Merge pull request #5197 from mempool/simon/sha256-secure-context-workaround
Sha256 P2PK secure context workaround
This commit is contained in:
softsimon
GitHub
commit
868dac91c7
@ -1,4 +1,5 @@
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import { Transaction, Vin } from './interfaces/electrs.interface';
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import { Hash } from './shared/sha256';
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const P2SH_P2WPKH_COST = 21 * 4; // the WU cost for the non-witness part of P2SH-P2WPKH
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const P2SH_P2WSH_COST = 35 * 4; // the WU cost for the non-witness part of P2SH-P2WSH
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@ -292,8 +293,8 @@ export async function calcScriptHash$(script: string): Promise<string> {
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throw new Error('script is not a valid hex string');
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}
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const buf = Uint8Array.from(script.match(/.{2}/g).map((byte) => parseInt(byte, 16)));
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const hashBuffer = await crypto.subtle.digest('SHA-256', buf);
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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const hash = new Hash().update(buf).digest();
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const hashArray = Array.from(new Uint8Array(hash));
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return hashArray
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.map((bytes) => bytes.toString(16).padStart(2, '0'))
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.join('');
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459
frontend/src/app/shared/sha256.ts
Normal file
459
frontend/src/app/shared/sha256.ts
Normal file
@ -0,0 +1,459 @@
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// SHA-256 (+ HMAC and PBKDF2) for JavaScript.
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//
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// Written in 2014-2016 by Dmitry Chestnykh.
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// Public domain, no warranty.
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//
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// Functions (accept and return Uint8Arrays):
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//
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// sha256(message) -> hash
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// sha256.hmac(key, message) -> mac
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// sha256.pbkdf2(password, salt, rounds, dkLen) -> dk
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//
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// Classes:
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//
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// new sha256.Hash()
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// new sha256.HMAC(key)
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//
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export const digestLength: number = 32;
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export const blockSize: number = 64;
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// SHA-256 constants
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const K = new Uint32Array([
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
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0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
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0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
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0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
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0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
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0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
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0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
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0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
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0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
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0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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]);
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function hashBlocks(w: Int32Array, v: Int32Array, p: Uint8Array, pos: number, len: number): number {
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let a: number, b: number, c: number, d: number, e: number,
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f: number, g: number, h: number, u: number, i: number,
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j: number, t1: number, t2: number;
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while (len >= 64) {
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a = v[0];
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b = v[1];
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c = v[2];
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d = v[3];
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e = v[4];
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f = v[5];
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g = v[6];
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h = v[7];
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for (i = 0; i < 16; i++) {
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j = pos + i * 4;
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w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |
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((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff));
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}
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for (i = 16; i < 64; i++) {
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u = w[i - 2];
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t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10);
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u = w[i - 15];
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t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3);
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w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0);
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}
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for (i = 0; i < 64; i++) {
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t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^
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(e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +
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((h + ((K[i] + w[i]) | 0)) | 0)) | 0;
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t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^
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(a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 0;
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h = g;
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g = f;
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f = e;
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e = (d + t1) | 0;
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d = c;
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c = b;
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b = a;
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a = (t1 + t2) | 0;
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}
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v[0] += a;
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v[1] += b;
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v[2] += c;
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v[3] += d;
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v[4] += e;
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v[5] += f;
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v[6] += g;
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v[7] += h;
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pos += 64;
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len -= 64;
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}
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return pos;
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}
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// Hash implements SHA256 hash algorithm.
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export class Hash {
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digestLength: number = digestLength;
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blockSize: number = blockSize;
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// Note: Int32Array is used instead of Uint32Array for performance reasons.
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private state: Int32Array = new Int32Array(8); // hash state
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private temp: Int32Array = new Int32Array(64); // temporary state
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private buffer: Uint8Array = new Uint8Array(128); // buffer for data to hash
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private bufferLength: number = 0; // number of bytes in buffer
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private bytesHashed: number = 0; // number of total bytes hashed
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finished: boolean = false; // indicates whether the hash was finalized
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constructor() {
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this.reset();
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}
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// Resets hash state making it possible
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// to re-use this instance to hash other data.
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reset(): this {
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this.state[0] = 0x6a09e667;
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this.state[1] = 0xbb67ae85;
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this.state[2] = 0x3c6ef372;
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this.state[3] = 0xa54ff53a;
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this.state[4] = 0x510e527f;
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this.state[5] = 0x9b05688c;
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this.state[6] = 0x1f83d9ab;
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this.state[7] = 0x5be0cd19;
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this.bufferLength = 0;
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this.bytesHashed = 0;
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this.finished = false;
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return this;
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}
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// Cleans internal buffers and re-initializes hash state.
