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RSA_public_encrypt() encrypts the B<flen> bytes at B<from> (usually a

session key) using the public key B<rsa> and stores the ciphertext in

B<to>. B<to> must point to B<RSA_size(rsa)> bytes of memory.

B<to>. B<to> must point to RSA_size(B<rsa>) bytes of memory.

B<padding> denotes one of the following modes:

=back

B<flen> must be less than RSA_size(rsa) - 11 for the PKCS #1 v1.5

based padding modes, and less than RSA_size(rsa) - 21 for

B<flen> must be less than RSA_size(B<rsa>) - 11 for the PKCS #1 v1.5

based padding modes, and less than RSA_size(B<rsa>) - 21 for

RSA_PKCS1_OAEP_PADDING. The random number generator must be seeded

prior to calling RSA_public_encrypt().

RSA_private_decrypt() decrypts the B<flen> bytes at B<from> using the

private key B<rsa> and stores the plaintext in B<to>. B<to> must point

to a memory section large enough to hold the decrypted data (which is

smaller than B<RSA_size(rsa)>). B<padding> is the padding mode that

smaller than RSA_size(B<rsa>)). B<padding> is the padding mode that

was used to encrypt the data.

=head1 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

RSA_size(B<rsa>)). RSA_private_decrypt() returns the size of the

recovered plaintext.

On error, -1 is returned; the error codes can be

RSA_sign() signs the message digest B<m> of size B<m_len> using the

private key B<rsa> as specified in PKCS #1 v2.0. It stores the

signature in B<sigret> and the signature size in B<siglen>. B<sigret>

must point to B<RSA_size(rsa)> bytes of memory.

must point to RSA_size(B<rsa>) bytes of memory.

B<type> denotes the message digest algorithm that was used to generate

B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and B<NID_md5>;