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475 lines
16 KiB
C
475 lines
16 KiB
C
/*
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* Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef HEADER_CT_H
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# define HEADER_CT_H
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# include <openssl/opensslconf.h>
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# ifndef OPENSSL_NO_CT
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# include <openssl/ossl_typ.h>
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# include <openssl/safestack.h>
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# include <openssl/x509.h>
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# include <openssl/cterr.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* Minimum RSA key size, from RFC6962 */
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# define SCT_MIN_RSA_BITS 2048
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/* All hashes are SHA256 in v1 of Certificate Transparency */
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# define CT_V1_HASHLEN SHA256_DIGEST_LENGTH
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typedef enum {
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CT_LOG_ENTRY_TYPE_NOT_SET = -1,
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CT_LOG_ENTRY_TYPE_X509 = 0,
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CT_LOG_ENTRY_TYPE_PRECERT = 1
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} ct_log_entry_type_t;
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typedef enum {
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SCT_VERSION_NOT_SET = -1,
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SCT_VERSION_V1 = 0
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} sct_version_t;
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typedef enum {
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SCT_SOURCE_UNKNOWN,
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SCT_SOURCE_TLS_EXTENSION,
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SCT_SOURCE_X509V3_EXTENSION,
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SCT_SOURCE_OCSP_STAPLED_RESPONSE
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} sct_source_t;
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typedef enum {
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SCT_VALIDATION_STATUS_NOT_SET,
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SCT_VALIDATION_STATUS_UNKNOWN_LOG,
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SCT_VALIDATION_STATUS_VALID,
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SCT_VALIDATION_STATUS_INVALID,
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SCT_VALIDATION_STATUS_UNVERIFIED,
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SCT_VALIDATION_STATUS_UNKNOWN_VERSION
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} sct_validation_status_t;
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DEFINE_STACK_OF(SCT)
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DEFINE_STACK_OF(CTLOG)
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/******************************************
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* CT policy evaluation context functions *
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******************************************/
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/*
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* Creates a new, empty policy evaluation context.
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* The caller is responsible for calling CT_POLICY_EVAL_CTX_free when finished
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* with the CT_POLICY_EVAL_CTX.
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*/
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CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);
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/* Deletes a policy evaluation context and anything it owns. */
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void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);
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/* Gets the peer certificate that the SCTs are for */
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X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);
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/*
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* Sets the certificate associated with the received SCTs.
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* Increments the reference count of cert.
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* Returns 1 on success, 0 otherwise.
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*/
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int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);
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/* Gets the issuer of the aforementioned certificate */
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X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);
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/*
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* Sets the issuer of the certificate associated with the received SCTs.
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* Increments the reference count of issuer.
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* Returns 1 on success, 0 otherwise.
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*/
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int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);
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/* Gets the CT logs that are trusted sources of SCTs */
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const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);
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/* Sets the log store that is in use. It must outlive the CT_POLICY_EVAL_CTX. */
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void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
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CTLOG_STORE *log_store);
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/*
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* Gets the time, in milliseconds since the Unix epoch, that will be used as the
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* current time when checking whether an SCT was issued in the future.
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* Such SCTs will fail validation, as required by RFC6962.
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*/
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uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx);
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/*
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* Sets the time to evaluate SCTs against, in milliseconds since the Unix epoch.
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* If an SCT's timestamp is after this time, it will be interpreted as having
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* been issued in the future. RFC6962 states that "TLS clients MUST reject SCTs
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* whose timestamp is in the future", so an SCT will not validate in this case.
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*/
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void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms);
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/*****************
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* SCT functions *
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*****************/
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/*
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* Creates a new, blank SCT.
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* The caller is responsible for calling SCT_free when finished with the SCT.
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*/
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SCT *SCT_new(void);
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/*
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* Creates a new SCT from some base64-encoded strings.
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* The caller is responsible for calling SCT_free when finished with the SCT.
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*/
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SCT *SCT_new_from_base64(unsigned char version,
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const char *logid_base64,
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ct_log_entry_type_t entry_type,
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uint64_t timestamp,
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const char *extensions_base64,
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const char *signature_base64);
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/*
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* Frees the SCT and the underlying data structures.
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*/
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void SCT_free(SCT *sct);
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/*
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* Free a stack of SCTs, and the underlying SCTs themselves.
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* Intended to be compatible with X509V3_EXT_FREE.
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*/
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void SCT_LIST_free(STACK_OF(SCT) *a);
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/*
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* Returns the version of the SCT.
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*/
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sct_version_t SCT_get_version(const SCT *sct);
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/*
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* Set the version of an SCT.
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* Returns 1 on success, 0 if the version is unrecognized.
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*/
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__owur int SCT_set_version(SCT *sct, sct_version_t version);
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/*
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* Returns the log entry type of the SCT.
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*/
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ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);
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/*
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* Set the log entry type of an SCT.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
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/*
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* Gets the ID of the log that an SCT came from.
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* Ownership of the log ID remains with the SCT.
