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• [FILE] CHANGELOG.md
• [FILE] LICENSE
• [FILE] README.md
• [FILE] index.d.ts
• [FILE] index.js
• [FILE] index.ts
• [FILE] package.json

Просмотр файла: index.ts

import { Buffer as SafeBuffer } from 'buffer/';

interface Digest {
  update(data: string | Buffer | Uint8Array, encoding?: string): this;
  digest(): Buffer;
  digest(encoding: string): string;
}

/**
 * From https://github.com/crypto-browserify/sha.js/blob/master/sha256.js
 * 
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
 * in FIPS 180-2
 * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 *
 */
export class sha256js implements Digest {
  static K = [
    0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
    0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
    0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
    0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
    0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
    0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
    0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
    0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
    0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
    0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
    0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
    0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
    0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
    0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
    0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
    0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
  ];
  _block: Buffer;
  _blockSize = 64;
  _finalSize = 56;
  _len = 0;
  _w = new Array<number>(64);
  _a = 0x6a09e667;
  _b = 0xbb67ae85;
  _c = 0x3c6ef372;
  _d = 0xa54ff53a;
  _e = 0x510e527f;
  _f = 0x9b05688c;
  _g = 0x1f83d9ab;
  _h = 0x5be0cd19;

  constructor () {
    this._block = SafeBuffer.alloc(this._blockSize) as unknown as Buffer
  }

  update(data: string | Buffer | Uint8Array, encoding?: string) {
    if (typeof data === 'string') {
      encoding = encoding || 'utf8'
      data = SafeBuffer.from(data, encoding) as unknown as Buffer;
    }
    
    const block = this._block
    const blockSize = this._blockSize
    const length = data.length
    let accum = this._len

    for (let offset = 0; offset < length;) {
      const assigned = accum % blockSize
      const remainder = Math.min(length - offset, blockSize - assigned)

      for (let i = 0; i < remainder; i++) {
        block[assigned + i] = data[offset + i]
      }

      accum += remainder
      offset += remainder

      if ((accum % blockSize) === 0) {
        this._update(block)
      }
    }

    this._len += length
    return this
  }

  digest(): Buffer;
  digest(encoding: string): string;
  digest(encoding?: string): Buffer | string {
    const rem = this._len % this._blockSize

    this._block[rem] = 0x80

    // zero (rem + 1) trailing bits, where (rem + 1) is the smallest
    // non-negative solution to the equation (length + 1 + (rem + 1)) === finalSize mod blockSize
    this._block.fill(0, rem + 1)

    if (rem >= this._finalSize) {
      this._update(this._block)
      this._block.fill(0)
    }

    const bits = this._len * 8

    // uint32
    if (bits <= 0xffffffff) {
      this._block.writeUInt32BE(bits, this._blockSize - 4)

    // uint64
    } else {
      const lowBits = (bits & 0xffffffff) >>> 0
      const highBits = (bits - lowBits) / 0x100000000

      this._block.writeUInt32BE(highBits, this._blockSize - 8)
      this._block.writeUInt32BE(lowBits, this._blockSize - 4)
    }

    this._update(this._block)

    const hash = SafeBuffer.alloc(32) as unknown as Buffer;
    hash.writeInt32BE(this._a, 0)
    hash.writeInt32BE(this._b, 4)
    hash.writeInt32BE(this._c, 8)
    hash.writeInt32BE(this._d, 12)
    hash.writeInt32BE(this._e, 16)
    hash.writeInt32BE(this._f, 20)
    hash.writeInt32BE(this._g, 24)
    hash.writeInt32BE(this._h, 28)

    return encoding ? hash.toString(encoding as BufferEncoding) : hash
  }

  private ch(x: number, y: number, z: number) {
    return z ^ (x & (y ^ z))
  }

  private maj(x: number, y: number, z: number) {
    return (x & y) | (z & (x | y))
  }

  private sigma0(x: number) {
    return (x >>> 2 | x << 30) ^ (x >>> 13 | x << 19) ^ (x >>> 22 | x << 10)
  }

