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Editing: CT_POLICY_EVAL_CTX_free.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" CT_POLICY_EVAL_CTX_new, CT_POLICY_EVAL_CTX_free, CT_POLICY_EVAL_CTX_get0_cert, CT_POLICY_EVAL_CTX_set1_cert, CT_POLICY_EVAL_CTX_get0_issuer, CT_POLICY_EVAL_CTX_set1_issuer, CT_POLICY_EVAL_CTX_get0_log_store, CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE, CT_POLICY_EVAL_CTX_get_time, CT_POLICY_EVAL_CTX_set_time \- Encapsulates the data required to evaluate whether SCTs meet a Certificate Transparency policy .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ct.h> \& \& CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void); \& void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx); \& X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx); \& int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert); \& X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx); \& int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer); \& const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx); \& void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx, \& CTLOG_STORE *log_store); \& uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx); \& void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \fB\s-1CT_POLICY_EVAL_CTX\s0\fR is used by functions that evaluate whether Signed Certificate Timestamps (SCTs) fulfil a Certificate Transparency (\s-1CT\s0) policy. This policy may be, for example, that at least one valid \s-1SCT\s0 is available. To determine this, an \s-1SCT\s0's timestamp and signature must be verified. This requires: .IP "\(bu" 2 the public key of the log that issued the \s-1SCT\s0 .IP "\(bu" 2 the certificate that the \s-1SCT\s0 was issued for .IP "\(bu" 2 the issuer certificate (if the \s-1SCT\s0 was issued for a pre-certificate) .IP "\(bu" 2 the current time .PP The above requirements are met using the setters described below. .PP \&\fBCT_POLICY_EVAL_CTX_new()\fR creates an empty policy evaluation context. This should then be populated using: .IP "\(bu" 2 \&\fBCT_POLICY_EVAL_CTX_set1_cert()\fR to provide the certificate the SCTs were issued for .Sp Increments the reference count of the certificate. .IP "\(bu" 2 \&\fBCT_POLICY_EVAL_CTX_set1_issuer()\fR to provide the issuer certificate .Sp Increments the reference count of the certificate. .IP "\(bu" 2 \&\fBCT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE()\fR to provide a list of logs that are trusted as sources of SCTs .Sp Holds a pointer to the \s-1CTLOG_STORE,\s0 so the \s-1CTLOG_STORE\s0 must outlive the \&\s-1CT_POLICY_EVAL_CTX.\s0 .IP "\(bu" 2 \&\fBCT_POLICY_EVAL_CTX_set_time()\fR to set the time SCTs should be compared with to determine if they are valid .Sp The \s-1SCT\s0 timestamp will be compared to this time to check whether the \s-1SCT\s0 was issued in the future. \s-1RFC6962\s0 states that \*(L"\s-1TLS\s0 clients \s-1MUST\s0 reject SCTs whose timestamp is in the future\*(R". By default, this will be set to 5 minutes in the future (e.g. (\fBtime()\fR + 300) * 1000), to allow for clock drift. .Sp The time should be in milliseconds since the Unix epoch. .PP Each setter has a matching getter for accessing the current value. .PP When no longer required, the \fB\s-1CT_POLICY_EVAL_CTX\s0\fR should be passed to \&\fBCT_POLICY_EVAL_CTX_free()\fR to delete it. .SH "NOTES" .IX Header "NOTES" The issuer certificate only needs to be provided if at least one of the SCTs was issued for a pre-certificate. This will be the case for SCTs embedded in a certificate (i.e. those in an X.509 extension), but may not be the case for SCTs found in the \s-1TLS SCT\s0 extension or \s-1OCSP\s0 response. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBCT_POLICY_EVAL_CTX_new()\fR will return \s-1NULL\s0 if malloc fails. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBct\fR\|(7) .SH "HISTORY" .IX Header "HISTORY" These functions were added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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