50 lines
1.4 KiB
Plaintext
50 lines
1.4 KiB
Plaintext
export function number(n: number) {
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if (!Number.isSafeInteger(n) || n < 0) throw new Error(`Wrong positive integer: ${n}`);
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}
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export function bool(b: boolean) {
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if (typeof b !== 'boolean') throw new Error(`Expected boolean, not ${b}`);
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}
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export function bytes(b: Uint8Array | undefined, ...lengths: number[]) {
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if (!(b instanceof Uint8Array)) throw new TypeError('Expected Uint8Array');
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if (lengths.length > 0 && !lengths.includes(b.length))
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throw new TypeError(`Expected Uint8Array of length ${lengths}, not of length=${b.length}`);
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}
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type Hash = {
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(data: Uint8Array): Uint8Array;
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blockLen: number;
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outputLen: number;
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create: any;
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};
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export function hash(hash: Hash) {
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if (typeof hash !== 'function' || typeof hash.create !== 'function')
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throw new Error('Hash should be wrapped by utils.wrapConstructor');
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number(hash.outputLen);
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number(hash.blockLen);
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}
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export function exists(instance: any, checkFinished = true) {
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if (instance.destroyed) throw new Error('Hash instance has been destroyed');
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if (checkFinished && instance.finished) throw new Error('Hash#digest() has already been called');
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}
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export function output(out: any, instance: any) {
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bytes(out);
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const min = instance.outputLen;
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if (out.length < min) {
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throw new Error(`digestInto() expects output buffer of length at least ${min}`);
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}
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}
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const assert = {
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number,
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bool,
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bytes,
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hash,
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exists,
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output,
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};
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export default assert;
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