aesni-intel_glue.c

Go to the documentation of this file.

/*
 * Support for Intel AES-NI instructions. This file contains glue
 * code, the real AES implementation is in intel-aes_asm.S.
 *
 * Copyright (C) 2008, Intel Corp.
 *    Author: Huang Ying <[email protected]>
 *
 * Added RFC4106 AES-GCM support for 128-bit keys under the AEAD
 * interface for 64-bit kernels.
 *    Authors: Adrian Hoban <[email protected]>
 *             Gabriele Paoloni <[email protected]>
 *             Tadeusz Struk ([email protected])
 *             Aidan O'Mahony ([email protected])
 *    Copyright (c) 2010, Intel Corporation.
 *
 * 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.
 */

#include <linux/hardirq.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/module.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/cryptd.h>
#include <crypto/ctr.h>
#include <crypto/b128ops.h>
#include <crypto/lrw.h>
#include <crypto/xts.h>
#include <asm/cpu_device_id.h>
#include <asm/i387.h>
#include <asm/crypto/aes.h>
#include <asm/crypto/ablk_helper.h>
#include <crypto/scatterwalk.h>
#include <crypto/internal/aead.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>

#if defined(CONFIG_CRYPTO_CTR) || defined(CONFIG_CRYPTO_CTR_MODULE)
#define HAS_CTR
#endif

#if defined(CONFIG_CRYPTO_PCBC) || defined(CONFIG_CRYPTO_PCBC_MODULE)
#define HAS_PCBC
#endif

/* This data is stored at the end of the crypto_tfm struct.
 * It's a type of per "session" data storage location.
 * This needs to be 16 byte aligned.
 */
struct aesni_rfc4106_gcm_ctx {
    u8 hash_subkey[16];
    struct crypto_aes_ctx aes_key_expanded;
    u8 nonce[4];
    struct cryptd_aead *cryptd_tfm;
};

struct aesni_gcm_set_hash_subkey_result {
    int err;
    struct completion completion;
};

struct aesni_hash_subkey_req_data {
    u8 iv[16];
    struct aesni_gcm_set_hash_subkey_result result;
    struct scatterlist sg;
};

#define AESNI_ALIGN (16)
#define AES_BLOCK_MASK  (~(AES_BLOCK_SIZE-1))
#define RFC4106_HASH_SUBKEY_SIZE 16

struct aesni_lrw_ctx {
    struct lrw_table_ctx lrw_table;
    u8 raw_aes_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
};

struct aesni_xts_ctx {
    u8 raw_tweak_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
    u8 raw_crypt_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
};

asmlinkage int aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
                 unsigned int key_len);
asmlinkage void aesni_enc(struct crypto_aes_ctx *ctx, u8 *out,
              const u8 *in);
asmlinkage void aesni_dec(struct crypto_aes_ctx *ctx, u8 *out,
              const u8 *in);
asmlinkage void aesni_ecb_enc(struct crypto_aes_ctx *ctx, u8 *out,
                  const u8 *in, unsigned int len);
asmlinkage void aesni_ecb_dec(struct crypto_aes_ctx *ctx, u8 *out,
                  const u8 *in, unsigned int len);
asmlinkage void aesni_cbc_enc(struct crypto_aes_ctx *ctx, u8 *out,
                  const u8 *in, unsigned int len, u8 *iv);
asmlinkage void aesni_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out,
                  const u8 *in, unsigned int len, u8 *iv);

int crypto_fpu_init(void);
void crypto_fpu_exit(void);

#ifdef CONFIG_X86_64
asmlinkage void aesni_ctr_enc(struct crypto_aes_ctx *ctx, u8 *out,
                  const u8 *in, unsigned int len, u8 *iv);

/* asmlinkage void aesni_gcm_enc()
 * void *ctx,  AES Key schedule. Starts on a 16 byte boundary.
 * u8 *out, Ciphertext output. Encrypt in-place is allowed.
 * const u8 *in, Plaintext input
 * unsigned long plaintext_len, Length of data in bytes for encryption.
 * u8 *iv, Pre-counter block j0: 4 byte salt (from Security Association)
 *         concatenated with 8 byte Initialisation Vector (from IPSec ESP
 *         Payload) concatenated with 0x00000001. 16-byte aligned pointer.
 * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary.
 * const u8 *aad, Additional Authentication Data (AAD)
 * unsigned long aad_len, Length of AAD in bytes. With RFC4106 this
 *          is going to be 8 or 12 bytes
 * u8 *auth_tag, Authenticated Tag output.
 * unsigned long auth_tag_len), Authenticated Tag Length in bytes.
 *          Valid values are 16 (most likely), 12 or 8.
 */
asmlinkage void aesni_gcm_enc(void *ctx, u8 *out,
            const u8 *in, unsigned long plaintext_len, u8 *iv,
            u8 *hash_subkey, const u8 *aad, unsigned long aad_len,
            u8 *auth_tag, unsigned long auth_tag_len);

