include/openssl/ct.h - third_party/openssl - Git at Google

 /*
  * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */

 #ifndef HEADER_CT_H
 # define HEADER_CT_H

 # include <openssl/opensslconf.h>

 # ifndef OPENSSL_NO_CT
 # include <openssl/ossl_typ.h>
 # include <openssl/safestack.h>
 # include <openssl/x509.h>
 # ifdef  __cplusplus
 extern "C" {
 # endif


 /* Minimum RSA key size, from RFC6962 */
 # define SCT_MIN_RSA_BITS 2048

 /* All hashes are SHA256 in v1 of Certificate Transparency */
 # define CT_V1_HASHLEN SHA256_DIGEST_LENGTH

 typedef enum {
     CT_LOG_ENTRY_TYPE_NOT_SET = -1,
     CT_LOG_ENTRY_TYPE_X509 = 0,
     CT_LOG_ENTRY_TYPE_PRECERT = 1
 } ct_log_entry_type_t;

 typedef enum {
     SCT_VERSION_NOT_SET = -1,
     SCT_VERSION_V1 = 0
 } sct_version_t;

 typedef enum {
     SCT_SOURCE_UNKNOWN,
     SCT_SOURCE_TLS_EXTENSION,
     SCT_SOURCE_X509V3_EXTENSION,
     SCT_SOURCE_OCSP_STAPLED_RESPONSE
 } sct_source_t;

 typedef enum {
     SCT_VALIDATION_STATUS_NOT_SET,
     SCT_VALIDATION_STATUS_UNKNOWN_LOG,
     SCT_VALIDATION_STATUS_VALID,
     SCT_VALIDATION_STATUS_INVALID,
     SCT_VALIDATION_STATUS_UNVERIFIED,
     SCT_VALIDATION_STATUS_UNKNOWN_VERSION
 } sct_validation_status_t;

 DEFINE_STACK_OF(SCT)
 DEFINE_STACK_OF(CTLOG)

 /******************************************
  * CT policy evaluation context functions *
  ******************************************/

 /* Creates a new, empty policy evaluation context */
 CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);

 /* Deletes a policy evaluation context */
 void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);

 /* Gets the peer certificate that the SCTs are for */
 X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);

 /* Sets the certificate associated with the received SCTs */
 void CT_POLICY_EVAL_CTX_set0_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);

 /* Gets the issuer of the aforementioned certificate */
 X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);

 /* Sets the issuer of the certificate associated with the received SCTs */
 void CT_POLICY_EVAL_CTX_set0_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);

 /* Gets the CT logs that are trusted sources of SCTs */
 const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);

 /* Sets the log store that is in use */
 void CT_POLICY_EVAL_CTX_set0_log_store(CT_POLICY_EVAL_CTX *ctx,
                                        CTLOG_STORE *log_store);

 /*****************
  * SCT functions *
  *****************/

 /*
  * Creates a new, blank SCT.
  * The caller is responsible for calling SCT_free when finished with the SCT.
  */
 SCT *SCT_new(void);

 /*
  * Creates a new SCT from some base64-encoded strings.
  * The caller is responsible for calling SCT_free when finished with the SCT.
  */
 SCT *SCT_new_from_base64(unsigned char version,
                          const char *logid_base64,
                          ct_log_entry_type_t entry_type,
                          uint64_t timestamp,
                          const char *extensions_base64,
                          const char *signature_base64);

 /*
  * Frees the SCT and the underlying data structures.
  */
 void SCT_free(SCT *sct);

 /*
  * Free a stack of SCTs, and the underlying SCTs themselves.
  * Intended to be compatible with X509V3_EXT_FREE.
  */
 void SCT_LIST_free(STACK_OF(SCT) *a);

 /*
  * Returns the version of the SCT.
  */
 sct_version_t SCT_get_version(const SCT *sct);

 /*
  * Set the version of an SCT.
  * Returns 1 on success, 0 if the version is unrecognized.
  */
 __owur int SCT_set_version(SCT *sct, sct_version_t version);

 /*
  * Returns the log entry type of the SCT.
  */
 ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);

 /*
  * Set the log entry type of an SCT.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);

 /*
  * Gets the ID of the log that an SCT came from.
  * Ownership of the log ID remains with the SCT.
  * Returns the length of the log ID.
  */
 size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);

 /*
  * Set the log ID of an SCT to point directly to the *log_id specified.
  * The SCT takes ownership of the specified pointer.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);

 /*
  * Set the log ID of an SCT.
  * This makes a copy of the log_id.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set1_log_id(SCT *sct, const unsigned char *log_id,
                            size_t log_id_len);

 /*
  * Returns the timestamp for the SCT (epoch time in milliseconds).
  */
 uint64_t SCT_get_timestamp(const SCT *sct);

 /*
  * Set the timestamp of an SCT (epoch time in milliseconds).
  */
 void SCT_set_timestamp(SCT *sct, uint64_t timestamp);

