tpm: rename and export tpm2_digest and tpm2_algorithms

Rename tpm2_* to tpm_* and move the definitions to include/linux/tpm.h so
that these can be used by other kernel subsystems (e.g. IMA).

Also, set the length of the digest array in tpm_digest to a new constant
named TPM_MAX_DIGEST_SIZE, equal to SHA512_DIGEST_SIZE.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

6 files changed, 33 insertions, 30 deletions

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 2b31eff06b0e..9c6aa77b5dee 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -318,7 +318,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read);
 int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash)
 {
         int rc;
-        struct tpm2_digest *digest_list;
+        struct tpm_digest *digest_list;
         int i;
 
         chip = tpm_find_get_ops(chip);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index cd330ace6248..0e54061d3fd1 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -122,17 +122,6 @@ enum tpm2_return_codes {
         TPM2_RC_RETRY           = 0x0922,
 };
 
-enum tpm2_algorithms {
-        TPM2_ALG_ERROR          = 0x0000,
-        TPM2_ALG_SHA1           = 0x0004,
-        TPM2_ALG_KEYEDHASH      = 0x0008,
-        TPM2_ALG_SHA256         = 0x000B,
-        TPM2_ALG_SHA384         = 0x000C,
-        TPM2_ALG_SHA512         = 0x000D,
-        TPM2_ALG_NULL           = 0x0010,
-        TPM2_ALG_SM3_256        = 0x0012,
-};
-
 enum tpm2_command_codes {
         TPM2_CC_FIRST                   = 0x011F,
         TPM2_CC_HIERARCHY_CONTROL       = 0x0121,
@@ -545,7 +534,7 @@ static inline u32 tpm2_rc_value(u32 rc)
 int tpm2_get_timeouts(struct tpm_chip *chip);
 int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
 int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, u32 count,
-                    struct tpm2_digest *digests);
+                    struct tpm_digest *digests);
 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max);
 void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
 int tpm2_seal_trusted(struct tpm_chip *chip,
diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
index e7d3228a0f37..3eb7e03889a0 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -703,7 +703,7 @@ int tpm1_auto_startup(struct tpm_chip *chip)
                 goto out;
         }
 
-        chip->allocated_banks[0] = TPM2_ALG_SHA1;
+        chip->allocated_banks[0] = TPM_ALG_SHA1;
         chip->nr_allocated_banks = 1;
 
         return rc;
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index bd20b9a61fc0..440ae6ee29e4 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -33,11 +33,11 @@ struct tpm2_hash {
 };
 
 static struct tpm2_hash tpm2_hash_map[] = {
-        {HASH_ALGO_SHA1, TPM2_ALG_SHA1},
-        {HASH_ALGO_SHA256, TPM2_ALG_SHA256},
-        {HASH_ALGO_SHA384, TPM2_ALG_SHA384},
-        {HASH_ALGO_SHA512, TPM2_ALG_SHA512},
-        {HASH_ALGO_SM3_256, TPM2_ALG_SM3_256},
+        {HASH_ALGO_SHA1, TPM_ALG_SHA1},
+        {HASH_ALGO_SHA256, TPM_ALG_SHA256},
+        {HASH_ALGO_SHA384, TPM_ALG_SHA384},
+        {HASH_ALGO_SHA512, TPM_ALG_SHA512},
+        {HASH_ALGO_SM3_256, TPM_ALG_SM3_256},
 };
 
 int tpm2_get_timeouts(struct tpm_chip *chip)
@@ -192,7 +192,7 @@ int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
         pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
 
         tpm_buf_append_u32(&buf, 1);
-        tpm_buf_append_u16(&buf, TPM2_ALG_SHA1);
+        tpm_buf_append_u16(&buf, TPM_ALG_SHA1);
         tpm_buf_append_u8(&buf, TPM2_PCR_SELECT_MIN);
         tpm_buf_append(&buf, (const unsigned char *)pcr_select,
                        sizeof(pcr_select));
@@ -226,7 +226,7 @@ struct tpm2_null_auth_area {
  * Return: Same as with tpm_transmit_cmd.
  */
 int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, u32 count,
-                    struct tpm2_digest *digests)
+                    struct tpm_digest *digests)
 {
         struct tpm_buf buf;
         struct tpm2_null_auth_area auth_area;
@@ -443,7 +443,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
 
         /* public */
         tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
-        tpm_buf_append_u16(&buf, TPM2_ALG_KEYEDHASH);
+        tpm_buf_append_u16(&buf, TPM_ALG_KEYEDHASH);
         tpm_buf_append_u16(&buf, hash);
 
         /* policy */
@@ -458,7 +458,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
         }
 
         /* public parameters */
-        tpm_buf_append_u16(&buf, TPM2_ALG_NULL);
+        tpm_buf_append_u16(&buf, TPM_ALG_NULL);
         tpm_buf_append_u16(&buf, 0);
 
         /* outside info */
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 13563b8c0c3a..9fe8c9816cf0 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -22,12 +22,31 @@
 #ifndef __LINUX_TPM_H__
 #define __LINUX_TPM_H__
 
+#include <crypto/hash_info.h>
+
 #define TPM_DIGEST_SIZE 20      /* Max TPM v1.2 PCR size */
+#define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
 
 struct tpm_chip;
 struct trusted_key_payload;
 struct trusted_key_options;
 
+enum tpm_algorithms {
+        TPM_ALG_ERROR           = 0x0000,
+        TPM_ALG_SHA1            = 0x0004,
+        TPM_ALG_KEYEDHASH       = 0x0008,
+        TPM_ALG_SHA256          = 0x000B,
+        TPM_ALG_SHA384          = 0x000C,
+        TPM_ALG_SHA512          = 0x000D,
+        TPM_ALG_NULL            = 0x0010,
+        TPM_ALG_SM3_256         = 0x0012,
+};
+
+struct tpm_digest {
+        u16 alg_id;
+        u8 digest[TPM_MAX_DIGEST_SIZE];
+} __packed;
+
 enum TPM_OPS_FLAGS {
         TPM_OPS_AUTO_STARTUP = BIT(0),
 };
diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
index f47342361e87..81519f163211 100644
--- a/include/linux/tpm_eventlog.h
+++ b/include/linux/tpm_eventlog.h
@@ -3,7 +3,7 @@
 #ifndef __LINUX_TPM_EVENTLOG_H__
 #define __LINUX_TPM_EVENTLOG_H__
 
-#include <crypto/hash_info.h>
+#include <linux/tpm.h>
 
 #define TCG_EVENT_NAME_LEN_MAX  255
 #define MAX_TEXT_EVENT          1000    /* Max event string length */
@@ -105,16 +105,11 @@ struct tcg_event_field {
         u8 event[0];
 } __packed;
 
-struct tpm2_digest {
-        u16 alg_id;
-        u8 digest[SHA512_DIGEST_SIZE];
-} __packed;
-
 struct tcg_pcr_event2_head {
         u32 pcr_idx;
         u32 event_type;
         u32 count;
-        struct tpm2_digest digests[];
+        struct tpm_digest digests[];
 } __packed;
 
 #endif