yann300
2 years ago
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94104df6d7
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import { keccak224, keccak384, keccak256 as k256, keccak512 } from 'ethereum-cryptography/keccak' |
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const createHash = require('create-hash') |
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import { encode, Input } from 'rlp' |
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import { toBuffer, setLengthLeft, isHexString } from '@ethereumjs/util' |
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|
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/** |
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* Creates Keccak hash of a Buffer input |
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* @param a The input data (Buffer) |
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* @param bits (number = 256) The Keccak width |
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*/ |
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export const keccak = function(a: Buffer, bits: number = 256): Buffer { |
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assertIsBuffer(a) |
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switch (bits) { |
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case 224: { |
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return toBuffer(keccak224(a)) |
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} |
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case 256: { |
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return toBuffer(k256(a)) |
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} |
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case 384: { |
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return toBuffer(keccak384(a)) |
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} |
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case 512: { |
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return toBuffer(keccak512(a)) |
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} |
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default: { |
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throw new Error(`Invald algorithm: keccak${bits}`) |
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} |
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} |
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} |
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|
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/** |
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* Creates Keccak-256 hash of the input, alias for keccak(a, 256). |
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* @param a The input data (Buffer) |
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*/ |
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export const keccak256 = function(a: Buffer): Buffer { |
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return keccak(a) |
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} |
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|
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/** |
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* Creates Keccak hash of a utf-8 string input |
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* @param a The input data (String) |
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* @param bits (number = 256) The Keccak width |
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*/ |
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export const keccakFromString = function(a: string, bits: number = 256) { |
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assertIsString(a) |
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const buf = Buffer.from(a, 'utf8') |
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return keccak(buf, bits) |
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} |
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|
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/** |
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* Creates Keccak hash of an 0x-prefixed string input |
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* @param a The input data (String) |
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* @param bits (number = 256) The Keccak width |
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*/ |
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export const keccakFromHexString = function(a: string, bits: number = 256) { |
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assertIsHexString(a) |
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return keccak(toBuffer(a), bits) |
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} |
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|
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/** |
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* Creates Keccak hash of a number array input |
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* @param a The input data (number[]) |
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* @param bits (number = 256) The Keccak width |
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*/ |
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export const keccakFromArray = function(a: number[], bits: number = 256) { |
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assertIsArray(a) |
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return keccak(toBuffer(a), bits) |
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} |
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|
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/** |
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* Creates SHA256 hash of an input. |
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* @param a The input data (Buffer|Array|String) |
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*/ |
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const _sha256 = function(a: any): Buffer { |
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a = toBuffer(a) |
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return createHash('sha256') |
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.update(a) |
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.digest() |
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} |
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|
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/** |
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* Creates SHA256 hash of a Buffer input. |
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* @param a The input data (Buffer) |
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*/ |
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export const sha256 = function(a: Buffer): Buffer { |
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assertIsBuffer(a) |
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return _sha256(a) |
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} |
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|
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/** |
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* Creates SHA256 hash of a string input. |
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* @param a The input data (string) |
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*/ |
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export const sha256FromString = function(a: string): Buffer { |
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assertIsString(a) |
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return _sha256(a) |
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} |
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|
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/** |
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* Creates SHA256 hash of a number[] input. |
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* @param a The input data (number[]) |
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*/ |
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export const sha256FromArray = function(a: number[]): Buffer { |
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assertIsArray(a) |
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return _sha256(a) |
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} |
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|
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/** |
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* Creates RIPEMD160 hash of the input. |
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* @param a The input data (Buffer|Array|String|Number) |
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* @param padded Whether it should be padded to 256 bits or not |
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*/ |
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const _ripemd160 = function(a: any, padded: boolean): Buffer { |
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a = toBuffer(a) |
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const hash = createHash('rmd160') |
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.update(a) |
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.digest() |
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if (padded === true) { |
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return setLengthLeft(hash, 32) |
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} else { |
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return hash |
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} |
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} |
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|
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/** |
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* Creates RIPEMD160 hash of a Buffer input. |
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* @param a The input data (Buffer) |
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* @param padded Whether it should be padded to 256 bits or not |
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*/ |
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export const ripemd160 = function(a: Buffer, padded: boolean): Buffer { |
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assertIsBuffer(a) |
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return _ripemd160(a, padded) |
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} |
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|
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/** |
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* Creates RIPEMD160 hash of a string input. |
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* @param a The input data (String) |
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* @param padded Whether it should be padded to 256 bits or not |
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*/ |
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export const ripemd160FromString = function(a: string, padded: boolean): Buffer { |
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assertIsString(a) |
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return _ripemd160(a, padded) |
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} |
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|
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/** |
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* Creates RIPEMD160 hash of a number[] input. |
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* @param a The input data (number[]) |
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* @param padded Whether it should be padded to 256 bits or not |
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*/ |
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export const ripemd160FromArray = function(a: number[], padded: boolean): Buffer { |
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assertIsArray(a) |
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return _ripemd160(a, padded) |
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} |
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|
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/** |
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* Creates SHA-3 hash of the RLP encoded version of the input. |
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* @param a The input data |
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*/ |
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export const rlphash = function(a: Input): Buffer { |
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return keccak(encode(a)) |
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} |
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|
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/** |
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* Throws if a string is not hex prefixed |
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* @param {string} input string to check hex prefix of |
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*/ |
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export const assertIsHexString = function(input: string): void { |
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if (!isHexString(input)) { |
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const msg = `This method only supports 0x-prefixed hex strings but input was: ${input}` |
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throw new Error(msg) |
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} |
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} |
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|
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/** |
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* Throws if input is not a buffer |
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* @param {Buffer} input value to check |
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*/ |
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export const assertIsBuffer = function(input: Buffer): void { |
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if (!Buffer.isBuffer(input)) { |
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const msg = `This method only supports Buffer but input was: ${input}` |
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throw new Error(msg) |
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} |
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} |
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|
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/** |
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* Throws if input is not an array |
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* @param {number[]} input value to check |
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*/ |
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export const assertIsArray = function(input: number[]): void { |
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if (!Array.isArray(input)) { |
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const msg = `This method only supports number arrays but input was: ${input}` |
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throw new Error(msg) |
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} |
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} |
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|
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/** |
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* Throws if input is not a string |
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* @param {string} input value to check |
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*/ |
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export const assertIsString = function(input: string): void { |
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if (typeof input !== 'string') { |
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const msg = `This method only supports strings but input was: ${input}` |
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throw new Error(msg) |
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} |
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} |
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