 /*
  * Return the NID for the signature used by the SCT.
  * For CT v1, this will be either NID_sha256WithRSAEncryption or
  * NID_ecdsa_with_SHA256 (or NID_undef if incorrect/unset).
  */
 int SCT_get_signature_nid(const SCT *sct);

 /*
  * Set the signature type of an SCT
  * For CT v1, this should be either NID_sha256WithRSAEncryption or
  * NID_ecdsa_with_SHA256.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set_signature_nid(SCT *sct, int nid);

 /*
  * Set *ext to point to the extension data for the SCT. ext must not be NULL.
  * The SCT retains ownership of this pointer.
  * Returns length of the data pointed to.
  */
 size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);

 /*
  * Set the extensions of an SCT to point directly to the *ext specified.
  * The SCT takes ownership of the specified pointer.
  */
 void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);

 /*
  * Set the extensions of an SCT.
  * This takes a copy of the ext.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set1_extensions(SCT *sct, const unsigned char *ext,
                                size_t ext_len);

 /*
  * Set *sig to point to the signature for the SCT. sig must not be NULL.
  * The SCT retains ownership of this pointer.
  * Returns length of the data pointed to.
  */
 size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);

 /*
  * Set the signature of an SCT to point directly to the *sig specified.
  * The SCT takes ownership of the specified pointer.
  */
 void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);

 /*
  * Set the signature of an SCT to be a copy of the *sig specified.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set1_signature(SCT *sct, const unsigned char *sig,
                               size_t sig_len);

 /*
  * The origin of this SCT, e.g. TLS extension, OCSP response, etc.
  */
 sct_source_t SCT_get_source(const SCT *sct);

 /*
  * Set the origin of this SCT, e.g. TLS extension, OCSP response, etc.
  * Returns 1 on success, 0 otherwise.
  */
 __owur int SCT_set_source(SCT *sct, sct_source_t source);

 /*
  * Returns a text string describing the validation status of |sct|.
  */
 const char *SCT_validation_status_string(const SCT *sct);

 /*
  * Pretty-prints an |sct| to |out|.
  * It will be indented by the number of spaces specified by |indent|.
  * If |logs| is not NULL, it will be used to lookup the CT log that the SCT came
  * from, so that the log name can be printed.
  */
 void SCT_print(const SCT *sct, BIO *out, int indent, const CTLOG_STORE *logs);

 /*
  * Pretty-prints an |sct_list| to |out|.
  * It will be indented by the number of spaces specified by |indent|.
  * SCTs will be delimited by |separator|.
  * If |logs| is not NULL, it will be used to lookup the CT log that each SCT
  * came from, so that the log names can be printed.
  */
 void SCT_LIST_print(const STACK_OF(SCT) *sct_list, BIO *out, int indent,
                     const char *separator, const CTLOG_STORE *logs);

 /*
  * Verifies an SCT with the given context.
  * Returns 1 if the SCT verifies successfully, 0 otherwise.
  */
 __owur int SCT_verify(const SCT_CTX *sctx, const SCT *sct);

 /*
  * Verifies an SCT against the provided data.
  * Returns 1 if the SCT verifies successfully, 0 otherwise.
  */
 __owur int SCT_verify_v1(SCT *sct, X509 *cert, X509 *preissuer,
                   X509_PUBKEY *log_pubkey, X509 *issuer_cert);

 /*
  * Gets the last result of validating this SCT.
  * If it has not been validated yet, returns SCT_VALIDATION_STATUS_NOT_SET.
  */
 sct_validation_status_t SCT_get_validation_status(const SCT *sct);

 /*
  * Validates the given SCT with the provided context.
  * Sets the "validation_status" field of the SCT.
  * Returns 1 if the SCT is valid and the signature verifies.
  * Returns 0 if the SCT is invalid or could not be verified.
  * Returns -1 if an error occurs.
  */
 __owur int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx);

 /*
  * Validates the given list of SCTs with the provided context.
  * Populates the "good_scts" and "bad_scts" of the evaluation context.
  * Returns 1 if there are no invalid SCTs and all signatures verify.
  * Returns 0 if at least one SCT is invalid or could not be verified.
  * Returns a negative integer if an error occurs.
  */
 __owur int SCT_LIST_validate(const STACK_OF(SCT) *scts,
                              CT_POLICY_EVAL_CTX *ctx);


 /*********************************
  * SCT parsing and serialisation *
  *********************************/

 /*
  * Serialize (to TLS format) a stack of SCTs and return the length.
  * "a" must not be NULL.
  * If "pp" is NULL, just return the length of what would have been serialized.
  * If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
  * for data that caller is responsible for freeing (only if function returns
  * successfully).
  * If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
  * that "*pp" is large enough to accept all of the serialized data.
  * Returns < 0 on error, >= 0 indicating bytes written (or would have been)
  * on success.
  */
 __owur int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);

