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-rw-r--r--src/crypto/primitives/sha256.ts426
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diff --git a/src/crypto/primitives/sha256.ts b/src/crypto/primitives/sha256.ts
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--- a/src/crypto/primitives/sha256.ts
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-// SHA-256 for JavaScript.
-//
-// Written in 2014-2016 by Dmitry Chestnykh.
-// Public domain, no warranty.
-//
-// Functions (accept and return Uint8Arrays):
-//
-// sha256(message) -> hash
-// sha256.hmac(key, message) -> mac
-//
-// Classes:
-//
-// new sha256.Hash()
-export const digestLength = 32;
-export const blockSize = 64;
-
-// SHA-256 constants
-const 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,
-]);
-
-function hashBlocks(
- w: Int32Array,
- v: Int32Array,
- p: Uint8Array,
- pos: number,
- len: number,
-): number {
- let a: number,
- b: number,
- c: number,
- d: number,
- e: number,
- f: number,
- g: number,
- h: number,
- u: number,
- i: number,
- j: number,
- t1: number,
- t2: number;
- while (len >= 64) {
- a = v[0];
- b = v[1];
- c = v[2];
- d = v[3];
- e = v[4];
- f = v[5];
- g = v[6];
- h = v[7];
-
- for (i = 0; i < 16; i++) {
- j = pos + i * 4;
- w[i] =
- ((p[j] & 0xff) << 24) |
- ((p[j + 1] & 0xff) << 16) |
- ((p[j + 2] & 0xff) << 8) |
- (p[j + 3] & 0xff);
- }
-
- for (i = 16; i < 64; i++) {
- u = w[i - 2];
- t1 =
- ((u >>> 17) | (u << (32 - 17))) ^
- ((u >>> 19) | (u << (32 - 19))) ^
- (u >>> 10);
-
- u = w[i - 15];
- t2 =
- ((u >>> 7) | (u << (32 - 7))) ^
- ((u >>> 18) | (u << (32 - 18))) ^
- (u >>> 3);
-
- w[i] = ((t1 + w[i - 7]) | 0) + ((t2 + w[i - 16]) | 0);
- }
-
- for (i = 0; i < 64; i++) {
- t1 =
- ((((((e >>> 6) | (e << (32 - 6))) ^
- ((e >>> 11) | (e << (32 - 11))) ^
- ((e >>> 25) | (e << (32 - 25)))) +
- ((e & f) ^ (~e & g))) |
- 0) +
- ((h + ((K[i] + w[i]) | 0)) | 0)) |
- 0;
-
- t2 =
- ((((a >>> 2) | (a << (32 - 2))) ^
- ((a >>> 13) | (a << (32 - 13))) ^
- ((a >>> 22) | (a << (32 - 22)))) +
- ((a & b) ^ (a & c) ^ (b & c))) |
- 0;
-
- h = g;
- g = f;
- f = e;
- e = (d + t1) | 0;
- d = c;
- c = b;
- b = a;
- a = (t1 + t2) | 0;
- }
-
- v[0] += a;
- v[1] += b;
- v[2] += c;
- v[3] += d;
- v[4] += e;
- v[5] += f;
- v[6] += g;
- v[7] += h;
-
- pos += 64;
- len -= 64;
- }
- return pos;
-}
-
-// Hash implements SHA256 hash algorithm.
-export class HashSha256 {
- digestLength: number = digestLength;
- blockSize: number = blockSize;
-
- // Note: Int32Array is used instead of Uint32Array for performance reasons.
- private state: Int32Array = new Int32Array(8); // hash state
- private temp: Int32Array = new Int32Array(64); // temporary state
- private buffer: Uint8Array = new Uint8Array(128); // buffer for data to hash
- private bufferLength = 0; // number of bytes in buffer
- private bytesHashed = 0; // number of total bytes hashed
-
- finished = false; // indicates whether the hash was finalized
-
- constructor() {
- this.reset();
- }
-
- // Resets hash state making it possible
- // to re-use this instance to hash other data.
- reset(): this {
- this.state[0] = 0x6a09e667;
- this.state[1] = 0xbb67ae85;
- this.state[2] = 0x3c6ef372;
- this.state[3] = 0xa54ff53a;
- this.state[4] = 0x510e527f;
- this.state[5] = 0x9b05688c;
- this.state[6] = 0x1f83d9ab;
- this.state[7] = 0x5be0cd19;
- this.bufferLength = 0;
- this.bytesHashed = 0;
- this.finished = false;
- return this;
- }
-
- // Cleans internal buffers and re-initializes hash state.
- clean(): void {
- for (let i = 0; i < this.buffer.length; i++) {
- this.buffer[i] = 0;
- }
- for (let i = 0; i < this.temp.length; i++) {
- this.temp[i] = 0;
- }
- this.reset();
- }
-
- // Updates hash state with the given data.
- //
- // Optionally, length of the data can be specified to hash
- // fewer bytes than data.length.
- //
- // Throws error when trying to update already finalized hash:
- // instance must be reset to use it again.
