1 files changed, 154 insertions, 0 deletions

diff --git a/linden/indra/llmessage/llblowfishcipher.cpp b/linden/indra/llmessage/llblowfishcipher.cpp
new file mode 100644
index 0000000..f9a68ab
--- /dev/null
+++ b/linden/indra/llmessage/llblowfishcipher.cpp
@@ -0,0 +1,154 @@
+/** 
+ * @file llblowcipher.cpp
+ * @brief Wrapper around OpenSSL Blowfish encryption algorithm.
+ *
+ * We do not have OpenSSL headers or libraries on Windows, so this
+ * class only works on Linux.
+ *
+ * Copyright (c) 2007-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#include "linden_common.h"
+
+#include "llblowfishcipher.h"
+
+
+LLBlowfishCipher::LLBlowfishCipher(const U8* secret, size_t secret_size)
+:       LLCipher()
+{
+        llassert(secret);
+
+        mSecretSize = secret_size;
+        mSecret = new U8[mSecretSize];
+        memcpy(mSecret, secret, mSecretSize);
+}
+
+LLBlowfishCipher::~LLBlowfishCipher()
+{
+        delete [] mSecret;
+        mSecret = NULL;
+}
+
+
+#if LL_LINUX
+
+#include <openssl/evp.h>
+
+// virtual
+U32 LLBlowfishCipher::encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len)
+{
+        if (!src || !src_len || !dst || !dst_len) return 0;
+        if (src_len > dst_len) return 0;
+
+        // OpenSSL uses "cipher contexts" to hold encryption parameters.
+    EVP_CIPHER_CTX context;
+    EVP_CIPHER_CTX_init(&context);
+
+        // We want a blowfish cyclic block chain cipher, but need to set 
+        // the key length before we pass in a key, so call EncryptInit 
+        // first with NULLs.
+        EVP_EncryptInit_ex(&context, EVP_bf_cbc(), NULL, NULL, NULL);
+        EVP_CIPHER_CTX_set_key_length(&context, (int)mSecretSize);
+        
+        // Complete initialization.  Per EVP_EncryptInit man page, the
+        // cipher pointer must be NULL.  Apparently initial_vector must
+        // be 8 bytes for blowfish, as this is the block size.
+    unsigned char initial_vector[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+        EVP_EncryptInit_ex(&context, NULL, NULL, mSecret, initial_vector);
+
+    int blocksize = EVP_CIPHER_CTX_block_size(&context);
+    int keylen = EVP_CIPHER_CTX_key_length(&context);
+    int iv_length = EVP_CIPHER_CTX_iv_length(&context);
+    lldebugs << "LLBlowfishCipher blocksize " << blocksize
+                << " keylen " << keylen
+                << " iv_len " << iv_length
+                << llendl;
+
+    int output_len = 0;
+    if (!EVP_EncryptUpdate(&context,
+                dst,
+                &output_len,
+                src,
+                src_len))
+    {
+        llwarns << "LLBlowfishCipher::encrypt EVP_EncryptUpdate failure" << llendl;
+        return 0;
+    }
+
+        // There may be some final data left to encrypt if the input is
+        // not an exact multiple of the block size.
+    int temp_len = 0;
+    if (!EVP_EncryptFinal_ex(&context, (unsigned char*)(dst + output_len), &temp_len))
+    {
+        llwarns << "LLBlowfishCipher::encrypt EVP_EncryptFinal failure" << llendl;
+        return 0;
+    }
+    output_len += temp_len;
+        return output_len;
+}
+
+// virtual
+U32 LLBlowfishCipher::decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len)
+{
+        llerrs << "LLBlowfishCipher decrypt unsupported" << llendl;
+        return 0;
+}
+
+// virtual
+U32 LLBlowfishCipher::requiredEncryptionSpace(U32 len) const
+{
+        // *HACK: We know blowfish uses an 8 byte block size.
+        // Oddly, sometimes EVP_Encrypt produces an extra block
+        // if the input is an exact multiple of the block size.
+        // So round up.
+        const U32 BLOCK_SIZE = 8;
+        len += BLOCK_SIZE;
+        len -= (len % BLOCK_SIZE);
+        return len;
+}
+
+#else   // !LL_LINUX
+
+// virtual
+U32 LLBlowfishCipher::encrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len)
+{
+        llerrs << "LLBlowfishCipher only supported on Linux" << llendl;
+        return 0;
+}
+
+// virtual
+U32 LLBlowfishCipher::decrypt(const U8* src, U32 src_len, U8* dst, U32 dst_len)
+{
+        llerrs << "LLBlowfishCipher only supported on Linux" << llendl;
+        return 0;
+}
+
+// virtual
+U32 LLBlowfishCipher::requiredEncryptionSpace(U32 len) const
+{
+        llerrs << "LLBlowfishCipher only supported on Linux" << llendl;
+        return 0;
+}
+
+#endif
+