Cool_Tools/CyberChef
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make the ECDSA JSON signature parsing more robust

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also rename the format to "Raw JSON"
as I will later introduce "JSON Web Signature"
This commit is contained in:
CPlusSharp 2024-04-14 12:42:44 +02:00
parent 7b54d9e873
commit 1fbc7e03f0
4 changed files with 70 additions and 19 deletions
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4
src/core/operations/ECDSASign.mjs
View File

@ -48,7 +48,7 @@ class ECDSASign extends Operation {
value: [
"ASN.1 HEX",
"P1363 HEX",
"JSON"
"Raw JSON"
]
}
];
@ -86,7 +86,7 @@ class ECDSASign extends Operation {
case "P1363 HEX":
result = r.KJUR.crypto.ECDSA.asn1SigToConcatSig(signatureASN1Hex);
break;
case "JSON": {
case "Raw JSON": {
const signatureRS = r.KJUR.crypto.ECDSA.parseSigHexInHexRS(signatureASN1Hex);
result = JSON.stringify(signatureRS);
break;

31
src/core/operations/ECDSASignatureConversion.mjs
View File

@ -5,6 +5,7 @@
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import r from "jsrsasign";
/**
@ -32,7 +33,7 @@ class ECDSASignatureConversion extends Operation {
"Auto",
"ASN.1 HEX",
"P1363 HEX",
"JSON"
"Raw JSON"
]
},
{
@ -41,7 +42,7 @@ class ECDSASignatureConversion extends Operation {
value: [
"ASN.1 HEX",
"P1363 HEX",
"JSON"
"Raw JSON"
]
}
];
@ -57,11 +58,19 @@ class ECDSASignatureConversion extends Operation {
const outputFormat = args[1];
// detect input format
let inputJson;
if (inputFormat === "Auto") {
if (input.substr(0, 2) === "30" && r.ASN1HEX.isASN1HEX(input)) {
try {
inputJson = JSON.parse(input);
if (typeof(inputJson) === "object") {
inputFormat = "Raw JSON";
}
} catch {}
}
if (inputFormat === "Auto") {
if (input.substring(0, 2) === "30" && r.ASN1HEX.isASN1HEX(input)) {
inputFormat = "ASN.1 HEX";
} else if (input.indexOf("{") !== -1) {
inputFormat = "JSON";
} else {
inputFormat = "P1363 HEX";
}
@ -76,8 +85,14 @@ class ECDSASignatureConversion extends Operation {
case "P1363 HEX":
signatureASN1Hex = r.KJUR.crypto.ECDSA.concatSigToASN1Sig(input);
break;
case "JSON": {
const inputJson = JSON.parse(input);
case "Raw JSON": {
if (!inputJson) inputJson = JSON.parse(input);
if (!inputJson.r) {
throw new OperationError('No "r" value in the signature JSON');
}
if (!inputJson.s) {
throw new OperationError('No "s" value in the signature JSON');
}
signatureASN1Hex = r.KJUR.crypto.ECDSA.hexRSSigToASN1Sig(inputJson.r, inputJson.s);
break;
}
@ -92,7 +107,7 @@ class ECDSASignatureConversion extends Operation {
case "P1363 HEX":
result = r.KJUR.crypto.ECDSA.asn1SigToConcatSig(signatureASN1Hex);
break;
case "JSON": {
case "Raw JSON": {
const signatureRS = r.KJUR.crypto.ECDSA.parseSigHexInHexRS(signatureASN1Hex);
result = JSON.stringify(signatureRS);
break;

26
src/core/operations/ECDSAVerify.mjs
View File

@ -33,7 +33,7 @@ class ECDSAVerify extends Operation {
"Auto",
"ASN.1 HEX",
"P1363 HEX",
"JSON"
"Raw JSON"
]
},
{
@ -74,11 +74,19 @@ class ECDSAVerify extends Operation {
}
// detect input format
let inputJson;
if (inputFormat === "Auto") {
if (input.substr(0, 2) === "30" && r.ASN1HEX.isASN1HEX(input)) {
try {
inputJson = JSON.parse(input);
if (typeof(inputJson) === "object") {
inputFormat = "Raw JSON";
}
} catch {}
}
if (inputFormat === "Auto") {
if (input.substring(0, 2) === "30" && r.ASN1HEX.isASN1HEX(input)) {
inputFormat = "ASN.1 HEX";
} else if (input.indexOf("{") !== -1) {
inputFormat = "JSON";
} else {
inputFormat = "P1363 HEX";
}
@ -93,8 +101,14 @@ class ECDSAVerify extends Operation {
case "P1363 HEX":
signatureASN1Hex = r.KJUR.crypto.ECDSA.concatSigToASN1Sig(input);
break;
case "JSON": {
const inputJson = JSON.parse(input);
case "Raw JSON": {
if (!inputJson) inputJson = JSON.parse(input);
if (!inputJson.r) {
throw new OperationError('No "r" value in the signature JSON');
}
if (!inputJson.s) {
throw new OperationError('No "s" value in the signature JSON');
}
signatureASN1Hex = r.KJUR.crypto.ECDSA.hexRSSigToASN1Sig(inputJson.r, inputJson.s);
break;
}

28
tests/operations/tests/ECDSA.mjs
View File

@ -271,6 +271,28 @@ TestRegister.addTests([
}
]
},
{
name: "ECDSA Verify: JSON signature missing r",
input: JSON.stringify({s: JSON.parse(P256.signature.sha256.json).s}),
expectedOutput: 'No "r" value in the signature JSON',
recipeConfig: [
{
"op": "ECDSA Verify",
"args": ["Auto", "SHA-256", P256.publicKey, ASCII_TEXT]
}
]
},
{
name: "ECDSA Verify: JSON signature missing s",
input: JSON.stringify({r: JSON.parse(P256.signature.sha256.json).r}),
expectedOutput: 'No "s" value in the signature JSON',
recipeConfig: [
{
"op": "ECDSA Verify",
"args": ["Auto", "SHA-256", P256.publicKey, ASCII_TEXT]
}
]
},
{
name: "ECDSA Verify: Using private key fails",
input: P256.signature.sha256.asn1,
@ -324,7 +346,7 @@ TestRegister.addTests([
recipeConfig: [
{
"op": "ECDSA Signature Conversion",
"args": ["Auto", "JSON"]
"args": ["Auto", "Raw JSON"]
}
]
},
@ -357,7 +379,7 @@ TestRegister.addTests([
recipeConfig: [
{
"op": "ECDSA Signature Conversion",
"args": ["Auto", "JSON"]
"args": ["Auto", "Raw JSON"]
}
]
},
@ -390,7 +412,7 @@ TestRegister.addTests([
recipeConfig: [
{
"op": "ECDSA Signature Conversion",
"args": ["Auto", "JSON"]
"args": ["Auto", "Raw JSON"]
}
]
}