RSA_private_encrypt(3)						      OpenSSL						    RSA_private_encrypt(3)

NAME

       RSA_private_encrypt, RSA_public_decrypt - low level signature operations

SYNOPSIS

	#include <openssl/rsa.h>

	int RSA_private_encrypt(int flen, unsigned char *from,
	   unsigned char *to, RSA *rsa, int padding);

	int RSA_public_decrypt(int flen, unsigned char *from,
	   unsigned char *to, RSA *rsa, int padding);

DESCRIPTION

       These functions handle RSA signatures at a low level.

       RSA_private_encrypt() signs the flen bytes at from (usually a message digest with an algorithm identifier) using the private key rsa and
       stores the signature in to. to must point to RSA_size(rsa) bytes of memory.

       padding denotes one of the following modes:

       RSA_PKCS1_PADDING
	   PKCS #1 v1.5 padding. This function does not handle the algorithmIdentifier specified in PKCS #1. When generating or verifying PKCS #1
	   signatures, RSA_sign(3) and RSA_verify(3) should be used.

       RSA_NO_PADDING
	   Raw RSA signature. This mode should only be used to implement cryptographically sound padding modes in the application code.  Signing
	   user data directly with RSA is insecure.

       RSA_public_decrypt() recovers the message digest from the flen bytes long signature at from using the signer's public key rsa. to must
       point to a memory section large enough to hold the message digest (which is smaller than RSA_size(rsa) - 11). padding is the padding mode
       that was used to sign the data.

RETURN VALUES

       RSA_private_encrypt() returns the size of the signature (i.e., RSA_size(rsa)). RSA_public_decrypt() returns the size of the recovered mes-
       sage digest.

       On error, -1 is returned; the error codes can be obtained by ERR_get_error(3).

SEE ALSO

       ERR_get_error(3), rsa(3), RSA_sign(3), RSA_verify(3)

HISTORY

       The padding argument was added in SSLeay 0.8. RSA_NO_PADDING is available since SSLeay 0.9.0.

0.9.7a								    2002-09-25						    RSA_private_encrypt(3)