--- /dev/null
+/*
+ * Copyright (C) 2015 Martin Willi
+ * Copyright (C) 2015 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "aesni_key.h"
+
+/**
+ * Rounds used for each AES key size
+ */
+#define AES128_ROUNDS 10
+
+typedef struct private_aesni_key_t private_aesni_key_t;
+
+/**
+ * Private data of an aesni_key_t object.
+ */
+struct private_aesni_key_t {
+
+ /**
+ * Public aesni_key_t interface.
+ */
+ aesni_key_t public;
+};
+
+/**
+ * Invert round encryption keys to get a decryption key schedule
+ */
+static void reverse_key(aesni_key_t *this)
+{
+ __m128i t[this->rounds + 1];
+ int i;
+
+ for (i = 0; i <= this->rounds; i++)
+ {
+ t[i] = this->schedule[i];
+ }
+ this->schedule[this->rounds] = t[0];
+ for (i = 1; i < this->rounds; i++)
+ {
+ this->schedule[this->rounds - i] = _mm_aesimc_si128(t[i]);
+ }
+ this->schedule[0] = t[this->rounds];
+
+ memwipe(t, sizeof(t));
+}
+
+METHOD(aesni_key_t, destroy, void,
+ private_aesni_key_t *this)
+{
+ memwipe(this, sizeof(*this) + (this->public.rounds + 1) * AES_BLOCK_SIZE);
+ free(this);
+}
+
+/**
+ * See header
+ */
+aesni_key_t *aesni_key_create(bool encrypt, chunk_t key)
+{
+ private_aesni_key_t *this;
+ int rounds;
+
+ switch (key.len)
+ {
+ default:
+ return NULL;
+ }
+
+ INIT_EXTRA(this, (rounds + 1) * AES_BLOCK_SIZE,
+ .public = {
+ .destroy = _destroy,
+ .rounds = rounds,
+ },
+ );
+
+ switch (key.len)
+ {
+ default:
+ break;
+ }
+
+ if (!encrypt)
+ {
+ reverse_key(&this->public);
+ }
+
+ return &this->public;
+}
--- /dev/null
+/*
+ * Copyright (C) 2015 Martin Willi
+ * Copyright (C) 2015 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup aesni_key aesni_key
+ * @{ @ingroup aesni
+ */
+
+#ifndef AESNI_KEY_H_
+#define AESNI_KEY_H_
+
+#include <library.h>
+
+#include <wmmintrin.h>
+
+/**
+ * AES block size, in bytes
+ */
+#define AES_BLOCK_SIZE 16
+
+typedef struct aesni_key_t aesni_key_t;
+
+/**
+ * Key schedule for encryption/decryption using on AES-NI.
+ */
+struct aesni_key_t {
+
+ /**
+ * Destroy a aesni_key_t.
+ */
+ void (*destroy)(aesni_key_t *this);
+
+ /**
+ * Number of AES rounds (10, 12, 14)
+ */
+ int rounds;
+
+ /**
+ * Key schedule, for each round + the round 0 (whitening)
+ */
+ __attribute__((aligned(sizeof(__m128i)))) __m128i schedule[];
+};
+
+/**
+ * Create a AESNI key schedule instance.
+ *
+ * @param encrypt TRUE for encryption schedule, FALSE for decryption
+ * @param key non-expanded crypto key, 16, 24 or 32 bytes
+ * @return key schedule, NULL on invalid key size
+ */
+aesni_key_t *aesni_key_create(bool encrypt, chunk_t key);
+
+#endif /** AESNI_KEY_H_ @}*/