(self, C, t=None, h=None, mgf=None, L=None)
Decrypt ciphertext 'C' using 't' decryption scheme where 't' can be:

        - None: the ciphertext 'C' is directly applied the RSADP decryption
                primitive, as described in PKCS#1 v2.1, i.e. RFC 3447
                Sect 5.1.2. Simply, put the message undergo a modular
                exponentiation using the private key. Additionnal method
                parameters are just ignored.

        - 'pkcs': the ciphertext 'C' is applied RSAES-PKCS1-V1_5-DECRYPT
                decryption scheme as described in section 7.2.2 of RFC 3447.
                In that context, other parameters ('h', 'mgf', 'l') are not
                used.

        - 'oaep': the ciphertext 'C' is applied the RSAES-OAEP-DECRYPT decryption
                scheme, as described in PKCS#1 v2.1, i.e. RFC 3447 Sect
                7.1.2. In that context,

                o 'h' parameter provides the name of the hash method to use.
                  Possible values are "md2", "md4", "md5", "sha1", "tls",
                  "sha224", "sha256", "sha384" and "sha512". if none is provided,
                  sha1 is used by default.

                o 'mgf' is the mask generation function. By default, mgf
                  is derived from the provided hash function using the
                  generic MGF1 (see pkcs_mgf1() for details).

                o 'L' is the optional label to be associated with the
                  message. If not provided, the default value is used, i.e
                  the empty string. No check is done on the input limitation
                  of the hash function regarding the size of 'L' (for
                  instance, 2^61 - 1 for SHA-1). You have been warned.
Decrypt ciphertext 'C' using 't' decryption scheme where 't' can be:
Decrypt ciphertext C using t decryption scheme where t can be :
def decrypt(self, C, t=None, h=None, mgf=None, L=None):
        """
        Decrypt ciphertext 'C' using 't' decryption scheme where 't' can be:

        - None: the ciphertext 'C' is directly applied the RSADP decryption
                primitive, as described in PKCS#1 v2.1, i.e. RFC 3447
                Sect 5.1.2. Simply, put the message undergo a modular
                exponentiation using the private key. Additionnal method
                parameters are just ignored.

        - 'pkcs': the ciphertext 'C' is applied RSAES-PKCS1-V1_5-DECRYPT
                decryption scheme as described in section 7.2.2 of RFC 3447.
                In that context, other parameters ('h', 'mgf', 'l') are not
                used.

        - 'oaep': the ciphertext 'C' is applied the RSAES-OAEP-DECRYPT decryption
                scheme, as described in PKCS#1 v2.1, i.e. RFC 3447 Sect
                7.1.2. In that context,

                o 'h' parameter provides the name of the hash method to use.
                  Possible values are "md2", "md4", "md5", "sha1", "tls",
                  "sha224", "sha256", "sha384" and "sha512". if none is provided,
                  sha1 is used by default.

                o 'mgf' is the mask generation function. By default, mgf
                  is derived from the provided hash function using the
                  generic MGF1 (see pkcs_mgf1() for details).

                o 'L' is the optional label to be associated with the
                  message. If not provided, the default value is used, i.e
                  the empty string. No check is done on the input limitation
                  of the hash function regarding the size of 'L' (for
                  instance, 2^61 - 1 for SHA-1). You have been warned.        
        """
        if t is None:
            C = pkcs_os2ip(C)
            c = self._rsadp(C)
            l = int(math.ceil(math.log(c, 2) / 8.)) # Hack
            return pkcs_i2osp(c, l)

        elif t == "pkcs":
            return self._rsaes_pkcs1_v1_5_decrypt(C)

        elif t == "oaep":
            return self._rsaes_oaep_decrypt(C, h, mgf, L)

        else:
            warning("Key.decrypt(): Unknown decryption type (%s) provided" % t)
            return None
def decrypt ( self , C , t = None , h = None , mgf = None , L = None ) : if t is None : C = pkcs_os2ip ( C ) c = self . _rsadp ( C ) l = int ( math . ceil ( math . log ( c , 2 ) / 8. ) ) # Hack return pkcs_i2osp ( c , l ) elif t == "pkcs" : return self . _rsaes_pkcs1_v1_5_decrypt ( C ) elif t == "oaep" : return self . _rsaes_oaep_decrypt ( C , h , mgf , L ) else : warning ( "Key.decrypt(): Unknown decryption type (%s) provided" % t ) return None