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Refactor EC key padding length lookup into shared cryptoECC helper; add BN-254 support #26

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Merged
ljoy913 merged 3 commits into from
Jun 28, 2026
+44 −50
Merged

Refactor EC key padding length lookup into shared cryptoECC helper; add BN-254 support #26

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Copilot Jun 27, 2026
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22 changes: 22 additions & 0 deletions src/cryptoECC.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2002,6 +2002,19 @@ function MsrcryptoECC() {

var curvesInternal = {};

var curveElementLengths = {
"P-256": 32,
"P-384": 48,
"P-521": 66,
"BN-254": 32,
"NUMSP256D1": 32,
"NUMSP256T1": 32,
"NUMSP384D1": 48,
"NUMSP384T1": 48,
"NUMSP512D1": 64,
"NUMSP512T1": 64
};

var createCurve = function(curveName) {

var curveData = curvesInternal[curveName.toUpperCase()];
Expand All @@ -2028,8 +2041,17 @@ function MsrcryptoECC() {
return opp.validatePoint(point);
};

var curveElementLength = function(curveName) {
if (!curveName) {
return undefined;
}

return curveElementLengths[curveName.toUpperCase()];
};

return {
createCurve: createCurve,
curveElementLength: curveElementLength,
curves: curvesInternal,
sec1EncodingFp: sec1EncodingFp,
validatePoint: validateEccPoint,
Expand Down
14 changes: 2 additions & 12 deletions src/ecdh.js
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Original file line number Diff line number Diff line change
Expand Up @@ -156,12 +156,7 @@ if ( typeof operations !== "undefined" ) {

// Pad each value to the curve's fixed element length so leading zeros
// are preserved (matches Chrome / Chromium-based Edge behavior).
var partLen = {
"P-256": 32, "P-384": 48, "P-521": 66,
"NUMSP256D1": 32, "NUMSP256T1": 32,
"NUMSP384D1": 48, "NUMSP384T1": 48,
"NUMSP512D1": 64, "NUMSP512T1": 64
}[p.algorithm.namedCurve];
var partLen = cryptoECC.curveElementLength(p.algorithm.namedCurve);
var pad = msrcryptoUtilities.padFront;
keyPairData.publicKey.x = pad(keyPairData.publicKey.x, 0, partLen);
keyPairData.publicKey.y = pad(keyPairData.publicKey.y, 0, partLen);
Expand Down Expand Up @@ -250,12 +245,7 @@ if ( typeof operations !== "undefined" ) {

// Accept keys with or without trimmed leading zeros and pad each
// value to the curve's fixed element length (Chrome/Chromium behavior).
var partLen = {
"P-256": 32, "P-384": 48, "P-521": 66,
"NUMSP256D1": 32, "NUMSP256T1": 32,
"NUMSP384D1": 48, "NUMSP384T1": 48,
"NUMSP512D1": 64, "NUMSP512T1": 64
}[p.algorithm.namedCurve];
var partLen = cryptoECC.curveElementLength(p.algorithm.namedCurve);
if ( keyObject.x ) { keyObject.x = msrcryptoUtilities.padFront(keyObject.x, 0, partLen); }
if ( keyObject.y ) { keyObject.y = msrcryptoUtilities.padFront(keyObject.y, 0, partLen); }
if ( keyObject.d ) { keyObject.d = msrcryptoUtilities.padFront(keyObject.d, 0, partLen); }
Expand Down
14 changes: 2 additions & 12 deletions src/ecdsa.js
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Original file line number Diff line number Diff line change
Expand Up @@ -207,12 +207,7 @@ if (typeof operations !== "undefined") {

// Pad each value to the curve's fixed element length so leading zeros
// are preserved (matches Chrome / Chromium-based Edge behavior).
var partLen = {
"P-256": 32, "P-384": 48, "P-521": 66,
"NUMSP256D1": 32, "NUMSP256T1": 32,
"NUMSP384D1": 48, "NUMSP384T1": 48,
"NUMSP512D1": 64, "NUMSP512T1": 64
}[p.algorithm.namedCurve];
var partLen = cryptoECC.curveElementLength(p.algorithm.namedCurve);

function padToCurveLength( array ) {
return msrcryptoUtilities.padFront(array, 0, partLen);
Expand Down Expand Up @@ -307,12 +302,7 @@ if (typeof operations !== "undefined") {

