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QuestionRead signature data from APK's RSA signature file Pin
mynametaken30-Dec-21 4:46
Membermynametaken30-Dec-21 4:46 
I have the source in java that reads signature data from RSA (erxtracted from APK (Android Package) file) and it works flawlessly but i would like to convert to C# in order to use in my c# application. The issue is i'm getting different data from GetRawCertData() no matter what I have tried.

This is the result:
C#: AQAAADCCBYkwggNxoAMCAQICFQDmX5cziG0zO22ity1a/dKI6FnZyzANBgk...
Java: AQAABY0wggWJMIIDcaADAgECAhUA5l+XM4htMzttorctWv3SiOhZ2cswDQYJKoZIhvcNA...

I'm not familar with signatures, and i'm not even sure what excat format is it but I know it is signed with Java's KeyStore file.

What should I do to get it right? it is very close though. Executing .jar file would be a workaround but I would like to avoid executing something externally

This is my C# code
C#
X509Certificate cert = X509Certificate.CreateFromSignedFile("BNDLTOOL.RSA");

MemoryStream ms = new MemoryStream();
BinaryWriter bw = new BinaryWriter(ms);
bw.Write(1);

byte[] data = cert.GetRawCertData();
bw.Write(data);
bw.Write(data.Length);

byte[] buffer = ms.ToArray();

Debug.WriteLine(Convert.ToBase64String(buffer));


This is Java code from a project that I found online
Java
PKCS7 pkcs7 = new PKCS7(StreamUtil.readBytes(zipFile.getInputStream(ze)));
Certificate[] certs = pkcs7.getCertificates();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
dos.write(certs.length);
for (int i = 0; i < certs.length; i++) {
    byte[] data = certs[i].getEncoded();
    System.out.printf("  --SignatureHash[%d]: %08x\n", i, Arrays.hashCode(data));
    dos.writeInt(data.length);
    dos.write(data);
}
byte[] signatures = baos.toByteArray();
System.out.println(Base64.getEncoder().encodeToString(signatures));


modified 1-Jan-22 11:52am.

AnswerRe: Read signature data from APK's RSA signature file Pin
jschell30-Dec-21 7:35
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GeneralRe: Read signature data from APK's RSA signature file Pin
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AnswerRe: Read signature data from APK's RSA signature file Pin
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GeneralRe: Read signature data from APK's RSA signature file Pin
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GeneralRe: Read signature data from APK's RSA signature file Pin
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GeneralRe: Read signature data from APK's RSA signature file Pin
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AnswerRe: Read signature data from APK's RSA signature file Pin
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