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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
       message digest.

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

SEE ALSO
       ERR_get_error(3), RSA_sign(3), RSA_verify(3)

COPYRIGHT
       Copyright 2000-2016 The OpenSSL Project Authors.	All Rights Reserved.

       Licensed	under the OpenSSL license (the "License").  You	may not	use
       this file except	in compliance with the License.	 You can obtain	a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

1.1.1a				  2018-11-20		RSA_PRIVATE_ENCRYPT(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | COPYRIGHT

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