[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>

3 files changed, 169 insertions, 7 deletions

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 86c99cd333f..adb554153f6 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -27,6 +27,7 @@ config CRYPTO_DEV_PADLOCK
 config CRYPTO_DEV_PADLOCK_AES
         tristate "PadLock driver for AES algorithm"
         depends on CRYPTO_DEV_PADLOCK
+        select CRYPTO_BLKCIPHER
         default m
         help
           Use VIA PadLock for AES algorithm.
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index 3e683709243..f53301e836d 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);
 }
 
diff --git a/drivers/crypto/padlock.h b/drivers/crypto/padlock.h
index 7e3385b0904..b728e4518bd 100644
--- a/drivers/crypto/padlock.h
+++ b/drivers/crypto/padlock.h
@@ -18,5 +18,6 @@
 #define PFX     "padlock: "
 
 #define PADLOCK_CRA_PRIORITY    300
+#define PADLOCK_COMPOSITE_PRIORITY 400
 
 #endif  /* _CRYPTO_PADLOCK_H */