45 lines
1.2 KiB
TypeScript
45 lines
1.2 KiB
TypeScript
/// Minimal RFC 4648 base32 encode/decode for TOTP secret parsing.
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///
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/// Mirrors the encoder in crates/relicario-core/src/item.rs:base32_encode.
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/// Decode is case-insensitive, tolerates whitespace and `=` padding.
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const ALPHA = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
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export function base32Encode(bytes: Uint8Array): string {
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let out = '';
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let buffer = 0;
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let bits = 0;
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for (const b of bytes) {
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buffer = (buffer << 8) | b;
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bits += 8;
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while (bits >= 5) {
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const idx = (buffer >> (bits - 5)) & 0x1f;
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out += ALPHA[idx];
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bits -= 5;
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}
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}
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if (bits > 0) {
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const idx = (buffer << (5 - bits)) & 0x1f;
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out += ALPHA[idx];
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}
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return out;
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}
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export function base32Decode(input: string): Uint8Array {
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const cleaned = input.replace(/\s+/g, '').replace(/=+$/g, '').toUpperCase();
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const out: number[] = [];
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let buffer = 0;
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let bits = 0;
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for (const ch of cleaned) {
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const idx = ALPHA.indexOf(ch);
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if (idx === -1) throw new Error(`base32: invalid character "${ch}"`);
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buffer = (buffer << 5) | idx;
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bits += 5;
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if (bits >= 8) {
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out.push((buffer >> (bits - 8)) & 0xff);
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bits -= 8;
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}
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}
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return new Uint8Array(out);
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}
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