summaryrefslogtreecommitdiff
path: root/drivers/crypto/padlock-sha.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/crypto/padlock-sha.c')
-rw-r--r--drivers/crypto/padlock-sha.c333
1 files changed, 155 insertions, 178 deletions
diff --git a/drivers/crypto/padlock-sha.c b/drivers/crypto/padlock-sha.c
index 868da54b1850..fb6e6c343148 100644
--- a/drivers/crypto/padlock-sha.c
+++ b/drivers/crypto/padlock-sha.c
@@ -24,73 +24,31 @@
#include <asm/i387.h>
#include "padlock.h"
-struct padlock_sha_ctx {
- char *data;
- size_t used;
- int bypass;
- void (*f_sha_padlock)(const char *in, char *out, int count);
- struct shash_desc *fallback;
+struct padlock_sha_desc {
+ struct shash_desc fallback;
};
-static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
-{
- return crypto_tfm_ctx(tfm);
-}
-
-/* We'll need aligned address on the stack */
-#define NEAREST_ALIGNED(ptr) \
- ((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
-
-static struct crypto_alg sha1_alg, sha256_alg;
+struct padlock_sha_ctx {
+ struct crypto_shash *fallback;
+};
-static int padlock_sha_bypass(struct crypto_tfm *tfm)
+static int padlock_sha_init(struct shash_desc *desc)
{
- int err = 0;
-
- if (ctx(tfm)->bypass)
- goto out;
+ struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
+ struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
- err = crypto_shash_init(ctx(tfm)->fallback);
- if (err)
- goto out;
-
- if (ctx(tfm)->data && ctx(tfm)->used)
- err = crypto_shash_update(ctx(tfm)->fallback, ctx(tfm)->data,
- ctx(tfm)->used);
-
- ctx(tfm)->used = 0;
- ctx(tfm)->bypass = 1;
-
-out:
- return err;
+ dctx->fallback.tfm = ctx->fallback;
+ dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ return crypto_shash_init(&dctx->fallback);
}
-static void padlock_sha_init(struct crypto_tfm *tfm)
+static int padlock_sha_update(struct shash_desc *desc,
+ const u8 *data, unsigned int length)
{
- ctx(tfm)->used = 0;
- ctx(tfm)->bypass = 0;
-}
+ struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
-static void padlock_sha_update(struct crypto_tfm *tfm,
- const uint8_t *data, unsigned int length)
-{
- int err;
-
- /* Our buffer is always one page. */
- if (unlikely(!ctx(tfm)->bypass &&
- (ctx(tfm)->used + length > PAGE_SIZE))) {
- err = padlock_sha_bypass(tfm);
- BUG_ON(err);
- }
-
- if (unlikely(ctx(tfm)->bypass)) {
- err = crypto_shash_update(ctx(tfm)->fallback, data, length);
- BUG_ON(err);
- return;
- }
-
- memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
- ctx(tfm)->used += length;
+ dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ return crypto_shash_update(&dctx->fallback, data, length);
}
static inline void padlock_output_block(uint32_t *src,
@@ -100,88 +58,138 @@ static inline void padlock_output_block(uint32_t *src,
*dst++ = swab32(*src++);
}
-static void padlock_do_sha1(const char *in, char *out, int count)
+static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
+ unsigned int count, u8 *out)
{
/* We can't store directly to *out as it may be unaligned. */
/* BTW Don't reduce the buffer size below 128 Bytes!
* PadLock microcode needs it that big. */
- char buf[128+16];
- char *result = NEAREST_ALIGNED(buf);
+ char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
+ struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
+ struct sha1_state state;
+ unsigned int space;
+ unsigned int leftover;
int ts_state;
+ int err;
+
+ dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ err = crypto_shash_export(&dctx->fallback, &state);
+ if (err)
+ goto out;
+
+ if (state.count + count > ULONG_MAX)
+ return crypto_shash_finup(&dctx->fallback, in, count, out);
+
+ leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
+ space = SHA1_BLOCK_SIZE - leftover;
+ if (space) {
+ if (count > space) {
+ err = crypto_shash_update(&dctx->fallback, in, space) ?:
+ crypto_shash_export(&dctx->fallback, &state);
+ if (err)
+ goto out;
+ count -= space;
+ in += space;
+ } else {
+ memcpy(state.buffer + leftover, in, count);
+ in = state.buffer;
+ count += leftover;
+ }
+ }
+
+ memcpy(result, &state.state, SHA1_DIGEST_SIZE);
- ((uint32_t *)result)[0] = SHA1_H0;
- ((uint32_t *)result)[1] = SHA1_H1;
- ((uint32_t *)result)[2] = SHA1_H2;
- ((uint32_t *)result)[3] = SHA1_H3;
- ((uint32_t *)result)[4] = SHA1_H4;
-
/* prevent taking the spurious DNA fault with padlock. */
ts_state = irq_ts_save();
asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
- : "+S"(in), "+D"(result)
- : "c"(count), "a"(0));
+ : \
+ : "c"(state.count + count), "a"(state.count), \
+ "S"(in), "D"(result));
irq_ts_restore(ts_state);
padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
+
+out:
+ return err;
}
-static void padlock_do_sha256(const char *in, char *out, int count)
+static int padlock_sha1_final(struct shash_desc *desc, u8 *out)
+{
+ u8 buf[4];
+
+ return padlock_sha1_finup(desc, buf, 0, out);
+}
+
+static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in,
+ unsigned int count, u8 *out)
{
/* We can't store directly to *out as it may be unaligned. */
/* BTW Don't reduce the buffer size below 128 Bytes!
