402709e3b14201564598f33a5784e9890a6b851a1a2c18bd4e5ce4dcab3c89ce.json raw

   1  {"ast":null,"code":"/**\n * Internal Merkle-Damgard hash utils.\n * @module\n */\nimport { Hash, abytes, aexists, aoutput, clean, createView, toBytes } from \"./utils.js\";\n/** Polyfill for Safari 14. https://caniuse.com/mdn-javascript_builtins_dataview_setbiguint64 */\nexport function 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/** Choice: a ? b : c */\nexport function Chi(a, b, c) {\n  return a & b ^ ~a & c;\n}\n/** Majority function, true if any two inputs is true. */\nexport function Maj(a, b, c) {\n  return a & b ^ a & c ^ b & c;\n}\n/**\n * Merkle-Damgard hash construction base class.\n * Could be used to create MD5, RIPEMD, SHA1, SHA2.\n */\nexport class HashMD extends Hash {\n  constructor(blockLen, outputLen, padOffset, isLE) {\n    super();\n    this.finished = false;\n    this.length = 0;\n    this.pos = 0;\n    this.destroyed = false;\n    this.blockLen = blockLen;\n    this.outputLen = outputLen;\n    this.padOffset = padOffset;\n    this.isLE = isLE;\n    this.buffer = new Uint8Array(blockLen);\n    this.view = createView(this.buffer);\n  }\n  update(data) {\n    aexists(this);\n    data = toBytes(data);\n    abytes(data);\n    const {\n      view,\n      buffer,\n      blockLen\n    } = this;\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    aexists(this);\n    aoutput(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    clean(this.buffer.subarray(pos));\n    // we have less than padOffset left in buffer, so we cannot put length in\n    // 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.destroyed = destroyed;\n    to.finished = finished;\n    to.length = length;\n    to.pos = pos;\n    if (length % blockLen) to.buffer.set(buffer);\n    return to;\n  }\n  clone() {\n    return this._cloneInto();\n  }\n}\n/**\n * Initial SHA-2 state: fractional parts of square roots of first 16 primes 2..53.\n * Check out `test/misc/sha2-gen-iv.js` for recomputation guide.\n */\n/** Initial SHA256 state. Bits 0..32 of frac part of sqrt of primes 2..19 */\nexport const SHA256_IV = /* @__PURE__ */Uint32Array.from([0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]);\n/** Initial SHA224 state. Bits 32..64 of frac part of sqrt of primes 23..53 */\nexport const SHA224_IV = /* @__PURE__ */Uint32Array.from([0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939, 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4]);\n/** Initial SHA384 state. Bits 0..64 of frac part of sqrt of primes 23..53 */\nexport const SHA384_IV = /* @__PURE__ */Uint32Array.from([0xcbbb9d5d, 0xc1059ed8, 0x629a292a, 0x367cd507, 0x9159015a, 0x3070dd17, 0x152fecd8, 0xf70e5939, 0x67332667, 0xffc00b31, 0x8eb44a87, 0x68581511, 0xdb0c2e0d, 0x64f98fa7, 0x47b5481d, 0xbefa4fa4]);\n/** Initial SHA512 state. Bits 0..64 of frac part of sqrt of primes 2..19 */\nexport const SHA512_IV = /* @__PURE__ */Uint32Array.from([0x6a09e667, 0xf3bcc908, 0xbb67ae85, 0x84caa73b, 0x3c6ef372, 0xfe94f82b, 0xa54ff53a, 0x5f1d36f1, 0x510e527f, 0xade682d1, 0x9b05688c, 0x2b3e6c1f, 0x1f83d9ab, 0xfb41bd6b, 0x5be0cd19, 0x137e2179]);\n//# sourceMappingURL=_md.js.map","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}