// Accept keys with or without trimmed leading zeros and pad each
// value to the curve's fixed element length (Chrome/Chromium behavior).
var partLen = {
"P-256": 32, "P-384": 48, "P-521": 66,
"NUMSP256D1": 32, "NUMSP256T1": 32,
"NUMSP384D1": 48, "NUMSP384T1": 48,
"NUMSP512D1": 64, "NUMSP512T1": 64
}[p.algorithm.namedCurve];
var partLen = cryptoECC.curveElementLength(p.algorithm.namedCurve);
if ( keyObject.x ) { keyObject.x = msrcryptoUtilities.padFront(keyObject.x, 0, partLen); }
if ( keyObject.y ) { keyObject.y = msrcryptoUtilities.padFront(keyObject.y, 0, partLen); }
if ( keyObject.d ) { keyObject.d = msrcryptoUtilities.padFront(keyObject.d, 0, partLen); }
Expand Down
22 changes: 9 additions & 13 deletions test/Test.Ecdh.js
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Expand Up @@ -125,6 +125,10 @@ function ecdhTests() {
ts.keyGeneratePairTest(ecdhKeyAlg("P-521"), ["deriveKey", "deriveBits"], inspectEcdhKey, context(iterations, assert));
});

QUnit.test(label + " generateKeyTest BN-254", function(assert) {
ts.keyGeneratePairTest(ecdhKeyAlg("BN-254"), ["deriveKey", "deriveBits"], inspectEcdhKey, context(iterations, assert));
});

QUnit.test(label + " ts.deriveKeyTest P-256 --> Aes-Cbc-256 ", function(assert) {
ts.deriveKeyTest(ecdh.p256.DeriveKey, undefined, context(iterations, assert));
});
Expand Down Expand Up @@ -222,17 +226,9 @@ function ecdhTests() {
});
}

var ecdhKeyLengths = {
"P-256": 32,
"P-384": 48,
"P-521": 66,
"NUMSP256D1": 32,
"NUMSP256T1": 32,
"NUMSP384D1": 48,
"NUMSP384T1": 48,
"NUMSP512D1": 64,
"NUMSP512T1": 64
};
function ecdhCurveElementLength(namedCurve) {
return cryptoECC.curveElementLength(namedCurve);
}

function ecdhKeyAlg(namedCurve) {
return {
Expand All @@ -245,7 +241,7 @@ var inspectEcdhKey = {
public: function(keyObj, algorithm, usages, reason) {

var fail = [];
var expLenMax = ecdhKeyLengths[algorithm.namedCurve];
var expLenMax = ecdhCurveElementLength(algorithm.namedCurve);
var expLenMin = expLenMax;

// has crv property equal to "P-521"
Expand Down Expand Up @@ -304,7 +300,7 @@ var inspectEcdhKey = {
// }
// }

var expLenMax = ecdhKeyLengths[algorithm.namedCurve];
var expLenMax = ecdhCurveElementLength(algorithm.namedCurve);
var expLenMin = expLenMax;

this.public(keyObj, algorithm, usages, reason);
Expand Down
22 changes: 9 additions & 13 deletions test/Test.Ecdsa.js
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,10 @@ function ecdsaTests() {
ts.keyGeneratePairTest( ecdsaKeyAlg( "P-521" ), [VERIFY, SIGN], inspectEcdsaKey, context( iterations, assert ) );
} );

QUnit.test(label + " generateKeyTest BN-254", function(assert) {
ts.keyGeneratePairTest(ecdsaKeyAlg("BN-254"), [VERIFY, SIGN], inspectEcdsaKey, context(iterations, assert));
});

QUnit.test(label + " generateKeyTest NUMSP256D1", function(assert) {
ts.keyGeneratePairTest(ecdsaKeyAlg("NUMSP256D1"), [VERIFY, SIGN], inspectEcdsaKey, context(iterations, assert));
});
Expand Down Expand Up @@ -419,17 +423,9 @@ function ecdsaTests() {
});
}

var ecdsaKeyLengths = {
"P-256": 32,
"P-384": 48,
"P-521": 66,
"NUMSP256D1": 32,
"NUMSP256T1": 32,
"NUMSP384D1": 48,
"NUMSP384T1": 48,
"NUMSP512D1": 64,
"NUMSP512T1": 64
};
function ecdsaCurveElementLength(namedCurve) {
return cryptoECC.curveElementLength(namedCurve);
}

function ecdsaKeyAlg(curve) {
return {
Expand All @@ -450,7 +446,7 @@ var inspectEcdsaKey = {

var fail = [];

var expLenMax = ecdsaKeyLengths[algorithm.namedCurve];
var expLenMax = ecdsaCurveElementLength(algorithm.namedCurve);
var expLenMin = expLenMax;

// has crv property equal to "P-521"
Expand Down Expand Up @@ -493,7 +489,7 @@ var inspectEcdsaKey = {
},
private: function(keyObj, algorithm, usages, reason) {

var expLenMax = ecdsaKeyLengths[algorithm.namedCurve];
var expLenMax = ecdsaCurveElementLength(algorithm.namedCurve);
var expLenMin = expLenMax;

this.public(keyObj, algorithm, usages, reason);
Expand Down