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crypto: use byteLength in timingSafeEqual #29657

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crypto: use byteLength in timingSafeEqual #29657

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f63569b
crypto: use byteLength in timingSafeEqual
ZaneHannanAU Oct 8, 2018
8f42de8
errors: improve byteLength error message
tniessen Sep 22, 2019
e1ada5b
test: simplify timingSafeEqual test case
tniessen Sep 23, 2019
8f12d81
Update lib/internal/errors.js
tniessen Sep 23, 2019
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2 changes: 1 addition & 1 deletion lib/internal/crypto/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ function timingSafeEqual(buf1, buf2) {
throw new ERR_INVALID_ARG_TYPE('buf2',
['Buffer', 'TypedArray', 'DataView'], buf2);
}
if (buf1.length !== buf2.length) {
if (buf1.byteLength !== buf2.byteLength) {
throw new ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH();
}
return _timingSafeEqual(buf1, buf2);
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2 changes: 1 addition & 1 deletion lib/internal/errors.js
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Expand Up @@ -755,7 +755,7 @@ E('ERR_CRYPTO_SCRYPT_NOT_SUPPORTED', 'Scrypt algorithm not supported', Error);
// Switch to TypeError. The current implementation does not seem right.
E('ERR_CRYPTO_SIGN_KEY_REQUIRED', 'No key provided to sign', Error);
E('ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH',
'Input buffers must have the same length', RangeError);
'Input buffers must have the same byte length', RangeError);
E('ERR_DNS_SET_SERVERS_FAILED', 'c-ares failed to set servers: "%s" [%s]',
Error);
E('ERR_DOMAIN_CALLBACK_NOT_AVAILABLE',
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16 changes: 15 additions & 1 deletion test/sequential/test-crypto-timing-safe-equal.js
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Expand Up @@ -18,12 +18,26 @@ assert.strictEqual(
false
);

{
// Test TypedArrays with different lengths but equal byteLengths.
const buf = crypto.randomBytes(16).buffer;
const a1 = new Uint8Array(buf);
const a2 = new Uint16Array(buf);
const a3 = new Uint32Array(buf);

for (const left of [a1, a2, a3]) {
for (const right of [a1, a2, a3]) {
assert.strictEqual(crypto.timingSafeEqual(left, right), true);
}
}
}

common.expectsError(
() => crypto.timingSafeEqual(Buffer.from([1, 2, 3]), Buffer.from([1, 2])),
{
code: 'ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH',
type: RangeError,
message: 'Input buffers must have the same length'
message: 'Input buffers must have the same byte length'
}
);

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