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SSL_CTX_set1_sigalgs.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" 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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CTX_set1_sigalgs()\fR and \fBSSL_set1_sigalgs()\fR set the supported signature algorithms for \fBctx\fR or \fBssl\fR. The array \fBslist\fR of length \fBslistlen\fR must consist of pairs of NIDs corresponding to digest and public key algorithms. .PP \&\fBSSL_CTX_set1_sigalgs_list()\fR and \fBSSL_set1_sigalgs_list()\fR set the supported signature algorithms for \fBctx\fR or \fBssl\fR. The \fBstr\fR 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 \fB+\fR, or a \s-1TLS 1\s0.3\-style named SignatureScheme such as rsa_pss_pss_sha256. .PP \&\fBSSL_CTX_set1_client_sigalgs()\fR, \fBSSL_set1_client_sigalgs()\fR, \&\fBSSL_CTX_set1_client_sigalgs_list()\fR and \fBSSL_set1_client_sigalgs_list()\fR set signature algorithms related to client authentication, otherwise they are identical to \fBSSL_CTX_set1_sigalgs()\fR, \fBSSL_set1_sigalgs()\fR, \&\fBSSL_CTX_set1_sigalgs_list()\fR and \fBSSL_set1_sigalgs_list()\fR. .PP 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. .SH "NOTES" .IX Header "NOTES" 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 \s-1SSL_CONF API\s0 instead. .PP The signature algorithms set by a client are used directly in the supported signature algorithm in the client hello message. .PP 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 \s-1SSL_OP_CIPHER_SERVER_PREFERENCE\s0) their order. .PP 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. .PP Similarly client authentication signature algorithms set by a client are used to determined the set of client authentication shared signature algorithms. .PP Signature algorithms will neither be advertised nor used if the security level prohibits them (for example \s-1SHA1\s0 if the security level is 4 or more). .PP 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 \&\s-1EVP_PKEY_RSA, EVP_PKEY_RSA_PSS, EVP_PKEY_DSA\s0 and \s-1EVP_PKEY_EC.\s0 .PP The short or long name values for digests can be used in a string (for example \*(L"\s-1MD5\*(R", \*(L"SHA1\*(R", \*(L"SHA224\*(R", \*(L"SHA256\*(R", \*(L"SHA384\*(R", \*(L"SHA512\*(R"\s0) and the public key algorithm strings \*(L"\s-1RSA\*(R",\s0 \*(L"RSA-PSS\*(R", \*(L"\s-1DSA\*(R"\s0 or \*(L"\s-1ECDSA\*(R".\s0 .PP The \s-1TLS 1.3\s0 signature scheme names (such as \*(L"rsa_pss_pss_sha256\*(R") can also be used with the \fB_list\fR forms of the \s-1API.\s0 .PP The use of \s-1MD5\s0 as a digest is strongly discouraged due to security weaknesses. .SH "RETURN VALUES" .IX Header "RETURN VALUES" All these functions return 1 for success and 0 for failure. .SH "EXAMPLES" .IX Header "EXAMPLES" Set supported signature algorithms to \s-1SHA256\s0 with \s-1ECDSA\s0 and \s-1SHA256\s0 with \s-1RSA\s0 using an array: .PP .Vb 1 \& const int slist[] = {NID_sha256, EVP_PKEY_EC, NID_sha256, EVP_PKEY_RSA}; \& \& SSL_CTX_set1_sigalgs(ctx, slist, 4); .Ve .PP Set supported signature algorithms to \s-1SHA256\s0 with \s-1ECDSA\s0 and \s-1SHA256\s0 with \s-1RSA\s0 using a string: .PP .Vb 1 \& SSL_CTX_set1_sigalgs_list(ctx, "ECDSA+SHA256:RSA+SHA256"); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\|(7), \fBSSL_get_shared_sigalgs\fR\|(3), \&\fBSSL_CONF_CTX_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2015\-2019 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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