android 获取apk md5值
1， 获取 Signature
2. 根据Signature计算md5和sha1信息，获取签名公钥信息
TextView text = null;
StringBuffer sb = new StringBuffer();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text = (TextView) findViewById(R.id.text);
try {
PackageInfo pi = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
Signature signatures = pi.signatures[0];
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(signatures.toByteArray());
byte[] digest = md.digest();
String res = toHexString(digest);
Log.e(TAG, "apk md5 = "+res);
sb.append("apk md5 = "+res);
MessageDigest md2 = MessageDigest.getInstance("SHA1");
md2.update(signatures.toByteArray());
byte[] digest2 = md.digest();
String res2 = toHexString(digest2);
Log.e(TAG, "apk SHA1 = "+res2);
sb.append("\napk SHA1 = "+res2);
ByteArrayInputStream bais = new ByteArrayInputStream(signatures.toByteArray());
CertificateFactory cf = CertificateFactory.getInstance("X.509");
X509Certificate cert = (X509Certificate)cf.generateCertificate(bais);
String sigAlgName = cert.getSigAlgName();
String subjectDN = cert.getSubjectDN().toString();
Log.e(TAG, "sigAlgName = "+sigAlgName);
Log.e(TAG, "subjectDN = "+subjectDN);
sb.append("\n sigAlgName = "+sigAlgName);
sb.append("\n subjectDN = "+subjectDN);
bais.close();
} catch (NameNotFoundException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (CertificateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
text.setText(sb.toString());
}
private void byte2hex(byte b, StringBuffer buf) {
char[] hexChars = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘,
‘9‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘ };
int high = ((b & 0xf0) >> 4);
int low = (b & 0x0f);
buf.append(hexChars[high]);
buf.append(hexChars[low]);
}
/*
* Converts a byte array to hex string
*/
private String toHexString(byte[] block) {
StringBuffer buf = new StringBuffer();
int len = block.length;
for (int i = 0; i < len; i++) {
byte2hex(block[i], buf);
if (i < len-1) {
buf.append(":");
}
}
return buf.toString();
}
原文：http://blog.csdn.net/qq1761310972/article/details/44540955