Class DSASigner
- java.lang.Object
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- org.gudy.bouncycastle.crypto.signers.DSASigner
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Field Summary
Fields Modifier and Type Field Description (package private) DSAKeyParameters
key
(package private) java.security.SecureRandom
random
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Constructor Summary
Constructors Constructor Description DSASigner()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private java.math.BigInteger
calculateE(java.math.BigInteger n, byte[] message)
java.math.BigInteger[]
generateSignature(byte[] message)
generate a signature for the given message using the key we were initialised with.void
init(boolean forSigning, CipherParameters param)
initialise the signer for signature generation or signature verification.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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Field Detail
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key
DSAKeyParameters key
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random
java.security.SecureRandom random
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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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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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calculateE
private java.math.BigInteger calculateE(java.math.BigInteger n, byte[] message)
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