56 lines
1.6 KiB
TypeScript
56 lines
1.6 KiB
TypeScript
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export let nodeCrypto: any = null
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if (typeof process !== 'undefined' && typeof require !== 'undefined') {
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try {
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nodeCrypto = require('crypto')
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} catch (e) {}
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}
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// from https://github.com/feross/typedarray-to-buffer
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// licensed under MIT
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export function typedArrayToBuffer(arr: NodeJS.TypedArray): Buffer {
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return ArrayBuffer.isView(arr)
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? // To avoid a copy, use the typed array's underlying ArrayBuffer to back
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// new Buffer, respecting the "view", i.e. byteOffset and byteLength
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Buffer.from(arr.buffer, arr.byteOffset, arr.byteLength)
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: // Pass through all other types to `Buffer.from`
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Buffer.from(arr)
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}
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export function buffersEqual(a: Buffer, b: Buffer): boolean {
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if (a.length !== b.length) return false
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for (let i = 0; i < a.length; i++) {
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if (a[i] !== b[i]) return false
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}
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return true
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}
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export function xorBuffer(data: Buffer, key: Buffer): Buffer {
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const ret = Buffer.alloc(data.length)
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for (let i = 0; i < data.length; i++) {
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ret[i] = data[i] ^ key[i]
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}
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return ret
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}
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export function xorBufferInPlace(data: Buffer, key: Buffer): void {
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for (let i = 0; i < data.length; i++) {
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data[i] ^= key[i]
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}
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}
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export function randomBytes(size: number): Buffer {
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if (nodeCrypto) return nodeCrypto.randomBytes(size)
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const ret = new Uint8Array(size)
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crypto.getRandomValues(ret)
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return typedArrayToBuffer(ret)
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}
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export function cloneBuffer(buf: Buffer, start = 0, end = buf.length): Buffer {
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const ret = Buffer.alloc(end - start)
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buf.copy(ret, 0, start, end)
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return ret
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}
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