 /*
  * Convert TLS format SCT list to a stack of SCTs.
  * If "a" or "*a" is NULL, a new stack will be created that the caller is
  * responsible for freeing (by calling SCT_LIST_free).
  * "**pp" and "*pp" must not be NULL.
  * Upon success, "*pp" will point to after the last bytes read, and a stack
  * will be returned.
  * Upon failure, a NULL pointer will be returned, and the position of "*pp" is
  * not defined.
  */
 STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
                             size_t len);

 /*
  * Serialize (to DER format) a stack of SCTs and return the length.
  * "a" must not be NULL.
  * If "pp" is NULL, just returns the length of what would have been serialized.
  * If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
  * for data that caller is responsible for freeing (only if function returns
  * successfully).
  * If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
  * that "*pp" is large enough to accept all of the serialized data.
  * Returns < 0 on error, >= 0 indicating bytes written (or would have been)
  * on success.
  */
 __owur int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);

 /*
  * Parses an SCT list in DER format and returns it.
  * If "a" or "*a" is NULL, a new stack will be created that the caller is
  * responsible for freeing (by calling SCT_LIST_free).
  * "**pp" and "*pp" must not be NULL.
  * Upon success, "*pp" will point to after the last bytes read, and a stack
  * will be returned.
  * Upon failure, a NULL pointer will be returned, and the position of "*pp" is
  * not defined.
  */
 STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
                             long len);

 /*
  * Serialize (to TLS format) an |sct| and write it to |out|.
  * If |out| is null, no SCT will be output but the length will still be returned.
  * If |out| points to a null pointer, a string will be allocated to hold the
  * TLS-format SCT. It is the responsibility of the caller to free it.
  * If |out| points to an allocated string, the TLS-format SCT will be written
  * to it.
  * The length of the SCT in TLS format will be returned.
  */
 __owur int i2o_SCT(const SCT *sct, unsigned char **out);

 /*
  * Parses an SCT in TLS format and returns it.
  * If |psct| is not null, it will end up pointing to the parsed SCT. If it
  * already points to a non-null pointer, the pointer will be free'd.
  * |in| should be a pointer to a string containing the TLS-format SCT.
  * |in| will be advanced to the end of the SCT if parsing succeeds.
  * |len| should be the length of the SCT in |in|.
  * Returns NULL if an error occurs.
  * If the SCT is an unsupported version, only the SCT's 'sct' and 'sct_len'
  * fields will be populated (with |in| and |len| respectively).
  */
 SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len);

 /*
 * Serialize (to TLS format) an |sct| signature and write it to |out|.
 * If |out| is null, no signature will be output but the length will be returned.
 * If |out| points to a null pointer, a string will be allocated to hold the
 * TLS-format signature. It is the responsibility of the caller to free it.
 * If |out| points to an allocated string, the signature will be written to it.
 * The length of the signature in TLS format will be returned.
 */
 __owur int i2o_SCT_signature(const SCT *sct, unsigned char **out);

 /*
 * Parses an SCT signature in TLS format and populates the |sct| with it.
 * |in| should be a pointer to a string containing the TLS-format signature.
 * |in| will be advanced to the end of the signature if parsing succeeds.
 * |len| should be the length of the signature in |in|.
 * Returns the number of bytes parsed, or a negative integer if an error occurs.
 */
 __owur int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len);

 /********************
  * CT log functions *
  ********************/

 /*
  * Creates a new CT log instance with the given |public_key| and |name|.
  * Should be deleted by the caller using CTLOG_free when no longer needed.
  */
 CTLOG *CTLOG_new(EVP_PKEY *public_key, const char *name);

 /*
  * Creates a new, blank CT log instance.
  * Should be deleted by the caller using CTLOG_free when no longer needed.
  */
 CTLOG *CTLOG_new_null(void);

 /*
  * Creates a new CT log instance with the given base64 public_key and |name|.
  * Should be deleted by the caller using CTLOG_free when no longer needed.
  */
 CTLOG *CTLOG_new_from_base64(const char *pkey_base64, const char *name);

 /*
  * Deletes a CT log instance and its fields.
  */
 void CTLOG_free(CTLOG *log);

 /* Gets the name of the CT log */
 const char *CTLOG_get0_name(const CTLOG *log);
 /* Gets the ID of the CT log */
 void CTLOG_get0_log_id(const CTLOG *log, const uint8_t **log_id,
                        size_t *log_id_len);
 /* Gets the public key of the CT log */
 EVP_PKEY *CTLOG_get0_public_key(const CTLOG *log);

 /**************************
  * CT log store functions *
  **************************/

 /*
  * Creates a new CT log store.
  * Should be deleted by the caller using CTLOG_STORE_free when no longer needed.
  */
 CTLOG_STORE *CTLOG_STORE_new(void);

