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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>SSL_CTX_set1_sigalgs</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#NOTES">NOTES</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#EXAMPLES">EXAMPLES</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>SSL_CTX_set1_sigalgs, SSL_set1_sigalgs, SSL_CTX_set1_sigalgs_list, SSL_set1_sigalgs_list, SSL_CTX_set1_client_sigalgs, SSL_set1_client_sigalgs, SSL_CTX_set1_client_sigalgs_list, SSL_set1_client_sigalgs_list - set supported signature algorithms</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/ssl.h> long SSL_CTX_set1_sigalgs(SSL_CTX *ctx, const int *slist, long slistlen); long SSL_set1_sigalgs(SSL *ssl, const int *slist, long slistlen); long SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str); long SSL_set1_sigalgs_list(SSL *ssl, const char *str); long SSL_CTX_set1_client_sigalgs(SSL_CTX *ctx, const int *slist, long slistlen); long SSL_set1_client_sigalgs(SSL *ssl, const int *slist, long slistlen); long SSL_CTX_set1_client_sigalgs_list(SSL_CTX *ctx, const char *str); long SSL_set1_client_sigalgs_list(SSL *ssl, const char *str);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>SSL_CTX_set1_sigalgs() and SSL_set1_sigalgs() set the supported signature algorithms for <b>ctx</b> or <b>ssl</b>. The array <b>slist</b> of length <b>slistlen</b> must consist of pairs of NIDs corresponding to digest and public key algorithms.</p> <p>SSL_CTX_set1_sigalgs_list() and SSL_set1_sigalgs_list() set the supported signature algorithms for <b>ctx</b> or <b>ssl</b>. The <b>str</b> parameter must be a null terminated string consisting of a colon separated list of elements, where each element is either a combination of a public key algorithm and a digest separated by <b>+</b>, or a TLS 1.3-style named SignatureScheme such as rsa_pss_pss_sha256.</p> <p>SSL_CTX_set1_client_sigalgs(), SSL_set1_client_sigalgs(), SSL_CTX_set1_client_sigalgs_list() and SSL_set1_client_sigalgs_list() set signature algorithms related to client authentication, otherwise they are identical to SSL_CTX_set1_sigalgs(), SSL_set1_sigalgs(), SSL_CTX_set1_sigalgs_list() and SSL_set1_sigalgs_list().</p> <p>All these functions are implemented as macros. The signature algorithm parameter (integer array or string) is not freed: the application should free it, if necessary.</p> <h1 id="NOTES">NOTES</h1> <p>If an application wishes to allow the setting of signature algorithms as one of many user configurable options it should consider using the more flexible SSL_CONF API instead.</p> <p>The signature algorithms set by a client are used directly in the supported signature algorithm in the client hello message.</p> <p>The supported signature algorithms set by a server are not sent to the client but are used to determine the set of shared signature algorithms and (if server preferences are set with SSL_OP_CIPHER_SERVER_PREFERENCE) their order.</p> <p>The client authentication signature algorithms set by a server are sent in a certificate request message if client authentication is enabled, otherwise they are unused.</p> <p>Similarly client authentication signature algorithms set by a client are used to determined the set of client authentication shared signature algorithms.</p> <p>Signature algorithms will neither be advertised nor used if the security level prohibits them (for example SHA1 if the security level is 4 or more).</p> <p>Currently the NID_md5, NID_sha1, NID_sha224, NID_sha256, NID_sha384 and NID_sha512 digest NIDs are supported and the public key algorithm NIDs EVP_PKEY_RSA, EVP_PKEY_RSA_PSS, EVP_PKEY_DSA and EVP_PKEY_EC.</p> <p>The short or long name values for digests can be used in a string (for example "MD5", "SHA1", "SHA224", "SHA256", "SHA384", "SHA512") and the public key algorithm strings "RSA", "RSA-PSS", "DSA" or "ECDSA".</p> <p>The TLS 1.3 signature scheme names (such as "rsa_pss_pss_sha256") can also be used with the <b>_list</b> forms of the API.</p> <p>The use of MD5 as a digest is strongly discouraged due to security weaknesses.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>All these functions return 1 for success and 0 for failure.</p> <h1 id="EXAMPLES">EXAMPLES</h1> <p>Set supported signature algorithms to SHA256 with ECDSA and SHA256 with RSA using an array:</p> <pre><code> const int slist[] = {NID_sha256, EVP_PKEY_EC, NID_sha256, EVP_PKEY_RSA}; SSL_CTX_set1_sigalgs(ctx, slist, 4);</code></pre> <p>Set supported signature algorithms to SHA256 with ECDSA and SHA256 with RSA using a string:</p> <pre><code> SSL_CTX_set1_sigalgs_list(ctx, "ECDSA+SHA256:RSA+SHA256");</code></pre> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man7/ssl.html">ssl(7)</a>, <a href="../man3/SSL_get_shared_sigalgs.html">SSL_get_shared_sigalgs(3)</a>, <a href="../man3/SSL_CONF_CTX_new.html">SSL_CONF_CTX_new(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>