43 lines
1.4 KiB
TypeScript
43 lines
1.4 KiB
TypeScript
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/**
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* Constant-time byte comparison. Mirrors `@shade/core` `constantTimeEqual`
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* but is duplicated here so the KT package has no runtime dependency on
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* `@shade/core` for primitive comparisons (it depends on it for error
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* types only).
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*/
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export function constantTimeEqual(a: Uint8Array, b: Uint8Array): boolean {
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if (a.length !== b.length) return false;
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let diff = 0;
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for (let i = 0; i < a.length; i++) {
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diff |= a[i]! ^ b[i]!;
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}
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return diff === 0;
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}
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/**
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* Encode bytes to standard base64 (no URL variant). Avoids platform-specific
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* `Buffer` so the KT package works in browsers, Bun, and Workers.
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*/
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export function toBase64(bytes: Uint8Array): string {
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if (typeof Buffer !== 'undefined') return Buffer.from(bytes).toString('base64');
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let str = '';
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for (let i = 0; i < bytes.length; i++) str += String.fromCharCode(bytes[i]!);
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return btoa(str);
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}
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export function fromBase64(s: string): Uint8Array {
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if (typeof Buffer !== 'undefined') return new Uint8Array(Buffer.from(s, 'base64'));
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const str = atob(s);
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const out = new Uint8Array(str.length);
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for (let i = 0; i < str.length; i++) out[i] = str.charCodeAt(i);
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return out;
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}
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/** Stable hex encoding for log_id rendering. */
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export function toHex(bytes: Uint8Array): string {
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let s = '';
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for (let i = 0; i < bytes.length; i++) {
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s += bytes[i]!.toString(16).padStart(2, '0');
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}
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return s;
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}
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