/*
standard MessageDigest algorithms:
MD5
SHA-1
SHA-256
*/
private String getCertificateFingerprint(Context mContext, String algorithm, String packageName) {
PackageManager pm = mContext.getPackageManager();
int flags = PackageManager.GET_SIGNATURES;
PackageInfo packageInfo = null;
try {
packageInfo = pm.getPackageInfo(packageName, flags);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
if (packageInfo == null)
return null;
Signature[] signatures = packageInfo.signatures;
//此处我直接默认只有一个签名
byte[] cert = signatures[0].toByteArray();
InputStream input = new ByteArrayInputStream(cert);
CertificateFactory cf = null;
try {
cf = CertificateFactory.getInstance("X509");
} catch (CertificateException e) {
e.printStackTrace();
}
if (cf == null)
return null;
X509Certificate c = null;
try {
c = (X509Certificate) cf.generateCertificate(input);
} catch (CertificateException e) {
e.printStackTrace();
}
if (c==null)
return null;
String hexString = null;
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
byte[] publicKey = md.digest(c.getEncoded());
hexString = byte2HexFormatted(publicKey);
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace();
} catch (CertificateEncodingException e) {
e.printStackTrace();
}
return hexString;
}
public static String byte2HexFormatted(byte[] arr) {
StringBuilder str = new StringBuilder(arr.length * 2);
for (int i = 0; i < arr.length; i++) {
String h = Integer.toHexString(arr[i]);
int l = h.length();
if (l == 1) h = "0" + h;
if (l > 2) h = h.substring(l - 2, l);
str.append(h.toUpperCase());
if (i < (arr.length - 1)) str.append(':');
}
return str.toString();
}
standard MessageDigest algorithms:
MD5
SHA-1
SHA-256
*/
private String getCertificateFingerprint(Context mContext, String algorithm, String packageName) {
PackageManager pm = mContext.getPackageManager();
int flags = PackageManager.GET_SIGNATURES;
PackageInfo packageInfo = null;
try {
packageInfo = pm.getPackageInfo(packageName, flags);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
if (packageInfo == null)
return null;
Signature[] signatures = packageInfo.signatures;
//此处我直接默认只有一个签名
byte[] cert = signatures[0].toByteArray();
InputStream input = new ByteArrayInputStream(cert);
CertificateFactory cf = null;
try {
cf = CertificateFactory.getInstance("X509");
} catch (CertificateException e) {
e.printStackTrace();
}
if (cf == null)
return null;
X509Certificate c = null;
try {
c = (X509Certificate) cf.generateCertificate(input);
} catch (CertificateException e) {
e.printStackTrace();
}
if (c==null)
return null;
String hexString = null;
try {
MessageDigest md = MessageDigest.getInstance(algorithm);
byte[] publicKey = md.digest(c.getEncoded());
hexString = byte2HexFormatted(publicKey);
} catch (NoSuchAlgorithmException e1) {
e1.printStackTrace();
} catch (CertificateEncodingException e) {
e.printStackTrace();
}
return hexString;
}
public static String byte2HexFormatted(byte[] arr) {
StringBuilder str = new StringBuilder(arr.length * 2);
for (int i = 0; i < arr.length; i++) {
String h = Integer.toHexString(arr[i]);
int l = h.length();
if (l == 1) h = "0" + h;
if (l > 2) h = h.substring(l - 2, l);
str.append(h.toUpperCase());
if (i < (arr.length - 1)) str.append(':');
}
return str.toString();
}
