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Class cryptix.provider.rsa.Any_RSA_PKCS1Signature
java.lang.Object
|
+----java.security.Signature
|
+----cryptix.provider.rsa.Any_RSA_PKCS1Signature
- public abstract class Any_RSA_PKCS1Signature
- extends Signature
An abstract class to digest a message and sign/verify the resulting
hash value, using any JCA MessageDigest algorithm with the RSA
digital signature scheme, and the formatting and padding conventions
defined by PKCS#1. These conventions are compatible with PEM (RFC-1423).
References:
- Bruce Schneier,
"Section 19.3 RSA,"
Applied Cryptography, 2nd edition,
John Wiley & Sons, 1996.
- PKCS#1 [need reference]
- RFC-1423 [need reference]
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.4 $
- Author:
- Raif S. Naffah, David Hopwood
-
Any_RSA_PKCS1Signature(String)
- Constructor for an Any_RSA_PKCS1Signature.
-
engineGetParameter(String)
-
-
engineInitSign(PrivateKey)
- SPI: Initializes this signature object for signing, using the
given private key.
-
engineInitVerify(PublicKey)
- SPI: Initializes this signature object for verification, using
the given public key.
-
engineSetParameter(String, Object)
-
-
engineSign()
- Terminates the update process and returns the signature bytes of
all the data signed so far.
-
engineUpdate(byte)
- Updates the data to be signed or verified, using one byte.
-
engineUpdate(byte[], int, int)
- Updates the data to be signed or verified, using the specified
sub-array of bytes, starting at the specified offset.
-
engineVerify(byte[])
- Terminates the update process and verifies that the passed signature
equals that of a generated one based on the updated data so far.
-
getAlgorithmEncoding()
- Returns the ASN.1 bytes of the AlgorithmIdentifier token described
in
engineSign()
method above.
Any_RSA_PKCS1Signature
protected Any_RSA_PKCS1Signature(String mdAlgorithm)
- Constructor for an Any_RSA_PKCS1Signature.
- Parameters:
- mdAlgorithm - the standard JCA algorithm name of the message
digest to be used.
engineInitSign
protected void engineInitSign(PrivateKey key) throws InvalidKeyException
- SPI: 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.
- Overrides:
- engineInitSign in class Signature
engineInitVerify
protected void engineInitVerify(PublicKey key) throws InvalidKeyException
- SPI: 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.RSAPublicKey.
- Overrides:
- engineInitVerify in class Signature
engineUpdate
protected void engineUpdate(byte b) throws SignatureException
- Updates the data to be signed or verified, using one byte.
- Parameters:
- b - the byte to use for the update process.
- Throws: SignatureException
- if the engine is not initialised properly.
- Overrides:
- engineUpdate in class Signature
engineUpdate
protected void engineUpdate(byte in[],
int offset,
int length) throws SignatureException
- Updates the data to be signed or verified, using the specified
sub-array of bytes, starting at the specified offset.
- Parameters:
- in - the array of bytes.
- offset - the offset to start from in in.
- length - the number of bytes to use, starting at offset.
- Throws: SignatureException
- if the engine is not initialised properly.
- Overrides:
- engineUpdate in class Signature
engineSign
protected byte[] engineSign() 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.
- Overrides:
- engineSign in class Signature
engineVerify
protected boolean engineVerify(byte signature[]) 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.
- Overrides:
- engineVerify in class Signature
engineSetParameter
protected void engineSetParameter(String param,
Object value) throws InvalidParameterException
- Overrides:
- engineSetParameter in class Signature
engineGetParameter
protected Object engineGetParameter(String param) throws InvalidParameterException
- Overrides:
- engineGetParameter in class Signature
getAlgorithmEncoding
protected abstract byte[] getAlgorithmEncoding()
- Returns the ASN.1 bytes of the AlgorithmIdentifier token described
in
engineSign()
method above.
- Returns:
- the AlgorithmIdentifier bytes.
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