1RSA_sign(3)                         OpenSSL                        RSA_sign(3)
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NAME

6       RSA_sign, RSA_verify - RSA signatures
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SYNOPSIS

9        #include <openssl/rsa.h>
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11        int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
12           unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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14        int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
15           unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
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DESCRIPTION

18       RSA_sign() signs the message digest m of size m_len using the private
19       key rsa as specified in PKCS #1 v2.0. It stores the signature in sigret
20       and the signature size in siglen. sigret must point to RSA_size(rsa)
21       bytes of memory.
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23       type denotes the message digest algorithm that was used to generate m.
24       It usually is one of NID_sha1, NID_ripemd160 and NID_md5; see
25       objects(3) for details. If type is NID_md5_sha1, an SSL signature (MD5
26       and SHA1 message digests with PKCS #1 padding and no algorithm
27       identifier) is created.
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29       RSA_verify() verifies that the signature sigbuf of size siglen matches
30       a given message digest m of size m_len. type denotes the message digest
31       algorithm that was used to generate the signature.  rsa is the signer's
32       public key.
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RETURN VALUES

35       RSA_sign() returns 1 on success, 0 otherwise.  RSA_verify() returns 1
36       on successful verification, 0 otherwise.
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38       The error codes can be obtained by ERR_get_error(3).
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BUGS

41       Certain signatures with an improper algorithm identifier are accepted
42       for compatibility with SSLeay 0.4.5 :-)
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CONFORMING TO

45       SSL, PKCS #1 v2.0
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SEE ALSO

48       ERR_get_error(3), objects(3), rsa(3), RSA_private_encrypt(3),
49       RSA_public_decrypt(3)
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HISTORY

52       RSA_sign() and RSA_verify() are available in all versions of SSLeay and
53       OpenSSL.
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571.0.0e                            2005-04-21                       RSA_sign(3)
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