* PadLock microcode needs it that big. */
- char buf[128+16];
- char *result = NEAREST_ALIGNED(buf);
+ char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
+ struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
+ struct sha256_state state;
+ unsigned int space;
+ unsigned int leftover;
int ts_state;
+ int err;
- ((uint32_t *)result)[0] = SHA256_H0;
- ((uint32_t *)result)[1] = SHA256_H1;
- ((uint32_t *)result)[2] = SHA256_H2;
- ((uint32_t *)result)[3] = SHA256_H3;
- ((uint32_t *)result)[4] = SHA256_H4;
- ((uint32_t *)result)[5] = SHA256_H5;
- ((uint32_t *)result)[6] = SHA256_H6;
- ((uint32_t *)result)[7] = SHA256_H7;
+ dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ err = crypto_shash_export(&dctx->fallback, &state);
+ if (err)
+ goto out;
+
+ if (state.count + count > ULONG_MAX)
+ return crypto_shash_finup(&dctx->fallback, in, count, out);
+
+ leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
+ space = SHA256_BLOCK_SIZE - leftover;
+ if (space) {
+ if (count > space) {
+ err = crypto_shash_update(&dctx->fallback, in, space) ?:
+ crypto_shash_export(&dctx->fallback, &state);
+ if (err)
+ goto out;
+ count -= space;
+ in += space;
+ } else {
+ memcpy(state.buf + leftover, in, count);
+ in = state.buf;
+ count += leftover;
+ }
+ }
+
+ memcpy(result, &state.state, SHA256_DIGEST_SIZE);
/* prevent taking the spurious DNA fault with padlock. */
ts_state = irq_ts_save();
asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
- : "+S"(in), "+D"(result)
- : "c"(count), "a"(0));
+ : \
+ : "c"(state.count + count), "a"(state.count), \
+ "S"(in), "D"(result));
irq_ts_restore(ts_state);
padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
+
+out:
+ return err;
}
-static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out)
+static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
{
- int err;
-
- if (unlikely(ctx(tfm)->bypass)) {
- err = crypto_shash_final(ctx(tfm)->fallback, out);
- BUG_ON(err);
- ctx(tfm)->bypass = 0;
- return;
- }
+ u8 buf[4];
- /* Pass the input buffer to PadLock microcode... */
- ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);
-
- ctx(tfm)->used = 0;
+ return padlock_sha256_finup(desc, buf, 0, out);
}
static int padlock_cra_init(struct crypto_tfm *tfm)
{
+ struct crypto_shash *hash = __crypto_shash_cast(tfm);
const char *fallback_driver_name = tfm->__crt_alg->cra_name;
+ struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_shash *fallback_tfm;
int err = -ENOMEM;
- /* For now we'll allocate one page. This
- * could eventually be configurable one day. */
- ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
- if (!ctx(tfm)->data)
- goto out;
-
/* Allocate a fallback and abort if it failed. */
fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
CRYPTO_ALG_NEED_FALLBACK);
@@ -189,94 +197,63 @@ static int padlock_cra_init(struct crypto_tfm *tfm)
printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
fallback_driver_name);
err = PTR_ERR(fallback_tfm);
- goto out_free_page;
+ goto out;
}
- ctx(tfm)->fallback = kmalloc(sizeof(struct shash_desc) +
- crypto_shash_descsize(fallback_tfm),
- GFP_KERNEL);
- if (!ctx(tfm)->fallback)
- goto out_free_tfm;
-
- ctx(tfm)->fallback->tfm = fallback_tfm;
- ctx(tfm)->fallback->flags = 0;
+ ctx->fallback = fallback_tfm;
+ hash->descsize += crypto_shash_descsize(fallback_tfm);
return 0;
-out_free_tfm:
- crypto_free_shash(fallback_tfm);
-out_free_page:
- free_page((unsigned long)(ctx(tfm)->data));
out:
return err;
}
-static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
-{
- ctx(tfm)->f_sha_padlock = padlock_do_sha1;
-
