Class BaseX931Signer
- java.lang.Object
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- org.bouncycastle.crypto.internal.signers.BaseX931Signer
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- All Implemented Interfaces:
Signer
public class BaseX931Signer extends java.lang.Object implements Signer
X9.31-1998 - signing using a hash.The message digest hash, H, is encapsulated to form a byte string as follows
EB = 06 || PS || 0xBA || H || TRAILER
where PS is a string of bytes all of value 0xBB of length such that |EB|=|n|, and TRAILER is the ISO/IEC 10118 part number? for the digest. The byte string, EB, is converted to an integer value, the message representative, f.
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Field Summary
Fields Modifier and Type Field Description static int
TRAILER_IMPLICIT
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Constructor Summary
Constructors Constructor Description BaseX931Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)
Generate a signer with either implicit or explicit trailers for X9.31
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description byte[]
generateSignature()
generate a signature for the loaded message using the key we were initialised with.void
init(boolean forSigning, CipherParameters param)
Initialise the signer for signing or verification.void
reset()
reset the internal statevoid
update(byte b)
update the internal digest with the byte bvoid
update(byte[] in, int off, int len)
update the internal digest with the byte array inboolean
verifySignature(byte[] signature)
return true if the signature represents a X9.31 signature for the passed in message.
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Field Detail
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TRAILER_IMPLICIT
public static final int TRAILER_IMPLICIT
- See Also:
- Constant Field Values
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Constructor Detail
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BaseX931Signer
public BaseX931Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)
Generate a signer with either implicit or explicit trailers for X9.31- Parameters:
cipher
- base cipher to use for signature creation/verificationdigest
- digest to use.implicit
- whether or not the trailer is implicit or gives the hash.
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Method Detail
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init
public void init(boolean forSigning, CipherParameters param)
Description copied from interface:Signer
Initialise the signer for signing or verification.
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update
public void update(byte b)
update the internal digest with the byte b
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update
public void update(byte[] in, int off, int len)
update the internal digest with the byte array in
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generateSignature
public byte[] generateSignature() throws CryptoException
generate a signature for the loaded message using the key we were initialised with.- Specified by:
generateSignature
in interfaceSigner
- Throws:
CryptoException
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verifySignature
public boolean verifySignature(byte[] signature)
return true if the signature represents a X9.31 signature for the passed in message.- Specified by:
verifySignature
in interfaceSigner
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