35 lines
689 B
JavaScript
35 lines
689 B
JavaScript
const assert = require('nanoassert')
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module.exports = {
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crypto_verify_16,
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crypto_verify_32,
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sodium_memcmp,
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sodium_is_zero
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}
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function vn (x, xi, y, yi, n) {
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var i, d = 0
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for (i = 0; i < n; i++) d |= x[xi + i] ^ y[yi + i]
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return (1 & ((d - 1) >>> 8)) - 1
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}
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function crypto_verify_16(x, xi, y, yi) {
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return vn(x, xi, y, yi, 16)
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}
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function crypto_verify_32(x, xi, y, yi) {
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return vn(x, xi, y, yi, 32)
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}
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function sodium_memcmp (a, b) {
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assert(a.byteLength === b.byteLength, 'buffers must be the same size')
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return vn(a, 0, b, 0, a.byteLength) === 0
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}
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function sodium_is_zero (arr) {
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var d = 0
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for (let i = 0; i < arr.length; i++) d |= arr[i]
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return d === 0
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}
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