@noble/hashes/esm/_assert.js

Audited & minimal 0-dependency JS implementation of SHA, RIPEMD, BLAKE, HMAC, HKDF, PBKDF & Scrypt

/**
 * Internal assertion helpers.
 * @module
 */
/** Asserts something is positive integer. */
function anumber(n) {
    if (!Number.isSafeInteger(n) || n < 0)
        throw new Error('positive integer expected, got ' + n);
}
/** Is number an Uint8Array? Copied from utils for perf. */
function isBytes(a) {
    return a instanceof Uint8Array || (ArrayBuffer.isView(a) && a.constructor.name === 'Uint8Array');
}
/** Asserts something is Uint8Array. */
function abytes(b, ...lengths) {
    if (!isBytes(b))
        throw new Error('Uint8Array expected');
    if (lengths.length > 0 && !lengths.includes(b.length))
        throw new Error('Uint8Array expected of length ' + lengths + ', got length=' + b.length);
}
/** Asserts something is hash */
function ahash(h) {
    if (typeof h !== 'function' || typeof h.create !== 'function')
        throw new Error('Hash should be wrapped by utils.wrapConstructor');
    anumber(h.outputLen);
    anumber(h.blockLen);
}
/** Asserts a hash instance has not been destroyed / finished */
function aexists(instance, checkFinished = true) {
    if (instance.destroyed)
        throw new Error('Hash instance has been destroyed');
    if (checkFinished && instance.finished)
        throw new Error('Hash#digest() has already been called');
}
/** Asserts output is properly-sized byte array */
function aoutput(out, instance) {
    abytes(out);
    const min = instance.outputLen;
    if (out.length < min) {
        throw new Error('digestInto() expects output buffer of length at least ' + min);
    }
}
export { anumber, abytes, ahash, aexists, aoutput };
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