- return padlock_cra_init(tfm);
-}
-
-static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
-{
- ctx(tfm)->f_sha_padlock = padlock_do_sha256;
-
- return padlock_cra_init(tfm);
-}
-
static void padlock_cra_exit(struct crypto_tfm *tfm)
{
- if (ctx(tfm)->data) {
- free_page((unsigned long)(ctx(tfm)->data));
- ctx(tfm)->data = NULL;
- }
-
- crypto_free_shash(ctx(tfm)->fallback->tfm);
+ struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
- kzfree(ctx(tfm)->fallback);
+ crypto_free_shash(ctx->fallback);
}
-static struct crypto_alg sha1_alg = {
- .cra_name = "sha1",
- .cra_driver_name = "sha1-padlock",
- .cra_priority = PADLOCK_CRA_PRIORITY,
- .cra_flags = CRYPTO_ALG_TYPE_DIGEST |
- CRYPTO_ALG_NEED_FALLBACK,
- .cra_blocksize = SHA1_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct padlock_sha_ctx),
- .cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(sha1_alg.cra_list),
- .cra_init = padlock_sha1_cra_init,
- .cra_exit = padlock_cra_exit,
- .cra_u = {
- .digest = {
- .dia_digestsize = SHA1_DIGEST_SIZE,
- .dia_init = padlock_sha_init,
- .dia_update = padlock_sha_update,
- .dia_final = padlock_sha_final,
- }
+static struct shash_alg sha1_alg = {
+ .digestsize = SHA1_DIGEST_SIZE,
+ .init = padlock_sha_init,
+ .update = padlock_sha_update,
+ .finup = padlock_sha1_finup,
+ .final = padlock_sha1_final,
+ .descsize = sizeof(struct padlock_sha_desc),
+ .base = {
+ .cra_name = "sha1",
+ .cra_driver_name = "sha1-padlock",
+ .cra_priority = PADLOCK_CRA_PRIORITY,
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct padlock_sha_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = padlock_cra_init,
+ .cra_exit = padlock_cra_exit,
}
};
-static struct crypto_alg sha256_alg = {
- .cra_name = "sha256",
- .cra_driver_name = "sha256-padlock",
- .cra_priority = PADLOCK_CRA_PRIORITY,
- .cra_flags = CRYPTO_ALG_TYPE_DIGEST |
- CRYPTO_ALG_NEED_FALLBACK,
- .cra_blocksize = SHA256_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct padlock_sha_ctx),
- .cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(sha256_alg.cra_list),
- .cra_init = padlock_sha256_cra_init,
- .cra_exit = padlock_cra_exit,
- .cra_u = {
- .digest = {
- .dia_digestsize = SHA256_DIGEST_SIZE,
- .dia_init = padlock_sha_init,
- .dia_update = padlock_sha_update,
- .dia_final = padlock_sha_final,
- }
+static struct shash_alg sha256_alg = {
+ .digestsize = SHA256_DIGEST_SIZE,
+ .init = padlock_sha_init,
+ .update = padlock_sha_update,
+ .finup = padlock_sha256_finup,
+ .final = padlock_sha256_final,
+ .descsize = sizeof(struct padlock_sha_desc),
+ .base = {
+ .cra_name = "sha256",
+ .cra_driver_name = "sha256-padlock",
+ .cra_priority = PADLOCK_CRA_PRIORITY,
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct padlock_sha_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = padlock_cra_init,
+ .cra_exit = padlock_cra_exit,
}
};
@@ -294,11 +271,11 @@ static int __init padlock_init(void)
return -ENODEV;
}
- rc = crypto_register_alg(&sha1_alg);
+ rc = crypto_register_shash(&sha1_alg);
if (rc)
goto out;
- rc = crypto_register_alg(&sha256_alg);
+ rc = crypto_register_shash(&sha256_alg);
if (rc)
goto out_unreg1;
@@ -307,7 +284,7 @@ static int __init padlock_init(void)
return 0;
out_unreg1:
- crypto_unregister_alg(&sha1_alg);
+ crypto_unregister_shash(&sha1_alg);
out:
printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
return rc;
@@ -315,8 +292,8 @@ out:
static void __exit padlock_fini(void)
{
- crypto_unregister_alg(&sha1_alg);
- crypto_unregister_alg(&sha256_alg);
+ crypto_unregister_shash(&sha1_alg);
+ crypto_unregister_shash(&sha256_alg);
}
module_init(padlock_init);