io.neow3j.devpack.Crypto Maven / Gradle / Ivy
package io.neow3j.devpack;
import io.neow3j.constants.InteropServiceCode;
import io.neow3j.devpack.annotations.Syscall;
import io.neow3j.devpack.contracts.CryptoLib;
/**
* Offers cryptographic functions for use in smart contracts.
*/
public class Crypto {
/**
* Checks if the {@code signature} is valid given that {@code publicKey} is the signer. The
* message that corresponds to the signature is the container that started the current
* execution of the smart contract, i.e., usually the transaction.
*
* The ECC curve secp256r1 is assumed.
*
* @param publicKey The public key.
* @param signature The signature.
* @return True if the signature is valid. False otherwise.
*/
@Syscall(InteropServiceCode.NEO_CRYPTO_CHECKSIG)
public static native boolean checkSig(ECPoint publicKey, String signature);
/**
* Checks if the {@code signatures} are valid given that {@code publicKeys} are the signers.
* The message that corresponds to the signatures is the container that started the current
* execution of the smart contract, i.e., usually the transaction.
*
* The ECC curve secp256r1 is assumed.
*
* @param signatures The signatures.
* @param publicKeys The public keys.
* @return True if the signatures are valid. False otherwise.
*/
@Syscall(InteropServiceCode.NEO_CRYPTO_CHECKMULTISIG)
public static native boolean checkMultisig(ECPoint[] publicKeys, String[] signatures);
/**
* Applies SHA-256 twice to the given value.
*
* @param value The value to hash.
* @return the 256 bit long hash.
*/
public static Hash256 hash256(String value) {
return new Hash256(CryptoLib.sha256(CryptoLib.sha256(value)));
}
/**
* First applies SHA-256 then RIPEMD-160 to the given value.
*
* @param value The value to hash.
* @return the 160 bit long hash.
*/
public static Hash160 hash160(String value) {
return new Hash160(CryptoLib.ripemd160(CryptoLib.sha256(value)));
}
}