 /*
  * Deletes a CT log store and all of the CT log instances held within.
  */
 void CTLOG_STORE_free(CTLOG_STORE *store);

 /*
  * Finds a CT log in the store based on its log ID.
  * Returns the CT log, or NULL if no match is found.
  */
 const CTLOG *CTLOG_STORE_get0_log_by_id(const CTLOG_STORE *store,
                                         const uint8_t *log_id,
                                         size_t log_id_len);

 /*
  * Loads a CT log list into a |store| from a |file|.
  * Returns 1 if loading is successful, or 0 otherwise.
  */
 __owur int CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file);

 /*
  * Loads the default CT log list into a |store|.
  * See internal/cryptlib.h for the environment variable and file path that are
  * consulted to find the default file.
  * Returns 1 if loading is successful, or 0 otherwise.
  */
 __owur int CTLOG_STORE_load_default_file(CTLOG_STORE *store);

 /* BEGIN ERROR CODES */
 /*
  * The following lines are auto generated by the script mkerr.pl. Any changes
  * made after this point may be overwritten when the script is next run.
  */

 void ERR_load_CT_strings(void);

 /* Error codes for the CT functions. */

 /* Function codes. */
 # define CT_F_CTLOG_NEW                                   117
 # define CT_F_CTLOG_NEW_FROM_BASE64                       118
 # define CT_F_CTLOG_NEW_FROM_CONF                         119
 # define CT_F_CTLOG_NEW_NULL                              120
 # define CT_F_CTLOG_STORE_LOAD_CTX_NEW                    122
 # define CT_F_CTLOG_STORE_LOAD_FILE                       123
 # define CT_F_CT_BASE64_DECODE                            124
 # define CT_F_CT_POLICY_EVAL_CTX_NEW                      133
 # define CT_F_CT_V1_LOG_ID_FROM_PKEY                      125
 # define CT_F_I2O_SCT                                     107
 # define CT_F_I2O_SCT_LIST                                108
 # define CT_F_I2O_SCT_SIGNATURE                           109
 # define CT_F_O2I_SCT                                     110
 # define CT_F_O2I_SCT_LIST                                111
 # define CT_F_O2I_SCT_SIGNATURE                           112
 # define CT_F_SCT_CTX_NEW                                 126
 # define CT_F_SCT_NEW                                     100
 # define CT_F_SCT_NEW_FROM_BASE64                         127
 # define CT_F_SCT_SET0_LOG_ID                             101
 # define CT_F_SCT_SET1_EXTENSIONS                         114
 # define CT_F_SCT_SET1_LOG_ID                             115
 # define CT_F_SCT_SET1_SIGNATURE                          116
 # define CT_F_SCT_SET_LOG_ENTRY_TYPE                      102
 # define CT_F_SCT_SET_SIGNATURE_NID                       103
 # define CT_F_SCT_SET_VERSION                             104
 # define CT_F_SCT_VERIFY                                  128
 # define CT_F_SCT_VERIFY_V1                               129

 /* Reason codes. */
 # define CT_R_BASE64_DECODE_ERROR                         108
 # define CT_R_INVALID_LOG_ID_LENGTH                       100
 # define CT_R_LOG_CONF_INVALID                            109
 # define CT_R_LOG_CONF_INVALID_KEY                        110
 # define CT_R_LOG_CONF_MISSING_DESCRIPTION                111
 # define CT_R_LOG_CONF_MISSING_KEY                        112
 # define CT_R_LOG_KEY_INVALID                             113
 # define CT_R_SCT_INVALID                                 104
 # define CT_R_SCT_INVALID_SIGNATURE                       107
 # define CT_R_SCT_LIST_INVALID                            105
 # define CT_R_SCT_LOG_ID_MISMATCH                         114
 # define CT_R_SCT_NOT_SET                                 106
 # define CT_R_SCT_UNSUPPORTED_VERSION                     115
 # define CT_R_UNRECOGNIZED_SIGNATURE_NID                  101
 # define CT_R_UNSUPPORTED_ENTRY_TYPE                      102
 # define CT_R_UNSUPPORTED_VERSION                         103

 #  ifdef  __cplusplus
 }
 #  endif
 # endif
 #endif
	/*
	* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
	*
	* Licensed under the OpenSSL license (the "License"). You may not use
	* this file except in compliance with the License. You can obtain a copy
	* in the file LICENSE in the source distribution or at
	* https://www.openssl.org/source/license.html
	*/

	#ifndef HEADER_CT_H
	# define HEADER_CT_H

	# include <openssl/opensslconf.h>

	# ifndef OPENSSL_NO_CT
	# include <openssl/ossl_typ.h>
	# include <openssl/safestack.h>
	# include <openssl/x509.h>
	# ifdef __cplusplus
	extern "C" {
	# endif


