27357d350824a797dddaad65799c83bdb62981322f4cdea6cf6315d90cb4f2a6.json raw

   1  {"ast":null,"code":"import assert from './_assert.js';\nimport { Hash, createView, toBytes } from './utils.js';\n// Polyfill for Safari 14\nfunction setBigUint64(view, byteOffset, value, isLE) {\n  if (typeof view.setBigUint64 === 'function') return view.setBigUint64(byteOffset, value, isLE);\n  const _32n = BigInt(32);\n  const _u32_max = BigInt(0xffffffff);\n  const wh = Number(value >> _32n & _u32_max);\n  const wl = Number(value & _u32_max);\n  const h = isLE ? 4 : 0;\n  const l = isLE ? 0 : 4;\n  view.setUint32(byteOffset + h, wh, isLE);\n  view.setUint32(byteOffset + l, wl, isLE);\n}\n// Base SHA2 class (RFC 6234)\nexport class SHA2 extends Hash {\n  constructor(blockLen, outputLen, padOffset, isLE) {\n    super();\n    this.blockLen = blockLen;\n    this.outputLen = outputLen;\n    this.padOffset = padOffset;\n    this.isLE = isLE;\n    this.finished = false;\n    this.length = 0;\n    this.pos = 0;\n    this.destroyed = false;\n    this.buffer = new Uint8Array(blockLen);\n    this.view = createView(this.buffer);\n  }\n  update(data) {\n    assert.exists(this);\n    const {\n      view,\n      buffer,\n      blockLen\n    } = this;\n    data = toBytes(data);\n    const len = data.length;\n    for (let pos = 0; pos < len;) {\n      const take = Math.min(blockLen - this.pos, len - pos);\n      // Fast path: we have at least one block in input, cast it to view and process\n      if (take === blockLen) {\n        const dataView = createView(data);\n        for (; blockLen <= len - pos; pos += blockLen) this.process(dataView, pos);\n        continue;\n      }\n      buffer.set(data.subarray(pos, pos + take), this.pos);\n      this.pos += take;\n      pos += take;\n      if (this.pos === blockLen) {\n        this.process(view, 0);\n        this.pos = 0;\n      }\n    }\n    this.length += data.length;\n    this.roundClean();\n    return this;\n  }\n  digestInto(out) {\n    assert.exists(this);\n    assert.output(out, this);\n    this.finished = true;\n    // Padding\n    // We can avoid allocation of buffer for padding completely if it\n    // was previously not allocated here. But it won't change performance.\n    const {\n      buffer,\n      view,\n      blockLen,\n      isLE\n    } = this;\n    let {\n      pos\n    } = this;\n    // append the bit '1' to the message\n    buffer[pos++] = 0b10000000;\n    this.buffer.subarray(pos).fill(0);\n    // we have less than padOffset left in buffer, so we cannot put length in current block, need process it and pad again\n    if (this.padOffset > blockLen - pos) {\n      this.process(view, 0);\n      pos = 0;\n    }\n    // Pad until full block byte with zeros\n    for (let i = pos; i < blockLen; i++) buffer[i] = 0;\n    // Note: sha512 requires length to be 128bit integer, but length in JS will overflow before that\n    // You need to write around 2 exabytes (u64_max / 8 / (1024**6)) for this to happen.\n    // So we just write lowest 64 bits of that value.\n    setBigUint64(view, blockLen - 8, BigInt(this.length * 8), isLE);\n    this.process(view, 0);\n    const oview = createView(out);\n    const len = this.outputLen;\n    // NOTE: we do division by 4 later, which should be fused in single op with modulo by JIT\n    if (len % 4) throw new Error('_sha2: outputLen should be aligned to 32bit');\n    const outLen = len / 4;\n    const state = this.get();\n    if (outLen > state.length) throw new Error('_sha2: outputLen bigger than state');\n    for (let i = 0; i < outLen; i++) oview.setUint32(4 * i, state[i], isLE);\n  }\n  digest() {\n    const {\n      buffer,\n      outputLen\n    } = this;\n    this.digestInto(buffer);\n    const res = buffer.slice(0, outputLen);\n    this.destroy();\n    return res;\n  }\n  _cloneInto(to) {\n    to || (to = new this.constructor());\n    to.set(...this.get());\n    const {\n      blockLen,\n      buffer,\n      length,\n      finished,\n      destroyed,\n      pos\n    } = this;\n    to.length = length;\n    to.pos = pos;\n    to.finished = finished;\n    to.destroyed = destroyed;\n    if (length % blockLen) to.buffer.set(buffer);\n    return to;\n  }\n}\n//# sourceMappingURL=_sha2.js.map","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}