public ECDSACryptoSignature build() {
byte[] bytes = new byte[digest.getDigestSize()];
digest.doFinal(bytes, 0);
digest.reset();
log(meta, bytes);
ECDSACryptoSignature sig = CryptoFactory.INSTANCE.sign(meta, sKey, bytes);
for (String ref : references) {
sig.addDataReference(ref);
}
references.clear();
log(meta, count);
count = 0;
return sig;
}
public ECDSASignatureBuilder update(String label, byte[] bytes) {
if (bytes == null) throw new RuntimeException("Input is null: " + label);
references.add(label);
count += bytes.length;
log(label, bytes);
digest.update(bytes, 0, bytes.length);
return this;
}
public ECDSASignatureBuilder update(String label, String input) {
if (input == null) throw new RuntimeException("Input is null: " + label);
references.add(label);
byte[] bytes = input.getBytes(Charset.forName("UTF-8"));
count += bytes.length;
log(label, bytes);
digest.update(bytes, 0, bytes.length);
return this;
}
/**
* By default this constructor updates SignedBy and SignedWith, so even with no other calls to
* update you get a meaningful signature out of build()
*
* @param signedBy
* @param sKey
*/
public ECDSASignatureBuilder(String signedBy, ECKeyContents sKey) {
super();
this.sKey = sKey;
this.digest = new SHA1Digest();
this.references = new ArrayList<String>();
this.signedBy = signedBy;
if (signedBy == null) throw new RuntimeException("Registration Handle cannot be null");
meta =
new SignatureMetadata(
SignatureAlgorithm.ECDSA, digest.getAlgorithmName(), sKey.getHandle(), signedBy);
update(meta.getHandle() + ":SignedBy", signedBy);
update(".SignedWith", sKey.getHandle());
}