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CentOS 7.0 - man page for rsa_sign (centos section 3)

RSA_sign(3)					       OpenSSL						  RSA_sign(3)

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. 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. 1.0.1e 2013-02-11 RSA_sign(3)


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