5 SSL_CTX_set1_sigalgs, SSL_set1_sigalgs, SSL_CTX_set1_sigalgs_list,
6 SSL_set1_sigalgs_list, SSL_CTX_set1_client_sigalgs,
7 SSL_set1_client_sigalgs, SSL_CTX_set1_client_sigalgs_list,
8 SSL_set1_client_sigalgs_list - set supported signature algorithms
12 #include <openssl/ssl.h>
14 long SSL_CTX_set1_sigalgs(SSL_CTX *ctx, const int *slist, long slistlen);
15 long SSL_set1_sigalgs(SSL *ssl, const int *slist, long slistlen);
16 long SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str);
17 long SSL_set1_sigalgs_list(SSL *ssl, const char *str);
19 long SSL_CTX_set1_client_sigalgs(SSL_CTX *ctx, const int *slist, long slistlen);
20 long SSL_set1_client_sigalgs(SSL *ssl, const int *slist, long slistlen);
21 long SSL_CTX_set1_client_sigalgs_list(SSL_CTX *ctx, const char *str);
22 long SSL_set1_client_sigalgs_list(SSL *ssl, const char *str);
26 SSL_CTX_set1_sigalgs() and SSL_set1_sigalgs() set the supported signature
27 algorithms for B<ctx> or B<ssl>. The array B<slist> of length B<slistlen>
28 must consist of pairs of NIDs corresponding to digest and public key
31 SSL_CTX_set1_sigalgs_list() and SSL_set1_sigalgs_list() set the supported
32 signature algorithms for B<ctx> or B<ssl>. The B<str> parameter
33 must be a null terminated string consisting of a colon separated list of
34 elements, where each element is either a combination of a public key
35 algorithm and a digest separated by B<+>, or a TLS 1.3-style named
36 SignatureScheme such as rsa_pss_pss_sha256.
38 SSL_CTX_set1_client_sigalgs(), SSL_set1_client_sigalgs(),
39 SSL_CTX_set1_client_sigalgs_list() and SSL_set1_client_sigalgs_list() set
40 signature algorithms related to client authentication, otherwise they are
41 identical to SSL_CTX_set1_sigalgs(), SSL_set1_sigalgs(),
42 SSL_CTX_set1_sigalgs_list() and SSL_set1_sigalgs_list().
44 All these functions are implemented as macros. The signature algorithm
45 parameter (integer array or string) is not freed: the application should
46 free it, if necessary.
50 If an application wishes to allow the setting of signature algorithms
51 as one of many user configurable options it should consider using the more
52 flexible SSL_CONF API instead.
54 The signature algorithms set by a client are used directly in the supported
55 signature algorithm in the client hello message.
57 The supported signature algorithms set by a server are not sent to the
58 client but are used to determine the set of shared signature algorithms
59 and (if server preferences are set with SSL_OP_CIPHER_SERVER_PREFERENCE)
62 The client authentication signature algorithms set by a server are sent
63 in a certificate request message if client authentication is enabled,
64 otherwise they are unused.
66 Similarly client authentication signature algorithms set by a client are
67 used to determined the set of client authentication shared signature
70 Signature algorithms will neither be advertised nor used if the security level
71 prohibits them (for example SHA1 if the security level is 4 or more).
73 Currently the NID_md5, NID_sha1, NID_sha224, NID_sha256, NID_sha384 and
74 NID_sha512 digest NIDs are supported and the public key algorithm NIDs
75 EVP_PKEY_RSA, EVP_PKEY_RSA_PSS, EVP_PKEY_DSA and EVP_PKEY_EC.
77 The short or long name values for digests can be used in a string (for
78 example "MD5", "SHA1", "SHA224", "SHA256", "SHA384", "SHA512") and
79 the public key algorithm strings "RSA", "RSA-PSS", "DSA" or "ECDSA".
81 The TLS 1.3 signature scheme names (such as "rsa_pss_pss_sha256") can also
82 be used with the B<_list> forms of the API.
84 The use of MD5 as a digest is strongly discouraged due to security weaknesses.
88 All these functions return 1 for success and 0 for failure.
92 Set supported signature algorithms to SHA256 with ECDSA and SHA256 with RSA
95 const int slist[] = {NID_sha256, EVP_PKEY_EC, NID_sha256, EVP_PKEY_RSA};
97 SSL_CTX_set1_sigalgs(ctx, slist, 4);
99 Set supported signature algorithms to SHA256 with ECDSA and SHA256 with RSA
102 SSL_CTX_set1_sigalgs_list(ctx, "ECDSA+SHA256:RSA+SHA256");
106 L<ssl(7)>, L<SSL_get_shared_sigalgs(3)>,
107 L<SSL_CONF_CTX_new(3)>
111 Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
113 Licensed under the Apache License 2.0 (the "License"). You may not use
114 this file except in compliance with the License. You can obtain a copy
115 in the file LICENSE in the source distribution or at
116 L<https://www.openssl.org/source/license.html>.