ostore.security
Class RawNativeRSASignature_PKCS1_SHA1

java.lang.Object
  |
  +--ostore.security.RawNativeRSASignature_PKCS1_SHA1

public class RawNativeRSASignature_PKCS1_SHA1

extends Object

A signature class not encumbered by the horrendous design decisions of the Java Signature interface. This class allows the person creating or verifying a signature to extract the result of the secure hash which is calculated along the way, a feat which is not possible under the Signature interface, AFAIK. It also can't inherit from SignatureSpi, since I want all of the engineXXX functions to be public, not protected. Silly Java engineers...

As with NativeRSASignature_PKCS1_SHA1, this class is totally copied from Cryptix. I would _LOVE_ to just extend the class RSASignature_PKCS1_SHA1 and overload only the engineSign and engineVerify methods, but the makePKCS1 function is private, so I have to copy the entire class. I'm talking with the Cryptix folks about having that remedied if possible.

Version:

$Id: RawNativeRSASignature_PKCS1_SHA1.java,v 1.2 2003/11/17 23:52:43 emilong Exp $

Author:

Sean C. Rhea

Constructor Summary

RawNativeRSASignature_PKCS1_SHA1()
Constructor for an Any_RSA_PKCS1Signature.

Method Summary

protected Object	engineGetParameter(String param)
void	engineInitSign(PrivateKey key) Initializes this signature object for signing, using the given private key.
void	engineInitSign(PrivateKey privateKey, SecureRandom random)
void	engineInitVerify(PublicKey key) Initializes this signature object for verification, using the given public key.
protected void	engineSetParameter(AlgorithmParameterSpec params)
protected void	engineSetParameter(String param, Object value)
byte[]	engineSign(SecureHash digest) Terminates the update process and returns the signature bytes of all the data signed so far.
boolean	engineVerify(byte[] signature, SecureHash digest) Terminates the update process and verifies that the passed signature equals that of a generated one based on the updated data so far.
protected byte[]	getAlgorithmEncoding()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RawNativeRSASignature_PKCS1_SHA1

public RawNativeRSASignature_PKCS1_SHA1()

Constructor for an Any_RSA_PKCS1Signature.

Method Detail

getAlgorithmEncoding

protected byte[] getAlgorithmEncoding()

engineInitVerify

public void engineInitVerify(PublicKey key)
                      throws InvalidKeyException

Initializes this signature object for verification, using the given public key.

Parameters:

key - the public key this signature is assumed to have been generated with.

Throws:

InvalidKeyException - If the key class does not implement java.security.interfaces.RSAPrivateKey or if the size of the minimal PKCS#1 frame generated by the engineSign() method will be larger than the public key modulus.

engineInitSign

public void engineInitSign(PrivateKey key)
                    throws InvalidKeyException

Initializes this signature object for signing, using the given private key.

Parameters:

key - the private key to be used to generate signatures.

Throws:

InvalidKeyException - If the key class does not implement java.security.interfaces.RSAPrivateKey or If the size of the minimal PKCS#1 frame generated by the engineSign() method will be larger than the public key modulus.

engineInitSign

public void engineInitSign(PrivateKey privateKey,
                           SecureRandom random)
                    throws InvalidKeyException

InvalidKeyException

engineSign

public byte[] engineSign(SecureHash digest)
                  throws SignatureException

Terminates the update process and returns the signature bytes of all the data signed so far.

NOTES: Sun's documentation talks about the bytes returned being X.509-encoded. For this RSA/PKCS#1 implementation, they conform to PKCS#1 section 10. Practically, the return value will be formed by concatenating a leading NULL byte, a block type BT, a padding block PS, another NULLbyte, and finally a data block D; ie:

     return = 0x00 || BT || PS || 0x00 || D.
 

For signing, PKCS#1 block type 01 encryption-block formatting scheme is employed. The block type BT is a single byte valued 0x01 and the padding block PS is enough 0xFF bytes to make the length of the complete RSA Multi Precision Integer equal to the length of the public modulus. The data block D consists of the MIC -- Message Integrity Check, or message digest value-- and the MIC algorithm ASN.1 encoded identifier. The formal syntax in ASN.1 notation is:

   SEQUENCE {
     digestAlgorithm  AlgorithmIdentifier,
     digest           OCTET STRING
   }

   AlgorithmIdentifier ::= SEQUENCE {
     algorithm        OBJECT IDENTIFIER,
     parameters       ANY DEFINED BY algorithm OPTIONAL
   }
 

Returns:

the signature bytes of the signing operation's result.

Throws:

SignatureException - if the engine is not initialised properly.

engineVerify

public boolean engineVerify(byte[] signature,
                            SecureHash digest)
                     throws SignatureException

Terminates the update process and verifies that the passed signature equals that of a generated one based on the updated data so far.

NOTES: Sun's documentation talks about the bytes received being X.509-encoded. For this RSA/PKCS#1 implementation, the bytes received are assumed to conform to PKCS#1 section 10, or have been generated by a previous invocation of the engineSign method.

Parameters:

signature - the signature bytes to be verified.

Returns:

true if the signature was verified successfully, false otherwise.

Throws:

SignatureException - if the engine is not initialised properly, the received signature data is improperly encoded or of the wrong type, etc.

engineSetParameter

protected void engineSetParameter(String param,
                                  Object value)
                           throws InvalidParameterException

InvalidParameterException

engineSetParameter

protected void engineSetParameter(AlgorithmParameterSpec params)
                           throws InvalidAlgorithmParameterException

InvalidAlgorithmParameterException

engineGetParameter

protected Object engineGetParameter(String param)
                             throws InvalidParameterException

InvalidParameterException