89 lines
3.9 KiB
TypeScript
89 lines
3.9 KiB
TypeScript
const K = new Uint32Array([
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
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]);
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function rotate(value: number, amount: number): number {
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return (value >>> amount) | (value << (32 - amount));
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}
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export class IncrementalSha256 {
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private readonly state = new Uint32Array([0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]);
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private readonly block = new Uint8Array(64);
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private blockLength = 0;
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private bytes = 0;
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private finished = false;
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update(value: ArrayBuffer | Uint8Array): this {
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if (this.finished) throw new Error("SHA-256 digest is already finalized");
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const data = value instanceof Uint8Array ? value : new Uint8Array(value);
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this.bytes += data.byteLength;
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let offset = 0;
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while (offset < data.byteLength) {
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const length = Math.min(64 - this.blockLength, data.byteLength - offset);
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this.block.set(data.subarray(offset, offset + length), this.blockLength);
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this.blockLength += length;
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offset += length;
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if (this.blockLength === 64) {
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this.compress(this.block);
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this.blockLength = 0;
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}
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}
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return this;
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}
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hex(): string {
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if (!this.finished) {
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const bitLength = this.bytes * 8;
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this.block[this.blockLength++] = 0x80;
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if (this.blockLength > 56) {
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this.block.fill(0, this.blockLength);
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this.compress(this.block);
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this.blockLength = 0;
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}
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this.block.fill(0, this.blockLength, 56);
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const view = new DataView(this.block.buffer);
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view.setUint32(56, Math.floor(bitLength / 0x1_0000_0000), false);
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view.setUint32(60, bitLength >>> 0, false);
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this.compress(this.block);
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this.finished = true;
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}
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return Array.from(this.state, (word) => word.toString(16).padStart(8, "0")).join("");
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}
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private compress(block: Uint8Array): void {
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const words = new Uint32Array(64);
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const view = new DataView(block.buffer, block.byteOffset, 64);
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for (let index = 0; index < 16; index++) words[index] = view.getUint32(index * 4, false);
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for (let index = 16; index < 64; index++) {
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const s0 = rotate(words[index - 15], 7) ^ rotate(words[index - 15], 18) ^ (words[index - 15] >>> 3);
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const s1 = rotate(words[index - 2], 17) ^ rotate(words[index - 2], 19) ^ (words[index - 2] >>> 10);
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words[index] = (words[index - 16] + s0 + words[index - 7] + s1) >>> 0;
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}
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let [a, b, c, d, e, f, g, h] = this.state;
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for (let index = 0; index < 64; index++) {
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const s1 = rotate(e, 6) ^ rotate(e, 11) ^ rotate(e, 25);
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const choose = (e & f) ^ (~e & g);
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const t1 = (h + s1 + choose + K[index] + words[index]) >>> 0;
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const s0 = rotate(a, 2) ^ rotate(a, 13) ^ rotate(a, 22);
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const majority = (a & b) ^ (a & c) ^ (b & c);
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const t2 = (s0 + majority) >>> 0;
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h = g; g = f; f = e; e = (d + t1) >>> 0; d = c; c = b; b = a; a = (t1 + t2) >>> 0;
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}
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this.state[0] = (this.state[0] + a) >>> 0;
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this.state[1] = (this.state[1] + b) >>> 0;
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this.state[2] = (this.state[2] + c) >>> 0;
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this.state[3] = (this.state[3] + d) >>> 0;
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this.state[4] = (this.state[4] + e) >>> 0;
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this.state[5] = (this.state[5] + f) >>> 0;
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this.state[6] = (this.state[6] + g) >>> 0;
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this.state[7] = (this.state[7] + h) >>> 0;
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}
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}
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