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path: root/drivers/crypto/padlock-aes.c
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Diffstat (limited to 'drivers/crypto/padlock-aes.c')
-rw-r--r--drivers/crypto/padlock-aes.c52
1 files changed, 42 insertions, 10 deletions
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index bf2917d197a..856b3cc2558 100644
--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -15,6 +15,8 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
#include <asm/byteorder.h>
#include <asm/i387.h>
#include "padlock.h"
@@ -49,6 +51,8 @@ struct aes_ctx {
u32 *D;
};
+static DEFINE_PER_CPU(struct cword *, last_cword);
+
/* Tells whether the ACE is capable to generate
the extended key for a given key_len. */
static inline int
@@ -89,6 +93,7 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
const __le32 *key = (const __le32 *)in_key;
u32 *flags = &tfm->crt_flags;
struct crypto_aes_ctx gen_aes;
+ int cpu;
if (key_len % 8) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
@@ -118,7 +123,7 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
/* Don't generate extended keys if the hardware can do it. */
if (aes_hw_extkey_available(key_len))
- return 0;
+ goto ok;
ctx->D = ctx->d_data;
ctx->cword.encrypt.keygen = 1;
@@ -131,15 +136,30 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
memcpy(ctx->E, gen_aes.key_enc, AES_MAX_KEYLENGTH);
memcpy(ctx->D, gen_aes.key_dec, AES_MAX_KEYLENGTH);
+
+ok:
+ for_each_online_cpu(cpu)
+ if (&ctx->cword.encrypt == per_cpu(last_cword, cpu) ||
+ &ctx->cword.decrypt == per_cpu(last_cword, cpu))
+ per_cpu(last_cword, cpu) = NULL;
+
return 0;
}
/* ====== Encryption/decryption routines ====== */
/* These are the real call to PadLock. */
-static inline void padlock_reset_key(void)
+static inline void padlock_reset_key(struct cword *cword)
+{
+ int cpu = raw_smp_processor_id();
+
+ if (cword != per_cpu(last_cword, cpu))
+ asm volatile ("pushfl; popfl");
+}
+
+static inline void padlock_store_cword(struct cword *cword)
{
- asm volatile ("pushfl; popfl");
+ per_cpu(last_cword, raw_smp_processor_id()) = cword;
}
/*
@@ -149,7 +169,7 @@ static inline void padlock_reset_key(void)
*/
static inline void padlock_xcrypt(const u8 *input, u8 *output, void *key,
- void *control_word)
+ struct cword *control_word)
{
asm volatile (".byte 0xf3,0x0f,0xa7,0xc8" /* rep xcryptecb */
: "+S"(input), "+D"(output)
@@ -213,22 +233,24 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aes_ctx *ctx = aes_ctx(tfm);
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
ts_state = irq_ts_save();
aes_crypt(in, out, ctx->E, &ctx->cword.encrypt);
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.encrypt);
}
static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aes_ctx *ctx = aes_ctx(tfm);
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
ts_state = irq_ts_save();
aes_crypt(in, out, ctx->D, &ctx->cword.decrypt);
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.encrypt);
}
static struct crypto_alg aes_alg = {
@@ -261,7 +283,7 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -276,6 +298,8 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
}
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.encrypt);
+
return err;
}
@@ -288,7 +312,7 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.decrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -302,6 +326,9 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
err = blkcipher_walk_done(desc, &walk, nbytes);
}
irq_ts_restore(ts_state);
+
+ padlock_store_cword(&ctx->cword.encrypt);
+
return err;
}
@@ -336,7 +363,7 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -353,6 +380,8 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
}
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.decrypt);
+
return err;
}
@@ -365,7 +394,7 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -380,6 +409,9 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
}
irq_ts_restore(ts_state);
+
+ padlock_store_cword(&ctx->cword.encrypt);
+
return err;
}