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* Returns the length of the log ID.
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*/
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size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);
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/*
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* Set the log ID of an SCT to point directly to the *log_id specified.
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* The SCT takes ownership of the specified pointer.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
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/*
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* Set the log ID of an SCT.
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* This makes a copy of the log_id.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set1_log_id(SCT *sct, const unsigned char *log_id,
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size_t log_id_len);
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/*
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* Returns the timestamp for the SCT (epoch time in milliseconds).
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*/
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uint64_t SCT_get_timestamp(const SCT *sct);
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/*
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* Set the timestamp of an SCT (epoch time in milliseconds).
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*/
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void SCT_set_timestamp(SCT *sct, uint64_t timestamp);
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/*
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* Return the NID for the signature used by the SCT.
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* For CT v1, this will be either NID_sha256WithRSAEncryption or
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* NID_ecdsa_with_SHA256 (or NID_undef if incorrect/unset).
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*/
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int SCT_get_signature_nid(const SCT *sct);
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/*
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* Set the signature type of an SCT
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* For CT v1, this should be either NID_sha256WithRSAEncryption or
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* NID_ecdsa_with_SHA256.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set_signature_nid(SCT *sct, int nid);
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/*
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* Set *ext to point to the extension data for the SCT. ext must not be NULL.
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* The SCT retains ownership of this pointer.
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* Returns length of the data pointed to.
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*/
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size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);
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/*
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* Set the extensions of an SCT to point directly to the *ext specified.
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* The SCT takes ownership of the specified pointer.
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*/
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void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);
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/*
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* Set the extensions of an SCT.
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* This takes a copy of the ext.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set1_extensions(SCT *sct, const unsigned char *ext,
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size_t ext_len);
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/*
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* Set *sig to point to the signature for the SCT. sig must not be NULL.
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* The SCT retains ownership of this pointer.
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* Returns length of the data pointed to.
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*/
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size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);
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/*
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* Set the signature of an SCT to point directly to the *sig specified.
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* The SCT takes ownership of the specified pointer.
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*/
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void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);
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/*
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* Set the signature of an SCT to be a copy of the *sig specified.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set1_signature(SCT *sct, const unsigned char *sig,
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size_t sig_len);
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/*
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* The origin of this SCT, e.g. TLS extension, OCSP response, etc.
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*/
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sct_source_t SCT_get_source(const SCT *sct);
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/*
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* Set the origin of this SCT, e.g. TLS extension, OCSP response, etc.
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* Returns 1 on success, 0 otherwise.
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*/
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__owur int SCT_set_source(SCT *sct, sct_source_t source);
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/*
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* Returns a text string describing the validation status of |sct|.
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*/
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const char *SCT_validation_status_string(const SCT *sct);
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/*
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* Pretty-prints an |sct| to |out|.
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* It will be indented by the number of spaces specified by |indent|.
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* If |logs| is not NULL, it will be used to lookup the CT log that the SCT came
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* from, so that the log name can be printed.
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*/
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void SCT_print(const SCT *sct, BIO *out, int indent, const CTLOG_STORE *logs);
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/*
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* Pretty-prints an |sct_list| to |out|.
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* It will be indented by the number of spaces specified by |indent|.
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* SCTs will be delimited by |separator|.
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* If |logs| is not NULL, it will be used to lookup the CT log that each SCT
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* came from, so that the log names can be printed.
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*/
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void SCT_LIST_print(const STACK_OF(SCT) *sct_list, BIO *out, int indent,
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const char *separator, const CTLOG_STORE *logs);
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/*
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* Gets the last result of validating this SCT.
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* If it has not been validated yet, returns SCT_VALIDATION_STATUS_NOT_SET.
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*/
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sct_validation_status_t SCT_get_validation_status(const SCT *sct);
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/*
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* Validates the given SCT with the provided context.
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* Sets the "validation_status" field of the SCT.
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* Returns 1 if the SCT is valid and the signature verifies.
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* Returns 0 if the SCT is invalid or could not be verified.
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* Returns -1 if an error occurs.
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*/
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__owur int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx);
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/*
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* Validates the given list of SCTs with the provided context.
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* Sets the "validation_status" field of each SCT.
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* Returns 1 if there are no invalid SCTs and all signatures verify.
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* Returns 0 if at least one SCT is invalid or could not be verified.
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* Returns a negative integer if an error occurs.
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*/
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__owur int SCT_LIST_validate(const STACK_OF(SCT) *scts,
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CT_POLICY_EVAL_CTX *ctx);
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/*********************************
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* SCT parsing and serialisation *
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*********************************/
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/*
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* Serialize (to TLS format) a stack of SCTs and return the length.
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* "a" must not be NULL.
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* If "pp" is NULL, just return the length of what would have been serialized.
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* If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
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* for data that caller is responsible for freeing (only if function returns
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* successfully).
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* If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
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* that "*pp" is large enough to accept all of the serialized data.
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* Returns < 0 on error, >= 0 indicating bytes written (or would have been)
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* on success.
