Skip to content

L
linux-davinci
Commit cd7c3bfe authored by Sebastian Siewior's avatar Sebastian Siewior Committed by Herbert Xu
Browse files
Options

[CRYPTO] geode: Add fallback for unsupported modes 

The Geode AES crypto engine supports only 128 bit long key. This
patch adds fallback for other key sizes which are required by the
AES standard.
Signed-off-by: default avatarSebastian Siewior <sebastian@breakpoint.cc>
Acked-by: default avatarJordan Crouse <jordan.crouse@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 5157dea8
Show whitespace changes
Inline Side-by-side
Showing with 206 additions and 43 deletions
drivers/crypto/geode-aes.c
View file @ cd7c3bfe
......@@ -113,18 +113,103 @@ geode_aes_crypt(struct geode_aes_op *op)
/* CRYPTO-API Functions */
static int
geode_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len)
static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
unsigned int len)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
unsigned int ret;
op->keylen = len;
if (len == AES_KEYSIZE_128) {
memcpy(op->key, key, len);
return 0;
}
if (len != AES_KEY_LENGTH) {
if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
/* not supported at all */
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
/*
* The requested key size is not supported by HW, do a fallback
*/
op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
ret = crypto_cipher_setkey(op->fallback.cip, key, len);
if (ret) {
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
}
return ret;
}
static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
unsigned int len)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
unsigned int ret;
op->keylen = len;
if (len == AES_KEYSIZE_128) {
memcpy(op->key, key, len);
return 0;
}
if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
/* not supported at all */
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
/*
* The requested key size is not supported by HW, do a fallback
*/
op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
if (ret) {
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
}
return ret;
}
static int fallback_blk_dec(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
unsigned int ret;
struct crypto_blkcipher *tfm;
struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
tfm = desc->tfm;
desc->tfm = op->fallback.blk;
ret = crypto_blkcipher_decrypt(desc, dst, src, nbytes);
desc->tfm = tfm;
return ret;
}
static int fallback_blk_enc(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
unsigned int ret;
struct crypto_blkcipher *tfm;
struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
tfm = desc->tfm;
desc->tfm = op->fallback.blk;
ret = crypto_blkcipher_encrypt(desc, dst, src, nbytes);
desc->tfm = tfm;
return ret;
}
static void
......@@ -132,8 +217,10 @@ geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
if ((out == NULL) || (in == NULL))
if (unlikely(op->keylen != AES_KEYSIZE_128)) {
crypto_cipher_encrypt_one(op->fallback.cip, out, in);
return;
}
op->src = (void *) in;
op->dst = (void *) out;
......@@ -151,8 +238,10 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
if ((out == NULL) || (in == NULL))
if (unlikely(op->keylen != AES_KEYSIZE_128)) {
crypto_cipher_decrypt_one(op->fallback.cip, out, in);
return;
}
op->src = (void *) in;
op->dst = (void *) out;
......@@ -164,22 +253,48 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
geode_aes_crypt(op);
}
static int fallback_init_cip(struct crypto_tfm *tfm)
{
const char *name = tfm->__crt_alg->cra_name;
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
op->fallback.cip = crypto_alloc_cipher(name, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(op->fallback.cip)) {
printk(KERN_ERR "Error allocating fallback algo %s\n", name);
return PTR_ERR(op->fallback.blk);
}
return 0;
}
static void fallback_exit_cip(struct crypto_tfm *tfm)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
crypto_free_cipher(op->fallback.cip);
op->fallback.cip = NULL;
}
static struct crypto_alg geode_alg = {
.cra_name = "aes",
.cra_driver_name = "geode-aes-128",
.cra_driver_name = "geode-aes",
.cra_priority = 300,
.cra_alignmask = 15,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_init = fallback_init_cip,
.cra_exit = fallback_exit_cip,
.cra_blocksize = AES_MIN_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct geode_aes_op),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
.cra_u = {
.cipher = {
.cia_min_keysize = AES_KEY_LENGTH,
.cia_max_keysize = AES_KEY_LENGTH,
.cia_setkey = geode_setkey,
.cia_min_keysize = AES_MIN_KEY_SIZE,
.cia_max_keysize = AES_MAX_KEY_SIZE,
.cia_setkey = geode_setkey_cip,
.cia_encrypt = geode_encrypt,
.cia_decrypt = geode_decrypt
}
......@@ -195,6 +310,9 @@ geode_cbc_decrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
memcpy(op->iv, walk.iv, AES_IV_LENGTH);
......@@ -225,6 +343,9 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
memcpy(op->iv, walk.iv, AES_IV_LENGTH);
......@@ -245,11 +366,38 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
return err;
}
static int fallback_init_blk(struct crypto_tfm *tfm)
{
const char *name = tfm->__crt_alg->cra_name;
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
op->fallback.blk = crypto_alloc_blkcipher(name, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(op->fallback.blk)) {
printk(KERN_ERR "Error allocating fallback algo %s\n", name);
return PTR_ERR(op->fallback.blk);
}
return 0;
}
static void fallback_exit_blk(struct crypto_tfm *tfm)
{
struct geode_aes_op *op = crypto_tfm_ctx(tfm);
crypto_free_blkcipher(op->fallback.blk);
op->fallback.blk = NULL;
}
static struct crypto_alg geode_cbc_alg = {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-geode-128",
.cra_driver_name = "cbc-aes-geode",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_init = fallback_init_blk,
.cra_exit = fallback_exit_blk,
.cra_blocksize = AES_MIN_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct geode_aes_op),
.cra_alignmask = 15,
......@@ -258,9 +406,9 @@ static struct crypto_alg geode_cbc_alg = {
.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = AES_KEY_LENGTH,
.max_keysize = AES_KEY_LENGTH,
.setkey = geode_setkey,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = geode_setkey_blk,
.encrypt = geode_cbc_encrypt,
.decrypt = geode_cbc_decrypt,
.ivsize = AES_IV_LENGTH,
......@@ -277,6 +425,9 @@ geode_ecb_decrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
......@@ -304,6 +455,9 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
struct blkcipher_walk walk;
int err, ret;
if (unlikely(op->keylen != AES_KEYSIZE_128))
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
......@@ -324,9 +478,12 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
static struct crypto_alg geode_ecb_alg = {
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-geode-128",
.cra_driver_name = "ecb-aes-geode",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_init = fallback_init_blk,
.cra_exit = fallback_exit_blk,
.cra_blocksize = AES_MIN_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct geode_aes_op),
.cra_alignmask = 15,
......@@ -335,9 +492,9 @@ static struct crypto_alg geode_ecb_alg = {
.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = AES_KEY_LENGTH,
.max_keysize = AES_KEY_LENGTH,
.setkey = geode_setkey,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = geode_setkey_blk,
.encrypt = geode_ecb_encrypt,
.decrypt = geode_ecb_decrypt,
}
......@@ -367,7 +524,7 @@ geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
if ((ret = pci_enable_device(dev)))
return ret;
if ((ret = pci_request_regions(dev, "geode-aes-128")))
if ((ret = pci_request_regions(dev, "geode-aes")))
goto eenable;
_iobase = pci_iomap(dev, 0, 0);
......
drivers/crypto/geode-aes.h
View file @ cd7c3bfe
......@@ -66,6 +66,12 @@ struct geode_aes_op {
u8 key[AES_KEY_LENGTH];
u8 iv[AES_IV_LENGTH];
union {
struct crypto_blkcipher *blk;
struct crypto_cipher *cip;
} fallback;
u32 keylen;
};
#endif
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment