5 RSA_sign, RSA_verify - RSA signatures
9 #include <openssl/rsa.h>
11 int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
12 unsigned char *sigret, unsigned int *siglen, RSA *rsa);
14 int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
15 unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
19 RSA_sign() signs the message digest B<m> of size B<m_len> using the
20 private key B<rsa> as specified in PKCS #1 v2.0. It stores the
21 signature in B<sigret> and the signature size in B<siglen>. B<sigret>
22 must point to RSA_size(B<rsa>) bytes of memory.
23 Note that PKCS #1 adds meta-data, placing limits on the size of the
25 See L<RSA_private_encrypt(3)|RSA_private_encrypt(3)> for lower-level
28 B<type> denotes the message digest algorithm that was used to generate
29 B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and B<NID_md5>;
30 see L<objects(3)|objects(3)> for details. If B<type> is B<NID_md5_sha1>,
31 an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
32 and no algorithm identifier) is created.
34 RSA_verify() verifies that the signature B<sigbuf> of size B<siglen>
35 matches a given message digest B<m> of size B<m_len>. B<type> denotes
36 the message digest algorithm that was used to generate the signature.
37 B<rsa> is the signer's public key.
41 RSA_sign() returns 1 on success, 0 otherwise. RSA_verify() returns 1
42 on successful verification, 0 otherwise.
44 The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
48 Certain signatures with an improper algorithm identifier are accepted
49 for compatibility with SSLeay 0.4.5 :-)
57 L<ERR_get_error(3)|ERR_get_error(3)>, L<objects(3)|objects(3)>,
58 L<rsa(3)|rsa(3)>, L<RSA_private_encrypt(3)|RSA_private_encrypt(3)>,
59 L<RSA_public_decrypt(3)|RSA_public_decrypt(3)>
63 RSA_sign() and RSA_verify() are available in all versions of SSLeay