public byte[] encrypt(byte[] nonce, byte[] message) {
checkLength(nonce, XSALSA20_POLY1305_SECRETBOX_NONCEBYTES);
byte[] msg = Util.prependZeros(ZERO_BYTES, message);
byte[] ct = Util.zeros(msg.length);
isValid(
sodium().crypto_secretbox_xsalsa20poly1305(ct, msg, msg.length, nonce, seed),
"Encryption failed");
return removeZeros(BOXZERO_BYTES, ct);
}
public byte[] decrypt(byte[] nonce, byte[] ciphertext) {
checkLength(nonce, XSALSA20_POLY1305_SECRETBOX_NONCEBYTES);
byte[] ct = Util.prependZeros(BOXZERO_BYTES, ciphertext);
byte[] message = Util.zeros(ct.length);
isValid(
sodium().crypto_secretbox_xsalsa20poly1305_open(message, ct, ct.length, nonce, seed),
"Decryption failed. Ciphertext failed verification");
return removeZeros(ZERO_BYTES, message);
}
public byte[] sign(byte[] message) {
byte[] signature = Util.prependZeros(SIGNATURE_BYTES, message);
LongLongByReference bufferLen = new LongLongByReference(0);
sodium().crypto_sign_ed25519(signature, bufferLen, message, message.length, secretKey);
signature = Util.slice(signature, 0, SIGNATURE_BYTES);
checkLength(signature, SIGNATURE_BYTES);
return signature;
}
public byte[] sign(byte[] message) {
byte[] signature = Util.prependZeros(SIGNATURE_BYTES, message);
int[] bufferLen = new int[1];
sodium().crypto_sign_ed25519(signature, bufferLen, message, message.length, secretKey);
signature = slice(signature, 0, SIGNATURE_BYTES);
return signature;
}