| java.lang.Object
 java.security.Signature
sun.security.provider.DSA
| DSA | | final public class DSA extends Signature (Code) | | The Digital Signature Standard (using the Digital Signature
Algorithm), as described in fips186 of the National Instute of
Standards and Technology (NIST), using fips180-1 (SHA-1).
author:
Benjamin Renaud
version:
1.88, 02/02/00
See Also: DSAPublicKey
See Also: DSAPrivateKey |
| Constructor Summary | |
| public | DSA()
Construct a blank DSA object. |
| Method Summary | |
| static int[] | SHA_7(int[] m1, int[] h)
Computes set 1 thru 7 of SHA-1 on m1. | | protected Object | engineGetParameter(String key)
Return the value of the requested parameter. | | protected void | engineInitSign(PrivateKey privateKey)
Initialize the DSA object with a DSA private key. | | protected void | engineInitVerify(PublicKey publicKey)
Initialize the DSA object with a DSA public key. | | protected void | engineSetParameter(String key, Object param)
This implementation recognizes the following parameter:
- Kseed
- a byte array.
| | protected byte[] | engineSign()
Sign all the data thus far updated. | | protected void | engineUpdate(byte b)
Update a byte to be signed or verified. | | protected void | engineUpdate(byte[] data, int off, int len)
Update an array of bytes to be signed or verified. | | protected boolean | engineVerify(byte[] signature)
Verify all the data thus far updated. | | protected boolean | engineVerify(byte[] signature, int offset, int length)
Verify all the data thus far updated. | | BigInteger | generateK(BigInteger q)
| | BigInteger | generateK(int[] seed, BigInteger q)
Compute k for a DSA signature.
Parameters:
seed - the seed for generating k. | | BigInteger | generateR(BigInteger p, BigInteger q, BigInteger g, BigInteger k)
| | BigInteger | generateS(BigInteger x, BigInteger q, BigInteger r, BigInteger k)
| | BigInteger | generateV(BigInteger y, BigInteger p, BigInteger q, BigInteger g, BigInteger w, BigInteger r)
| | BigInteger | generateW(BigInteger p, BigInteger q, BigInteger g, BigInteger s)
| | public String | toString()
Return a human readable rendition of the engine. |
| DSA | | public DSA() throws NoSuchAlgorithmException(Code) | | Construct a blank DSA object. It can generate keys, but must be
initialized before being usable for signing or verifying.
|
| SHA_7 | | static int[] SHA_7(int[] m1, int[] h)(Code) | | Computes set 1 thru 7 of SHA-1 on m1.
|
| engineGetParameter | | protected Object engineGetParameter(String key)(Code) | | Return the value of the requested parameter. Recognized
parameters are:
- Kseed
- a byte array.
the value of the requested parameter.
See Also: java.security.SignatureEngine
See Also: |
| engineInitVerify | | protected void engineInitVerify(PublicKey publicKey) throws InvalidKeyException(Code) | | Initialize the DSA object with a DSA public key.
Parameters:
publicKey - the DSA public key.
exception:
InvalidKeyException - if the key is not a valid DSA publickey. |
| engineSetParameter | | protected void engineSetParameter(String key, Object param)(Code) | | This implementation recognizes the following parameter:
- Kseed
- a byte array.
|
| engineSign | | protected byte[] engineSign() throws SignatureException(Code) | | Sign all the data thus far updated. The signature is formatted
according to the Canonical Encoding Rules, returned as a DER
sequence of Integer, r and s.
a signature block formatted according to the CanonicalEncoding Rules.
exception:
SignatureException - if the signature object was notproperly initialized, or if another exception occurs.
See Also: sun.security.DSA.engineUpdate
See Also: sun.security.DSA.engineVerify |
| engineUpdate | | protected void engineUpdate(byte b)(Code) | | Update a byte to be signed or verified.
Parameters:
b - the byte to updated. |
| engineUpdate | | protected void engineUpdate(byte[] data, int off, int len)(Code) | | Update an array of bytes to be signed or verified.
Parameters:
data - the bytes to be updated. |
| engineVerify | | protected boolean engineVerify(byte[] signature) throws SignatureException(Code) | | Verify all the data thus far updated.
Parameters:
signature - the alledged signature, encoded using theCanonical Encoding Rules, as a sequence of integers, r and s.
exception:
SignatureException - if the signature object was notproperly initialized, or if another exception occurs.
See Also: sun.security.DSA.engineUpdate
See Also: sun.security.DSA.engineSign
See Also: |
| engineVerify | | protected boolean engineVerify(byte[] signature, int offset, int length) throws SignatureException(Code) | | Verify all the data thus far updated.
Parameters:
signature - the alledged signature, encoded using theCanonical Encoding Rules, as a sequence of integers, r and s.
Parameters:
offset - the offset to start from in the array of bytes.
Parameters:
length - the number of bytes to use, starting at offset.
exception:
SignatureException - if the signature object was notproperly initialized, or if another exception occurs.
See Also: sun.security.DSA.engineUpdate
See Also: sun.security.DSA.engineSign
See Also: |
| generateK | | BigInteger generateK(int[] seed, BigInteger q)(Code) | | Compute k for a DSA signature.
Parameters:
seed - the seed for generating k. This seed should besecure. This is what is refered to as the KSEED in the DSAspecification.
Parameters:
g - the g parameter from the DSA key pair. |
| toString | | public String toString()(Code) | | Return a human readable rendition of the engine.
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