Function generateSHA1Hash

webapp/_webapp/src/libs/helpers.ts:106–173

(inputString: string)

}

export function generateSHA1Hash(inputString: string): string {
  const encoder = new TextEncoder();
  const uint8Array = encoder.encode(inputString);

  const m = bytesToWords(uint8Array);
  const l = uint8Array.length * 8;
  const w = [];
  let H0 = 1732584193;
  let H1 = -271733879;
  let H2 = -1732584194;
  let H3 = 271733878;
  let H4 = -1009589776;

  // Padding
  m[l >> 5] |= 0x80 << (24 - (l % 32));
  m[(((l + 64) >>> 9) << 4) + 15] = l;

  for (let i = 0; i < m.length; i += 16) {
    const a = H0;
    const b = H1;
    const c = H2;
    const d = H3;
    const e = H4;

    for (let j = 0; j < 80; j++) {
      if (j < 16) w[j] = m[i + j];
      else {
        const n: number = w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16];
        w[j] = (n << 1) | (n >>> 31);
      }

      const t =
        ((H0 << 5) | (H0 >>> 27)) +
        H4 +
        (w[j] >>> 0) +
        (j < 20
          ? ((H1 & H2) | (~H1 & H3)) + 1518500249
          : j < 40
            ? (H1 ^ H2 ^ H3) + 1859775393
            : j < 60
              ? ((H1 & H2) | (H1 & H3) | (H2 & H3)) - 1894007588
              : (H1 ^ H2 ^ H3) - 899497514);

      H4 = H3;
      H3 = H2;
      H2 = (H1 << 30) | (H1 >>> 2);
      H1 = H0;
      H0 = t;
    }

    H0 += a;
    H1 += b;
    H2 += c;
    H3 += d;
    H4 += e;
  }

  const result = wordsToBytes([H0, H1, H2, H3, H4]);