Name

RSA_sign, RSA_verify — RSA signatures

Library

libcrypto.lib

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);

Detailed 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_md5; see objects() 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().

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(), objects(), rsa(), RSA_private_encrypt(), RSA_public_decrypt()

History

RSA_sign() and RSA_verify() are available in all versions of SSLeay and OpenSSL.

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