public byte[] sign() throws Exception {
byte[] sig = signature.sign();
/*
System.err.print("sign["+sig.length+"] ");
for(int i=0; i<sig.length;i++){
System.err.print(Integer.toHexString(sig[i]&0xff)+":");
}
System.err.println("");
*/
// sig is in ASN.1
// SEQUENCE::={ r INTEGER, s INTEGER }
int len = 0;
int index = 3;
len = sig[index++] & 0xff;
// System.err.println("! len="+len);
byte[] r = new byte[len];
System.arraycopy(sig, index, r, 0, r.length);
index = index + len + 1;
len = sig[index++] & 0xff;
// System.err.println("!! len="+len);
byte[] s = new byte[len];
System.arraycopy(sig, index, s, 0, s.length);
byte[] result = new byte[40];
// result must be 40 bytes, but length of r and s may not be 20 bytes
System.arraycopy(
r,
(r.length > 20) ? 1 : 0,
result,
(r.length > 20) ? 0 : 20 - r.length,
(r.length > 20) ? 20 : r.length);
System.arraycopy(
s,
(s.length > 20) ? 1 : 0,
result,
(s.length > 20) ? 20 : 40 - s.length,
(s.length > 20) ? 20 : s.length);
// System.arraycopy(sig, (sig[3]==20?4:5), result, 0, 20);
// System.arraycopy(sig, sig.length-20, result, 20, 20);
return result;
}
public byte[] sign() throws Exception {
byte[] sig = signature.sign();
return sig;
}