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Code Issues Releases Wiki Activity

Crypto: Only create random generator as needed.

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This commit is contained in:
Tom Hacohen 2017-03-29 12:02:13 +01:00
parent 93f757be3e
commit 225d01c143
1 changed files with 9 additions and 3 deletions
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12
app/src/main/java/com/etesync/syncadapter/journalmanager/Helpers.java
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@ -47,10 +47,9 @@ public class Helpers {
} }
static class Cipher { static class Cipher {
SecureRandom random; private SecureRandom _random = null;
Cipher() { Cipher() {
random = new SecureRandom();
} }
private static final int blockSize = 16; // AES's block size in bytes private static final int blockSize = 16; // AES's block size in bytes
@ -94,7 +93,7 @@ public class Helpers {
byte[] encrypt(String keyBase64, byte[] data) { byte[] encrypt(String keyBase64, byte[] data) {
byte[] iv = new byte[blockSize]; byte[] iv = new byte[blockSize];
random.nextBytes(iv); getRandom().nextBytes(iv);
BufferedBlockCipher cipher = getCipher(keyBase64, iv, true); BufferedBlockCipher cipher = getCipher(keyBase64, iv, true);
@ -111,6 +110,13 @@ public class Helpers {
return buf; return buf;
} }
private SecureRandom getRandom() {
if (_random == null) {
_random = new SecureRandom();
}
return _random;
}
} }
static String sha256(String base) { static String sha256(String base) {