1 files changed, 38 insertions, 0 deletions
diff --git a/indra/llmessage/llcipher.h b/indra/llmessage/llcipher.h
new file mode 100644
index 0000000000..3dce949c2e
--- /dev/null
+++ b/indra/llmessage/llcipher.h
@@ -0,0 +1,38 @@
+/** 
+ * @file llcipher.h
+ * @brief Abstract base class for encryption ciphers.
+ *
+ * Copyright (c) 2003-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LLCIPHER_H
+#define LLCIPHER_H
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Class LLCipher
+//
+// Abstract base class for a cipher object.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+class LLCipher
+{
+public:
+	virtual ~LLCipher() {}
+
+	// encrypt src and place result into dst. returns TRUE if
+	// Returns number of bytes written into dst, or 0 on error.
+	virtual U32 encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
+
+	// decrypt src and place result into dst. 
+	// Returns number of bytes written into dst, or 0 on error.
+	virtual U32 decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len) = 0;
+
+	// returns the minimum amount of space required to encrypt for a 
+	// unencrypted source buffer of length len.
+	// *NOTE: This is estimated space and you should check the return value
+	// of the encrypt function.
+	virtual U32 requiredEncryptionSpace(U32 src_len) const = 0 ;
+};
+
+#endif