	/* Minimum RSA key size, from RFC6962 */
	# define SCT_MIN_RSA_BITS 2048

	/* All hashes are SHA256 in v1 of Certificate Transparency */
	# define CT_V1_HASHLEN SHA256_DIGEST_LENGTH

	typedef enum {
	CT_LOG_ENTRY_TYPE_NOT_SET = -1,
	CT_LOG_ENTRY_TYPE_X509 = 0,
	CT_LOG_ENTRY_TYPE_PRECERT = 1
	} ct_log_entry_type_t;

	typedef enum {
	SCT_VERSION_NOT_SET = -1,
	SCT_VERSION_V1 = 0
	} sct_version_t;

	typedef enum {
	SCT_SOURCE_UNKNOWN,
	SCT_SOURCE_TLS_EXTENSION,
	SCT_SOURCE_X509V3_EXTENSION,
	SCT_SOURCE_OCSP_STAPLED_RESPONSE
	} sct_source_t;

	typedef enum {
	SCT_VALIDATION_STATUS_NOT_SET,
	SCT_VALIDATION_STATUS_UNKNOWN_LOG,
	SCT_VALIDATION_STATUS_VALID,
	SCT_VALIDATION_STATUS_INVALID,
	SCT_VALIDATION_STATUS_UNVERIFIED,
	SCT_VALIDATION_STATUS_UNKNOWN_VERSION
	} sct_validation_status_t;

	DEFINE_STACK_OF(SCT)
	DEFINE_STACK_OF(CTLOG)

	/******************************************
	* CT policy evaluation context functions *
	******************************************/

	/* Creates a new, empty policy evaluation context */
	CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);

	/* Deletes a policy evaluation context */
	void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);

	/* Gets the peer certificate that the SCTs are for */
	X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);

	/* Sets the certificate associated with the received SCTs */
	void CT_POLICY_EVAL_CTX_set0_cert(CT_POLICY_EVAL_CTX ctx, X509 cert);

	/* Gets the issuer of the aforementioned certificate */
	X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);

	/* Sets the issuer of the certificate associated with the received SCTs */
	void CT_POLICY_EVAL_CTX_set0_issuer(CT_POLICY_EVAL_CTX ctx, X509 issuer);

	/* Gets the CT logs that are trusted sources of SCTs */
	const CTLOG_STORE CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX ctx);

	/* Sets the log store that is in use */
	void CT_POLICY_EVAL_CTX_set0_log_store(CT_POLICY_EVAL_CTX *ctx,
	CTLOG_STORE *log_store);

	/*****************
	* SCT functions *
	*****************/

	/*
	* Creates a new, blank SCT.
	* The caller is responsible for calling SCT_free when finished with the SCT.
	*/
	SCT *SCT_new(void);

	/*
	* Creates a new SCT from some base64-encoded strings.
	* The caller is responsible for calling SCT_free when finished with the SCT.
	*/
	SCT *SCT_new_from_base64(unsigned char version,
	const char *logid_base64,
	ct_log_entry_type_t entry_type,
	uint64_t timestamp,
	const char *extensions_base64,
	const char *signature_base64);

	/*
	* Frees the SCT and the underlying data structures.
	*/
	void SCT_free(SCT *sct);

	/*
	* Free a stack of SCTs, and the underlying SCTs themselves.
	* Intended to be compatible with X509V3_EXT_FREE.
	*/
	void SCT_LIST_free(STACK_OF(SCT) *a);

	/*
	* Returns the version of the SCT.
	*/
	sct_version_t SCT_get_version(const SCT *sct);

	/*
	* Set the version of an SCT.
	* Returns 1 on success, 0 if the version is unrecognized.
	*/
	__owur int SCT_set_version(SCT *sct, sct_version_t version);

	/*
	* Returns the log entry type of the SCT.
	*/
	ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);

	/*
	* Set the log entry type of an SCT.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);

	/*
	* Gets the ID of the log that an SCT came from.
	* Ownership of the log ID remains with the SCT.
	* Returns the length of the log ID.
	*/
	size_t SCT_get0_log_id(const SCT sct, unsigned char *log_id);

	/*
	* Set the log ID of an SCT to point directly to the *log_id specified.
	* The SCT takes ownership of the specified pointer.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set0_log_id(SCT sct, unsigned char log_id, size_t log_id_len);

	/*
	* Set the log ID of an SCT.
	* This makes a copy of the log_id.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set1_log_id(SCT sct, const unsigned char log_id,
	size_t log_id_len);

	/*
	* Returns the timestamp for the SCT (epoch time in milliseconds).
	*/
	uint64_t SCT_get_timestamp(const SCT *sct);

	/*
	* Set the timestamp of an SCT (epoch time in milliseconds).
	*/
	void SCT_set_timestamp(SCT *sct, uint64_t timestamp);

	/*
	* Return the NID for the signature used by the SCT.
	* For CT v1, this will be either NID_sha256WithRSAEncryption or
	* NID_ecdsa_with_SHA256 (or NID_undef if incorrect/unset).
	*/
	int SCT_get_signature_nid(const SCT *sct);

