io.neow3j.constants.NeoConstants Maven / Gradle / Ivy
package io.neow3j.constants;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.ec.CustomNamedCurves;
import org.bouncycastle.crypto.params.ECDomainParameters;
import java.math.BigDecimal;
import java.math.BigInteger;
public class NeoConstants {
//region Cryptography
public static final X9ECParameters CURVE_PARAMS = CustomNamedCurves.getByName("secp256r1");
public static final ECDomainParameters CURVE = new ECDomainParameters(
CURVE_PARAMS.getCurve(), CURVE_PARAMS.getG(), CURVE_PARAMS.getN(), CURVE_PARAMS.getH());
public static final BigInteger HALF_CURVE_ORDER = CURVE_PARAMS.getN().shiftRight(1);
//endregion
//region Data Types
public static final int FIXED8_SCALE = 8;
public static final BigDecimal FIXED8_DECIMALS = BigDecimal.TEN.pow(FIXED8_SCALE);
/**
* Length of a Fixed8 byte array.
*/
public static final int FIXED8_LENGTH = 8;
//endregion
//region Accounts, Addresses, Keys
/**
* The maximum number of public keys that can take part in a multi-signature address. Taken from
* Neo.SmartContract.Contract.CreateMultiSigRedeemScript(...) in the C# neo repo at
* https://github.com/neo-project/neo.
*/
public static final int MAX_PUBLIC_KEYS_PER_MULTISIG_ACCOUNT = 1024;
/**
* The byte size of a script hash.
*/
public static final int SCRIPTHASH_SIZE = 20;
/**
* Size of a private key in bytes
*/
public static final int PRIVATE_KEY_SIZE = 32;
/**
* Size of a public key in bytes
*/
public static final int PUBLIC_KEY_SIZE = 33;
/**
* Number of characters in a NEO address String.
*/
public static final int ADDRESS_SIZE = 34;
/**
* Size of a signature in bytes.
*/
public static final int SIGNATURE_SIZE = 64;
/**
* Size of an invocation (signature) script in bytes.
*
* 1 (PUSHDATA OpCode) + 1 (byte for data length) + 64 (signature) = 66
*/
public static final int INVOCATION_SCRIPT_SIZE = 66;
/**
* Size of a serialized invocation (signature) script in bytes.
*
* 1 (byte for VarInt) + 1 (PUSHDATA OpCode) + 1 (byte for data length) + 64 (signature) = 67
*/
public static final int SERIALIZED_INVOCATION_SCRIPT_SIZE = 67;
/**
* Size of a verification script in bytes.
*
* 1 (PUSHDATA OpCode) + 1 (byte for data length) + 33 (public key) + 1 (PUSHNULL OpCode) + 1
* (SYSCALL Opcode) + 4 (InteropServiceCode) = 41
*/
public static final int VERIFICATION_SCRIPT_SIZE = 41;
//endregion
//region Fees
/**
* The basic GAS fee to be paid when deploying or migrating a contract.
*/
public static final int CONTRACT_DEPLOY_BASIC_FEE = 100;
/**
* The additional GAS fee to be paid when deploying a contract that needs storage.
*/
public static final int CONTRACT_DEPLOY_STORAGE_FEE = 400;
/**
* The additional GAS fee to be paid when deploying a contract that needs dynamic invokes.
*/
public static final int CONTRACT_DEPLOY_DYNAMIC_INVOKE_FEE = 500;
/**
* The network fee per byte of a transaction. Amount is in GAS.
*/
public static final long GAS_PER_BYTE = 1000;
//endregion
//region Transactions & Contracts
/**
* The current version used for Neo transaction.
*/
public static final byte CURRENT_TX_VERSION = 0;
/**
* The maximum size of a transaction in bytes.
*/
public static final int MAX_TRANSACTION_SIZE = 102400;
/**
* The maximum number of attributes that a transaction can have.
*/
public static final int MAX_TRANSACTION_ATTRIBUTES = 16;
/**
* The maximum number of contracts or groups a signer scope can contain.
*/
public static final int MAX_SIGNER_SUBITEMS = 16;
/**
* The maximum value for the 'validUntilBlock' transaction property.
*/
public static final int MAX_VALID_UNTIL_BLOCK_INCREMENT = 2102400;
/**
* Max byte length for a valid contract manifest.
*/
public static final int MAX_MANIFEST_SIZE = 4096;
//endregion
}