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clean() {
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for (let i = 0; i < this.buffer.length; i++) {
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this.buffer[i] = 0;
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}
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for (let i = 0; i < this.temp.length; i++) {
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this.temp[i] = 0;
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}
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this.reset();
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}
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// Updates hash state with the given data.
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//
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// Optionally, length of the data can be specified to hash
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// fewer bytes than data.length.
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//
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// Throws error when trying to update already finalized hash:
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// instance must be reset to use it again.
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update(data: Uint8Array, dataLength: number = data.length): this {
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if (this.finished) {
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throw new Error("SHA256: can't update because hash was finished.");
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}
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let dataPos = 0;
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this.bytesHashed += dataLength;
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if (this.bufferLength > 0) {
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while (this.bufferLength < 64 && dataLength > 0) {
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this.buffer[this.bufferLength++] = data[dataPos++];
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dataLength--;
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}
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if (this.bufferLength === 64) {
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hashBlocks(this.temp, this.state, this.buffer, 0, 64);
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this.bufferLength = 0;
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}
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}
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if (dataLength >= 64) {
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dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength);
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dataLength %= 64;
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}
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while (dataLength > 0) {
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this.buffer[this.bufferLength++] = data[dataPos++];
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dataLength--;
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}
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return this;
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}
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// Finalizes hash state and puts hash into out.
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//
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// If hash was already finalized, puts the same value.
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finish(out: Uint8Array): this {
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if (!this.finished) {
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const bytesHashed = this.bytesHashed;
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const left = this.bufferLength;
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const bitLenHi = (bytesHashed / 0x20000000) | 0;
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const bitLenLo = bytesHashed << 3;
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const padLength = (bytesHashed % 64 < 56) ? 64 : 128;
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this.buffer[left] = 0x80;
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for (let i = left + 1; i < padLength - 8; i++) {
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this.buffer[i] = 0;
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}
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this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff;
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this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff;
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this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff;
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this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff;
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this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff;
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this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff;
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this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff;
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this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff;
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hashBlocks(this.temp, this.state, this.buffer, 0, padLength);
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this.finished = true;
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}
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for (let i = 0; i < 8; i++) {
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out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff;
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out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff;
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out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff;
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out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff;
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}
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return this;
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}
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// Returns the final hash digest.
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digest(): Uint8Array {
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const out = new Uint8Array(this.digestLength);
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this.finish(out);
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return out;
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}
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// Internal function for use in HMAC for optimization.
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_saveState(out: Uint32Array) {
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for (let i = 0; i < this.state.length; i++) {
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out[i] = this.state[i];
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}
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}
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// Internal function for use in HMAC for optimization.
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_restoreState(from: Uint32Array, bytesHashed: number) {
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for (let i = 0; i < this.state.length; i++) {
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this.state[i] = from[i];
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}
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this.bytesHashed = bytesHashed;
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this.finished = false;
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this.bufferLength = 0;
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}
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}
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// HMAC implements HMAC-SHA256 message authentication algorithm.
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export class HMAC {
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private inner: Hash = new Hash();
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private outer: Hash = new Hash();
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blockSize: number = this.inner.blockSize;
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digestLength: number = this.inner.digestLength;
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// Copies of hash states after keying.
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// Need for quick reset without hashing they key again.
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private istate: Uint32Array;
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private ostate: Uint32Array;
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constructor(key: Uint8Array) {
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const pad = new Uint8Array(this.blockSize);
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if (key.length > this.blockSize) {
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(new Hash()).update(key).finish(pad).clean();
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} else {
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for (let i = 0; i < key.length; i++) {
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pad[i] = key[i];
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}
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}
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for (let i = 0; i < pad.length; i++) {
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pad[i] ^= 0x36;
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}
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this.inner.update(pad);
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for (let i = 0; i < pad.length; i++) {
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pad[i] ^= 0x36 ^ 0x5c;
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}
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this.outer.update(pad);
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this.istate = new Uint32Array(8);
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this.ostate = new Uint32Array(8);
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this.inner._saveState(this.istate);
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this.outer._saveState(this.ostate);
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for (let i = 0; i < pad.length; i++) {
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pad[i] = 0;
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}
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}
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// Returns HMAC state to the state initialized with key
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// to make it possible to run HMAC over the other data with the same
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// key without creating a new instance.
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reset(): this {
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this.inner._restoreState(this.istate, this.inner.blockSize);
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this.outer._restoreState(this.ostate, this.outer.blockSize);
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return this;
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}
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// Cleans HMAC state.
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clean() {
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for (let i = 0; i < this.istate.length; i++) {
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this.ostate[i] = this.istate[i] = 0;
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}
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this.inner.clean();
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this.outer.clean();
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}
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// Updates state with provided data.
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update(data: Uint8Array): this {
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this.inner.update(data);
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return this;
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}
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// Finalizes HMAC and puts the result in out.
