[PATCH ima-evm-utils v2 1/9] Fix error messages and mdlen init in calc_evm_hmac()

[Roberto Sassu <roberto.sassu@xxxxxxxxxxxxxxx>]

From: Roberto Sassu <roberto.sassu@xxxxxxxxxx>

Make sure that the function name in the error message corresponds to the
actual function called. Also, initialize mdlen to the size of 'hash'
(MAX_DIGEST_SIZE), as this is expected by EVP_DigestSignFinal().

Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
---
 src/evmctl.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/evmctl.c b/src/evmctl.c
index 0ac7930da6f2..d4912d7ee891 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -1186,7 +1186,7 @@ static int cmd_setxattr_ima(struct command *cmd)
 
 static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *hash)
 {
-	size_t mdlen;
+	size_t mdlen = MAX_DIGEST_SIZE;
 	EVP_MD_CTX *pctx;
 	EVP_PKEY *pkey = NULL;
 	struct stat st;
@@ -1260,7 +1260,7 @@ static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *h
 
 	pkey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, evmkey, sizeof(evmkey));
 	if (!pkey) {
-		log_err("HMAC_Init() failed\n");
+		log_err("EVP_PKEY_new_mac_key() failed\n");
 		goto out;
 	}
 
@@ -1326,12 +1326,12 @@ static int calc_evm_hmac(const char *file, const char *keyfile, unsigned char *h
 
 	err = EVP_DigestSignUpdate(pctx, &hmac_misc, hmac_size);
 	if (err != 1) {
-		log_err("HMAC_Update() failed\n");
+		log_err("EVP_DigestSignUpdate() failed\n");
 		goto out_ctx_cleanup;
 	}
 	err = EVP_DigestSignFinal(pctx, hash, &mdlen);
 	if (err != 1)
-		log_err("HMAC_Final() failed\n");
+		log_err("EVP_DigestSignFinal() failed\n");
 out_ctx_cleanup:
 	EVP_PKEY_free(pkey);
 #if OPENSSL_VERSION_NUMBER >= 0x10100000
-- 
2.25.1