/* asmlinkage void aesni_gcm_dec()
 * void *ctx, AES Key schedule. Starts on a 16 byte boundary.
 * u8 *out, Plaintext output. Decrypt in-place is allowed.
 * const u8 *in, Ciphertext input
 * unsigned long ciphertext_len, Length of data in bytes for decryption.
 * u8 *iv, Pre-counter block j0: 4 byte salt (from Security Association)
 *         concatenated with 8 byte Initialisation Vector (from IPSec ESP
 *         Payload) concatenated with 0x00000001. 16-byte aligned pointer.
 * u8 *hash_subkey, the Hash sub key input. Data starts on a 16-byte boundary.
 * const u8 *aad, Additional Authentication Data (AAD)
 * unsigned long aad_len, Length of AAD in bytes. With RFC4106 this is going
 * to be 8 or 12 bytes
 * u8 *auth_tag, Authenticated Tag output.
 * unsigned long auth_tag_len) Authenticated Tag Length in bytes.
 * Valid values are 16 (most likely), 12 or 8.
 */
asmlinkage void aesni_gcm_dec(void *ctx, u8 *out,
            const u8 *in, unsigned long ciphertext_len, u8 *iv,
            u8 *hash_subkey, const u8 *aad, unsigned long aad_len,
            u8 *auth_tag, unsigned long auth_tag_len);

static inline struct
aesni_rfc4106_gcm_ctx *aesni_rfc4106_gcm_ctx_get(struct crypto_aead *tfm)
{
    return
        (struct aesni_rfc4106_gcm_ctx *)
        PTR_ALIGN((u8 *)
        crypto_tfm_ctx(crypto_aead_tfm(tfm)), AESNI_ALIGN);
}
#endif

static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx)
{
    unsigned long addr = (unsigned long)raw_ctx;
    unsigned long align = AESNI_ALIGN;

    if (align <= crypto_tfm_ctx_alignment())
        align = 1;
    return (struct crypto_aes_ctx *)ALIGN(addr, align);
}

static int aes_set_key_common(struct crypto_tfm *tfm, void *raw_ctx,
                  const u8 *in_key, unsigned int key_len)
{
    struct crypto_aes_ctx *ctx = aes_ctx(raw_ctx);
    u32 *flags = &tfm->crt_flags;
    int err;

    if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 &&
        key_len != AES_KEYSIZE_256) {
        *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
        return -EINVAL;
    }

    if (!irq_fpu_usable())
        err = crypto_aes_expand_key(ctx, in_key, key_len);
    else {
        kernel_fpu_begin();
        err = aesni_set_key(ctx, in_key, key_len);
        kernel_fpu_end();
    }

    return err;
}

static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
               unsigned int key_len)
{
    return aes_set_key_common(tfm, crypto_tfm_ctx(tfm), in_key, key_len);
}

static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));

    if (!irq_fpu_usable())
        crypto_aes_encrypt_x86(ctx, dst, src);
    else {
        kernel_fpu_begin();
        aesni_enc(ctx, dst, src);
        kernel_fpu_end();
    }
}

static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));

    if (!irq_fpu_usable())
        crypto_aes_decrypt_x86(ctx, dst, src);
    else {
        kernel_fpu_begin();
        aesni_dec(ctx, dst, src);
        kernel_fpu_end();
    }
}

static void __aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));

    aesni_enc(ctx, dst, src);
}

static void __aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_tfm_ctx(tfm));

    aesni_dec(ctx, dst, src);
}

static int ecb_encrypt(struct blkcipher_desc *desc,
               struct scatterlist *dst, struct scatterlist *src,
               unsigned int nbytes)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
    struct blkcipher_walk walk;
    int err;

    blkcipher_walk_init(&walk, dst, src, nbytes);
    err = blkcipher_walk_virt(desc, &walk);
    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    while ((nbytes = walk.nbytes)) {
        aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                  nbytes & AES_BLOCK_MASK);
        nbytes &= AES_BLOCK_SIZE - 1;
        err = blkcipher_walk_done(desc, &walk, nbytes);
    }
    kernel_fpu_end();

    return err;
}

static int ecb_decrypt(struct blkcipher_desc *desc,
               struct scatterlist *dst, struct scatterlist *src,
               unsigned int nbytes)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
    struct blkcipher_walk walk;
    int err;

    blkcipher_walk_init(&walk, dst, src, nbytes);
    err = blkcipher_walk_virt(desc, &walk);
    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    while ((nbytes = walk.nbytes)) {
        aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                  nbytes & AES_BLOCK_MASK);
        nbytes &= AES_BLOCK_SIZE - 1;
        err = blkcipher_walk_done(desc, &walk, nbytes);
    }
    kernel_fpu_end();

    return err;
}

static int cbc_encrypt(struct blkcipher_desc *desc,
               struct scatterlist *dst, struct scatterlist *src,
               unsigned int nbytes)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
    struct blkcipher_walk walk;
    int err;

    blkcipher_walk_init(&walk, dst, src, nbytes);
    err = blkcipher_walk_virt(desc, &walk);
    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    while ((nbytes = walk.nbytes)) {
        aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                  nbytes & AES_BLOCK_MASK, walk.iv);
        nbytes &= AES_BLOCK_SIZE - 1;
        err = blkcipher_walk_done(desc, &walk, nbytes);
    }
    kernel_fpu_end();

    return err;
}

static int cbc_decrypt(struct blkcipher_desc *desc,
               struct scatterlist *dst, struct scatterlist *src,
               unsigned int nbytes)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
    struct blkcipher_walk walk;
    int err;

