> Hmm, that's not a bug. If RSA_NO_PADDING is used the input must
> have the same size as the modulus.
Why? man page (below) does not specify this limitation. RSA
itself does not have this limitation either.
Xinwen Fu
>
> Nils
>
>
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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, and less than RSA_size(rsa) - 41 for
RSA_PKCS1_OAEP_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).
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