85 lines
2.6 KiB
Plaintext
85 lines
2.6 KiB
Plaintext
import { SHA2 } from './_sha2.js';
|
|
import { wrapConstructor } from './utils.js';
|
|
// SHA1 was cryptographically broken.
|
|
// It is still widely used in legacy apps. Don't use it for a new protocol.
|
|
// RFC 3174
|
|
const rotl = (word, shift) => (word << shift) | ((word >>> (32 - shift)) >>> 0);
|
|
// Choice: a ? b : c
|
|
const Chi = (a, b, c) => (a & b) ^ (~a & c);
|
|
// Majority function, true if any two inpust is true
|
|
const Maj = (a, b, c) => (a & b) ^ (a & c) ^ (b & c);
|
|
// Initial state
|
|
const IV = new Uint32Array([0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0]);
|
|
// Temporary buffer, not used to store anything between runs
|
|
// Named this way because it matches specification.
|
|
const SHA1_W = new Uint32Array(80);
|
|
class SHA1 extends SHA2 {
|
|
constructor() {
|
|
super(64, 20, 8, false);
|
|
this.A = IV[0] | 0;
|
|
this.B = IV[1] | 0;
|
|
this.C = IV[2] | 0;
|
|
this.D = IV[3] | 0;
|
|
this.E = IV[4] | 0;
|
|
}
|
|
get() {
|
|
const { A, B, C, D, E } = this;
|
|
return [A, B, C, D, E];
|
|
}
|
|
set(A, B, C, D, E) {
|
|
this.A = A | 0;
|
|
this.B = B | 0;
|
|
this.C = C | 0;
|
|
this.D = D | 0;
|
|
this.E = E | 0;
|
|
}
|
|
process(view, offset) {
|
|
for (let i = 0; i < 16; i++, offset += 4)
|
|
SHA1_W[i] = view.getUint32(offset, false);
|
|
for (let i = 16; i < 80; i++)
|
|
SHA1_W[i] = rotl(SHA1_W[i - 3] ^ SHA1_W[i - 8] ^ SHA1_W[i - 14] ^ SHA1_W[i - 16], 1);
|
|
// Compression function main loop, 80 rounds
|
|
let { A, B, C, D, E } = this;
|
|
for (let i = 0; i < 80; i++) {
|
|
let F, K;
|
|
if (i < 20) {
|
|
F = Chi(B, C, D);
|
|
K = 0x5a827999;
|
|
}
|
|
else if (i < 40) {
|
|
F = B ^ C ^ D;
|
|
K = 0x6ed9eba1;
|
|
}
|
|
else if (i < 60) {
|
|
F = Maj(B, C, D);
|
|
K = 0x8f1bbcdc;
|
|
}
|
|
else {
|
|
F = B ^ C ^ D;
|
|
K = 0xca62c1d6;
|
|
}
|
|
const T = (rotl(A, 5) + F + E + K + SHA1_W[i]) | 0;
|
|
E = D;
|
|
D = C;
|
|
C = rotl(B, 30);
|
|
B = A;
|
|
A = T;
|
|
}
|
|
// Add the compressed chunk to the current hash value
|
|
A = (A + this.A) | 0;
|
|
B = (B + this.B) | 0;
|
|
C = (C + this.C) | 0;
|
|
D = (D + this.D) | 0;
|
|
E = (E + this.E) | 0;
|
|
this.set(A, B, C, D, E);
|
|
}
|
|
roundClean() {
|
|
SHA1_W.fill(0);
|
|
}
|
|
destroy() {
|
|
this.set(0, 0, 0, 0, 0);
|
|
this.buffer.fill(0);
|
|
}
|
|
}
|
|
export const sha1 = wrapConstructor(() => new SHA1());
|
|
//# sourceMappingURL=sha1.js.map |