ECDSASignature (crypto 4.8.4 API)

java.lang.Object
- org.web3j.crypto.ECDSASignature

public class ECDSASignature
extends java.lang.Object

An ECDSA Signature.

Field Summary

Fields
Modifier and Type Field Description

java.math.BigInteger r

java.math.BigInteger s

Constructor Summary

Constructors
Constructor Description

ECDSASignature(java.math.BigInteger r, java.math.BigInteger s)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`isCanonical()`
`ECDSASignature`	`toCanonicalised()`	Will automatically adjust the S component to be less than or equal to half the curve order, if necessary.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - r
```
public final java.math.BigInteger r
```
  - s
```
public final java.math.BigInteger s
```
- Constructor Detail
  - ECDSASignature
```
public ECDSASignature(java.math.BigInteger r,
                      java.math.BigInteger s)
```
- Method Detail
  - isCanonical
```
public boolean isCanonical()
```
    Returns:
    
    true if the S component is "low", that means it is below Sign.HALF_CURVE_ORDER. See BIP62.
  - toCanonicalised
```
public ECDSASignature toCanonicalised()
```
    Will automatically adjust the S component to be less than or equal to half the curve order, if necessary. This is required because for every signature (r,s) the signature (r, -s (mod N)) is a valid signature of the same message. However, we dislike the ability to modify the bits of a Bitcoin transaction after it's been signed, as that violates various assumed invariants. Thus in future only one of those forms will be considered legal and the other will be banned.
    
    Returns:
    
    the signature in a canonicalised form.