[CRYPTO] padlock: Only reset the key once for each CBC and ECB operation

[deliverable/linux.git] / drivers / crypto / padlock-aes.c

diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index c33334ac987e8053b96a00f431d2ce0c86e9e398..2f3ad3f7dfea2229893864b7b31e9a3dfb5f61c6 100644 (file)
--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -417,6 +417,11 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 /* ====== Encryption/decryption routines ====== */
 
 /* These are the real call to PadLock. */
+static inline void padlock_reset_key(void)
+{
+       asm volatile ("pushfl; popfl");
+}
+
 static inline void padlock_xcrypt(const u8 *input, u8 *output, void *key,
                                  void *control_word)
 {
@@ -437,8 +442,6 @@ static void aes_crypt_copy(const u8 *in, u8 *out, u32 *key, struct cword *cword)
 static inline void aes_crypt(const u8 *in, u8 *out, u32 *key,
                             struct cword *cword)
 {
-       asm volatile ("pushfl; popfl");
-
        /* padlock_xcrypt requires at least two blocks of data. */
        if (unlikely(!(((unsigned long)in ^ (PAGE_SIZE - AES_BLOCK_SIZE)) &
                       (PAGE_SIZE - 1)))) {
@@ -457,7 +460,6 @@ static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key,
                return;
        }
 
-       asm volatile ("pushfl; popfl");         /* enforce key reload. */
        asm volatile ("test $1, %%cl;"
                      "je 1f;"
                      "lea -1(%%ecx), %%eax;"
@@ -474,8 +476,6 @@ static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key,
 static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key,
                                     u8 *iv, void *control_word, u32 count)
 {
-       /* Enforce key reload. */
-       asm volatile ("pushfl; popfl");
        /* rep xcryptcbc */
        asm volatile (".byte 0xf3,0x0f,0xa7,0xd0"
                      : "+S" (input), "+D" (output), "+a" (iv)
@@ -486,12 +486,14 @@ static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key,
 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
        struct aes_ctx *ctx = aes_ctx(tfm);
+       padlock_reset_key();
        aes_crypt(in, out, ctx->E, &ctx->cword.encrypt);
 }
 
 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
        struct aes_ctx *ctx = aes_ctx(tfm);
+       padlock_reset_key();
        aes_crypt(in, out, ctx->D, &ctx->cword.decrypt);
 }
 
@@ -524,6 +526,8 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
        struct blkcipher_walk walk;
        int err;
 
+       padlock_reset_key();
+
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);
 
@@ -546,6 +550,8 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
        struct blkcipher_walk walk;
        int err;
 
+       padlock_reset_key();
+
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);
 
@@ -590,6 +596,8 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
        struct blkcipher_walk walk;
        int err;
 
+       padlock_reset_key();
+
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);
 
@@ -614,6 +622,8 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
        struct blkcipher_walk walk;
        int err;
 
+       padlock_reset_key();
+
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);