[openssl-commits] [openssl] master update

[Dr. Stephen Henson]

The branch master has been updated
       via  8a00dbd83e24b00f24429ae57f56102916c8704f (commit)
      from  9f040d6decca7930e978784c917f731e5c45e8f0 (commit)


- Log -----------------------------------------------------------------
commit 8a00dbd83e24b00f24429ae57f56102916c8704f
Author: Dr. Stephen Henson <steve at openssl.org>
Date:   Wed Jul 22 16:11:55 2015 +0100

    Document shared sigalgs functions.
    
    Reviewed-by: Tim Hudson <tjh at openssl.org>

-----------------------------------------------------------------------

Summary of changes:
 doc/ssl/SSL_get_shared_sigalgs.pod | 77 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 doc/ssl/SSL_get_shared_sigalgs.pod

diff --git a/doc/ssl/SSL_get_shared_sigalgs.pod b/doc/ssl/SSL_get_shared_sigalgs.pod
new file mode 100644
index 0000000..16f7d48
--- /dev/null
+++ b/doc/ssl/SSL_get_shared_sigalgs.pod
@@ -0,0 +1,77 @@
+=pod
+
+=head1 NAME
+
+SSL_get_shared_sigalgs, SSL_get_sigalgs - get supported signature algorithms
+
+=head1 SYNOPSIS
+
+ #include <openssl/ssl.h>
+
+ int SSL_get_shared_sigalgs(SSL *s, int idx,
+                            int *psign, int *phash, int *psignhash,
+                            unsigned char *rsig, unsigned char *rhash);
+
+ int SSL_get_sigalgs(SSL *s, int idx,
+                     int *psign, int *phash, int *psignhash,
+                     unsigned char *rsig, unsigned char *rhash);
+
+=head1 DESCRIPTION
+
+SSL_get_shared_sigalgs() returns information about the shared signature
+algorithms supported by peer B<s>. The parameter B<idx> indicates the index
+of the shared signature algorithm to return starting from zero. The signature
+algorithm NID is written to B<*psign>, the hash NID to B<*phash> and the
+sign and hash NID to B<*psignhash>. The raw signature and hash values
+are written to B<*rsig> and B<*rhash>.
+
+SSL_get_sigalgs() is similar to SSL_get_shared_sigalgs() except it returns
+information about all signature algorithms supported by B<s> in the order
+they were sent by the peer.
+
+=head1 RETURN VALUES
+
+SSL_get_shared_sigalgs() and SSL_get_sigalgs() return the number of
+signature algorithms or B<0> if the B<idx> parameter is out of range.
+
+=head1 NOTES
+
+These functions are typically called for debugging purposes (to report
+the peer's preferences) or where an application wants finer control over
+certificate selection. Most applications will rely on internal handling
+and will not need to call them.
+
+If an application is only interested in the highest preference shared
+signature algorithm it can just set B<idx> to zero.
+
+Any or all of the parameters B<psign>, B<phash>, B<psignhash>, B<rsig> or
+B<rhash> can be set to B<NULL> if the value is not required. By setting
+them all to B<NULL> and setting B<idx> to zero the total number of
+signature algorithms can be determined: which can be zero.
+
+These functions must be called after the peer has sent a list of supported
+signature algorithms: after a client hello (for servers) or a certificate
+request (for clients). They can (for example) be called in the certificate
+callback.
+
+Only TLS 1.2 and DTLS 1.2 currently support signature algorithms. If these
+functions are called on an earlier version of TLS or DTLS zero is returned.
+
+The shared signature algorithms returned by SSL_get_shared_sigalgs() are
+ordered according to configuration and peer preferences.
+
+The raw values correspond to the on the wire form as defined by RFC5246 et al.
+The NIDs are OpenSSL equivalents. For example if the peer sent sha256(4) and
+rsa(1) then B<*rhash> would be 4, B<*rsign> 1, B<*phash> NID_sha256, B<*psig>
+NID_rsaEncryption and B<*psighash> NID_sha256WithRSAEncryption.
+
+If a signature algorithm is not recognised the corresponsing NIDs
+will be set to B<NID_undef>. This may be because the value is not supported
+or is not an appropriate combination (for example MD5 and DSA).
+
+=head1 SEE ALSO
+
+L<SSL_CTX_set_cert_cb(3)|SSL_CTX_set_cert_cb(3)>,
+L<ssl(3)|ssl(3)>
+
+=cut