wallet-core/packages/taler-util/src/sha256.ts
2022-09-21 15:45:41 -03:00

374 lines
9.9 KiB
TypeScript

// 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;
}