RSA_sign
Section: OpenSSL (3)
Updated: 2017-05-25
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NAME
RSA_sign, RSA_verify - RSA signatures
SYNOPSIS
#include <openssl/rsa.h>
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);
DESCRIPTION
RSA_sign() signs the message digest
m of size
m_len using the
private key
rsa as specified in
PKCS #1 v2.0. It stores the
signature in
sigret and the signature size in
siglen.
sigret
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.
type denotes the message digest algorithm that was used to generate
m. It usually is one of NID_sha1, NID_ripemd160 and NID_md5;
see objects(3) for details. If type is NID_md5_sha1,
an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
and no algorithm identifier) is created.
RSA_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.
rsa is the signer's public key.
RETURN VALUES
RSA_sign() returns 1 on success, 0 otherwise.
RSA_verify() returns 1
on successful verification, 0 otherwise.
The error codes can be obtained by ERR_get_error(3).
BUGS
Certain signatures with an improper algorithm identifier are accepted
for compatibility with SSLeay 0.4.5 :-)
CONFORMING TO
SSL, PKCS #1 v2.0
SEE ALSO
ERR_get_error(3),
objects(3),
rsa(3),
RSA_private_encrypt(3),
RSA_public_decrypt(3)
HISTORY
RSA_sign() and
RSA_verify() are available in all versions of SSLeay
and OpenSSL.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- BUGS
-
- CONFORMING TO
-
- SEE ALSO
-
- HISTORY
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