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Fallback to IvParameterSpec if GCMParameterSpec is not available

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This commit is contained in:
Cameron Gutman 2016-04-20 13:31:56 -04:00
parent 246fb69050
commit 248a135f86
1 changed files with 19 additions and 1 deletions
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20
moonlight-common/src/com/limelight/nvstream/input/ControllerStream.java
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@ -383,6 +383,23 @@ public class ControllerStream {
private static class AesGcmCipher implements InputCipher { private static class AesGcmCipher implements InputCipher {
private SecretKey key; private SecretKey key;
private byte[] iv; private byte[] iv;
private static boolean useGcmParameterSpec;
static {
try {
// GCMParameterSpec is a class specifically for initialize GCM ciphers. On some versions of
// Oracle's JVM, GCMParameterSpec is required to successfully initialize a GCM cipher,
// while other versions also support IvParameterSpec being used in GCM mode.
// On Android, GCMParameterSpec wasn't added until API 19, so we'll need to use IvParameterSpec
// on those versions. Android doesn't seem to care between IvParameterSpec and GCMParameterSpec on
// any version. To cover all of these cases, we'll use GCMParameterSpec if it's available in the
// class path, otherwise use IvParameterSpec.
Class.forName("javax.crypto.spec.GCMParameterSpec");
useGcmParameterSpec = true;
} catch (ClassNotFoundException e) {
useGcmParameterSpec = false;
}
}
public int getEncryptedSize(int plaintextSize) { public int getEncryptedSize(int plaintextSize) {
// GCM uses no padding + 16 bytes tag for message authentication // GCM uses no padding + 16 bytes tag for message authentication
@ -403,7 +420,8 @@ public class ControllerStream {
Cipher cipher; Cipher cipher;
try { try {
cipher = Cipher.getInstance("AES/GCM/NoPadding"); cipher = Cipher.getInstance("AES/GCM/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, key, new GCMParameterSpec(128, iv)); cipher.init(Cipher.ENCRYPT_MODE, key, useGcmParameterSpec ?
new GCMParameterSpec(128, iv) : new IvParameterSpec(iv));
// This is also non-ideal. Java gives us <ciphertext><tag> but we want to send <tag><ciphertext> // This is also non-ideal. Java gives us <ciphertext><tag> but we want to send <tag><ciphertext>
// so we'll take the output and arraycopy it into the right spot in the output buffer // so we'll take the output and arraycopy it into the right spot in the output buffer