  private sigma1 (x: number) {
    return (x >>> 6 | x << 26) ^ (x >>> 11 | x << 21) ^ (x >>> 25 | x << 7)
  }

  private gamma0 (x: number) {
    return (x >>> 7 | x << 25) ^ (x >>> 18 | x << 14) ^ (x >>> 3)
  }

  private gamma1 (x: number) {
    return (x >>> 17 | x << 15) ^ (x >>> 19 | x << 13) ^ (x >>> 10)
  }

  private _update(M: Buffer) {
    const W = this._w

    let a = this._a | 0
    let b = this._b | 0
    let c = this._c | 0
    let d = this._d | 0
    let e = this._e | 0
    let f = this._f | 0
    let g = this._g | 0
    let h = this._h | 0

    let i = 0;
    for (; i < 16; ++i) W[i] = M.readInt32BE(i * 4)
    for (; i < 64; ++i) W[i] = (this.gamma1(W[i - 2]) + W[i - 7] + this.gamma0(W[i - 15]) + W[i - 16]) | 0

    for (let j = 0; j < 64; ++j) {
      const T1 = (h + this.sigma1(e) + this.ch(e, f, g) + sha256js.K[j] + W[j]) | 0
      const T2 = (this.sigma0(a) + this.maj(a, b, c)) | 0

      h = g
      g = f
      f = e
      e = (d + T1) | 0
      d = c
      c = b
      b = a
      a = (T1 + T2) | 0
    }

    this._a = (a + this._a) | 0
    this._b = (b + this._b) | 0
    this._c = (c + this._c) | 0
    this._d = (d + this._d) | 0
    this._e = (e + this._e) | 0
    this._f = (f + this._f) | 0
    this._g = (g + this._g) | 0
    this._h = (h + this._h) | 0
  }
}

export class sha256nodeCrypto implements Digest {
  hash: Digest;
  static nodeCryptoCreateHash: any;
  static useCryptoModuleCache: boolean = true;
  constructor() {
    if (!sha256nodeCrypto.useCryptoModuleCache || sha256nodeCrypto.nodeCryptoCreateHash === undefined) {
      sha256nodeCrypto.nodeCryptoCreateHash = require('crypto').createHash;
    }
    this.hash = sha256nodeCrypto.nodeCryptoCreateHash('sha256');
  }
  update(data: string | Buffer | Uint8Array, encoding?: string): this {
    this.hash.update(data, encoding);
    return this;
  }
  digest(): Buffer;
  digest(encoding: string): string;
  digest(encoding?: string): Buffer | string {
    if (encoding) {
      return this.hash.digest(encoding);
    } else {
      return this.hash.digest();
    }
  }
}

let _nodeCryptoAvailable: boolean | undefined = undefined;
function isNodeCryptoAvailable(): boolean {
  if (sha256nodeCrypto.useCryptoModuleCache && _nodeCryptoAvailable !== undefined) {
    return _nodeCryptoAvailable;
  }
  let isAvailable = false;
  try {
    if (typeof require === 'function') {
      const cryptoModule = require('crypto');
      isAvailable = cryptoModule && typeof cryptoModule.createHash === 'function';
    }
  } catch (error) {
    // ignore
  }
  _nodeCryptoAvailable = isAvailable;
  return isAvailable;
}

export class sha256 implements Digest {
  instance: Digest;
  constructor() {
    if (isNodeCryptoAvailable()) {
      this.instance = new sha256nodeCrypto();
    } else {
      this.instance = new sha256js();
    }
  }
  update(data: string | Buffer | Uint8Array, encoding?: string): this {
    this.instance.update(data, encoding);
    return this;
  }
  digest(): Buffer;
  digest(encoding: string): string;
  digest(encoding?: string) {
    if (encoding) {
      return this.instance.digest(encoding);
    } else {
      return this.instance.digest();
    }
  }
}

/**
 * Use Nodejs `crypto` module if available, otherwise uses js implementation.
 * @param data Input data to hash.
 */
export function hashSha256(data: Buffer): Buffer {
  return new sha256().update(data).digest();
}

export default hashSha256;

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