gnu.crypto.sig.rsa
public class EMSA_PKCS1_V1_5 extends Object implements Cloneable
An implementation of the EMSA-PKCS1-V1.5 encoding scheme.
EMSA-PKCS1-V1.5 is parameterised by the choice of hash function Hash and hLen which denotes the length in octets of the hash function output.
References:
Version: $Revision: 1.4 $
Method Summary | |
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Object | clone() |
byte[] | encode(byte[] mHash, int emLen) Frames the hash of a message, along with an ID of the hash function in a DER sequence according to the specifications of EMSA-PKCS1-V1.5 as described in RFC-3447 (see class documentation). |
static EMSA_PKCS1_V1_5 | getInstance(String mdName) Returns an instance of this object given a designated name of a hash function. |
Frames the hash of a message, along with an ID of the hash function in a DER sequence according to the specifications of EMSA-PKCS1-V1.5 as described in RFC-3447 (see class documentation).
Parameters: mHash the byte sequence resulting from applying the message digest
algorithm Hash to the message M. emLen intended length in octets of the encoded message, at least
tLen + 11
, where tLen
is the octet length of the
DER encoding T
of a certain value computed during the
encoding operation.
Returns: encoded message, an octet string of length emLen
.
Throws: IllegalArgumentException if the message is too long, or if the intended encoded message length is too short.
Returns an instance of this object given a designated name of a hash function.
Parameters: mdName the canonical name of a hash function.
Returns: an instance of this object configured for use with the designated options.
Throws: UnsupportedOperationException if the hash function is not implemented or does not have an ID listed in RFC-3447.