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'use strict';
const { AsyncWrap, Providers } = internalBinding('async_wrap');
const { Buffer, kMaxLength } = require('buffer');
const { randomBytes: _randomBytes } = internalBinding('crypto');
const {
ERR_INVALID_ARG_TYPE,
ERR_INVALID_CALLBACK,
ERR_OUT_OF_RANGE
} = require('internal/errors').codes;
const { validateNumber } = require('internal/validators');
const { isArrayBufferView } = require('internal/util/types');
const kMaxUint32 = 2 ** 32 - 1;
const kMaxPossibleLength = Math.min(kMaxLength, kMaxUint32);
function assertOffset(offset, elementSize, length) {
validateNumber(offset, 'offset');
offset *= elementSize;
const maxLength = Math.min(length, kMaxPossibleLength);
if (Number.isNaN(offset) || offset > maxLength || offset < 0) {
throw new ERR_OUT_OF_RANGE('offset', `>= 0 && <= ${maxLength}`, offset);
}
return offset >>> 0; // Convert to uint32.
}
function assertSize(size, elementSize, offset, length) {
validateNumber(size, 'size');
size *= elementSize;
if (Number.isNaN(size) || size > kMaxPossibleLength || size < 0) {
throw new ERR_OUT_OF_RANGE('size',
`>= 0 && <= ${kMaxPossibleLength}`, size);
}
if (size + offset > length) {
throw new ERR_OUT_OF_RANGE('size + offset', `<= ${length}`, size + offset);
}
return size >>> 0; // Convert to uint32.
}
function randomBytes(size, cb) {
size = assertSize(size, 1, 0, Infinity);
if (cb !== undefined && typeof cb !== 'function')
throw new ERR_INVALID_CALLBACK();
const buf = Buffer.alloc(size);
if (!cb) return handleError(buf, 0, size);
const wrap = new AsyncWrap(Providers.RANDOMBYTESREQUEST);
wrap.ondone = (ex) => { // Retains buf while request is in flight.
if (ex) return cb.call(wrap, ex);
cb.call(wrap, null, buf);
};
_randomBytes(buf, 0, size, wrap);
}
function randomFillSync(buf, offset = 0, size) {
if (!isArrayBufferView(buf)) {
throw new ERR_INVALID_ARG_TYPE('buf', 'ArrayBufferView', buf);
}
const elementSize = buf.BYTES_PER_ELEMENT || 1;
offset = assertOffset(offset, elementSize, buf.byteLength);
if (size === undefined) {
size = buf.byteLength - offset;
} else {
size = assertSize(size, elementSize, offset, buf.byteLength);
}
return handleError(buf, offset, size);
}
function randomFill(buf, offset, size, cb) {
if (!isArrayBufferView(buf)) {
throw new ERR_INVALID_ARG_TYPE('buf', 'ArrayBufferView', buf);
}
const elementSize = buf.BYTES_PER_ELEMENT || 1;
if (typeof offset === 'function') {
cb = offset;
offset = 0;
size = buf.bytesLength;
} else if (typeof size === 'function') {
cb = size;
size = buf.byteLength - offset;
} else if (typeof cb !== 'function') {
throw new ERR_INVALID_CALLBACK();
}
offset = assertOffset(offset, elementSize, buf.byteLength);
if (size === undefined) {
size = buf.byteLength - offset;
} else {
size = assertSize(size, elementSize, offset, buf.byteLength);
}
const wrap = new AsyncWrap(Providers.RANDOMBYTESREQUEST);
wrap.ondone = (ex) => { // Retains buf while request is in flight.
if (ex) return cb.call(wrap, ex);
cb.call(wrap, null, buf);
};
_randomBytes(buf, offset, size, wrap);
}
function handleError(buf, offset, size) {
const ex = _randomBytes(buf, offset, size);
if (ex) throw ex;
return buf;
}
module.exports = {
randomBytes,
randomFill,
randomFillSync
};
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