    blkcipher_walk_init(&walk, dst, src, nbytes);
    err = blkcipher_walk_virt(desc, &walk);
    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    while ((nbytes = walk.nbytes)) {
        aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                  nbytes & AES_BLOCK_MASK, walk.iv);
        nbytes &= AES_BLOCK_SIZE - 1;
        err = blkcipher_walk_done(desc, &walk, nbytes);
    }
    kernel_fpu_end();

    return err;
}

#ifdef CONFIG_X86_64
static void ctr_crypt_final(struct crypto_aes_ctx *ctx,
                struct blkcipher_walk *walk)
{
    u8 *ctrblk = walk->iv;
    u8 keystream[AES_BLOCK_SIZE];
    u8 *src = walk->src.virt.addr;
    u8 *dst = walk->dst.virt.addr;
    unsigned int nbytes = walk->nbytes;

    aesni_enc(ctx, keystream, ctrblk);
    crypto_xor(keystream, src, nbytes);
    memcpy(dst, keystream, nbytes);
    crypto_inc(ctrblk, AES_BLOCK_SIZE);
}

static int ctr_crypt(struct blkcipher_desc *desc,
             struct scatterlist *dst, struct scatterlist *src,
             unsigned int nbytes)
{
    struct crypto_aes_ctx *ctx = aes_ctx(crypto_blkcipher_ctx(desc->tfm));
    struct blkcipher_walk walk;
    int err;

    blkcipher_walk_init(&walk, dst, src, nbytes);
    err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
        aesni_ctr_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                  nbytes & AES_BLOCK_MASK, walk.iv);
        nbytes &= AES_BLOCK_SIZE - 1;
        err = blkcipher_walk_done(desc, &walk, nbytes);
    }
    if (walk.nbytes) {
        ctr_crypt_final(ctx, &walk);
        err = blkcipher_walk_done(desc, &walk, 0);
    }
    kernel_fpu_end();

    return err;
}
#endif

static int ablk_ecb_init(struct crypto_tfm *tfm)
{
    return ablk_init_common(tfm, "__driver-ecb-aes-aesni");
}

static int ablk_cbc_init(struct crypto_tfm *tfm)
{
    return ablk_init_common(tfm, "__driver-cbc-aes-aesni");
}

#ifdef CONFIG_X86_64
static int ablk_ctr_init(struct crypto_tfm *tfm)
{
    return ablk_init_common(tfm, "__driver-ctr-aes-aesni");
}

#ifdef HAS_CTR
static int ablk_rfc3686_ctr_init(struct crypto_tfm *tfm)
{
    return ablk_init_common(tfm, "rfc3686(__driver-ctr-aes-aesni)");
}
#endif
#endif

#ifdef HAS_PCBC
static int ablk_pcbc_init(struct crypto_tfm *tfm)
{
    return ablk_init_common(tfm, "fpu(pcbc(__driver-aes-aesni))");
}
#endif

static void lrw_xts_encrypt_callback(void *ctx, u8 *blks, unsigned int nbytes)
{
    aesni_ecb_enc(ctx, blks, blks, nbytes);
}

static void lrw_xts_decrypt_callback(void *ctx, u8 *blks, unsigned int nbytes)
{
    aesni_ecb_dec(ctx, blks, blks, nbytes);
}

static int lrw_aesni_setkey(struct crypto_tfm *tfm, const u8 *key,
                unsigned int keylen)
{
    struct aesni_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
    int err;

    err = aes_set_key_common(tfm, ctx->raw_aes_ctx, key,
                 keylen - AES_BLOCK_SIZE);
    if (err)
        return err;

    return lrw_init_table(&ctx->lrw_table, key + keylen - AES_BLOCK_SIZE);
}

static void lrw_aesni_exit_tfm(struct crypto_tfm *tfm)
{
    struct aesni_lrw_ctx *ctx = crypto_tfm_ctx(tfm);

    lrw_free_table(&ctx->lrw_table);
}

static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
               struct scatterlist *src, unsigned int nbytes)
{
    struct aesni_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
    be128 buf[8];
    struct lrw_crypt_req req = {
        .tbuf = buf,
        .tbuflen = sizeof(buf),

        .table_ctx = &ctx->lrw_table,
        .crypt_ctx = aes_ctx(ctx->raw_aes_ctx),
        .crypt_fn = lrw_xts_encrypt_callback,
    };
    int ret;

    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    ret = lrw_crypt(desc, dst, src, nbytes, &req);
    kernel_fpu_end();

    return ret;
}

static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
               struct scatterlist *src, unsigned int nbytes)
{
    struct aesni_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
    be128 buf[8];
    struct lrw_crypt_req req = {
        .tbuf = buf,
        .tbuflen = sizeof(buf),

        .table_ctx = &ctx->lrw_table,
        .crypt_ctx = aes_ctx(ctx->raw_aes_ctx),
        .crypt_fn = lrw_xts_decrypt_callback,
    };
    int ret;

    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    ret = lrw_crypt(desc, dst, src, nbytes, &req);
    kernel_fpu_end();

    return ret;
}

static int xts_aesni_setkey(struct crypto_tfm *tfm, const u8 *key,
                unsigned int keylen)
{
    struct aesni_xts_ctx *ctx = crypto_tfm_ctx(tfm);
    u32 *flags = &tfm->crt_flags;
    int err;

