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mod.ts
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/
mod.ts
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import {
encode,
decode
} from "./deps.ts";
/** Byte length of a SHA256 hash. */
export const BYTES: number = 32;
/** A class representation of the SHA256 algorithm. */
export class SHA256 {
readonly hashSize: number = BYTES;
private _buf: Uint8Array;
private _bufIdx!: number;
private _count!: Uint32Array;
private _K: Uint32Array;
private _H!: Uint32Array;
private _finalized!: boolean;
/** Creates a SHA256 instance. */
constructor() {
this._buf = new Uint8Array(64);
// prettier-ignore
this._K = new Uint32Array([
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
]);
this.init();
}
/** Initializes a hash. */
init(): SHA256 {
// prettier-ignore
this._H = new Uint32Array([
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
]);
this._bufIdx = 0;
this._count = new Uint32Array(2);
this._buf.fill(0);
this._finalized = false;
return this;
}
/** Updates the hash with additional message data. */
update(msg: string | Uint8Array, inputEncoding?: string): SHA256 {
if (msg === null) {
throw new TypeError("msg must be a string or Uint8Array.");
} else if (typeof msg === "string") {
msg = encode(msg, inputEncoding) as Uint8Array;
}
// process the msg as many times as possible, the rest is stored in the buffer
// message is processed in 512 bit (64 byte chunks)
for (let i: number = 0, len = msg.length; i < len; i++) {
this._buf[this._bufIdx++] = msg[i];
if (this._bufIdx === 64) {
this._transform();
this._bufIdx = 0;
}
}
// counter update (number of message bits)
const c: Uint32Array = this._count;
if ((c[0] += msg.length << 3) < msg.length << 3) {
c[1]++;
}
c[1] += msg.length >>> 29;
return this;
}
/** Finalizes the hash with additional message data. */
digest(outputEncoding?: string): string | Uint8Array {
if (this._finalized) {
throw new Error("digest has already been called.")
}
this._finalized = true;
// append '1'
const b: Uint8Array = this._buf;
let idx: number = this._bufIdx;
b[idx++] = 0x80;
// zeropad up to byte pos 56
while (idx !== 56) {
if (idx === 64) {
this._transform();
idx = 0;
}
b[idx++] = 0;
}
// append length in bits
const c: Uint32Array = this._count;
b[56] = (c[1] >>> 24) & 0xff;
b[57] = (c[1] >>> 16) & 0xff;
b[58] = (c[1] >>> 8) & 0xff;
b[59] = (c[1] >>> 0) & 0xff;
b[60] = (c[0] >>> 24) & 0xff;
b[61] = (c[0] >>> 16) & 0xff;
b[62] = (c[0] >>> 8) & 0xff;
b[63] = (c[0] >>> 0) & 0xff;
this._transform();
// return the hash as byte array
const hash: Uint8Array = new Uint8Array(BYTES);
// let i: number;
for (let i: number = 0; i < 8; i++) {
hash[(i << 2) + 0] = (this._H[i] >>> 24) & 0xff;
hash[(i << 2) + 1] = (this._H[i] >>> 16) & 0xff;
hash[(i << 2) + 2] = (this._H[i] >>> 8) & 0xff;
hash[(i << 2) + 3] = (this._H[i] >>> 0) & 0xff;
}
// clear internal states and prepare for new hash
this.init();
return outputEncoding ? decode(hash, outputEncoding) : hash;
}
/** Performs one transformation cycle. */
private _transform(): void {
const h: Uint32Array = this._H;
let h0: number = h[0];
let h1: number = h[1];
let h2: number = h[2];
let h3: number = h[3];
let h4: number = h[4];
let h5: number = h[5];
let h6: number = h[6];
let h7: number = h[7];
// convert byte buffer into w[0..15]
const w: Uint32Array = new Uint32Array(16);
let i: number;
for (i = 0; i < 16; i++) {
w[i] =
this._buf[(i << 2) + 3] |
(this._buf[(i << 2) + 2] << 8) |
(this._buf[(i << 2) + 1] << 16) |
(this._buf[i << 2] << 24);
}
for (i = 0; i < 64; i++) {
let tmp: number;
if (i < 16) {
tmp = w[i];
} else {
let a = w[(i + 1) & 15];
let b = w[(i + 14) & 15];
tmp = w[i & 15] =
(((a >>> 7) ^ (a >>> 18) ^ (a >>> 3) ^ (a << 25) ^ (a << 14)) +
((b >>> 17) ^ (b >>> 19) ^ (b >>> 10) ^ (b << 15) ^ (b << 13)) +
w[i & 15] +
w[(i + 9) & 15]) |
0;
}
tmp =
(tmp +
h7 +
((h4 >>> 6) ^
(h4 >>> 11) ^
(h4 >>> 25) ^
(h4 << 26) ^
(h4 << 21) ^
(h4 << 7)) +
(h6 ^ (h4 & (h5 ^ h6))) +
this._K[i]) |
0;
h7 = h6;
h6 = h5;
h5 = h4;
h4 = h3 + tmp;
h3 = h2;
h2 = h1;
h1 = h0;
h0 =
(tmp +
((h1 & h2) ^ (h3 & (h1 ^ h2))) +
((h1 >>> 2) ^
(h1 >>> 13) ^
(h1 >>> 22) ^
(h1 << 30) ^
(h1 << 19) ^
(h1 << 10))) |
0;
}
h[0] = (h[0] + h0) | 0;
h[1] = (h[1] + h1) | 0;
h[2] = (h[2] + h2) | 0;
h[3] = (h[3] + h3) | 0;
h[4] = (h[4] + h4) | 0;
h[5] = (h[5] + h5) | 0;
h[6] = (h[6] + h6) | 0;
h[7] = (h[7] + h7) | 0;
}
}
/** Generates a SHA256 hash of the input data. */
export function sha256(
msg: string | Uint8Array,
inputEncoding?: string,
outputEncoding?: string
): string | Uint8Array {
return new SHA256().update(msg, inputEncoding).digest(outputEncoding);
}