From 52d4dfefeb9704c5f5055b4f52b56c2649112308 Mon Sep 17 00:00:00 2001
From: Erwin Nindl <nine@wirdorange.org>
Date: Fri, 17 Aug 2007 09:44:33 +0000
Subject: changed keyderivation fuction from 'aes_icm_output' to
 'cipher_output'

---
 cypher.cpp        |  3 ++-
 keyDerivation.cpp | 28 +++++++++++++---------------
 keyDerivation.h   |  7 ++++---
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/cypher.cpp b/cypher.cpp
index ad590fa..0e48ae7 100644
--- a/cypher.cpp
+++ b/cypher.cpp
@@ -72,7 +72,8 @@ void AesIcmCypher::cypher(Buffer& buf, seq_nr_t seq_nr, sender_id_t sender_id)
   uint8_t key[] = {
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-    0x10, 0x11, 0x12, 0x13
+    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d
   };
 
   v128_t iv;
diff --git a/keyDerivation.cpp b/keyDerivation.cpp
index 5663ac1..d6b1ca3 100644
--- a/keyDerivation.cpp
+++ b/keyDerivation.cpp
@@ -37,11 +37,18 @@ extern "C" {
 
 err_status_t KeyDerivation::init(const uint8_t key[30], const uint8_t salt[14])
 {
-  aes_icm_context_init(&kdf_, key);
+  extern cipher_type_t aes_icm;
+  err_status_t status = err_status_ok;
 
   for(uint8_t i = 0; i < 14; i++)
     salt_[i] = salt[i];
 
+  // allocate cipher
+  status = cipher_type_alloc(&aes_icm, &cipher_, 30);
+
+  // init cipher
+  status = cipher_init(cipher_, key, direction_any);   
+
   return err_status_ok;
 }
 
@@ -56,8 +63,9 @@ err_status_t KeyDerivation::setLogKDRate(const uint8_t log_rate)
 }
 
 
-err_status_t KeyDerivation::generate(satp_prf_label label, seq_nr_t seq_nr, uint8_t *key, int length)
+err_status_t KeyDerivation::generate(satp_prf_label label, seq_nr_t seq_nr, uint8_t *key, uint32_t length)
 {
+  err_status_t status = err_status_ok;
   v128_t iv, salt, key_id;
   uint8_t r = 0;
 
@@ -78,10 +86,10 @@ err_status_t KeyDerivation::generate(satp_prf_label label, seq_nr_t seq_nr, uint
   v128_copy_octet_string(&salt, salt_);
   v128_xor(&iv, &salt, &key_id);
 
-  aes_icm_set_iv(&kdf_, &iv);
+  status = cipher_set_iv(cipher_, &iv);
 
   /* generate keystream output */
-  aes_icm_output(&kdf_, key, length);
+  status = cipher_output(cipher_, key, length);
 
   return err_status_ok;
 }
@@ -89,17 +97,7 @@ err_status_t KeyDerivation::generate(satp_prf_label label, seq_nr_t seq_nr, uint
 
 err_status_t KeyDerivation::clear() 
 {
-  /* zeroize aes context */
-
-  v128_set_to_zero(&kdf_.counter);
-  v128_set_to_zero(&kdf_.offset);
-  v128_set_to_zero(&kdf_.keystream_buffer);
-  for(uint8_t i = 0; i < 11; i++)
-  {
-    v128_set_to_zero(&kdf_.expanded_key[i]);
-  }
-  kdf_.bytes_in_buffer = 0;
-
+  cipher_dealloc(cipher_);
   return err_status_ok;
 }
 
diff --git a/keyDerivation.h b/keyDerivation.h
index a625342..9033d30 100644
--- a/keyDerivation.h
+++ b/keyDerivation.h
@@ -49,18 +49,19 @@ typedef enum {
 class KeyDerivation
 {
 public:
-  KeyDerivation() : ld_kdr_(-1) {};
+  KeyDerivation() : ld_kdr_(-1), cipher_(NULL) {};
   virtual ~KeyDerivation() {};
 
   err_status_t init(const uint8_t key[30], const uint8_t salt[14]);
   err_status_t setLogKDRate(const uint8_t ld_rate);
-  err_status_t generate(satp_prf_label label, seq_nr_t seq_nr, uint8_t *key, int length);
+  err_status_t generate(satp_prf_label label, seq_nr_t seq_nr, uint8_t *key, uint32_t length);
   err_status_t clear();
 
 protected:
-  aes_icm_ctx_t kdf_;
   int8_t ld_kdr_;     // ld(key_derivation_rate)
   uint8_t salt_[14];
+
+  cipher_t* cipher_;
 };
 
 #endif
-- 
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