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## gnu.crypto.sig.rsa
Class EMSA_PKCS1_V1_5

    java.lang.Object
      |
      +--gnu.crypto.sig.rsa.EMSA_PKCS1_V1_5

All Implemented Interfaces:
  java.lang.Cloneable

public class EMSA_PKCS1_V1_5
extends java.lang.Object
implements java.lang.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:

1. Public-Key Cryptography Standards (PKCS) #1:
   RSA Cryptography Specifications Version 2.1.
   Jakob Jonsson and Burt Kaliski.

Method Summary
`java.lang.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(java.lang.String mdName)` Returns an instance of this object given a designated name of a hash function.

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getInstance

    public static final EMSA_PKCS1_V1_5 getInstance(java.lang.String mdName)

  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:
    `java.lang.UnsupportedOperationException` - if the hash function is not implemented or does not have an ID listed in RFC-3447.

### clone

    public java.lang.Object clone()

  Overrides:
    `clone` in class `java.lang.Object`

### encode

    public 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).

  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:
    `java.lang.IllegalArgumentException` - if the message is too long, or if the intended encoded message length is too short.

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Copyright © 2001, 2002, 2003, 2004 Free Software Foundation, Inc.