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-=pod
-
-=head1 NAME
-
-RSA_private_encrypt, RSA_public_decrypt - low level signature operations
-
-=head1 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);
-
-=head1 DESCRIPTION
-
-These functions handle RSA signatures at a low level.
-
-RSA_private_encrypt() signs the B<flen> bytes at B<from> (usually a
-message digest with an algorithm identifier) using the private key
-B<rsa> and stores the signature in B<to>. B<to> must point to
-B<RSA_size(rsa)> bytes of memory.
-
-B<padding> denotes one of the following modes:
-
-=over 4
-
-=item RSA_PKCS1_PADDING
-
-PKCS #1 v1.5 padding. This function does not handle the
-B<algorithmIdentifier> specified in PKCS #1. When generating or
-verifying PKCS #1 signatures, L<RSA_sign(3)|RSA_sign(3)> and L<RSA_verify(3)|RSA_verify(3)> should be
-used.
-
-=item RSA_NO_PADDING
-
-Raw RSA signature. This mode should I<only> be used to implement
-cryptographically sound padding modes in the application code.
-Signing user data directly with RSA is insecure.
-
-=back
-
-RSA_public_decrypt() recovers the message digest from the B<flen>
-bytes long signature at B<from> using the signer's public key
-B<rsa>. B<to> must point to a memory section large enough to hold the
-message digest (which is smaller than B<RSA_size(rsa) -
-11>). B<padding> is the padding mode that was used to sign the data.
-
-=head1 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 L<ERR_get_error(3)|ERR_get_error(3)>.
-
-=head1 SEE ALSO
-
-L<ERR_get_error(3)|ERR_get_error(3)>, L<rsa(3)|rsa(3)>,
-L<RSA_sign(3)|RSA_sign(3)>, L<RSA_verify(3)|RSA_verify(3)>
-
-=head1 HISTORY
-
-The B<padding> argument was added in SSLeay 0.8. RSA_NO_PADDING is
-available since SSLeay 0.9.0.
-
-=cut