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finish(out: Uint8Array): this {
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if (this.outer.finished) {
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this.outer.finish(out);
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} else {
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this.inner.finish(out);
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this.outer.update(out, this.digestLength).finish(out);
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}
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return this;
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}
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// Returns message authentication code.
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digest(): Uint8Array {
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const out = new Uint8Array(this.digestLength);
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this.finish(out);
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return out;
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}
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}
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// Returns SHA256 hash of data.
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export function hash(data: Uint8Array): Uint8Array {
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const h = (new Hash()).update(data);
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const digest = h.digest();
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h.clean();
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return digest;
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}
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// Function hash is both available as module.hash and as default export.
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export default hash;
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// Returns HMAC-SHA256 of data under the key.
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export function hmac(key: Uint8Array, data: Uint8Array) {
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const h = (new HMAC(key)).update(data);
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const digest = h.digest();
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h.clean();
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return digest;
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}
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// Fills hkdf buffer like this:
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// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)
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function fillBuffer(buffer: Uint8Array, hmac: HMAC, info: Uint8Array | undefined, counter: Uint8Array) {
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// Counter is a byte value: check if it overflowed.
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const num = counter[0];
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if (num === 0) {
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throw new Error("hkdf: cannot expand more");
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}
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// Prepare HMAC instance for new data with old key.
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hmac.reset();
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// Hash in previous output if it was generated
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// (i.e. counter is greater than 1).
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if (num > 1) {
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hmac.update(buffer);
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}
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// Hash in info if it exists.
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if (info) {
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hmac.update(info);
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}
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// Hash in the counter.
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hmac.update(counter);
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// Output result to buffer and clean HMAC instance.
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hmac.finish(buffer);
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// Increment counter inside typed array, this works properly.
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counter[0]++;
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}
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const hkdfSalt = new Uint8Array(digestLength); // Filled with zeroes.
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export function hkdf(key: Uint8Array, salt: Uint8Array = hkdfSalt, info?: Uint8Array, length: number = 32) {
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const counter = new Uint8Array([1]);
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// HKDF-Extract uses salt as HMAC key, and key as data.
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const okm = hmac(salt, key);
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// Initialize HMAC for expanding with extracted key.
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// Ensure no collisions with `hmac` function.
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const hmac_ = new HMAC(okm);
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// Allocate buffer.
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const buffer = new Uint8Array(hmac_.digestLength);
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let bufpos = buffer.length;
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const out = new Uint8Array(length);
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for (let i = 0; i < length; i++) {
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if (bufpos === buffer.length) {
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fillBuffer(buffer, hmac_, info, counter);
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bufpos = 0;
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}
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out[i] = buffer[bufpos++];
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}
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hmac_.clean();
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buffer.fill(0);
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counter.fill(0);
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return out;
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}
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// Derives a key from password and salt using PBKDF2-HMAC-SHA256
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// with the given number of iterations.
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//
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// The number of bytes returned is equal to dkLen.
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//
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// (For better security, avoid dkLen greater than hash length - 32 bytes).
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export function pbkdf2(password: Uint8Array, salt: Uint8Array, iterations: number, dkLen: number) {
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const prf = new HMAC(password);
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const len = prf.digestLength;
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const ctr = new Uint8Array(4);
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const t = new Uint8Array(len);
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||||
const u = new Uint8Array(len);
|
||||
const dk = new Uint8Array(dkLen);
|
||||
|
||||
for (let i = 0; i * len < dkLen; i++) {
|
||||
let c = i + 1;
|
||||
ctr[0] = (c >>> 24) & 0xff;
|
||||
ctr[1] = (c >>> 16) & 0xff;
|
||||
ctr[2] = (c >>> 8) & 0xff;
|
||||
ctr[3] = (c >>> 0) & 0xff;
|
||||
prf.reset();
|
||||
prf.update(salt);
|
||||
prf.update(ctr);
|
||||
prf.finish(u);
|
||||
for (let j = 0; j < len; j++) {
|
||||
t[j] = u[j];
|
||||
}
|
||||
for (let j = 2; j <= iterations; j++) {
|
||||
prf.reset();
|
||||
prf.update(u).finish(u);
|
||||
for (let k = 0; k < len; k++) {
|
||||
t[k] ^= u[k];
|
||||
}
|
||||
}
|
||||
for (let j = 0; j < len && i * len + j < dkLen; j++) {
|
||||
dk[i * len + j] = t[j];
|
||||
}
|
||||
}
|
||||
for (let i = 0; i < len; i++) {
|
||||
t[i] = u[i] = 0;
|
||||
}
|
||||
for (let i = 0; i < 4; i++) {
|
||||
ctr[i] = 0;
|
||||
}
|
||||
prf.clean();
|
||||
return dk;
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user