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Subject[PATCH] keys, trusted: select TPM2 hash algorithm
Date
Added 'hashalg=' option for selecting the hash algorithm.

Currently available options are:

* sha1
* sha256
* sha384
* sha512
* sm3_256

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
drivers/char/tpm/tpm.h | 5 ++++-
drivers/char/tpm/tpm2-cmd.c | 34 ++++++++++++++++++++++++++++++++++
include/keys/trusted-type.h | 2 ++
security/keys/trusted.c | 8 +++++++-
4 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index a4257a3..4c18f46 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -92,7 +92,10 @@ enum tpm2_algorithms {
TPM2_ALG_SHA1 = 0x0004,
TPM2_ALG_KEYEDHASH = 0x0008,
TPM2_ALG_SHA256 = 0x000B,
- TPM2_ALG_NULL = 0x0010
+ TPM2_ALG_SHA384 = 0x000C,
+ TPM2_ALG_SHA512 = 0x000D,
+ TPM2_ALG_NULL = 0x0010,
+ TPM2_ALG_SM3_256 = 0x0012,
};

enum tpm2_command_codes {
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index bd7039f..0704bd6 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -104,6 +104,22 @@ struct tpm2_cmd {
union tpm2_cmd_params params;
} __packed;

+struct tpm2_hashalg {
+ char name[MAX_HASHALG_SIZE];
+ u32 id;
+};
+
+struct tpm2_hashalg tpm2_hashalg_map[] = {
+ {"sha1", TPM2_ALG_SHA1},
+ {"sha256", TPM2_ALG_SHA256},
+ {"sm3_256", TPM2_ALG_SM3_256},
+ {"sha384", TPM2_ALG_SHA384},
+ {"sha512", TPM2_ALG_SHA512},
+};
+
+#define TPM2_HASHALG_COUNT \
+ (sizeof(tpm2_hashalg_map) / sizeof(tpm2_hashalg_map[1]))
+
/*
* Array with one entry per ordinal defining the maximum amount
* of time the chip could take to return the result. The values
@@ -429,8 +445,26 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
{
unsigned int blob_len;
struct tpm_buf buf;
+ u32 hashalg = TPM2_ALG_SHA256;
+ int i;
int rc;

+ if (strlen(options->hashalg) > 0) {
+ for (i = 0; i < TPM2_HASHALG_COUNT; i++) {
+ if (!strcmp(options->hashalg,
+ tpm2_hashalg_map[i].name)) {
+ hashalg = tpm2_hashalg_map[i].id;
+ dev_dbg(chip->pdev, "%s: hashalg: %s 0x%08X\n",
+ __func__, tpm2_hashalg_map[i].name,
+ hashalg);
+ break;
+ }
+ }
+
+ if (i == TPM2_HASHALG_COUNT)
+ return -EINVAL;
+ }
+
rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
if (rc)
return rc;
diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h
index f91ecd9..a545733 100644
--- a/include/keys/trusted-type.h
+++ b/include/keys/trusted-type.h
@@ -18,6 +18,7 @@
#define MAX_KEY_SIZE 128
#define MAX_BLOB_SIZE 512
#define MAX_PCRINFO_SIZE 64
+#define MAX_HASHALG_SIZE 16

struct trusted_key_payload {
struct rcu_head rcu;
@@ -36,6 +37,7 @@ struct trusted_key_options {
uint32_t pcrinfo_len;
unsigned char pcrinfo[MAX_PCRINFO_SIZE];
int pcrlock;
+ unsigned char hashalg[MAX_HASHALG_SIZE];
};

extern struct key_type key_type_trusted;
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index d3633cf..9e7564d 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -710,7 +710,8 @@ enum {
Opt_err = -1,
Opt_new, Opt_load, Opt_update,
Opt_keyhandle, Opt_keyauth, Opt_blobauth,
- Opt_pcrinfo, Opt_pcrlock, Opt_migratable
+ Opt_pcrinfo, Opt_pcrlock, Opt_migratable,
+ Opt_hashalg,
};

static const match_table_t key_tokens = {
@@ -723,6 +724,7 @@ static const match_table_t key_tokens = {
{Opt_pcrinfo, "pcrinfo=%s"},
{Opt_pcrlock, "pcrlock=%s"},
{Opt_migratable, "migratable=%s"},
+ {Opt_hashalg, "hashalg=%s"},
{Opt_err, NULL}
};

@@ -787,6 +789,10 @@ static int getoptions(char *c, struct trusted_key_payload *pay,
return -EINVAL;
opt->pcrlock = lock;
break;
+ case Opt_hashalg:
+ strncpy(opt->hashalg, args[0].from,
+ MAX_HASHALG_SIZE - 1);
+ break;
default:
return -EINVAL;
}
--
2.5.0


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