Package org.bouncycastle.crypto.signers
Class DSASigner
- java.lang.Object
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- org.bouncycastle.crypto.signers.DSASigner
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Constructor Summary
Constructors Constructor Description DSASigner()
Default configuration, random K values.DSASigner(DSAKCalculator kCalculator)
Configuration with an alternate, possibly deterministic calculator of K.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.math.BigInteger[]
generateSignature(byte[] message)
generate a signature for the given message using the key we were initialised with.java.math.BigInteger
getOrder()
Get the order of the group that the r, s values in signatures belong to.void
init(boolean forSigning, CipherParameters param)
initialise the signer for signature generation or signature verification.protected java.security.SecureRandom
initSecureRandom(boolean needed, java.security.SecureRandom provided)
boolean
verifySignature(byte[] message, java.math.BigInteger r, java.math.BigInteger s)
return true if the value r and s represent a DSA signature for the passed in message for standard DSA the message should be a SHA-1 hash of the real message to be verified.
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Constructor Detail
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DSASigner
public DSASigner()
Default configuration, random K values.
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DSASigner
public DSASigner(DSAKCalculator kCalculator)
Configuration with an alternate, possibly deterministic calculator of K.- Parameters:
kCalculator
- a K value calculator.
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Method Detail
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init
public void init(boolean forSigning, CipherParameters param)
Description copied from interface:DSA
initialise the signer for signature generation or signature verification.
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getOrder
public java.math.BigInteger getOrder()
Description copied from interface:DSAExt
Get the order of the group that the r, s values in signatures belong to.
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generateSignature
public java.math.BigInteger[] generateSignature(byte[] message)
generate a signature for the given message using the key we were initialised with. For conventional DSA the message should be a SHA-1 hash of the message of interest.- Specified by:
generateSignature
in interfaceDSA
- Parameters:
message
- the message that will be verified later.- Returns:
- two big integers representing the r and s values respectively.
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verifySignature
public boolean verifySignature(byte[] message, java.math.BigInteger r, java.math.BigInteger s)
return true if the value r and s represent a DSA signature for the passed in message for standard DSA the message should be a SHA-1 hash of the real message to be verified.- Specified by:
verifySignature
in interfaceDSA
- Parameters:
message
- the message that was supposed to have been signed.r
- the r signature value.s
- the s signature value.
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initSecureRandom
protected java.security.SecureRandom initSecureRandom(boolean needed, java.security.SecureRandom provided)
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