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 Title "RSA_sign 3" 
 RSA_sign 3 2025-02-11 3.0.16 OpenSSL
 For nroff, turn off justification. Always turn off hyphenation; it makes
 way too many mistakes in technical documents.
.nh

 NAME
RSA_sign, RSA_verify - RSA signatures

 SYNOPSIS
 Header "SYNOPSIS" .Vb 1
 #include <openssl/rsa.h>
.Ve


The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value,
see openssl_user_macros\|(7):


.Vb 2
 int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
  unsigned char *sigret, unsigned int *siglen, RSA *rsa);
\&
 int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
  unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
.Ve

 DESCRIPTION
 Header "DESCRIPTION" All of the functions described on this page are deprecated.
Applications should instead use EVP_PKEY_sign_init\|(3), EVP_PKEY_sign\|(3),
\fBEVP_PKEY_verify_init\|(3) and EVP_PKEY_verify\|(3).


\fBRSA_sign() signs the message digest m of size m_len using the
private key rsa using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It
stores the signature in sigret and the signature size in siglen.
\fBsigret must point to RSA_size(rsa) bytes of memory.
Note that PKCS #1 adds meta-data, placing limits on the size of the
key that can be used.
See RSA_private_encrypt\|(3) for lower-level
operations.


\fBtype denotes the message digest algorithm that was used to generate
\fBm.
If type is NID_md5_sha1,
an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
and no algorithm identifier) is created.


\fBRSA_verify() verifies that the signature sigbuf of size siglen
matches a given message digest m of size m_len. type denotes
the message digest algorithm that was used to generate the signature.
\fBrsa is the signer's public key.

 "RETURN VALUES"
 Header "RETURN VALUES" \fBRSA_sign() returns 1 on success and 0 for failure.
\fBRSA_verify() returns 1 on successful verification and 0 for failure.


The error codes can be obtained by ERR_get_error\|(3).

 "CONFORMING TO"
 Header "CONFORMING TO" SSL, PKCS #1 v2.0

 "SEE ALSO"
 Header "SEE ALSO" \fBERR_get_error\|(3),
\fBRSA_private_encrypt\|(3),
\fBRSA_public_decrypt\|(3)

 HISTORY
 Header "HISTORY" All of these functions were deprecated in OpenSSL 3.0.

 COPYRIGHT
 Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.


Licensed under the Apache License 2.0 (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
<https://www.openssl.org/source/license.html>.