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RSA_PUBLIC_ENCRYPT(3)		    OpenSSL		 RSA_PUBLIC_ENCRYPT(3)

NAME
       RSA_public_encrypt, RSA_private_decrypt - RSA public key	cryptography

SYNOPSIS
	#include <openssl/rsa.h>

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

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

DESCRIPTION
       RSA_public_encrypt() encrypts the flen bytes at from (usually a session
       key) using the public key rsa and stores	the ciphertext 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 currently	is the most widely used	mode.

       RSA_PKCS1_OAEP_PADDING
	   EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1	and an empty
	   encoding parameter. This mode is recommended	for all	new
	   applications.

       RSA_SSLV23_PADDING
	   PKCS	#1 v1.5	padding	with an	SSL-specific modification that denotes
	   that	the server is SSL3 capable.

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

       flen must be less than RSA_size(rsa) - 11 for the PKCS #1 v1.5 based
       padding modes, less than	RSA_size(rsa) -	41 for RSA_PKCS1_OAEP_PADDING
       and exactly RSA_size(rsa) for RSA_NO_PADDING.  The random number
       generator must be seeded	prior to calling RSA_public_encrypt().

       RSA_private_decrypt() decrypts the flen bytes at	from using the private
       key rsa and stores the plaintext	in to. to must point to	a memory
       section large enough to hold the	decrypted data (which is smaller than
       RSA_size(rsa)). padding is the padding mode that	was used to encrypt
       the data.

RETURN VALUES
       RSA_public_encrypt() returns the	size of	the encrypted data (i.e.,
       RSA_size(rsa)). RSA_private_decrypt() returns the size of the recovered
       plaintext.

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

WARNING
       Decryption failures in the RSA_PKCS1_PADDING mode leak information
       which can potentially be	used to	mount a	Bleichenbacher padding oracle
       attack. This is an inherent weakness in the PKCS	#1 v1.5	padding
       design. Prefer RSA_PKCS1_OAEP_PADDING.

CONFORMING TO
       SSL, PKCS #1 v2.0

SEE ALSO
       ERR_get_error(3), RAND_bytes(3),	RSA_size(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_PUBLIC_ENCRYPT(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | WARNING | CONFORMING TO | SEE ALSO | COPYRIGHT

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