	/*
	* Set the signature type of an SCT
	* For CT v1, this should be either NID_sha256WithRSAEncryption or
	* NID_ecdsa_with_SHA256.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set_signature_nid(SCT *sct, int nid);

	/*
	* Set *ext to point to the extension data for the SCT. ext must not be NULL.
	* The SCT retains ownership of this pointer.
	* Returns length of the data pointed to.
	*/
	size_t SCT_get0_extensions(const SCT sct, unsigned char *ext);

	/*
	* Set the extensions of an SCT to point directly to the *ext specified.
	* The SCT takes ownership of the specified pointer.
	*/
	void SCT_set0_extensions(SCT sct, unsigned char ext, size_t ext_len);

	/*
	* Set the extensions of an SCT.
	* This takes a copy of the ext.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set1_extensions(SCT sct, const unsigned char ext,
	size_t ext_len);

	/*
	* Set *sig to point to the signature for the SCT. sig must not be NULL.
	* The SCT retains ownership of this pointer.
	* Returns length of the data pointed to.
	*/
	size_t SCT_get0_signature(const SCT sct, unsigned char *sig);

	/*
	* Set the signature of an SCT to point directly to the *sig specified.
	* The SCT takes ownership of the specified pointer.
	*/
	void SCT_set0_signature(SCT sct, unsigned char sig, size_t sig_len);

	/*
	* Set the signature of an SCT to be a copy of the *sig specified.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set1_signature(SCT sct, const unsigned char sig,
	size_t sig_len);

	/*
	* The origin of this SCT, e.g. TLS extension, OCSP response, etc.
	*/
	sct_source_t SCT_get_source(const SCT *sct);

	/*
	* Set the origin of this SCT, e.g. TLS extension, OCSP response, etc.
	* Returns 1 on success, 0 otherwise.
	*/
	__owur int SCT_set_source(SCT *sct, sct_source_t source);

	/*
	* Returns a text string describing the validation status of \|sct\|.
	*/
	const char SCT_validation_status_string(const SCT sct);

	/*
	* Pretty-prints an \|sct\| to \|out\|.
	* It will be indented by the number of spaces specified by \|indent\|.
	* If \|logs\| is not NULL, it will be used to lookup the CT log that the SCT came
	* from, so that the log name can be printed.
	*/
	void SCT_print(const SCT sct, BIO out, int indent, const CTLOG_STORE *logs);

	/*
	* Pretty-prints an \|sct_list\| to \|out\|.
	* It will be indented by the number of spaces specified by \|indent\|.
	* SCTs will be delimited by \|separator\|.
	* If \|logs\| is not NULL, it will be used to lookup the CT log that each SCT
	* came from, so that the log names can be printed.
	*/
	void SCT_LIST_print(const STACK_OF(SCT) sct_list, BIO out, int indent,
	const char separator, const CTLOG_STORE logs);

	/*
	* Verifies an SCT with the given context.
	* Returns 1 if the SCT verifies successfully, 0 otherwise.
	*/
	__owur int SCT_verify(const SCT_CTX sctx, const SCT sct);

	/*
	* Verifies an SCT against the provided data.
	* Returns 1 if the SCT verifies successfully, 0 otherwise.
	*/
	__owur int SCT_verify_v1(SCT sct, X509 cert, X509 *preissuer,
	X509_PUBKEY log_pubkey, X509 issuer_cert);

	/*
	* Gets the last result of validating this SCT.
	* If it has not been validated yet, returns SCT_VALIDATION_STATUS_NOT_SET.
	*/
	sct_validation_status_t SCT_get_validation_status(const SCT *sct);

	/*
	* Validates the given SCT with the provided context.
	* Sets the "validation_status" field of the SCT.
	* Returns 1 if the SCT is valid and the signature verifies.
	* Returns 0 if the SCT is invalid or could not be verified.
	* Returns -1 if an error occurs.
	*/
	__owur int SCT_validate(SCT sct, const CT_POLICY_EVAL_CTX ctx);

	/*
	* Validates the given list of SCTs with the provided context.
	* Populates the "good_scts" and "bad_scts" of the evaluation context.
	* Returns 1 if there are no invalid SCTs and all signatures verify.
	* Returns 0 if at least one SCT is invalid or could not be verified.
	* Returns a negative integer if an error occurs.
	*/
	__owur int SCT_LIST_validate(const STACK_OF(SCT) *scts,
	CT_POLICY_EVAL_CTX *ctx);


	/*********************************
	* SCT parsing and serialisation *
	*********************************/

