javascript - 使用 Node.js 'jsrsasign' 库验证 .NET Bouncy CaSTLe 库生成的签名

Question

我正在使用 Bouncy CaSTLe 库在 C# 中生成签名，如下所示:

var privateKeyBase64 = "MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQgg8/MbvGGTDMDpfje8lQBZ8st+l3SK7jRl7OWlyUl/VagCgYIKoZIzj0DAQehRANCAARkQIUpkKbxmJJicvG450JH900JjmJOGdlMCZl3BIXvPBBKkaTMsQc6l3O4vJA6Yc23nr3Ox/KwFUl6gdo5iTqV";
var publicKeyBase64 = "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEZECFKZCm8ZiSYnLxuOdCR/dNCY5iThnZTAmZdwSF7zwQSpGkzLEHOpdzuLyQOmHNt569zsfysBVJeoHaOYk6lQ==";

var plainText = "aaa";
var plainTextBytes = Encoding.UTF8.GetBytes(plainText);

// Sign
var privateKey = PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKeyBase64));
var signer = SignerUtilities.GetSigner(X9ObjectIdentifiers.ECDsaWithSha512.Id);
signer.Init(true, privateKey);
signer.BlockUpdate(plainTextBytes, 0, plainTextBytes.Length);

var signature = signer.GenerateSignature();
var signatureBase64 = Convert.ToBase64String(signature);

Console.WriteLine("Signature base64: {0}", signatureBase64);

// Verify
Console.WriteLine("-------------------- Verifying signature ");
Console.WriteLine("Public key base64: {0}", publicKeyBase64);

var publicKey = PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyBase64));
var verifier = SignerUtilities.GetSigner(X9ObjectIdentifiers.ECDsaWithSha512.Id);
verifier.Init(false, publicKey);
verifier.BlockUpdate(plainTextBytes, 0, plainTextBytes.Length);
Console.WriteLine("Signature valid?: {0}", verifier.VerifySignature(Convert.FromBase64String(signatureBase64)));

// Prints: MEUCIBEcfv2o3UwqwV72CVuYi7HbjcoiuSQOULY5d+DuGt3UAiEAtoNrdNWvjfdz/vR6nPiD+RveKN5znBtYaIrRDp2K7Ks=

在 node.js 应用程序中，我使用的是 jsrsasign在相同的有效载荷上验证生成的签名如下:

let rs = require('jsrsasign');
let pem = `-----BEGIN PUBLIC KEY----- MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEZECFKZCm8ZiSYnLxuOdCR/dNCY5iThnZTAmZdwSF7zwQSpGkzLEHOpdzuLyQOmHNt569zsfysBVJeoHaOYk6lQ== -----END PUBLIC KEY-----`;

let plainText = 'aaa';

let signature = 'MEUCIBEcfv2o3UwqwV72CVuYi7HbjcoiuSQOULY5d+DuGt3UAiEAtoNrdNWvjfdz/vR6nPiD+RveKN5znBtYaIrRDp2K7Ks=';
let signatureHex = Buffer.from(signature, 'base64').toString('hex');

var sig = new rs.Signature({alg: 'SHA512withECDSA'});
sig.init(pem);
sig.updateString(plainText);
var isValid = sig.verify(signatureHex);
console.log('Is signature valid: ', isValid); // <--- returns false always! 

如果您能帮助我找出问题所在，我将不胜感激。

我也接受其他 Node.js 库的建议，这些库可以验证使用 ECDSA 和 SHA512 生成的签名。

Answer 1

这很可能是 jsrsasign 库中的一个错误，它使用哈希函数生成错误的 ECDSA 签名，其输出大于 n 的位长度(以位为单位)。等待作者的回答，更多详情请看这里https://github.com/kjur/jsrsasign/issues/394 .

使用另一个包椭圆曲线包并手动生成+ chop 有效负载的哈希，我能够验证C#中的Bouncy CaSTLe生成的签名是有效的:

let elliptic = <any>window.require('elliptic');
let hash = <any>window.require('hash.js')
let ec = new elliptic.ec('p256');

// Same key from my original post, just hex encoded
let keyPair = ec.keyFromPrivate("83CFCC6EF1864C3303A5F8DEF2540167CB2DFA5DD22BB8D197B396972525FD56");
let pubKey = keyPair.getPublic();

// The first 32 bytes (256 bits) of the SHA521 hash of the payload "aaa"
// sha512('aaa') => d6f644b19812e97b5d871658d6d3400ecd4787faeb9b8990c1e7608288664be77257104a58d033bcf1a0e0945ff06468ebe53e2dff36e248424c7273117dac09
let msgHash = 'd6f644b19812e97b5d871658d6d3400ecd4787faeb9b8990c1e7608288664be7'

// Same signature from original post above
let signatureBase64 = 'MEUCIBEcfv2o3UwqwV72CVuYi7HbjcoiuSQOULY5d+DuGt3UAiEAtoNrdNWvjfdz/vR6nPiD+RveKN5znBtYaIrRDp2K7Ks='
let signatureHex = Buffer.from(signatureBase64, 'base64').toString('hex');
let validSig = ec.verify(msgHash, signatureHex, pubKey);
console.log("Signature valid?", validSig);   // <------- prints TRUE