    /* key consists of keys of equal size concatenated, therefore
     * the length must be even
     */
    if (keylen % 2) {
        *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
        return -EINVAL;
    }

    /* first half of xts-key is for crypt */
    err = aes_set_key_common(tfm, ctx->raw_crypt_ctx, key, keylen / 2);
    if (err)
        return err;

    /* second half of xts-key is for tweak */
    return aes_set_key_common(tfm, ctx->raw_tweak_ctx, key + keylen / 2,
                  keylen / 2);
}


static void aesni_xts_tweak(void *ctx, u8 *out, const u8 *in)
{
    aesni_enc(ctx, out, in);
}

static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
               struct scatterlist *src, unsigned int nbytes)
{
    struct aesni_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
    be128 buf[8];
    struct xts_crypt_req req = {
        .tbuf = buf,
        .tbuflen = sizeof(buf),

        .tweak_ctx = aes_ctx(ctx->raw_tweak_ctx),
        .tweak_fn = aesni_xts_tweak,
        .crypt_ctx = aes_ctx(ctx->raw_crypt_ctx),
        .crypt_fn = lrw_xts_encrypt_callback,
    };
    int ret;

    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    ret = xts_crypt(desc, dst, src, nbytes, &req);
    kernel_fpu_end();

    return ret;
}

static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
               struct scatterlist *src, unsigned int nbytes)
{
    struct aesni_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
    be128 buf[8];
    struct xts_crypt_req req = {
        .tbuf = buf,
        .tbuflen = sizeof(buf),

        .tweak_ctx = aes_ctx(ctx->raw_tweak_ctx),
        .tweak_fn = aesni_xts_tweak,
        .crypt_ctx = aes_ctx(ctx->raw_crypt_ctx),
        .crypt_fn = lrw_xts_decrypt_callback,
    };
    int ret;

    desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

    kernel_fpu_begin();
    ret = xts_crypt(desc, dst, src, nbytes, &req);
    kernel_fpu_end();

    return ret;
}

#ifdef CONFIG_X86_64
static int rfc4106_init(struct crypto_tfm *tfm)
{
    struct cryptd_aead *cryptd_tfm;
    struct aesni_rfc4106_gcm_ctx *ctx = (struct aesni_rfc4106_gcm_ctx *)
        PTR_ALIGN((u8 *)crypto_tfm_ctx(tfm), AESNI_ALIGN);
    struct crypto_aead *cryptd_child;
    struct aesni_rfc4106_gcm_ctx *child_ctx;
    cryptd_tfm = cryptd_alloc_aead("__driver-gcm-aes-aesni", 0, 0);
    if (IS_ERR(cryptd_tfm))
        return PTR_ERR(cryptd_tfm);

    cryptd_child = cryptd_aead_child(cryptd_tfm);
    child_ctx = aesni_rfc4106_gcm_ctx_get(cryptd_child);
    memcpy(child_ctx, ctx, sizeof(*ctx));
    ctx->cryptd_tfm = cryptd_tfm;
    tfm->crt_aead.reqsize = sizeof(struct aead_request)
        + crypto_aead_reqsize(&cryptd_tfm->base);
    return 0;
}

static void rfc4106_exit(struct crypto_tfm *tfm)
{
    struct aesni_rfc4106_gcm_ctx *ctx =
        (struct aesni_rfc4106_gcm_ctx *)
        PTR_ALIGN((u8 *)crypto_tfm_ctx(tfm), AESNI_ALIGN);
    if (!IS_ERR(ctx->cryptd_tfm))
        cryptd_free_aead(ctx->cryptd_tfm);
    return;
}

static void
rfc4106_set_hash_subkey_done(struct crypto_async_request *req, int err)
{
    struct aesni_gcm_set_hash_subkey_result *result = req->data;

    if (err == -EINPROGRESS)
        return;
    result->err = err;
    complete(&result->completion);
}

static int
rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len)
{
    struct crypto_ablkcipher *ctr_tfm;
    struct ablkcipher_request *req;
    int ret = -EINVAL;
    struct aesni_hash_subkey_req_data *req_data;

    ctr_tfm = crypto_alloc_ablkcipher("ctr(aes)", 0, 0);
    if (IS_ERR(ctr_tfm))
        return PTR_ERR(ctr_tfm);

    crypto_ablkcipher_clear_flags(ctr_tfm, ~0);

    ret = crypto_ablkcipher_setkey(ctr_tfm, key, key_len);
    if (ret)
        goto out_free_ablkcipher;

    ret = -ENOMEM;
    req = ablkcipher_request_alloc(ctr_tfm, GFP_KERNEL);
    if (!req)
        goto out_free_ablkcipher;

    req_data = kmalloc(sizeof(*req_data), GFP_KERNEL);
    if (!req_data)
        goto out_free_request;

    memset(req_data->iv, 0, sizeof(req_data->iv));

