Android Utililty Methods AES Key Get

List of utility methods to do AES Key Get

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Description

The list of methods to do AES Key Get are organized into topic(s).

Method

SecretKeySpeccreateKey(String password)
create Key 
byte[] data = null;
if (password == null) {
    password = "";
StringBuffer sb = new StringBuffer(32);
sb.append(password);
while (sb.length() < 32) {
    sb.append("0");
...
byte[]getKeyBytes(String key)
convert key from string to 256-bits (32-bytes) bytes 
MessageDigest md5 = MessageDigest.getInstance("md5");
byte[] k1 = md5.digest(key.substring(0, key.length() / 2)
        .getBytes());
byte[] k2 = md5.digest(key.substring(key.length() / 2).getBytes());
byte[] k = new byte[32];
for (int i = 0; i < 16; i++) {
    k[i] = k1[i];
    k[16 + i] = k2[i];
...
byte[]getRawKey(String key)
get Raw Key 
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(key.getBytes());
kgen.init(256, sr);
SecretKey skey = kgen.generateKey();
return skey.getEncoded();
byte[]getRawKey(byte[] seed)
get Raw Key 
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr); 
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
byte[]getRawKey(byte[] seed)
get Raw Key 
KeyGenerator kgen = KeyGenerator.getInstance("AES"); 
SecureRandom sr = null;
if (android.os.Build.VERSION.SDK_INT >= JELLY_BEAN_4_2) {
    sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
} else {
    sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
...
byte[]getRawKey(byte[] seed)
get Raw Key 
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
byte[]getRawKey(byte[] seed)
get Raw Key 
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = null;
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
} else if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
    sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
} else {
    sr = SecureRandom.getInstance("SHA1PRNG");
...
byte[]getRawKey(byte[] seed)
get Raw Key 
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey sKey = kgen.generateKey();
byte[] raw = sKey.getEncoded();
return raw;
byte[]getRawKey(byte[] seed)
To get a raw key. 
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey sKey = kgen.generateKey();
byte[] raw = sKey.getEncoded();
return raw;
SecretKeySpecgetSecretKey(String key)
get Secret Key 
MessageDigest digest;
try {
    digest = MessageDigest.getInstance("md5");
    SecretKeySpec keySpec = new SecretKeySpec(digest.digest(key
            .getBytes(UTF_8)), "AES");
    return keySpec;
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
...