From 242d678aeed0b806a30553be0fa87189b7478450 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Fri, 19 Jun 2015 01:39:02 +0300
Subject: OFB/CTR decryption is the same as encryption

---
 src/box.c | 39 ++-------------------------------------
 1 file changed, 2 insertions(+), 37 deletions(-)

(limited to 'src')

diff --git a/src/box.c b/src/box.c
index c74100c..d10e963 100644
--- a/src/box.c
+++ b/src/box.c
@@ -234,41 +234,6 @@ static AesNI_StatusCode aesni_box_decrypt_cfb(
     return status;
 }
 
-static AesNI_StatusCode aesni_box_decrypt_ofb(
-    AesNI_Box* box,
-    const AesNI_BoxBlock* input,
-    AesNI_BoxBlock* output,
-    AesNI_ErrorDetails* err_details)
-{
-    AesNI_StatusCode status = box->algorithm_iface->encrypt(
-        &box->iv,
-        &box->encrypt_params,
-        output,
-        err_details);
-    if (aesni_is_error(status))
-        return status;
-
-    box->iv = *output;
-
-    status = box->algorithm_iface->xor_block(
-        output,
-        input,
-        err_details);
-    if (aesni_is_error(status))
-        return status;
-
-    return status;
-}
-
-static AesNI_StatusCode aesni_box_decrypt_ctr(
-    AesNI_Box* box,
-    const AesNI_BoxBlock* input,
-    AesNI_BoxBlock* output,
-    AesNI_ErrorDetails* err_details)
-{
-    return aesni_box_encrypt_ctr(box, input, output, err_details);
-}
-
 typedef AesNI_BoxEncryptMode AesNI_BoxDecryptMode;
 
 static AesNI_BoxDecryptMode aesni_box_decrypt_mode[] =
@@ -276,8 +241,8 @@ static AesNI_BoxDecryptMode aesni_box_decrypt_mode[] =
     &aesni_box_decrypt_ecb,
     &aesni_box_decrypt_cbc,
     &aesni_box_decrypt_cfb,
-    &aesni_box_decrypt_ofb,
-    &aesni_box_decrypt_ctr,
+    &aesni_box_encrypt_ofb,
+    &aesni_box_encrypt_ctr,
 };
 
 AesNI_StatusCode aesni_box_decrypt(
-- 
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