blake2b

A dart implement of blake2b referenced from blacknet and it's source code.

Getting Started

///
/// CASE 1 - hash utf8 string
///

// what we expect
// bip = mean fury common entire zoo cash fragile dilemma retire appear insect park
// hash = A064E3C0E7D606F7EE717718FD23B943328ACD8CC20DE29B4053FC1C9D3888F6
// bytes = -96 100 -29 -64 -25 -42 6 -9 -18 113 119 24 -3 35 -71 67 50 -118 -51 -116 -62 13 -30 -101 64 83 -4 28 -99 56 -120 -10

Int8List expect = Int8List.fromList([-96, 100, -29, -64, -25, -42, 6, -9, -18, 113, 119, 24, -3, 35, -71, 67, 50, -118, -51, -116, -62, 13, -30, -101, 64, 83, -4, 28, -99, 56, -120, -10]);
Uint8List uexpect = Utils.int8list2uint8list(expect);

var bip = "mean fury common entire zoo cash fragile dilemma retire appear insect park";
var upperCaseHash = "A064E3C0E7D606F7EE717718FD23B943328ACD8CC20DE29B4053FC1C9D3888F6";

Int8List message = Int8List(bip.length);
for (int i = 0; i < bip.length; i++) {
    message[i] = bip.codeUnitAt(i);
}

// hash from bytes to bytes
var umessage = Utils.int8list2uint8list(message);

var bytes = Blake2bHash.hash(umessage, 0, umessage.length);
assert(_uint8ListEqual(bytes, uexpect));

// hash from hex string to hex string
var lowerCaseHash = Blake2bHash.hashHexString2HexString(HEX.encode(message));
assert(lowerCaseHash == upperCaseHash.toLowerCase());

// hash from utf8 string to hex string
lowerCaseHash = Blake2bHash.hashUtf8String2HexString(bip);
assert(lowerCaseHash == upperCaseHash.toLowerCase());

///
/// CASE 2 - hash bytes
///

// another test
// hexString = 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000eea2f40ef9c40caffc91d82c3332456039d9562290fe0957bad9ca7bc8e9159900000014d7338a9fc7b42de9c2045635a2bf2ec628f47adec76f8ee6caaa5397025b74e400000000000186a000ae0000000000989680a54407d81a2e4d5c72b8d784a56f88736c64bdf90883c12b6ffff6ec892b2b0c00846d656d6f
// hash = ff773f774a4489c98429d37ba1e8c91ce0ac26af27cd32c1b6ef17843e87eb39
var hexString =
    "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000eea2f40ef9c40caffc91d82c3332456039d9562290fe0957bad9ca7bc8e9159900000014d7338a9fc7b42de9c2045635a2bf2ec628f47adec76f8ee6caaa5397025b74e400000000000186a000ae0000000000989680a54407d81a2e4d5c72b8d784a56f88736c64bdf90883c12b6ffff6ec892b2b0c00846d656d6f";
var messageBytes = Utils.int8list2uint8list(Int8List.fromList(HEX.decode(hexString)));
var hash = Blake2bHash.hash(messageBytes, 64, messageBytes.length - 64);
var expectedHash = Utils.int8list2uint8list(Int8List.fromList(HEX.decode("ff773f774a4489c98429d37ba1e8c91ce0ac26af27cd32c1b6ef17843e87eb39")));
assert(_uint8ListEqual(hash, expectedHash));

///
/// CASE 3 - custom
///

String preSalt = 'preSalt';
int digestSize = 16;
Uint8List bPreSalt = Uint8List.fromList(preSalt.codeUnits);
Uint8List salt = Uint8List(digestSize);
final Blake2b blake2b = Blake2b.blake2b(null, digestSize, null, null);
blake2b.update(bPreSalt, 0, bPreSalt.length);
Uint8List hashBytes = blake2b.digest(salt, 0);
var hashStr = HEX.encode(hashBytes);
print(hashStr);

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