	/*
	* Serialize (to TLS format) a stack of SCTs and return the length.
	* "a" must not be NULL.
	* If "pp" is NULL, just return the length of what would have been serialized.
	* If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
	* for data that caller is responsible for freeing (only if function returns
	* successfully).
	* If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
	* that "*pp" is large enough to accept all of the serialized data.
	* Returns < 0 on error, >= 0 indicating bytes written (or would have been)
	* on success.
	*/
	__owur int i2o_SCT_LIST(const STACK_OF(SCT) a, unsigned char *pp);

	/*
	* Convert TLS format SCT list to a stack of SCTs.
	* If "a" or "*a" is NULL, a new stack will be created that the caller is
	* responsible for freeing (by calling SCT_LIST_free).
	* "*pp" and "pp" must not be NULL.
	* Upon success, "*pp" will point to after the last bytes read, and a stack
	* will be returned.
	* Upon failure, a NULL pointer will be returned, and the position of "*pp" is
	* not defined.
	*/
	STACK_OF(SCT) o2i_SCT_LIST(STACK_OF(SCT) a, const unsigned char *pp,
	size_t len);

	/*
	* Serialize (to DER format) a stack of SCTs and return the length.
	* "a" must not be NULL.
	* If "pp" is NULL, just returns the length of what would have been serialized.
	* If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
	* for data that caller is responsible for freeing (only if function returns
	* successfully).
	* If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
	* that "*pp" is large enough to accept all of the serialized data.
	* Returns < 0 on error, >= 0 indicating bytes written (or would have been)
	* on success.
	*/
	__owur int i2d_SCT_LIST(const STACK_OF(SCT) a, unsigned char *pp);

	/*
	* Parses an SCT list in DER format and returns it.
	* If "a" or "*a" is NULL, a new stack will be created that the caller is
	* responsible for freeing (by calling SCT_LIST_free).
	* "*pp" and "pp" must not be NULL.
	* Upon success, "*pp" will point to after the last bytes read, and a stack
	* will be returned.
	* Upon failure, a NULL pointer will be returned, and the position of "*pp" is
	* not defined.
	*/
	STACK_OF(SCT) d2i_SCT_LIST(STACK_OF(SCT) a, const unsigned char *pp,
	long len);

	/*
	* Serialize (to TLS format) an \|sct\| and write it to \|out\|.
	* If \|out\| is null, no SCT will be output but the length will still be returned.
	* If \|out\| points to a null pointer, a string will be allocated to hold the
	* TLS-format SCT. It is the responsibility of the caller to free it.
	* If \|out\| points to an allocated string, the TLS-format SCT will be written
	* to it.
	* The length of the SCT in TLS format will be returned.
	*/
	__owur int i2o_SCT(const SCT sct, unsigned char *out);

	/*
	* Parses an SCT in TLS format and returns it.
	* If \|psct\| is not null, it will end up pointing to the parsed SCT. If it
	* already points to a non-null pointer, the pointer will be free'd.
	* \|in\| should be a pointer to a string containing the TLS-format SCT.
	* \|in\| will be advanced to the end of the SCT if parsing succeeds.
	* \|len\| should be the length of the SCT in \|in\|.
	* Returns NULL if an error occurs.
	* If the SCT is an unsupported version, only the SCT's 'sct' and 'sct_len'
	* fields will be populated (with \|in\| and \|len\| respectively).
	*/
	SCT o2i_SCT(SCT psct, const unsigned char *in, size_t len);

	/*
	* Serialize (to TLS format) an \|sct\| signature and write it to \|out\|.
	* If \|out\| is null, no signature will be output but the length will be returned.
	* If \|out\| points to a null pointer, a string will be allocated to hold the
	* TLS-format signature. It is the responsibility of the caller to free it.
	* If \|out\| points to an allocated string, the signature will be written to it.
	* The length of the signature in TLS format will be returned.
	*/
	__owur int i2o_SCT_signature(const SCT sct, unsigned char *out);

	/*
	* Parses an SCT signature in TLS format and populates the \|sct\| with it.
	* \|in\| should be a pointer to a string containing the TLS-format signature.
	* \|in\| will be advanced to the end of the signature if parsing succeeds.
	* \|len\| should be the length of the signature in \|in\|.
	* Returns the number of bytes parsed, or a negative integer if an error occurs.
	*/
	__owur int o2i_SCT_signature(SCT sct, const unsigned char *in, size_t len);

	/********************
	* CT log functions *
	********************/

	/*
	* Creates a new CT log instance with the given \|public_key\| and \|name\|.
	* Should be deleted by the caller using CTLOG_free when no longer needed.
	*/
	CTLOG CTLOG_new(EVP_PKEY public_key, const char *name);

	/*
	* Creates a new, blank CT log instance.
	* Should be deleted by the caller using CTLOG_free when no longer needed.
	*/
	CTLOG *CTLOG_new_null(void);

	/*
	* Creates a new CT log instance with the given base64 public_key and \|name\|.
	* Should be deleted by the caller using CTLOG_free when no longer needed.
	*/
	CTLOG CTLOG_new_from_base64(const char pkey_base64, const char *name);

