From 21b736e980709dad61c1412e22ec26265bfe4f0e Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Thu, 4 Jun 2015 03:18:34 +0300
Subject: add CTR mode

---
 include/aesni/api.h | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

(limited to 'include')

diff --git a/include/aesni/api.h b/include/aesni/api.h
index fff3672..3318aef 100644
--- a/include/aesni/api.h
+++ b/include/aesni/api.h
@@ -105,6 +105,30 @@ static __inline AesBlock128 __fastcall aes128ofb_decrypt(
     return _mm_xor_si128(tmp, cypher);
 }
 
+static __inline AesBlock128 __fastcall aes128ctr_encrypt(
+    AesBlock128 plain,
+    Aes128KeySchedule* key_schedule,
+    AesBlock128 init_vector,
+    int counter)
+{
+    init_vector = aes128_le2be(init_vector);
+    init_vector = _mm_add_epi32(init_vector, make_aes_block128(0, 0, 0, counter));
+    init_vector = aes128_be2le(init_vector);
+    return _mm_xor_si128(plain, raw_aes128ecb_encrypt(init_vector, key_schedule));
+}
+
+static __inline AesBlock128 __fastcall aes128ctr_decrypt(
+    AesBlock128 cypher,
+    Aes128KeySchedule* key_schedule,
+    AesBlock128 init_vector,
+    int counter)
+{
+    init_vector = aes128_le2be(init_vector);
+    init_vector = _mm_add_epi32(init_vector, make_aes_block128(0, 0, 0, counter));
+    init_vector = aes128_be2le(init_vector);
+    return _mm_xor_si128(cypher, raw_aes128ecb_encrypt(init_vector, key_schedule));
+}
+
 static __inline void __fastcall aes192_expand_key_schedule(
     AesBlock192* key,
     Aes192KeySchedule* key_schedule)
@@ -199,6 +223,30 @@ static __inline AesBlock128 __fastcall aes192ofb_decrypt(
     return _mm_xor_si128(tmp, cypher);
 }
 
+static __inline AesBlock128 __fastcall aes192ctr_encrypt(
+    AesBlock128 plain,
+    Aes192KeySchedule* key_schedule,
+    AesBlock128 init_vector,
+    int counter)
+{
+    init_vector = aes128_le2be(init_vector);
+    init_vector = _mm_add_epi32(init_vector, make_aes_block128(0, 0, 0, counter));
+    init_vector = aes128_be2le(init_vector);
+    return _mm_xor_si128(plain, raw_aes192ecb_encrypt(init_vector, key_schedule));
+}
+
+static __inline AesBlock128 __fastcall aes192ctr_decrypt(
+    AesBlock128 cypher,
+    Aes192KeySchedule* key_schedule,
+    AesBlock128 init_vector,
+    int counter)
+{
+    init_vector = aes128_le2be(init_vector);
+    init_vector = _mm_add_epi32(init_vector, make_aes_block128(0, 0, 0, counter));
+    init_vector = aes128_be2le(init_vector);
+    return _mm_xor_si128(cypher, raw_aes192ecb_encrypt(init_vector, key_schedule));
+}
+
 static __inline void __fastcall aes256_expand_key_schedule(
     AesBlock256* key,
     Aes256KeySchedule* key_schedule)
@@ -292,3 +340,27 @@ static __inline AesBlock128 __fastcall aes256ofb_decrypt(
     _mm_storeu_si128(next_init_vector, tmp);
     return _mm_xor_si128(tmp, cypher);
 }
+
+static __inline AesBlock128 __fastcall aes256ctr_encrypt(
+    AesBlock128 plain,
+    Aes256KeySchedule* key_schedule,
+    AesBlock128 init_vector,
+    int counter)
+{
+    init_vector = aes128_le2be(init_vector);
+    init_vector = _mm_add_epi32(init_vector, make_aes_block128(0, 0, 0, counter));
+    init_vector = aes128_be2le(init_vector);
+    return _mm_xor_si128(plain, raw_aes256ecb_encrypt(init_vector, key_schedule));
+}
+
+static __inline AesBlock128 __fastcall aes256ctr_decrypt(
+    AesBlock128 cypher,
+    Aes256KeySchedule* key_schedule,
+    AesBlock128 init_vector,
+    int counter)
+{
+    init_vector = aes128_le2be(init_vector);
+    init_vector = _mm_add_epi32(init_vector, make_aes_block128(0, 0, 0, counter));
+    init_vector = aes128_be2le(init_vector);
+    return _mm_xor_si128(cypher, raw_aes256ecb_encrypt(init_vector, key_schedule));
+}
-- 
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