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 int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int keylen)
{
struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
int err;
err = xts_verify_key(tfm, key, keylen);
if (err)
return err;
keylen /= 2;
/* first half of xts-key is for crypt */
err = aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_crypt_ctx,
key, keylen);
if (err)
return err;
/* second half of xts-key is for tweak */
return aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_tweak_ctx,
key + keylen, keylen);
}
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 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);
int err;
err = xts_check_key(tfm, key, keylen);
if (err)
return err;
/* 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);
}
#ifdef CONFIG_X86_64
static void aesni_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
{
glue_xts_crypt_128bit_one(ctx, dst, src, iv, GLUE_FUNC_CAST(aesni_enc));
}
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;
}
#ifdef CONFIG_FERRET
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);
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);
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 aesni_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int len)
{
return aes_set_key_common(crypto_skcipher_tfm(tfm),
crypto_skcipher_ctx(tfm), key, len);
}
