCCESS’ . Note that the function returns ‘GNUTLS_E_SUCCESS’ even when verification failed. The caller must always inspect the ‘verify’ variable to find out the verification status. The ‘flags’ variable should be 0 for now. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value. gnutls_ocsp_resp_verify_direct ------------------------------ -- Function: int gnutls_ocsp_resp_verify_direct (gnutls_ocsp_resp_const_t RESP, gnutls_x509_crt_t ISSUER, unsigned int * VERIFY, unsigned int FLAGS) RESP: should contain a ‘gnutls_ocsp_resp_t’ type ISSUER: certificate believed to have signed the response VERIFY: output variable with verification status, an ‘gnutls_ocsp_verify_reason_t’ FLAGS: verification flags from ‘gnutls_certificate_verify_flags’ Verify signature of the Basic OCSP Response against the public key in the ‘issuer’ certificate. The output ‘verify’ variable will hold verification status codes (e.g., ‘GNUTLS_OCSP_VERIFY_SIGNER_NOT_FOUND’ , ‘GNUTLS_OCSP_VERIFY_INSECURE_ALGORITHM’ ) which are only valid if the function returned ‘GNUTLS_E_SUCCESS’ . Note that the function returns ‘GNUTLS_E_SUCCESS’ even when verification failed. The caller must always inspect the ‘verify’ variable to find out the verification status. The ‘flags’ variable should be 0 for now. *Returns:* On success, ‘GNUTLS_E_SUCCESS’ (0) is returned, otherwise a negative error value.