Press n or j to go to the next uncovered block, b, p or k for the previous block.
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// TextEncoder nor crypto.subtle, so the SDK carries its own implementations.
import { toUint8 } from './util.js';
/** UTF-8 encode a string. Lone surrogates become U+FFFD, the same as TextEncoder. */
export function utf8Encode(str) {
const s = String(str);
const out = new Uint8Array(s.length * 3);
let p = 0;
for (let i = 0; i < s.length; i++) {
let c = s.charCodeAt(i);
if (c < 0x80) {
out[p++] = c;
continue;
}
if (c < 0x800) {
out[p++] = 0xc0 | (c >> 6);
out[p++] = 0x80 | (c & 0x3f);
continue;
}
if (c >= 0xd800 && c <= 0xdbff) {
const d = i + 1 < s.length ? s.charCodeAt(i + 1) : 0;
if (d >= 0xdc00 && d <= 0xdfff) {
const cp = 0x10000 + ((c - 0xd800) << 10) + (d - 0xdc00);
out[p++] = 0xf0 | (cp >> 18);
out[p++] = 0x80 | ((cp >> 12) & 0x3f);
out[p++] = 0x80 | ((cp >> 6) & 0x3f);
out[p++] = 0x80 | (cp & 0x3f);
i++;
continue;
}
c = 0xfffd;
} else if (c >= 0xdc00 && c <= 0xdfff) {
c = 0xfffd;
}
out[p++] = 0xe0 | (c >> 12);
out[p++] = 0x80 | ((c >> 6) & 0x3f);
out[p++] = 0x80 | (c & 0x3f);
}
return out.slice(0, p);
}
/** UTF-8 decode with U+FFFD replacement for malformed input (WHATWG decoder rules). */
export function utf8Decode(input) {
const b = toBytes(input);
const n = b.length;
let out = '';
let units = [];
let i = 0;
while (i < n) {
const c = b[i];
if (c < 0x80) {
units.push(c);
i++;
} else {
let need = 0;
let cp = 0;
let lower = 0x80;
let upper = 0xbf;
if (c >= 0xc2 && c <= 0xdf) {
need = 1;
cp = c & 0x1f;
} else if (c >= 0xe0 && c <= 0xef) {
need = 2;
cp = c & 0x0f;
if (c === 0xe0) lower = 0xa0;
if (c === 0xed) upper = 0x9f;
} else if (c >= 0xf0 && c <= 0xf4) {
need = 3;
cp = c & 0x07;
if (c === 0xf0) lower = 0x90;
if (c === 0xf4) upper = 0x8f;
} else {
units.push(0xfffd);
i++;
continue;
}
let j = 1;
let ok = true;
for (; j <= need; j++) {
const d = i + j < n ? b[i + j] : -1;
if (d < lower || d > upper) {
ok = false;
break;
}
lower = 0x80;
upper = 0xbf;
cp = (cp << 6) | (d & 0x3f);
}
if (!ok) {
units.push(0xfffd);
i += j;
continue;
}
i += need + 1;
if (cp >= 0x10000) {
cp -= 0x10000;
units.push(0xd800 + (cp >> 10), 0xdc00 + (cp & 0x3ff));
} else {
units.push(cp);
}
}
if (units.length >= 8192) {
out += String.fromCharCode.apply(null, units);
units = [];
}
}
if (units.length) out += String.fromCharCode.apply(null, units);
return out;
}
const B64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
/** Standard Base64 with padding. */
export function base64Encode(input) {
const b = toBytes(input);
let out = '';
let i = 0;
for (; i + 2 < b.length; i += 3) {
const v = (b[i] << 16) | (b[i + 1] << 8) | b[i + 2];
out += B64[(v >>> 18) & 63] + B64[(v >>> 12) & 63] + B64[(v >>> 6) & 63] + B64[v & 63];
}
const rest = b.length - i;
if (rest === 1) {
const v = b[i] << 16;
out += B64[(v >>> 18) & 63] + B64[(v >>> 12) & 63] + '==';
