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227 lines
6.5 KiB
Plaintext
227 lines
6.5 KiB
Plaintext
=pod
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=head1 NAME
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SCT_new, SCT_new_from_base64, SCT_free, SCT_LIST_free,
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SCT_get_version, SCT_set_version,
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SCT_get_log_entry_type, SCT_set_log_entry_type,
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SCT_get0_log_id, SCT_set0_log_id, SCT_set1_log_id,
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SCT_get_timestamp, SCT_set_timestamp,
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SCT_get_signature_nid, SCT_set_signature_nid,
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SCT_get0_signature, SCT_set0_signature, SCT_set1_signature,
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SCT_get0_extensions, SCT_set0_extensions, SCT_set1_extensions,
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SCT_get_source, SCT_set_source
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- A Certificate Transparency Signed Certificate Timestamp
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=head1 SYNOPSIS
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#include <openssl/ct.h>
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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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SCT *SCT_new(void);
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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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void SCT_free(SCT *sct);
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void SCT_LIST_free(STACK_OF(SCT) *a);
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sct_version_t SCT_get_version(const SCT *sct);
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int SCT_set_version(SCT *sct, sct_version_t version);
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ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);
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int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
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size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);
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int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
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int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len);
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uint64_t SCT_get_timestamp(const SCT *sct);
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void SCT_set_timestamp(SCT *sct, uint64_t timestamp);
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int SCT_get_signature_nid(const SCT *sct);
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int SCT_set_signature_nid(SCT *sct, int nid);
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size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);
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void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);
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int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len);
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size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);
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void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);
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int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len);
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sct_source_t SCT_get_source(const SCT *sct);
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int SCT_set_source(SCT *sct, sct_source_t source);
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=head1 DESCRIPTION
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Signed Certificate Timestamps (SCTs) are defined by RFC 6962, Section 3.2.
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They constitute a promise by a Certificate Transparency (CT) log to publicly
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record a certificate. By cryptographically verifying that a log did indeed issue
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an SCT, some confidence can be gained that the certificate is publicly known.
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An internal representation of an SCT can be created in one of two ways.
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The first option is to create a blank SCT, using SCT_new(), and then populate
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it using:
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=over 2
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=item *
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SCT_set_version() to set the SCT version.
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Only SCT_VERSION_V1 is currently supported.
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=item *
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SCT_set_log_entry_type() to set the type of certificate the SCT was issued for:
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B<CT_LOG_ENTRY_TYPE_X509> for a normal certificate.
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B<CT_LOG_ENTRY_TYPE_PRECERT> for a pre-certificate.
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=item *
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SCT_set0_log_id() or SCT_set1_log_id() to set the LogID of the CT log that the SCT came from.
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The former takes ownership, whereas the latter makes a copy.
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See RFC 6962, Section 3.2 for the definition of LogID.
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=item *
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SCT_set_timestamp() to set the time the SCT was issued (time in milliseconds
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since the Unix Epoch).
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=item *
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SCT_set_signature_nid() to set the NID of the signature.
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=item *
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SCT_set0_signature() or SCT_set1_signature() to set the raw signature value.
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The former takes ownership, whereas the latter makes a copy.
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=item *
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SCT_set0_extensions() or B<SCT_set1_extensions> to provide SCT extensions.
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The former takes ownership, whereas the latter makes a copy.
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=back
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Alternatively, the SCT can be pre-populated from the following data using
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SCT_new_from_base64():
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=over 2
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=item *
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The SCT version (only SCT_VERSION_V1 is currently supported).
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=item *
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The LogID (see RFC 6962, Section 3.2), base64 encoded.
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=item *
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The type of certificate the SCT was issued for:
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B<CT_LOG_ENTRY_TYPE_X509> for a normal certificate.
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B<CT_LOG_ENTRY_TYPE_PRECERT> for a pre-certificate.
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=item *
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The time that the SCT was issued (time in milliseconds since the Unix Epoch).
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=item *
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The SCT extensions, base64 encoded.
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=item *
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The SCT signature, base64 encoded.
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=back
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SCT_set_source() can be used to record where the SCT was found
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(TLS extension, X.509 certificate extension or OCSP response). This is not
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required for verifying the SCT.
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SCT_free() frees the specified SCT.
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If the argument is NULL, nothing is done.
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SCT_LIST_free() frees the specified stack of SCTs.
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If the argument is NULL, nothing is done.
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=head1 NOTES
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Some of the setters return int, instead of void. These will all return 1 on
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success, 0 on failure. They will not make changes on failure.
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All of the setters will reset the validation status of the SCT to
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SCT_VALIDATION_STATUS_NOT_SET (see L<SCT_validate(3)>).
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SCT_set_source() will call SCT_set_log_entry_type() if the type of
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certificate the SCT was issued for can be inferred from where the SCT was found.
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For example, an SCT found in an X.509 extension must have been issued for a pre-
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certificate.
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SCT_set_source() will not refuse unknown values.
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=head1 RETURN VALUES
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SCT_set_version() returns 1 if the specified version is supported, 0 otherwise.
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SCT_set_log_entry_type() returns 1 if the specified log entry type is supported, 0 otherwise.
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SCT_set0_log_id() and B<SCT_set1_log_id> return 1 if the specified LogID is a
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valid SHA-256 hash, 0 otherwise. Additionally, B<SCT_set1_log_id> returns 0 if
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malloc fails.
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B<SCT_set_signature_nid> returns 1 if the specified NID is supported, 0 otherwise.
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B<SCT_set1_extensions> and B<SCT_set1_signature> return 1 if the supplied buffer
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is copied successfully, 0 otherwise (i.e. if malloc fails).
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B<SCT_set_source> returns 1 on success, 0 otherwise.
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=head1 SEE ALSO
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L<ct(7)>,
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L<SCT_validate(3)>,
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L<OBJ_nid2obj(3)>
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=head1 HISTORY
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These functions were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2016-2024 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (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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L<https://www.openssl.org/source/license.html>.
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=cut
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