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ECDH tests: quick and dirty ASN1 parsing

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Paul Miller 2023-11-01 15:54:08 +00:00
parent c19373a0b5
commit a4abd8a202
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1 changed files with 37 additions and 44 deletions
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81
test/nist.test.js
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@ -95,31 +95,42 @@ should('fields', () => {
for (const n in vectors) deepStrictEqual(NIST[n].CURVE.Fp.ORDER, vectors[n]);
});
// 1. We don't support ASN.1 encoding of points, so we ignore these vectors
// 2. Overall our parser is very strict, so we ignore padded (invalid) private keys, etc.
function verifyECDHVector(test, curve) {
if (test.flags.includes('InvalidAsn')) return; // Ignore invalid ASN
if (test.result === 'valid' || test.result === 'acceptable') {
const fpLen = curve.CURVE.Fp.BYTES; // 32 for P256
const encodedHexLen = fpLen * 2 * 2 + 2; // 130 (65 * 2) for P256
const privA = test.private;
const pubB = test.public.slice(-encodedHexLen); // slice(-130) for P256
if (!curve.utils.isValidPrivateKey(privA)) return; // Ignore invalid private key size
try {
curve.ProjectivePoint.fromHex(pubB);
} catch (e) {
if (e.message.startsWith('Point of length')) return; // Ignore
throw e;
}
const shared = curve.getSharedSecret(privA, pubB).subarray(1);
deepStrictEqual(hex(shared), test.shared, 'valid');
} else if (test.result === 'invalid') {
let failed = false;
try {
curve.getSharedSecret(test.private, test.public);
} catch (error) {
failed = true;
}
deepStrictEqual(failed, true, 'invalid');
} else throw new Error('unknown test result');
}
describe('wycheproof ECDH', () => {
for (const group of ecdh.testGroups) {
const CURVE = NIST[group.curve];
if (!CURVE) continue;
const curve = NIST[group.curve];
if (!curve) continue;
should(group.curve, () => {
for (const test of group.tests) {
if (test.result === 'valid' || test.result === 'acceptable') {
try {
const pub = CURVE.ProjectivePoint.fromHex(test.public);
} catch (e) {
// Our strict validation filter doesn't let weird-length DER vectors
if (e.message.startsWith('Point of length')) continue;
throw e;
}
const shared = CURVE.getSharedSecret(test.private, test.public);
deepStrictEqual(shared, test.shared, 'valid');
} else if (test.result === 'invalid') {
let failed = false;
try {
CURVE.getSharedSecret(test.private, test.public);
} catch (error) {
failed = true;
}
deepStrictEqual(failed, true, 'invalid');
} else throw new Error('unknown test result');
verifyECDHVector(test, curve);
}
});
}
@ -151,30 +162,12 @@ describe('wycheproof ECDH', () => {
for (const name in WYCHEPROOF_ECDH) {
const { curve, tests } = WYCHEPROOF_ECDH[name];
for (let i = 0; i < tests.length; i++) {
const test = tests[i];
for (let j = 0; j < test.testGroups.length; j++) {
const group = test.testGroups[j];
should(`additional ${name} (${i}/${j})`, () => {
const curveTests = tests[i];
for (let j = 0; j < curveTests.testGroups.length; j++) {
const group = curveTests.testGroups[j];
should(`additional ${name} (${group.tests.length})`, () => {
for (const test of group.tests) {
if (test.result === 'valid' || test.result === 'acceptable') {
try {
const pub = curve.ProjectivePoint.fromHex(test.public);
} catch (e) {
// Our strict validation filter doesn't let weird-length DER vectors
if (e.message.includes('Point of length')) continue;
throw e;
}
const shared = curve.getSharedSecret(test.private, test.public);
deepStrictEqual(hex(shared), test.shared, 'valid');
} else if (test.result === 'invalid') {
let failed = false;
try {
curve.getSharedSecret(test.private, test.public);
} catch (error) {
failed = true;
}
deepStrictEqual(failed, true, 'invalid');
} else throw new Error('unknown test result');
verifyECDHVector(test, curve);
}
});
}