	/*
	* Deletes a CT log instance and its fields.
	*/
	void CTLOG_free(CTLOG *log);

	/* Gets the name of the CT log */
	const char CTLOG_get0_name(const CTLOG log);
	/* Gets the ID of the CT log */
	void CTLOG_get0_log_id(const CTLOG log, const uint8_t *log_id,
	size_t *log_id_len);
	/* Gets the public key of the CT log */
	EVP_PKEY CTLOG_get0_public_key(const CTLOG log);

	/**************************
	* CT log store functions *
	**************************/

	/*
	* Creates a new CT log store.
	* Should be deleted by the caller using CTLOG_STORE_free when no longer needed.
	*/
	CTLOG_STORE *CTLOG_STORE_new(void);

	/*
	* Deletes a CT log store and all of the CT log instances held within.
	*/
	void CTLOG_STORE_free(CTLOG_STORE *store);

	/*
	* Finds a CT log in the store based on its log ID.
	* Returns the CT log, or NULL if no match is found.
	*/
	const CTLOG CTLOG_STORE_get0_log_by_id(const CTLOG_STORE store,
	const uint8_t *log_id,
	size_t log_id_len);

	/*
	* Loads a CT log list into a \|store\| from a \|file\|.
	* Returns 1 if loading is successful, or 0 otherwise.
	*/
	__owur int CTLOG_STORE_load_file(CTLOG_STORE store, const char file);

	/*
	* Loads the default CT log list into a \|store\|.
	* See internal/cryptlib.h for the environment variable and file path that are
	* consulted to find the default file.
	* Returns 1 if loading is successful, or 0 otherwise.
	*/
	__owur int CTLOG_STORE_load_default_file(CTLOG_STORE *store);

	/* BEGIN ERROR CODES */
	/*
	* The following lines are auto generated by the script mkerr.pl. Any changes
	* made after this point may be overwritten when the script is next run.
	*/

	void ERR_load_CT_strings(void);

	/* Error codes for the CT functions. */

	/* Function codes. */
	# define CT_F_CTLOG_NEW 117
	# define CT_F_CTLOG_NEW_FROM_BASE64 118
	# define CT_F_CTLOG_NEW_FROM_CONF 119
	# define CT_F_CTLOG_NEW_NULL 120
	# define CT_F_CTLOG_STORE_LOAD_CTX_NEW 122
	# define CT_F_CTLOG_STORE_LOAD_FILE 123
	# define CT_F_CT_BASE64_DECODE 124
	# define CT_F_CT_POLICY_EVAL_CTX_NEW 133
	# define CT_F_CT_V1_LOG_ID_FROM_PKEY 125
	# define CT_F_I2O_SCT 107
	# define CT_F_I2O_SCT_LIST 108
	# define CT_F_I2O_SCT_SIGNATURE 109
	# define CT_F_O2I_SCT 110
	# define CT_F_O2I_SCT_LIST 111
	# define CT_F_O2I_SCT_SIGNATURE 112
	# define CT_F_SCT_CTX_NEW 126
	# define CT_F_SCT_NEW 100
	# define CT_F_SCT_NEW_FROM_BASE64 127
	# define CT_F_SCT_SET0_LOG_ID 101
	# define CT_F_SCT_SET1_EXTENSIONS 114
	# define CT_F_SCT_SET1_LOG_ID 115
	# define CT_F_SCT_SET1_SIGNATURE 116
	# define CT_F_SCT_SET_LOG_ENTRY_TYPE 102
	# define CT_F_SCT_SET_SIGNATURE_NID 103
	# define CT_F_SCT_SET_VERSION 104
	# define CT_F_SCT_VERIFY 128
	# define CT_F_SCT_VERIFY_V1 129

	/* Reason codes. */
	# define CT_R_BASE64_DECODE_ERROR 108
	# define CT_R_INVALID_LOG_ID_LENGTH 100
	# define CT_R_LOG_CONF_INVALID 109
	# define CT_R_LOG_CONF_INVALID_KEY 110
	# define CT_R_LOG_CONF_MISSING_DESCRIPTION 111
	# define CT_R_LOG_CONF_MISSING_KEY 112
	# define CT_R_LOG_KEY_INVALID 113
	# define CT_R_SCT_INVALID 104
	# define CT_R_SCT_INVALID_SIGNATURE 107
	# define CT_R_SCT_LIST_INVALID 105
	# define CT_R_SCT_LOG_ID_MISMATCH 114
	# define CT_R_SCT_NOT_SET 106
	# define CT_R_SCT_UNSUPPORTED_VERSION 115
	# define CT_R_UNRECOGNIZED_SIGNATURE_NID 101
	# define CT_R_UNSUPPORTED_ENTRY_TYPE 102
	# define CT_R_UNSUPPORTED_VERSION 103

	# ifdef __cplusplus
	}
	# endif
	# endif
	#endif