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我試圖將我的RSA密鑰對大小從1024升級到2048.我將在此處給出示例代碼。從編碼字符串(RSA公鑰)中提取RSA參數(模數和指數)
爲1024: 在我的代碼的第一步是使用Java代碼
try {
// Generate Public & Private Keys
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
KeyPair keyPair = kpg.genKeyPair();
RSAPublicKey key = (RSAPublicKey) keyPair.getPublic();
System.out.println("Modulus");
System.out.println(key.getModulus());
String publicKey = encode(key.getModulus().toByteArray()) + encode(key.getPublicExponent().toByteArray());
// Build the Signature
Signature sig = Signature.getInstance("SHA256withRSA");
sig.initSign(keyPair.getPrivate());
seedData = seedData + "ABC";
sig.update(seedData.getBytes("UTF-8"));
String signature = encode(sig.sign());
signatureString.append(signature);
// Embed the public key in the signature
int publicKeyLocation = signatureString.charAt(signatureString.length() - 2) % 40;
// Add some random bytes at the end
int randomBytesToAdd = signatureString.charAt(signatureString.length() - 10) % 9;
System.out.println("Random bytes to add");
System.out.println(randomBytesToAdd);
System.out.println("Adding Random bytes that are:");
String s = randomString(randomBytesToAdd);
signatureString.insert(publicKeyLocation, s);
} catch (Exception e) {
}
return signatureString.toString();
}
現在這個編碼字符串傳遞給 凡在.NET應用程序.NET應用程序建立一個簽名我使用的如果我從1024更改密鑰對的大小來獲得公鑰和簽名
protected RSAParameters GetPublicKey(string encodedString)
{
int bytesToSkip = encodedString.Substring((encodedString.Length - 10), 1).ToCharArray()[0] % 9;
int publicKeyStarts = bytesToSkip + encodedString.Substring((encodedString.Length - 2), 1).ToCharArray()[0] % 40;
string keyString = encodedString.Substring(publicKeyStarts, 176);
string modulusString = keyString.Substring(0, 172);
string exponentString = keyString.Substring(172);
RSAParameters publicKey = new RSAParameters();
publicKey.Modulus = new byte[128];
Array.Copy(System.Convert.FromBase64String(modulusString), 1, publicKey.Modulus, 0, 128);
publicKey.Exponent = System.Convert.FromBase64String(exponentString);
return publicKey;
}
protected byte[] GetSignature(string encodedString)
{
int bytesToSkip = encodedString.Substring((encodedString.Length - 10), 1).ToCharArray()[0] % 9;
int publicKeyStarts = bytesToSkip + encodedString.Substring((encodedString.Length - 2), 1).ToCharArray()[0] % 40;
String digSig = encodedString.Substring(0, publicKeyStarts - bytesToSkip) + encodedString.Substring(publicKeyStarts + 176);
return System.Convert.FromBase64String(digSig);
}
2048是什麼,我需要在我的.NET代碼
我找的答案是進行更改:從產生的RSA公共密鑰我如何能得到模數和指數的長度
你嘗試過什麼?你得到什麼結果是不正確的?什麼代碼行似乎是問題?你知道現有代碼的工作原理嗎? (它工作嗎?)這是一個真實的例子還是作業? – PhillipH