} else if (rest === 2) {
const v = (b[i] << 16) | (b[i + 1] << 8);
out += B64[(v >>> 18) & 63] + B64[(v >>> 12) & 63] + B64[(v >>> 6) & 63] + '=';
}
return out;
}
const K = [
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,
];
/** SHA-256 digest (32 bytes) of a string (UTF-8) or bytes. */
export function sha256(input) {
const msg = toBytes(input);
const n = msg.length;
const total = Math.ceil((n + 9) / 64) * 64;
const buf = new Uint8Array(total);
buf.set(msg);
buf[n] = 0x80;
const dv = new DataView(buf.buffer);
dv.setUint32(total - 8, Math.floor(n / 0x20000000), false);
dv.setUint32(total - 4, (n * 8) >>> 0, false);
let h0 = 0x6a09e667;
let h1 = 0xbb67ae85 | 0;
let h2 = 0x3c6ef372;
let h3 = 0xa54ff53a | 0;
let h4 = 0x510e527f;
let h5 = 0x9b05688c | 0;
let h6 = 0x1f83d9ab;
let h7 = 0x5be0cd19;
const w = new Int32Array(64);
for (let off = 0; off < total; off += 64) {
for (let t = 0; t < 16; t++) w[t] = dv.getInt32(off + t * 4, false);
for (let t = 16; t < 64; t++) {
const x = w[t - 15];
const y = w[t - 2];
const s0 = ((x >>> 7) | (x << 25)) ^ ((x >>> 18) | (x << 14)) ^ (x >>> 3);
const s1 = ((y >>> 17) | (y << 15)) ^ ((y >>> 19) | (y << 13)) ^ (y >>> 10);
w[t] = (w[t - 16] + s0 + w[t - 7] + s1) | 0;
}
let a = h0;
let b = h1;
let c = h2;
let d = h3;
let e = h4;
let f = h5;
let g = h6;
let h = h7;
for (let t = 0; t < 64; t++) {
const S1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));
const ch = (e & f) ^ (~e & g);
const t1 = (h + S1 + ch + K[t] + w[t]) | 0;
const S0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));
const maj = (a & b) ^ (a & c) ^ (b & c);
const t2 = (S0 + maj) | 0;
h = g;
g = f;
f = e;
e = (d + t1) | 0;
d = c;
c = b;
b = a;
a = (t1 + t2) | 0;
}
h0 = (h0 + a) | 0;
h1 = (h1 + b) | 0;
h2 = (h2 + c) | 0;
h3 = (h3 + d) | 0;
h4 = (h4 + e) | 0;
h5 = (h5 + f) | 0;
h6 = (h6 + g) | 0;
h7 = (h7 + h) | 0;
}
const out = new Uint8Array(32);
const odv = new DataView(out.buffer);
odv.setInt32(0, h0, false);
odv.setInt32(4, h1, false);
odv.setInt32(8, h2, false);
odv.setInt32(12, h3, false);
odv.setInt32(16, h4, false);
odv.setInt32(20, h5, false);
odv.setInt32(24, h6, false);
odv.setInt32(28, h7, false);
return out;
}
/** HMAC-SHA256 (RFC 2104) of message under key. Strings are UTF-8 encoded. */
export function hmacSha256(key, message) {
let k = toBytes(key);
if (k.length > 64) k = sha256(k);
const msg = toBytes(message);
const inner = new Uint8Array(64 + msg.length);
const outer = new Uint8Array(64 + 32);
for (let i = 0; i < 64; i++) {
const kb = i < k.length ? k[i] : 0;
inner[i] = kb ^ 0x36;
outer[i] = kb ^ 0x5c;
}
inner.set(msg, 64);
outer.set(sha256(inner), 64);
return sha256(outer);
}
function toBytes(input) {
if (typeof input === 'string') return utf8Encode(input);
const u8 = toUint8(input);
if (!u8) throw new TypeError('expected a string, ArrayBuffer or ArrayBufferView');
return u8;
}
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