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POHow to verify that app was signed by my certificate?
 

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  1. POHow to verify that app was signed by my certificate?
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    <p>How do I check if the signature of my app matches the signature of the certificate that I used to sign it?</p> <p>This is how I should be able to get the certificates fingerprint:</p> <pre><code>public String getCertificateFingerprint() throws NameNotFoundException, CertificateException, NoSuchAlgorithmException { PackageManager pm = context.getPackageManager(); String packageName =context.getPackageName(); int flags = PackageManager.GET_SIGNATURES; PackageInfo packageInfo = null; packageInfo = pm.getPackageInfo(packageName, flags); Signature[] signatures = packageInfo.signatures; byte[] cert = signatures[0].toByteArray(); InputStream input = new ByteArrayInputStream(cert); CertificateFactory cf = null; cf = CertificateFactory.getInstance("X509"); X509Certificate c = null; c = (X509Certificate) cf.generateCertificate(input); MessageDigest md = MessageDigest.getInstance("MD5"); byte[] publicKey = md.digest(c.getPublicKey().getEncoded()); StringBuffer hexString = new StringBuffer(); for (int i = 0; i &lt; publicKey.length; i++) { String appendString = Integer.toHexString(0xFF &amp; publicKey[i]); if (appendString.length() == 1) hexString.append("0"); hexString.append(appendString); } return hexString.toString(); } </code></pre> <p>This is how I should be able to get the fingerprint of my certificate:</p> <pre><code>keytool -v -list -keystore filenameandpath </code></pre> <p>My problem is, that these two give back different results. Could someone point out what I'm screwing up?</p>
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