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authorHerbert Xu <herbert@gondor.apana.org.au>2006-08-21 21:38:42 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2006-09-21 11:44:35 +1000
commit28ce728a90cce3a0c6c0ed00354299de52db94b1 (patch)
treed5f8c799cb949a5afdfb9db4fb9c4c749820c35e /drivers/crypto/padlock-aes.c
parentdb131ef9084110d9e82549c0a627e157e8bb99d7 (diff)
downloadlinux-28ce728a90cce3a0c6c0ed00354299de52db94b1.tar.gz
[CRYPTO] padlock: Added block cipher versions of CBC/ECB
This patch adds block cipher algorithms for cbc(aes) and ecb(aes) for the PadLock device. Once all users to the old cipher type have been converted the old cbc/ecb PadLock operations will be removed. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/padlock-aes.c')
-rw-r--r--drivers/crypto/padlock-aes.c174
1 files changed, 167 insertions, 7 deletions
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index 3e683709243e..f53301e836d9 100644
--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -43,11 +43,11 @@
* ---------------------------------------------------------------------------
*/
+#include <crypto/algapi.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
-#include <linux/crypto.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <asm/byteorder.h>
@@ -297,9 +297,9 @@ aes_hw_extkey_available(uint8_t key_len)
return 0;
}
-static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
+static inline struct aes_ctx *aes_ctx_common(void *ctx)
{
- unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
+ unsigned long addr = (unsigned long)ctx;
unsigned long align = PADLOCK_ALIGNMENT;
if (align <= crypto_tfm_ctx_alignment())
@@ -307,6 +307,16 @@ static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
return (struct aes_ctx *)ALIGN(addr, align);
}
+static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
+{
+ return aes_ctx_common(crypto_tfm_ctx(tfm));
+}
+
+static inline struct aes_ctx *blk_aes_ctx(struct crypto_blkcipher *tfm)
+{
+ return aes_ctx_common(crypto_blkcipher_ctx(tfm));
+}
+
static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
@@ -507,6 +517,141 @@ static struct crypto_alg aes_alg = {
}
};
+static int ecb_aes_encrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ while ((nbytes = walk.nbytes)) {
+ padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,
+ ctx->E, &ctx->cword.encrypt,
+ nbytes / AES_BLOCK_SIZE);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+
+ return err;
+}
+
+static int ecb_aes_decrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ while ((nbytes = walk.nbytes)) {
+ padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,
+ ctx->D, &ctx->cword.decrypt,
+ nbytes / AES_BLOCK_SIZE);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+
+ return err;
+}
+
+static struct crypto_alg ecb_aes_alg = {
+ .cra_name = "ecb(aes)",
+ .cra_driver_name = "ecb-aes-padlock",
+ .cra_priority = PADLOCK_COMPOSITE_PRIORITY,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct aes_ctx),
+ .cra_alignmask = PADLOCK_ALIGNMENT - 1,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(ecb_aes_alg.cra_list),
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .setkey = aes_set_key,
+ .encrypt = ecb_aes_encrypt,
+ .decrypt = ecb_aes_decrypt,
+ }
+ }
+};
+
+static int cbc_aes_encrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ while ((nbytes = walk.nbytes)) {
+ u8 *iv = padlock_xcrypt_cbc(walk.src.virt.addr,
+ walk.dst.virt.addr, ctx->E,
+ walk.iv, &ctx->cword.encrypt,
+ nbytes / AES_BLOCK_SIZE);
+ memcpy(walk.iv, iv, AES_BLOCK_SIZE);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+
+ return err;
+}
+
+static int cbc_aes_decrypt(struct blkcipher_desc *desc,
+ struct scatterlist *dst, struct scatterlist *src,
+ unsigned int nbytes)
+{
+ struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
+ struct blkcipher_walk walk;
+ int err;
+
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ err = blkcipher_walk_virt(desc, &walk);
+
+ while ((nbytes = walk.nbytes)) {
+ padlock_xcrypt_cbc(walk.src.virt.addr, walk.dst.virt.addr,
+ ctx->D, walk.iv, &ctx->cword.decrypt,
+ nbytes / AES_BLOCK_SIZE);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ err = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+
+ return err;
+}
+
+static struct crypto_alg cbc_aes_alg = {
+ .cra_name = "cbc(aes)",
+ .cra_driver_name = "cbc-aes-padlock",
+ .cra_priority = PADLOCK_COMPOSITE_PRIORITY,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct aes_ctx),
+ .cra_alignmask = PADLOCK_ALIGNMENT - 1,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(cbc_aes_alg.cra_list),
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = aes_set_key,
+ .encrypt = cbc_aes_encrypt,
+ .decrypt = cbc_aes_decrypt,
+ }
+ }
+};
+
static int __init padlock_init(void)
{
int ret;
@@ -522,18 +667,33 @@ static int __init padlock_init(void)
}
gen_tabs();
- if ((ret = crypto_register_alg(&aes_alg))) {
- printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");
- return ret;
- }
+ if ((ret = crypto_register_alg(&aes_alg)))
+ goto aes_err;
+
+ if ((ret = crypto_register_alg(&ecb_aes_alg)))
+ goto ecb_aes_err;
+
+ if ((ret = crypto_register_alg(&cbc_aes_alg)))
+ goto cbc_aes_err;
printk(KERN_NOTICE PFX "Using VIA PadLock ACE for AES algorithm.\n");
+out:
return ret;
+
+cbc_aes_err:
+ crypto_unregister_alg(&ecb_aes_alg);
+ecb_aes_err:
+ crypto_unregister_alg(&aes_alg);
+aes_err:
+ printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");
+ goto out;
}
static void __exit padlock_fini(void)
{
+ crypto_unregister_alg(&cbc_aes_alg);
+ crypto_unregister_alg(&ecb_aes_alg);
crypto_unregister_alg(&aes_alg);
}