    /* Clear the data in the hash sub key container to zero.*/
    /* We want to cipher all zeros to create the hash sub key. */
    memset(hash_subkey, 0, RFC4106_HASH_SUBKEY_SIZE);

    init_completion(&req_data->result.completion);
    sg_init_one(&req_data->sg, hash_subkey, RFC4106_HASH_SUBKEY_SIZE);
    ablkcipher_request_set_tfm(req, ctr_tfm);
    ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP |
                    CRYPTO_TFM_REQ_MAY_BACKLOG,
                    rfc4106_set_hash_subkey_done,
                    &req_data->result);

    ablkcipher_request_set_crypt(req, &req_data->sg,
        &req_data->sg, RFC4106_HASH_SUBKEY_SIZE, req_data->iv);

    ret = crypto_ablkcipher_encrypt(req);
    if (ret == -EINPROGRESS || ret == -EBUSY) {
        ret = wait_for_completion_interruptible
            (&req_data->result.completion);
        if (!ret)
            ret = req_data->result.err;
    }
    kfree(req_data);
out_free_request:
    ablkcipher_request_free(req);
out_free_ablkcipher:
    crypto_free_ablkcipher(ctr_tfm);
    return ret;
}

static int rfc4106_set_key(struct crypto_aead *parent, const u8 *key,
                           unsigned int key_len)
{
    int ret = 0;
    struct crypto_tfm *tfm = crypto_aead_tfm(parent);
    struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(parent);
    struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
    struct aesni_rfc4106_gcm_ctx *child_ctx =
                                 aesni_rfc4106_gcm_ctx_get(cryptd_child);
    u8 *new_key_align, *new_key_mem = NULL;

    if (key_len < 4) {
        crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
        return -EINVAL;
    }
    /*Account for 4 byte nonce at the end.*/
    key_len -= 4;
    if (key_len != AES_KEYSIZE_128) {
        crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
        return -EINVAL;
    }

    memcpy(ctx->nonce, key + key_len, sizeof(ctx->nonce));
    /*This must be on a 16 byte boundary!*/
    if ((unsigned long)(&(ctx->aes_key_expanded.key_enc[0])) % AESNI_ALIGN)
        return -EINVAL;

    if ((unsigned long)key % AESNI_ALIGN) {
        /*key is not aligned: use an auxuliar aligned pointer*/
        new_key_mem = kmalloc(key_len+AESNI_ALIGN, GFP_KERNEL);
        if (!new_key_mem)
            return -ENOMEM;

        new_key_align = PTR_ALIGN(new_key_mem, AESNI_ALIGN);
        memcpy(new_key_align, key, key_len);
        key = new_key_align;
    }

    if (!irq_fpu_usable())
        ret = crypto_aes_expand_key(&(ctx->aes_key_expanded),
        key, key_len);
    else {
        kernel_fpu_begin();
        ret = aesni_set_key(&(ctx->aes_key_expanded), key, key_len);
        kernel_fpu_end();
    }
    /*This must be on a 16 byte boundary!*/
    if ((unsigned long)(&(ctx->hash_subkey[0])) % AESNI_ALIGN) {
        ret = -EINVAL;
        goto exit;
    }
    ret = rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len);
    memcpy(child_ctx, ctx, sizeof(*ctx));
exit:
    kfree(new_key_mem);
    return ret;
}

/* This is the Integrity Check Value (aka the authentication tag length and can
 * be 8, 12 or 16 bytes long. */
static int rfc4106_set_authsize(struct crypto_aead *parent,
                unsigned int authsize)
{
    struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(parent);
    struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);

    switch (authsize) {
    case 8:
    case 12:
    case 16:
        break;
    default:
        return -EINVAL;
    }
    crypto_aead_crt(parent)->authsize = authsize;
    crypto_aead_crt(cryptd_child)->authsize = authsize;
    return 0;
}

static int rfc4106_encrypt(struct aead_request *req)
{
    int ret;
    struct crypto_aead *tfm = crypto_aead_reqtfm(req);
    struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);

    if (!irq_fpu_usable()) {
        struct aead_request *cryptd_req =
            (struct aead_request *) aead_request_ctx(req);
        memcpy(cryptd_req, req, sizeof(*req));
        aead_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
        return crypto_aead_encrypt(cryptd_req);
    } else {
        struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
        kernel_fpu_begin();
        ret = cryptd_child->base.crt_aead.encrypt(req);
        kernel_fpu_end();
        return ret;
    }
}

static int rfc4106_decrypt(struct aead_request *req)
{
    int ret;
    struct crypto_aead *tfm = crypto_aead_reqtfm(req);
    struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);

    if (!irq_fpu_usable()) {
        struct aead_request *cryptd_req =
            (struct aead_request *) aead_request_ctx(req);
        memcpy(cryptd_req, req, sizeof(*req));
        aead_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base);
        return crypto_aead_decrypt(cryptd_req);
    } else {
        struct crypto_aead *cryptd_child = cryptd_aead_child(ctx->cryptd_tfm);
        kernel_fpu_begin();
        ret = cryptd_child->base.crt_aead.decrypt(req);
        kernel_fpu_end();
        return ret;
    }
}

static int __driver_rfc4106_encrypt(struct aead_request *req)
{
    u8 one_entry_in_sg = 0;
    u8 *src, *dst, *assoc;
    __be32 counter = cpu_to_be32(1);
    struct crypto_aead *tfm = crypto_aead_reqtfm(req);
    struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
    void *aes_ctx = &(ctx->aes_key_expanded);
    unsigned long auth_tag_len = crypto_aead_authsize(tfm);
    u8 iv_tab[16+AESNI_ALIGN];
    u8* iv = (u8 *) PTR_ALIGN((u8 *)iv_tab, AESNI_ALIGN);
    struct scatter_walk src_sg_walk;
    struct scatter_walk assoc_sg_walk;
    struct scatter_walk dst_sg_walk;
    unsigned int i;

    /* Assuming we are supporting rfc4106 64-bit extended */
    /* sequence numbers We need to have the AAD length equal */
    /* to 8 or 12 bytes */
    if (unlikely(req->assoclen != 8 && req->assoclen != 12))
        return -EINVAL;
    /* IV below built */
    for (i = 0; i < 4; i++)
        *(iv+i) = ctx->nonce[i];
    for (i = 0; i < 8; i++)
        *(iv+4+i) = req->iv[i];
    *((__be32 *)(iv+12)) = counter;

    if ((sg_is_last(req->src)) && (sg_is_last(req->assoc))) {
        one_entry_in_sg = 1;
        scatterwalk_start(&src_sg_walk, req->src);
        scatterwalk_start(&assoc_sg_walk, req->assoc);
        src = scatterwalk_map(&src_sg_walk);
        assoc = scatterwalk_map(&assoc_sg_walk);
        dst = src;
        if (unlikely(req->src != req->dst)) {
            scatterwalk_start(&dst_sg_walk, req->dst);
            dst = scatterwalk_map(&dst_sg_walk);
        }

    } else {
        /* Allocate memory for src, dst, assoc */
        src = kmalloc(req->cryptlen + auth_tag_len + req->assoclen,
            GFP_ATOMIC);
        if (unlikely(!src))
            return -ENOMEM;
        assoc = (src + req->cryptlen + auth_tag_len);
        scatterwalk_map_and_copy(src, req->src, 0, req->cryptlen, 0);
        scatterwalk_map_and_copy(assoc, req->assoc, 0,
                    req->assoclen, 0);
        dst = src;
    }

    aesni_gcm_enc(aes_ctx, dst, src, (unsigned long)req->cryptlen, iv,
        ctx->hash_subkey, assoc, (unsigned long)req->assoclen, dst
        + ((unsigned long)req->cryptlen), auth_tag_len);

    /* The authTag (aka the Integrity Check Value) needs to be written
     * back to the packet. */
    if (one_entry_in_sg) {
        if (unlikely(req->src != req->dst)) {
            scatterwalk_unmap(dst);
            scatterwalk_done(&dst_sg_walk, 0, 0);
        }
        scatterwalk_unmap(src);
        scatterwalk_unmap(assoc);
        scatterwalk_done(&src_sg_walk, 0, 0);
        scatterwalk_done(&assoc_sg_walk, 0, 0);
    } else {
        scatterwalk_map_and_copy(dst, req->dst, 0,
            req->cryptlen + auth_tag_len, 1);
        kfree(src);
    }
    return 0;
}

static int __driver_rfc4106_decrypt(struct aead_request *req)
{
    u8 one_entry_in_sg = 0;
    u8 *src, *dst, *assoc;
    unsigned long tempCipherLen = 0;
    __be32 counter = cpu_to_be32(1);
    int retval = 0;
    struct crypto_aead *tfm = crypto_aead_reqtfm(req);
    struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);
    void *aes_ctx = &(ctx->aes_key_expanded);
    unsigned long auth_tag_len = crypto_aead_authsize(tfm);
    u8 iv_and_authTag[32+AESNI_ALIGN];
    u8 *iv = (u8 *) PTR_ALIGN((u8 *)iv_and_authTag, AESNI_ALIGN);
    u8 *authTag = iv + 16;
    struct scatter_walk src_sg_walk;
    struct scatter_walk assoc_sg_walk;
    struct scatter_walk dst_sg_walk;
    unsigned int i;

    if (unlikely((req->cryptlen < auth_tag_len) ||
        (req->assoclen != 8 && req->assoclen != 12)))
        return -EINVAL;
    /* Assuming we are supporting rfc4106 64-bit extended */
    /* sequence numbers We need to have the AAD length */
    /* equal to 8 or 12 bytes */

    tempCipherLen = (unsigned long)(req->cryptlen - auth_tag_len);
    /* IV below built */
    for (i = 0; i < 4; i++)
        *(iv+i) = ctx->nonce[i];
    for (i = 0; i < 8; i++)
        *(iv+4+i) = req->iv[i];
    *((__be32 *)(iv+12)) = counter;

    if ((sg_is_last(req->src)) && (sg_is_last(req->assoc))) {
        one_entry_in_sg = 1;
        scatterwalk_start(&src_sg_walk, req->src);
        scatterwalk_start(&assoc_sg_walk, req->assoc);
        src = scatterwalk_map(&src_sg_walk);
        assoc = scatterwalk_map(&assoc_sg_walk);
        dst = src;
        if (unlikely(req->src != req->dst)) {
            scatterwalk_start(&dst_sg_walk, req->dst);
            dst = scatterwalk_map(&dst_sg_walk);
        }

    } else {
        /* Allocate memory for src, dst, assoc */
        src = kmalloc(req->cryptlen + req->assoclen, GFP_ATOMIC);
        if (!src)
            return -ENOMEM;
        assoc = (src + req->cryptlen + auth_tag_len);
        scatterwalk_map_and_copy(src, req->src, 0, req->cryptlen, 0);
        scatterwalk_map_and_copy(assoc, req->assoc, 0,
            req->assoclen, 0);
        dst = src;
    }

    aesni_gcm_dec(aes_ctx, dst, src, tempCipherLen, iv,
        ctx->hash_subkey, assoc, (unsigned long)req->assoclen,
        authTag, auth_tag_len);

    /* Compare generated tag with passed in tag. */
    retval = memcmp(src + tempCipherLen, authTag, auth_tag_len) ?
        -EBADMSG : 0;

    if (one_entry_in_sg) {
        if (unlikely(req->src != req->dst)) {
            scatterwalk_unmap(dst);
            scatterwalk_done(&dst_sg_walk, 0, 0);
        }
        scatterwalk_unmap(src);
        scatterwalk_unmap(assoc);
        scatterwalk_done(&src_sg_walk, 0, 0);
        scatterwalk_done(&assoc_sg_walk, 0, 0);
    } else {
        scatterwalk_map_and_copy(dst, req->dst, 0, req->cryptlen, 1);
        kfree(src);
    }
    return retval;
}
#endif

static struct crypto_alg aesni_algs[] = { {
    .cra_name       = "aes",
    .cra_driver_name    = "aes-aesni",
    .cra_priority       = 300,
    .cra_flags      = CRYPTO_ALG_TYPE_CIPHER,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct crypto_aes_ctx) +
                  AESNI_ALIGN - 1,
    .cra_alignmask      = 0,
    .cra_module     = THIS_MODULE,
    .cra_u  = {
        .cipher = {
            .cia_min_keysize    = AES_MIN_KEY_SIZE,
            .cia_max_keysize    = AES_MAX_KEY_SIZE,
            .cia_setkey     = aes_set_key,
            .cia_encrypt        = aes_encrypt,
            .cia_decrypt        = aes_decrypt
        }
    }
}, {
    .cra_name       = "__aes-aesni",
    .cra_driver_name    = "__driver-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_CIPHER,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct crypto_aes_ctx) +
                  AESNI_ALIGN - 1,
    .cra_alignmask      = 0,
    .cra_module     = THIS_MODULE,
    .cra_u  = {
        .cipher = {
            .cia_min_keysize    = AES_MIN_KEY_SIZE,
            .cia_max_keysize    = AES_MAX_KEY_SIZE,
            .cia_setkey     = aes_set_key,
            .cia_encrypt        = __aes_encrypt,
            .cia_decrypt        = __aes_decrypt
        }
    }
}, {
    .cra_name       = "__ecb-aes-aesni",
    .cra_driver_name    = "__driver-ecb-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_BLKCIPHER,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct crypto_aes_ctx) +
                  AESNI_ALIGN - 1,
    .cra_alignmask      = 0,
    .cra_type       = &crypto_blkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_u = {
        .blkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .setkey     = aes_set_key,
            .encrypt    = ecb_encrypt,
            .decrypt    = ecb_decrypt,
        },
    },
}, {
    .cra_name       = "__cbc-aes-aesni",
    .cra_driver_name    = "__driver-cbc-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_BLKCIPHER,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct crypto_aes_ctx) +
                  AESNI_ALIGN - 1,
    .cra_alignmask      = 0,
    .cra_type       = &crypto_blkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_u = {
        .blkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .setkey     = aes_set_key,
            .encrypt    = cbc_encrypt,
            .decrypt    = cbc_decrypt,
        },
    },
}, {
    .cra_name       = "ecb(aes)",
    .cra_driver_name    = "ecb-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_ecb_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .setkey     = ablk_set_key,
            .encrypt    = ablk_encrypt,
            .decrypt    = ablk_decrypt,
        },
    },
}, {
    .cra_name       = "cbc(aes)",
    .cra_driver_name    = "cbc-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_cbc_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = ablk_set_key,
            .encrypt    = ablk_encrypt,
            .decrypt    = ablk_decrypt,
        },
    },
#ifdef CONFIG_X86_64
}, {
    .cra_name       = "__ctr-aes-aesni",
    .cra_driver_name    = "__driver-ctr-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_BLKCIPHER,
    .cra_blocksize      = 1,
    .cra_ctxsize        = sizeof(struct crypto_aes_ctx) +
                  AESNI_ALIGN - 1,
    .cra_alignmask      = 0,
    .cra_type       = &crypto_blkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_u = {
        .blkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = aes_set_key,
            .encrypt    = ctr_crypt,
            .decrypt    = ctr_crypt,
        },
    },
}, {
    .cra_name       = "ctr(aes)",
    .cra_driver_name    = "ctr-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = 1,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_ctr_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = ablk_set_key,
            .encrypt    = ablk_encrypt,
            .decrypt    = ablk_encrypt,
            .geniv      = "chainiv",
        },
    },
}, {
    .cra_name       = "__gcm-aes-aesni",
    .cra_driver_name    = "__driver-gcm-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_AEAD,
    .cra_blocksize      = 1,
    .cra_ctxsize        = sizeof(struct aesni_rfc4106_gcm_ctx) +
                  AESNI_ALIGN,
    .cra_alignmask      = 0,
    .cra_type       = &crypto_aead_type,
    .cra_module     = THIS_MODULE,
    .cra_u = {
        .aead = {
            .encrypt    = __driver_rfc4106_encrypt,
            .decrypt    = __driver_rfc4106_decrypt,
        },
    },
}, {
    .cra_name       = "rfc4106(gcm(aes))",
    .cra_driver_name    = "rfc4106-gcm-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = 1,
    .cra_ctxsize        = sizeof(struct aesni_rfc4106_gcm_ctx) +
                  AESNI_ALIGN,
    .cra_alignmask      = 0,
    .cra_type       = &crypto_nivaead_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = rfc4106_init,
    .cra_exit       = rfc4106_exit,
    .cra_u = {
        .aead = {
            .setkey     = rfc4106_set_key,
            .setauthsize    = rfc4106_set_authsize,
            .encrypt    = rfc4106_encrypt,
            .decrypt    = rfc4106_decrypt,
            .geniv      = "seqiv",
            .ivsize     = 8,
            .maxauthsize    = 16,
        },
    },
#ifdef HAS_CTR
}, {
    .cra_name       = "rfc3686(ctr(aes))",
    .cra_driver_name    = "rfc3686-ctr-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = 1,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_rfc3686_ctr_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize = AES_MIN_KEY_SIZE +
                       CTR_RFC3686_NONCE_SIZE,
            .max_keysize = AES_MAX_KEY_SIZE +
                       CTR_RFC3686_NONCE_SIZE,
            .ivsize      = CTR_RFC3686_IV_SIZE,
            .setkey      = ablk_set_key,
            .encrypt     = ablk_encrypt,
            .decrypt     = ablk_decrypt,
            .geniv       = "seqiv",
        },
    },
#endif
#endif
#ifdef HAS_PCBC
}, {
    .cra_name       = "pcbc(aes)",
    .cra_driver_name    = "pcbc-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_pcbc_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = ablk_set_key,
            .encrypt    = ablk_encrypt,
            .decrypt    = ablk_decrypt,
        },
    },
#endif
}, {
    .cra_name       = "__lrw-aes-aesni",
    .cra_driver_name    = "__driver-lrw-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_BLKCIPHER,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct aesni_lrw_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_blkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_exit       = lrw_aesni_exit_tfm,
    .cra_u = {
        .blkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE + AES_BLOCK_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE + AES_BLOCK_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = lrw_aesni_setkey,
            .encrypt    = lrw_encrypt,
            .decrypt    = lrw_decrypt,
        },
    },
}, {
    .cra_name       = "__xts-aes-aesni",
    .cra_driver_name    = "__driver-xts-aes-aesni",
    .cra_priority       = 0,
    .cra_flags      = CRYPTO_ALG_TYPE_BLKCIPHER,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct aesni_xts_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_blkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_u = {
        .blkcipher = {
            .min_keysize    = 2 * AES_MIN_KEY_SIZE,
            .max_keysize    = 2 * AES_MAX_KEY_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = xts_aesni_setkey,
            .encrypt    = xts_encrypt,
            .decrypt    = xts_decrypt,
        },
    },
}, {
    .cra_name       = "lrw(aes)",
    .cra_driver_name    = "lrw-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize    = AES_MIN_KEY_SIZE + AES_BLOCK_SIZE,
            .max_keysize    = AES_MAX_KEY_SIZE + AES_BLOCK_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = ablk_set_key,
            .encrypt    = ablk_encrypt,
            .decrypt    = ablk_decrypt,
        },
    },
}, {
    .cra_name       = "xts(aes)",
    .cra_driver_name    = "xts-aes-aesni",
    .cra_priority       = 400,
    .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
    .cra_blocksize      = AES_BLOCK_SIZE,
    .cra_ctxsize        = sizeof(struct async_helper_ctx),
    .cra_alignmask      = 0,
    .cra_type       = &crypto_ablkcipher_type,
    .cra_module     = THIS_MODULE,
    .cra_init       = ablk_init,
    .cra_exit       = ablk_exit,
    .cra_u = {
        .ablkcipher = {
            .min_keysize    = 2 * AES_MIN_KEY_SIZE,
            .max_keysize    = 2 * AES_MAX_KEY_SIZE,
            .ivsize     = AES_BLOCK_SIZE,
            .setkey     = ablk_set_key,
            .encrypt    = ablk_encrypt,
            .decrypt    = ablk_decrypt,
        },
    },
} };


static const struct x86_cpu_id aesni_cpu_id[] = {
    X86_FEATURE_MATCH(X86_FEATURE_AES),
    {}
};
MODULE_DEVICE_TABLE(x86cpu, aesni_cpu_id);

static int __init aesni_init(void)
{
    int err;

    if (!x86_match_cpu(aesni_cpu_id))
        return -ENODEV;

    err = crypto_fpu_init();
    if (err)
        return err;

    return crypto_register_algs(aesni_algs, ARRAY_SIZE(aesni_algs));
}

static void __exit aesni_exit(void)
{
    crypto_unregister_algs(aesni_algs, ARRAY_SIZE(aesni_algs));

    crypto_fpu_exit();
}

module_init(aesni_init);
module_exit(aesni_exit);

MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm, Intel AES-NI instructions optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS("aes");