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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" X509_sign, X509_sign_ctx, X509_verify, X509_REQ_sign, X509_REQ_sign_ctx, X509_REQ_verify, X509_CRL_sign, X509_CRL_sign_ctx, X509_CRL_verify \- sign or verify certificate, certificate request or CRL signature .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/x509.h> \& \& int X509_sign(X509 *x, EVP_PKEY *pkey, const EVP_MD *md); \& int X509_sign_ctx(X509 *x, EVP_MD_CTX *ctx); \& int X509_verify(X509 *a, EVP_PKEY *r); \& \& int X509_REQ_sign(X509_REQ *x, EVP_PKEY *pkey, const EVP_MD *md); \& int X509_REQ_sign_ctx(X509_REQ *x, EVP_MD_CTX *ctx); \& int X509_REQ_verify(X509_REQ *a, EVP_PKEY *r); \& \& int X509_CRL_sign(X509_CRL *x, EVP_PKEY *pkey, const EVP_MD *md); \& int X509_CRL_sign_ctx(X509_CRL *x, EVP_MD_CTX *ctx); \& int X509_CRL_verify(X509_CRL *a, EVP_PKEY *r); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBX509_sign()\fR signs certificate \fBx\fR using private key \fBpkey\fR and message digest \fBmd\fR and sets the signature in \fBx\fR. \fBX509_sign_ctx()\fR also signs certificate \fBx\fR but uses the parameters contained in digest context \fBctx\fR. .PP \&\fBX509_verify()\fR verifies the signature of certificate \fBx\fR using public key \&\fBpkey\fR. Only the signature is checked: no other checks (such as certificate chain validity) are performed. .PP \&\fBX509_REQ_sign()\fR, \fBX509_REQ_sign_ctx()\fR, \fBX509_REQ_verify()\fR, \&\fBX509_CRL_sign()\fR, \fBX509_CRL_sign_ctx()\fR and \fBX509_CRL_verify()\fR sign and verify certificate requests and CRLs respectively. .SH "NOTES" .IX Header "NOTES" \&\fBX509_sign_ctx()\fR is used where the default parameters for the corresponding public key and digest are not suitable. It can be used to sign keys using RSA-PSS for example. .PP For efficiency reasons and to work around \s-1ASN.1\s0 encoding issues the encoding of the signed portion of a certificate, certificate request and \s-1CRL\s0 is cached internally. If the signed portion of the structure is modified the encoding is not always updated meaning a stale version is sometimes used. This is not normally a problem because modifying the signed portion will invalidate the signature and signing will always update the encoding. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBX509_sign()\fR, \fBX509_sign_ctx()\fR, \fBX509_REQ_sign()\fR, \fBX509_REQ_sign_ctx()\fR, \&\fBX509_CRL_sign()\fR and \fBX509_CRL_sign_ctx()\fR return the size of the signature in bytes for success and zero for failure. .PP \&\fBX509_verify()\fR, \fBX509_REQ_verify()\fR and \fBX509_CRL_verify()\fR return 1 if the signature is valid and 0 if the signature check fails. If the signature could not be checked at all because it was invalid or some other error occurred then \-1 is returned. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBd2i_X509\fR\|(3), \&\fBERR_get_error\fR\|(3), \&\fBX509_CRL_get0_by_serial\fR\|(3), \&\fBX509_get0_signature\fR\|(3), \&\fBX509_get_ext_d2i\fR\|(3), \&\fBX509_get_extension_flags\fR\|(3), \&\fBX509_get_pubkey\fR\|(3), \&\fBX509_get_subject_name\fR\|(3), \&\fBX509_get_version\fR\|(3), \&\fBX509_NAME_add_entry_by_txt\fR\|(3), \&\fBX509_NAME_ENTRY_get_object\fR\|(3), \&\fBX509_NAME_get_index_by_NID\fR\|(3), \&\fBX509_NAME_print_ex\fR\|(3), \&\fBX509_new\fR\|(3), \&\fBX509V3_get_d2i\fR\|(3), \&\fBX509_verify_cert\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The \fBX509_sign()\fR, \fBX509_REQ_sign()\fR and \fBX509_CRL_sign()\fR functions are available in all versions of OpenSSL. .PP The \fBX509_sign_ctx()\fR, \fBX509_REQ_sign_ctx()\fR and \fBX509_CRL_sign_ctx()\fR functions were added OpenSSL 1.0.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2015\-2016 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>.