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*/
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__owur int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
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/*
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* Convert TLS format SCT list to a stack of SCTs.
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* If "a" or "*a" is NULL, a new stack will be created that the caller is
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* responsible for freeing (by calling SCT_LIST_free).
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* "**pp" and "*pp" must not be NULL.
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* Upon success, "*pp" will point to after the last bytes read, and a stack
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* will be returned.
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* Upon failure, a NULL pointer will be returned, and the position of "*pp" is
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* not defined.
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*/
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STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
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size_t len);
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/*
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* Serialize (to DER format) a stack of SCTs and return the length.
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* "a" must not be NULL.
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* If "pp" is NULL, just returns the length of what would have been serialized.
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* If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
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* for data that caller is responsible for freeing (only if function returns
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* successfully).
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* If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
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* that "*pp" is large enough to accept all of the serialized data.
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* Returns < 0 on error, >= 0 indicating bytes written (or would have been)
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* on success.
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*/
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__owur int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
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/*
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* Parses an SCT list in DER format and returns it.
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* If "a" or "*a" is NULL, a new stack will be created that the caller is
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* responsible for freeing (by calling SCT_LIST_free).
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* "**pp" and "*pp" must not be NULL.
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* Upon success, "*pp" will point to after the last bytes read, and a stack
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* will be returned.
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* Upon failure, a NULL pointer will be returned, and the position of "*pp" is
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* not defined.
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*/
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STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
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long len);
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/*
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* Serialize (to TLS format) an |sct| and write it to |out|.
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* If |out| is null, no SCT will be output but the length will still be returned.
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* If |out| points to a null pointer, a string will be allocated to hold the
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* TLS-format SCT. It is the responsibility of the caller to free it.
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* If |out| points to an allocated string, the TLS-format SCT will be written
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* to it.
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* The length of the SCT in TLS format will be returned.
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*/
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__owur int i2o_SCT(const SCT *sct, unsigned char **out);
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/*
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* Parses an SCT in TLS format and returns it.
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* If |psct| is not null, it will end up pointing to the parsed SCT. If it
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* already points to a non-null pointer, the pointer will be free'd.
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* |in| should be a pointer to a string containing the TLS-format SCT.
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* |in| will be advanced to the end of the SCT if parsing succeeds.
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* |len| should be the length of the SCT in |in|.
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* Returns NULL if an error occurs.
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* If the SCT is an unsupported version, only the SCT's 'sct' and 'sct_len'
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* fields will be populated (with |in| and |len| respectively).
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*/
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SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len);
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/********************
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* CT log functions *
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********************/
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/*
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* Creates a new CT log instance with the given |public_key| and |name|.
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* Takes ownership of |public_key| but copies |name|.
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* Returns NULL if malloc fails or if |public_key| cannot be converted to DER.
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* Should be deleted by the caller using CTLOG_free when no longer needed.
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*/
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CTLOG *CTLOG_new(EVP_PKEY *public_key, const char *name);
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/*
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* Creates a new CTLOG instance with the base64-encoded SubjectPublicKeyInfo DER
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* in |pkey_base64|. The |name| is a string to help users identify this log.
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* Returns 1 on success, 0 on failure.
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* Should be deleted by the caller using CTLOG_free when no longer needed.
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*/
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int CTLOG_new_from_base64(CTLOG ** ct_log,
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const char *pkey_base64, const char *name);
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/*
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* Deletes a CT log instance and its fields.
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*/
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void CTLOG_free(CTLOG *log);
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/* Gets the name of the CT log */
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const char *CTLOG_get0_name(const CTLOG *log);
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/* Gets the ID of the CT log */
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void CTLOG_get0_log_id(const CTLOG *log, const uint8_t **log_id,
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size_t *log_id_len);
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/* Gets the public key of the CT log */
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EVP_PKEY *CTLOG_get0_public_key(const CTLOG *log);
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/**************************
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* CT log store functions *
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**************************/
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/*
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* Creates a new CT log store.
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* Should be deleted by the caller using CTLOG_STORE_free when no longer needed.
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*/
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CTLOG_STORE *CTLOG_STORE_new(void);
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/*
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* Deletes a CT log store and all of the CT log instances held within.
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*/
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void CTLOG_STORE_free(CTLOG_STORE *store);
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/*
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* Finds a CT log in the store based on its log ID.
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* Returns the CT log, or NULL if no match is found.
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*/
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const CTLOG *CTLOG_STORE_get0_log_by_id(const CTLOG_STORE *store,
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const uint8_t *log_id,
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size_t log_id_len);
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/*
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* Loads a CT log list into a |store| from a |file|.
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* Returns 1 if loading is successful, or 0 otherwise.
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*/
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__owur int CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file);
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/*
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* Loads the default CT log list into a |store|.
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* Returns 1 if loading is successful, or 0 otherwise.
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*/
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__owur int CTLOG_STORE_load_default_file(CTLOG_STORE *store);
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# ifdef __cplusplus
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}
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# endif
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# endif
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#endif
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