protected byte[] enginesign() throws signatureexception {
byte[] hash = new byte[digest.getdigestsize()];
digest.dofinal(hash, 0);
try {
byte[] sigbytes = new byte[64];
biginteger[] sig = signer.generatesignature(hash);
byte[] r = sig[0].tobytearray();
byte[] s = sig[1].tobytearray();
if (s[0] != 0) {
system.arraycopy(s, 0, sigbytes, 32 - s.length, s.length);
} else {
system.arraycopy(s, 1, sigbytes, 32 - (s.length - 1), s.length - 1);
}
if (r[0] != 0) {
system.arraycopy(r, 0, sigbytes, 64 - r.length, r.length);
} else {
system.arraycopy(r, 1, sigbytes, 64 - (r.length - 1), r.length - 1);
}
return sigbytes;
} catch (exception e) {
throw new signatureexception(e.tostring());
}
}
