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Title "X509_SIGN 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 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 Header "DESCRIPTION" \fBX509_sign() signs certificate x using private key pkey and message digest md and sets the signature in x. X509_sign_ctx() also signs certificate x but uses the parameters contained in digest context ctx.

\fBX509_verify() verifies the signature of certificate x using public key \fBpkey. Only the signature is checked: no other checks (such as certificate chain validity) are performed.

\fBX509_REQ_sign(), X509_REQ_sign_ctx(), X509_REQ_verify(), \fBX509_CRL_sign(), X509_CRL_sign_ctx() and X509_CRL_verify() sign and verify certificate requests and CRLs respectively.

Header "NOTES" \fBX509_sign_ctx() 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.

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.

Header "RETURN VALUES" \fBX509_sign(), X509_sign_ctx(), X509_REQ_sign(), X509_REQ_sign_ctx(), \fBX509_CRL_sign() and X509_CRL_sign_ctx() return the size of the signature in bytes for success and zero for failure.

\fBX509_verify(), X509_REQ_verify() and X509_CRL_verify() 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.

Header "SEE ALSO" \fBd2i_X509\|(3), \fBERR_get_error\|(3), \fBX509_CRL_get0_by_serial\|(3), \fBX509_get0_signature\|(3), \fBX509_get_ext_d2i\|(3), \fBX509_get_extension_flags\|(3), \fBX509_get_pubkey\|(3), \fBX509_get_subject_name\|(3), \fBX509_get_version\|(3), \fBX509_NAME_add_entry_by_txt\|(3), \fBX509_NAME_ENTRY_get_object\|(3), \fBX509_NAME_get_index_by_NID\|(3), \fBX509_NAME_print_ex\|(3), \fBX509_new\|(3), \fBX509V3_get_d2i\|(3), \fBX509_verify_cert\|(3) Header "HISTORY" The X509_sign(), X509_REQ_sign() and X509_CRL_sign() functions are available in all versions of OpenSSL.

The X509_sign_ctx(), X509_REQ_sign_ctx() and X509_CRL_sign_ctx() functions were added OpenSSL 1.0.1.

Header "COPYRIGHT" Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.

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>.