Android 指纹解锁和MD5加密密码

指纹解锁

KeyguardManager keyguardManager = getSystemService(KeyguardManager.class);
if (!keyguardManager.isKeyguardSecure()) {
// Show a message that the user hasn't set up a fingerprint or lock screen.
Toast.makeText(this, getResources().getString(R.string.not_set_secure_lock),
Toast.LENGTH_LONG).show();
purchaseButton.setEnabled(false);
purchaseButtonNotInvalidated.setEnabled(false);
return;
}

FingerprintManager fingerprintManager = getSystemService(FingerprintManager.class);
if (!fingerprintManager.hasEnrolledFingerprints()) {
purchaseButton.setEnabled(false);
// This happens when no fingerprints are registered.
Toast.makeText(this, getResources().getString(R.string.no_fingerprint_register),
Toast.LENGTH_LONG).show();
return;
}

private class PurchaseButtonClickListener implements View.OnClickListener {

Cipher cipher;
String mKeyName;

PurchaseButtonClickListener(Cipher cipher, String keyName) {
this.cipher = cipher;
mKeyName = keyName;
}

@Override
public void onClick(View view) {
findViewById(R.id.confirmation_message).setVisibility(View.GONE);
findViewById(R.id.encrypted_message).setVisibility(View.GONE);

// Set up the crypto object for later. The object will be authenticated by use
// of the fingerprint.
if (initCipher(cipher, mKeyName)) {
// Show the fingerprint dialog. The user has the option to use the fingerprint with
// crypto, or you can fall back to using a server-side verified password.
FingerprintAuthenticationDialogFragment fragment
= new FingerprintAuthenticationDialogFragment();
fragment.setCryptoObject(new FingerprintManager.CryptoObject(cipher));
boolean useFingerprintPreference = sharedPreferences
.getBoolean(getString(R.string.use_fingerprint_to_authenticate_key),
true);
if (useFingerprintPreference) {
fragment.setStage(FingerprintAuthenticationDialogFragment.Stage.FINGERPRINT);
} else {
fragment.setStage(FingerprintAuthenticationDialogFragment.Stage.PASSWORD);
}
fragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
} else {
// This happens if the lock screen has been disabled or or a fingerprint got
// enrolled. Thus show the dialog to authenticate with their password first
// and ask the user if they want to authenticate with fingerprints in the
// future
FingerprintAuthenticationDialogFragment fragment
= new FingerprintAuthenticationDialogFragment();
fragment.setCryptoObject(new FingerprintManager.CryptoObject(cipher));
fragment.setStage(
FingerprintAuthenticationDialogFragment.Stage.NEW_FINGERPRINT_ENROLLED);
fragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
}
}
}

MD5加密

/**
* 计算文件的 MD5 值
*
* @param file
* @return
*/
public static String getFileMD5(File file) {
if (file == null || !file.isFile() || !file.exists()) {
return "";
}
FileInputStream in = null;
String result = "";
byte buffer[] = new byte[8192];
int len;
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
in = new FileInputStream(file);
while ((len = in.read(buffer)) != -1) {
md5.update(buffer, 0, len);
}
byte[] bytes = md5.digest();

for (byte b : bytes) {
String temp = Integer.toHexString(b & 0xff);
if (temp.length() == 1) {
temp = "0" + temp;
}
result += temp;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != in) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}

/**
* 计算字符串MD5值
*
* @param string
* @return
*/
public static String getStringMD5(String string) {
if (TextUtils.isEmpty(string)) {
return "";
}
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
byte[] bytes = md5.digest(string.getBytes());
String result = "";
for (byte b : bytes) {
String temp = Integer.toHexString(b & 0xff);
if (temp.length() == 1) {
temp = "0" + temp;
}
result += temp;
}
return result;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}

/**
* 对字符串多次MD5加密
*
* @param string
* @param times
* @return
*/
public static String getStringMD5MultiTimes(String string, int times) {
if (TextUtils.isEmpty(string)) {
return "";
}
String md5 = getStringMD5(string);
for (int i = 0; i < times - 1; i++) {
md5 = getStringMD5(md5);
}
return getStringMD5(md5);
}

/**
* MD5加盐
*
* @param string
* @param salt
* @return
*/
public static String getMD5ByStringAndSalt(String string, String salt) {
if (TextUtils.isEmpty(string)) {
return "";
}
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
byte[] bytes = md5.digest((string + salt).getBytes());
String result = "";
for (byte b : bytes) {
String temp = Integer.toHexString(b & 0xff);
if (temp.length() == 1) {
temp = "0" + temp;
}
result += temp;
}
return result;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}

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