Use the libgcrypt SALSA20 cipher if available.

src/crypto/SymmetricCipherGcrypt.cpp

@@ -17,6 +17,7 @@
 
 #include "SymmetricCipherGcrypt.h"
 
+#include "config-keepassx.h"
 #include "crypto/Crypto.h"
 
 SymmetricCipherGcrypt::SymmetricCipherGcrypt(SymmetricCipher::Algorithm algo, SymmetricCipher::Mode mode,
@@ -43,6 +44,11 @@ int SymmetricCipherGcrypt::gcryptAlgo(SymmetricCipher::Algorithm algo)
     case SymmetricCipher::Twofish:
         return GCRY_CIPHER_TWOFISH;
 
+#ifdef GCRYPT_HAS_SALSA20
+    case SymmetricCipher::Salsa20:
+        return GCRY_CIPHER_SALSA20;
+#endif
+
     default:
         Q_ASSERT(false);
         return -1;
@@ -58,6 +64,9 @@ int SymmetricCipherGcrypt::gcryptMode(SymmetricCipher::Mode mode)
     case SymmetricCipher::Cbc:
         return GCRY_CIPHER_MODE_CBC;
 
+    case SymmetricCipher::Stream:
+        return GCRY_CIPHER_MODE_STREAM;
+
     default:
         Q_ASSERT(false);
         return -1;