From d4ed0c56ec47f93a118aa2ebd6aad00ef45024a8 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Sun, 22 Jun 2014 22:36:12 +0000
Subject: implemented cipher using nettle (not tested yet)

---
 src/cipher.cpp | 28 +++++++++++++++++++++-------
 src/cipher.h   |  3 +--
 2 files changed, 22 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/cipher.cpp b/src/cipher.cpp
index c05f249..c5d015a 100644
--- a/src/cipher.cpp
+++ b/src/cipher.cpp
@@ -39,6 +39,10 @@
 #include "endian.h"
 
 #include "cipher.h"
+#if defined(USE_NETTLE)
+#include <nettle/ctr.h>
+#endif
+
 #include "log.h"
 #include "anytunError.h"
 
@@ -87,7 +91,11 @@ AesIcmCipher::AesIcmCipher(kd_dir_t d, uint16_t key_length) : Cipher(d), key_(ui
 
 void AesIcmCipher::init(uint16_t key_length)
 {
-#if defined(USE_GCRYPT)
+#if defined(USE_SSL_CRYPTO)
+    // nothing here
+#elif defined(USE_NETTLE)
+    // nothing here
+#else  // USE_GCRYPT is the default
   handle_ = NULL;
   int algo;
   switch(key_length) {
@@ -116,7 +124,11 @@ void AesIcmCipher::init(uint16_t key_length)
 
 AesIcmCipher::~AesIcmCipher()
 {
-#if defined(USE_GCRYPT)
+#if defined(USE_SSL_CRYPTO)
+    // nothing here
+#elif defined(USE_NETTLE)
+    // nothing here
+#else  // USE_GCRYPT is the default
   if(handle_) {
     gcry_cipher_close(handle_);
   }
@@ -164,8 +176,7 @@ void AesIcmCipher::calc(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t*
     return;
   }
 #elif defined(USE_NETTLE)
-      // TODO: nettle
-
+  aes_set_encrypt_key(&ctx_, key_.getLength(), key_.getBuf());
 #else  // USE_GCRYPT is the default
   gcry_error_t err = gcry_cipher_setkey(handle_, key_.getBuf(), key_.getLength());
   if(err) {
@@ -178,15 +189,18 @@ void AesIcmCipher::calc(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t*
 
 #if defined(USE_SSL_CRYPTO)
   if(CTR_LENGTH != AES_BLOCK_SIZE) {
-    cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher CTR: size don't fits";
+    cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher CTR: size doesn't fit";
     return;
   }
   unsigned int num = 0;
   std::memset(ecount_buf_, 0, AES_BLOCK_SIZE);
   AES_ctr128_encrypt(in, out, (ilen < olen) ? ilen : olen, &aes_key_, ctr_.buf_, ecount_buf_, &num);
 #elif defined(USE_NETTLE)
-      // TODO: nettle
-
+  if(CTR_LENGTH != AES_BLOCK_SIZE) {
+    cLog.msg(Log::PRIO_ERROR) << "AesIcmCipher: Failed to set cipher CTR: size doesn't fit";
+    return;
+  }
+  ctr_crypt(&ctx_, (nettle_crypt_func *)(aes_encrypt), AES_BLOCK_SIZE, ctr_.buf_, (ilen < olen) ? ilen : olen, out, in);
 #else  // USE_GCRYPT is the default
   err = gcry_cipher_setctr(handle_, ctr_.buf_, CTR_LENGTH);
   if(err) {
diff --git a/src/cipher.h b/src/cipher.h
index a9ce59b..0eca1b5 100644
--- a/src/cipher.h
+++ b/src/cipher.h
@@ -104,8 +104,7 @@ private:
   AES_KEY aes_key_;
   uint8_t ecount_buf_[AES_BLOCK_SIZE];
 #elif defined(USE_NETTLE)
-      // TODO: nettle
-
+  struct aes_ctx ctx_;
 #else  // USE_GCRYPT is the default
   gcry_cipher_hd_t handle_;
 #endif
-- 
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