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Crypto: Consolidate duplicate unlimited strength crypto check code

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zzz
2015-10-17 12:55:39 +00:00
parent 70921a2b09
commit 3411a7c884
3 changed files with 50 additions and 45 deletions
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23
core/java/src/net/i2p/crypto/CryptixAESEngine.java
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@@ -44,28 +44,7 @@ public class CryptixAESEngine extends AESEngine {
/** see test results below */
private static final int MIN_SYSTEM_AES_LENGTH = 704;
private static final boolean USE_SYSTEM_AES;
static {
boolean systemOK = false;
if (hasAESNI()) {
try {
systemOK = Cipher.getMaxAllowedKeyLength("AES") >= 256;
} catch (GeneralSecurityException gse) {
// a NoSuchAlgorithmException
} catch (NoSuchMethodError nsme) {
// JamVM, gij
try {
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
SecretKeySpec key = new SecretKeySpec(new byte[32], "AES");
cipher.init(Cipher.ENCRYPT_MODE, key);
systemOK = true;
} catch (GeneralSecurityException gse) {
}
}
}
USE_SYSTEM_AES = systemOK;
//System.out.println("Using system AES? " + systemOK);
}
private static final boolean USE_SYSTEM_AES = hasAESNI() && CryptoCheck.isUnlimited();
/**
* Do we have AES-NI support in the processor and JVM?

47
core/java/src/net/i2p/crypto/CryptoCheck.java Normal file
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@@ -0,0 +1,47 @@
package net.i2p.crypto;
import java.security.GeneralSecurityException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
* Moved from CryptixAESEngine and net.i2p.router.tasks.CryptoChecker
*
* @since 0.9.23
*/
public class CryptoCheck {
private static final boolean _isUnlimited;
static {
boolean unlimited = false;
try {
unlimited = Cipher.getMaxAllowedKeyLength("AES") >= 256;
} catch (GeneralSecurityException gse) {
// a NoSuchAlgorithmException
} catch (NoSuchMethodError nsme) {
// JamVM, gij
try {
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
SecretKeySpec key = new SecretKeySpec(new byte[32], "AES");
cipher.init(Cipher.ENCRYPT_MODE, key);
unlimited = true;
} catch (GeneralSecurityException gse) {
}
}
_isUnlimited = unlimited;
}
private CryptoCheck() {}
/**
* Do we have unlimited crypto?
*/
public static boolean isUnlimited() {
return _isUnlimited;
}
public static void main(String args[]) {
System.out.println("Unlimited? " + isUnlimited());
}
}