- update(data: Uint8Array, dataLength: number = data.length): this {
- if (this.finished) {
- throw new Error("SHA256: can't update because hash was finished.");
- }
- let dataPos = 0;
- this.bytesHashed += dataLength;
- if (this.bufferLength > 0) {
- while (this.bufferLength < 64 && dataLength > 0) {
- this.buffer[this.bufferLength++] = data[dataPos++];
- dataLength--;
- }
- if (this.bufferLength === 64) {
- hashBlocks(this.temp, this.state, this.buffer, 0, 64);
- this.bufferLength = 0;
- }
- }
- if (dataLength >= 64) {
- dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength);
- dataLength %= 64;
- }
- while (dataLength > 0) {
- this.buffer[this.bufferLength++] = data[dataPos++];
- dataLength--;
- }
- return this;
- }
-
- // Finalizes hash state and puts hash into out.
- //
- // If hash was already finalized, puts the same value.
- finish(out: Uint8Array): this {
- if (!this.finished) {
- const bytesHashed = this.bytesHashed;
- const left = this.bufferLength;
- const bitLenHi = (bytesHashed / 0x20000000) | 0;
- const bitLenLo = bytesHashed << 3;
- const padLength = bytesHashed % 64 < 56 ? 64 : 128;
-
- this.buffer[left] = 0x80;
- for (let i = left + 1; i < padLength - 8; i++) {
- this.buffer[i] = 0;
- }
- this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff;
- this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff;
- this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff;
- this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff;
- this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff;
- this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff;
- this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff;
- this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff;
-
- hashBlocks(this.temp, this.state, this.buffer, 0, padLength);
-
- this.finished = true;
- }
-
- for (let i = 0; i < 8; i++) {
- out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff;
- out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff;
- out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff;
- out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff;
- }
-
- return this;
- }
-
- // Returns the final hash digest.
- digest(): Uint8Array {
- const out = new Uint8Array(this.digestLength);
- this.finish(out);
- return out;
- }
-
- // Internal function for use in HMAC for optimization.
- _saveState(out: Uint32Array): void {
- for (let i = 0; i < this.state.length; i++) {
- out[i] = this.state[i];
- }
- }
-
- // Internal function for use in HMAC for optimization.
- _restoreState(from: Uint32Array, bytesHashed: number): void {
- for (let i = 0; i < this.state.length; i++) {
- this.state[i] = from[i];
- }
- this.bytesHashed = bytesHashed;
- this.finished = false;
- this.bufferLength = 0;
- }
-}
-
-// HMAC implements HMAC-SHA256 message authentication algorithm.
-export class HMAC {
- private inner: HashSha256 = new HashSha256();
- private outer: HashSha256 = new HashSha256();
-
- blockSize: number = this.inner.blockSize;
- digestLength: number = this.inner.digestLength;
-
- // Copies of hash states after keying.
- // Need for quick reset without hashing they key again.
- private istate: Uint32Array;
- private ostate: Uint32Array;
-
- constructor(key: Uint8Array) {
- const pad = new Uint8Array(this.blockSize);
- if (key.length > this.blockSize) {
- new HashSha256().update(key).finish(pad).clean();
- } else {
- for (let i = 0; i < key.length; i++) {
- pad[i] = key[i];
- }
- }
- for (let i = 0; i < pad.length; i++) {
- pad[i] ^= 0x36;
- }
- this.inner.update(pad);
-
- for (let i = 0; i < pad.length; i++) {
- pad[i] ^= 0x36 ^ 0x5c;
- }
- this.outer.update(pad);
-
- this.istate = new Uint32Array(8);
- this.ostate = new Uint32Array(8);
-
- this.inner._saveState(this.istate);
- this.outer._saveState(this.ostate);
-
- for (let i = 0; i < pad.length; i++) {
- pad[i] = 0;
- }
- }
-
- // Returns HMAC state to the state initialized with key
- // to make it possible to run HMAC over the other data with the same
- // key without creating a new instance.
- reset(): this {
- this.inner._restoreState(this.istate, this.inner.blockSize);
- this.outer._restoreState(this.ostate, this.outer.blockSize);
- return this;
- }
-
- // Cleans HMAC state.
- clean(): void {
- for (let i = 0; i < this.istate.length; i++) {
- this.ostate[i] = this.istate[i] = 0;
- }
- this.inner.clean();
- this.outer.clean();
- }
-
- // Updates state with provided data.
- update(data: Uint8Array): this {
- this.inner.update(data);
- return this;
- }
-
- // Finalizes HMAC and puts the result in out.
- finish(out: Uint8Array): this {
- if (this.outer.finished) {
- this.outer.finish(out);
- } else {
- this.inner.finish(out);
- this.outer.update(out, this.digestLength).finish(out);
- }
- return this;
- }
-
- // Returns message authentication code.
- digest(): Uint8Array {
- const out = new Uint8Array(this.digestLength);
- this.finish(out);
- return out;
- }
-}
-
-// Returns SHA256 hash of data.
-export function sha256(data: Uint8Array): Uint8Array {
- const h = new HashSha256().update(data);
- const digest = h.digest();
- h.clean();
- return digest;
-}
-
-// Returns HMAC-SHA256 of data under the key.
-export function hmacSha256(key: Uint8Array, data: Uint8Array): Uint8Array {
- const h = new HMAC(key).update(data);
- const digest = h.digest();
- h.clean();
- return digest;
-}
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