From 12ac04231b8d358e70c830f7958f7efbc0f7c0d1 Mon Sep 17 00:00:00 2001
From: James Cook <james@lindenlab.com>
Date: Thu, 15 Feb 2007 20:24:08 +0000
Subject: merge -r 57761:57967 im-email-session-3, removes database load from
 IM to email session tracking, introduces new format for email return
 addresses

---
 indra/llmessage/llblowfishcipher.cpp | 135 +++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 indra/llmessage/llblowfishcipher.cpp

(limited to 'indra/llmessage/llblowfishcipher.cpp')

diff --git a/indra/llmessage/llblowfishcipher.cpp b/indra/llmessage/llblowfishcipher.cpp
new file mode 100644
index 0000000000..0255a654df
--- /dev/null
+++ b/indra/llmessage/llblowfishcipher.cpp
@@ -0,0 +1,135 @@
+/** 
+ * @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-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#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
+
-- 
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