RSA_sign man page on DigitalUNIX

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RSA_sign(3)							   RSA_sign(3)

NAME
       RSA_sign, RSA_verify - RSA signatures

SYNOPSIS
       #include <openssl/rsa.h>

       int RSA_sign(
	       int  type,  unsigned char *m, unsigned int m_len, unsigned char
       *sigret, unsigned int *siglen, RSA *rsa ); int RSA_verify(
	       int type, unsigned char *m, unsigned int m_len,	unsigned  char
       *sigbuf, unsigned int siglen, RSA *rsa );

DESCRIPTION
       The  RSA_sign() function signs the message digest m of size m_len using
       the private key rsa as specified in PKCS #1 v2.0. It stores the	signa‐
       ture  in sigret and the signature size in siglen. The sigret must point
       to RSA_size(rsa) bytes of memory.

       The 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 identi‐
       fier) is created.

       The RSA_verify() function verifies that the signature  sigbuf  of  size
       siglen matches a given message digest m of size m_len. The type denotes
       the message digest algorithm that was used to generate  the  signature.
       The rsa is the signer's public key.

       These functions conform to SSL, PKCS #1 v2.0.

RESTRICTIONS
       Certain	signatures  with an improper algorithm identifier are accepted
       for compatibility with SSLeay 0.4.5.

RETURN VALUES
       The RSA_sign()  function	 returns  1  on	 success,  0  otherwise.   The
       RSA_verify()  function  returns	1 on successful verification, 0 other‐
       wise.

       The error codes can be obtained by using the ERR_get_error() function.

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

SEE ALSO
       Functions: err(3), objects(3), rsa(3), RSA_private_encrypt(3), RSA_pub‐
       lic_decrypt(3)

								   RSA_sign(3)
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