[ima-evm-utils PATCH v3 08/13] Define library ima_calc_hash2() function with a hash algorithm parameter

[Mimi Zohar <zohar@xxxxxxxxxxxxx>]

Instead of relying on the "imaevm_params.algo" global variable, which
is not concurrency-safe, define a new library ima_calc_hash2() function
with the hash algorithm as a parameter.

To avoid library incompatibility, make the existing ima_calc_hash()
function a wrapper for ima_calc_hash2().

Deprecate ima_calc_hash().

Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
---
 src/imaevm.h    |  3 ++-
 src/libimaevm.c | 12 ++++++++----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/imaevm.h b/src/imaevm.h
index 0b86d28944b3..8e24f08bbddc 100644
--- a/src/imaevm.h
+++ b/src/imaevm.h
@@ -243,7 +243,6 @@ struct public_key_entry;
 
 void imaevm_do_hexdump(FILE *fp, const void *ptr, int len, bool cr);
 void imaevm_hexdump(const void *ptr, int len);
-int ima_calc_hash(const char *file, uint8_t *hash);
 int imaevm_get_hash_algo(const char *algo);
 RSA *read_pub_key(const char *keyfile, int x509);
 EVP_PKEY *read_pub_pkey(const char *keyfile, int x509);
@@ -254,6 +253,7 @@ int key2bin(RSA *key, unsigned char *pub);
 uint32_t imaevm_read_keyid(const char *certfile);
 
 int sign_hash(const char *algo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig);
+IMAEVM_DEPRECATED int ima_calc_hash(const char *file, uint8_t *hash);
 IMAEVM_DEPRECATED int verify_hash(const char *file, const unsigned char *hash,
 				  int size, unsigned char *sig, int siglen);
 IMAEVM_DEPRECATED int ima_verify_signature(const char *file, unsigned char *sig,
@@ -261,6 +261,7 @@ IMAEVM_DEPRECATED int ima_verify_signature(const char *file, unsigned char *sig,
 					   int digestlen);
 IMAEVM_DEPRECATED void init_public_keys(const char *keyfiles);
 
+int ima_calc_hash2(const char *file, const char *hash_algo, uint8_t *hash);
 int imaevm_verify_hash(struct public_key_entry *public_keys, const char *file,
 		       const char *hash_algo, const unsigned char *hash,
 		       int size, unsigned char *sig, int siglen);
diff --git a/src/libimaevm.c b/src/libimaevm.c
index a5e9fd5080ac..214c656d6eba 100644
--- a/src/libimaevm.c
+++ b/src/libimaevm.c
@@ -181,7 +181,7 @@ out:
 	return err;
 }
 
-int ima_calc_hash(const char *file, uint8_t *hash)
+int ima_calc_hash2(const char *file, const char *hash_algo, uint8_t *hash)
 {
 	const EVP_MD *md;
 	struct stat st;
@@ -202,10 +202,9 @@ int ima_calc_hash(const char *file, uint8_t *hash)
 		goto err;
 	}
 
-	md = EVP_get_digestbyname(imaevm_params.hash_algo);
+	md = EVP_get_digestbyname(hash_algo);
 	if (!md) {
-		log_err("EVP_get_digestbyname(%s) failed\n",
-			imaevm_params.hash_algo);
+		log_err("EVP_get_digestbyname(%s) failed\n", hash_algo);
 		err = 1;
 		goto err;
 	}
@@ -246,6 +245,11 @@ err:
 	return err;
 }
 
+int ima_calc_hash(const char *file, uint8_t *hash)
+{
+	return ima_calc_hash2(file, imaevm_params.hash_algo, hash);
+}
+
 EVP_PKEY *read_pub_pkey(const char *keyfile, int x509)
 {
 	FILE *fp;
-- 
2.39.3