web3dart/crypto library

Exports low-level cryptographic operations needed to sign Ethereum transactions.

Classes

MsgSignature

Signatures used to sign Ethereum transactions and messages.

Properties

keccakDigest → KeccakDigest

final

Functions

bytesToHex(List<int> bytes, {bool include0x = false, int? forcePadLength, bool padToEvenLength = false}) → String

Converts the bytes given as a list of integers into a hexadecimal representation.

bytesToInt(List<int> bytes) → BigInt

Converts the bytes from that list (big endian) to a (potentially signed) BigInt.

bytesToUnsignedInt(Uint8List bytes) → BigInt

compressPublicKey(Uint8List compressedPubKey) → Uint8List

Given a byte array computes its compressed version and returns it as a byte array, including the leading 02 or 03

decompressPublicKey(Uint8List compressedPubKey) → Uint8List

Given a byte array computes its expanded version and returns it as a byte array, including the leading 04

ecRecover(Uint8List messageHash, MsgSignature signatureData) → Uint8List

Given an arbitrary message hash and an Ethereum message signature encoded in bytes, returns the public key that was used to sign it. https://github.com/web3j/web3j/blob/c0b7b9c2769a466215d416696021aa75127c2ff1/crypto/src/main/java/org/web3j/crypto/Sign.java#L241

generateNewPrivateKey(Random random) → BigInt

Generates a new private key using the random instance provided. Please make sure you're using a cryptographically secure generator.

hexToBytes(String hexStr) → Uint8List

Converts the hexadecimal string, which can be prefixed with 0x, to a byte sequence.

hexToDartInt(String hex) → int

Converts the hexadecimal input and creates an int.

hexToInt(String hex) → BigInt

Takes the hexadecimal input and creates a BigInt.

intToBytes(BigInt number) → Uint8List

isValidSignature(Uint8List messageHash, MsgSignature signatureData, Uint8List publicKey) → bool

Given an arbitrary message hash, an Ethereum message signature encoded in bytes and a public key encoded in bytes, confirms whether that public key was used to sign the message or not.

keccak256(Uint8List input) → Uint8List

keccakAscii(String input) → Uint8List

keccakUtf8(String input) → Uint8List

privateKeyBytesToPublic(Uint8List privateKey) → Uint8List

Generates a public key for the given private key using the ecdsa curve which Ethereum uses.

privateKeyToPublic(BigInt privateKey) → Uint8List

Generates a public key for the given private key using the ecdsa curve which Ethereum uses.

publicKeyToAddress(Uint8List publicKey) → Uint8List

Constructs the Ethereum address associated with the given public key by taking the lower 160 bits of the key's sha3 hash.

sign(Uint8List messageHash, Uint8List privateKey) → MsgSignature

Signs the hashed data in messageHash using the given private key.

strip0x(String hex) → String

If present, removes the 0x from the start of a hex-string.

unsignedIntToBytes(BigInt number) → Uint8List