118 lines
4.4 KiB
Text
118 lines
4.4 KiB
Text
=pod
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=head1 NAME
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SSL_CTX_set1_sigalgs, SSL_set1_sigalgs, SSL_CTX_set1_sigalgs_list,
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SSL_set1_sigalgs_list, SSL_CTX_set1_client_sigalgs,
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SSL_set1_client_sigalgs, SSL_CTX_set1_client_sigalgs_list,
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SSL_set1_client_sigalgs_list - set supported signature algorithms
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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long SSL_CTX_set1_sigalgs(SSL_CTX *ctx, const int *slist, long slistlen);
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long SSL_set1_sigalgs(SSL *ssl, const int *slist, long slistlen);
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long SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str);
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long SSL_set1_sigalgs_list(SSL *ssl, const char *str);
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long SSL_CTX_set1_client_sigalgs(SSL_CTX *ctx, const int *slist, long slistlen);
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long SSL_set1_client_sigalgs(SSL *ssl, const int *slist, long slistlen);
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long SSL_CTX_set1_client_sigalgs_list(SSL_CTX *ctx, const char *str);
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long SSL_set1_client_sigalgs_list(SSL *ssl, const char *str);
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=head1 DESCRIPTION
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SSL_CTX_set1_sigalgs() and SSL_set1_sigalgs() set the supported signature
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algorithms for B<ctx> or B<ssl>. The array B<slist> of length B<slistlen>
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must consist of pairs of NIDs corresponding to digest and public key
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algorithms.
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SSL_CTX_set1_sigalgs_list() and SSL_set1_sigalgs_list() set the supported
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signature algorithms for B<ctx> or B<ssl>. The B<str> parameter
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must be a null terminated string consisting of a colon separated list of
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elements, where each element is either a combination of a public key
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algorithm and a digest separated by B<+>, or a TLS 1.3-style named
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SignatureScheme such as rsa_pss_pss_sha256.
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SSL_CTX_set1_client_sigalgs(), SSL_set1_client_sigalgs(),
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SSL_CTX_set1_client_sigalgs_list() and SSL_set1_client_sigalgs_list() set
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signature algorithms related to client authentication, otherwise they are
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identical to SSL_CTX_set1_sigalgs(), SSL_set1_sigalgs(),
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SSL_CTX_set1_sigalgs_list() and SSL_set1_sigalgs_list().
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All these functions are implemented as macros. The signature algorithm
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parameter (integer array or string) is not freed: the application should
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free it, if necessary.
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=head1 NOTES
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If an application wishes to allow the setting of signature algorithms
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as one of many user configurable options it should consider using the more
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flexible SSL_CONF API instead.
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The signature algorithms set by a client are used directly in the supported
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signature algorithm in the client hello message.
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The supported signature algorithms set by a server are not sent to the
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client but are used to determine the set of shared signature algorithms
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and (if server preferences are set with SSL_OP_CIPHER_SERVER_PREFERENCE)
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their order.
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The client authentication signature algorithms set by a server are sent
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in a certificate request message if client authentication is enabled,
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otherwise they are unused.
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Similarly client authentication signature algorithms set by a client are
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used to determined the set of client authentication shared signature
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algorithms.
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Signature algorithms will neither be advertised nor used if the security level
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prohibits them (for example SHA1 if the security level is 4 or more).
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Currently the NID_md5, NID_sha1, NID_sha224, NID_sha256, NID_sha384 and
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NID_sha512 digest NIDs are supported and the public key algorithm NIDs
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EVP_PKEY_RSA, EVP_PKEY_RSA_PSS, EVP_PKEY_DSA and EVP_PKEY_EC.
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The short or long name values for digests can be used in a string (for
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example "MD5", "SHA1", "SHA224", "SHA256", "SHA384", "SHA512") and
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the public key algorithm strings "RSA", "RSA-PSS", "DSA" or "ECDSA".
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The TLS 1.3 signature scheme names (such as "rsa_pss_pss_sha256") can also
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be used with the B<_list> forms of the API.
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The use of MD5 as a digest is strongly discouraged due to security weaknesses.
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=head1 EXAMPLES
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Set supported signature algorithms to SHA256 with ECDSA and SHA256 with RSA
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using an array:
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const int slist[] = {NID_sha256, EVP_PKEY_EC, NID_sha256, EVP_PKEY_RSA};
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SSL_CTX_set1_sigalgs(ctx, slist, 4);
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Set supported signature algorithms to SHA256 with ECDSA and SHA256 with RSA
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using a string:
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SSL_CTX_set1_sigalgs_list(ctx, "ECDSA+SHA256:RSA+SHA256");
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=head1 RETURN VALUES
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All these functions return 1 for success and 0 for failure.
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=head1 SEE ALSO
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L<ssl(7)>, L<SSL_get_shared_sigalgs(3)>,
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L<SSL_CONF_CTX_new(3)>
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=head1 COPYRIGHT
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Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
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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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L<https://www.openssl.org/source/license.html>.
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=cut
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