[LTP] [PATCH 2/6] ima/ima_boot_aggregate: Don't hard code the length of sha1 hash

[Jia Zhang]

Instead, use SHA_DIGEST_LENGTH.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
---
 testcases/kernel/security/integrity/ima/src/ima_boot_aggregate.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/testcases/kernel/security/integrity/ima/src/ima_boot_aggregate.c b/testcases/kernel/security/integrity/ima/src/ima_boot_aggregate.c
index d85d222..67be6a7 100644
--- a/testcases/kernel/security/integrity/ima/src/ima_boot_aggregate.c
+++ b/testcases/kernel/security/integrity/ima/src/ima_boot_aggregate.c
@@ -42,7 +42,7 @@ static void display_sha1_digest(unsigned char *pcr)
 {
 	int i;
 
-	for (i = 0; i < 20; i++)
+	for (i = 0; i < SHA_DIGEST_LENGTH; i++)
 		printf("%02x", *(pcr + i) & 0xff);
 	printf("\n");
 }
@@ -94,8 +94,9 @@ int main(int argc, char *argv[])
 			display_sha1_digest(event.header.digest);
 		}
 		SHA1_Init(&c);
-		SHA1_Update(&c, pcr[event.header.pcr].digest, 20);
-		SHA1_Update(&c, event.header.digest, 20);
+		SHA1_Update(&c, pcr[event.header.pcr].digest,
+			    SHA_DIGEST_LENGTH);
+		SHA1_Update(&c, event.header.digest, SHA_DIGEST_LENGTH);
 		SHA1_Final(pcr[event.header.pcr].digest, &c);
 #if MAX_EVENT_DATA_SIZE < USHRT_MAX
 		if (event.header.len > MAX_EVENT_DATA_SIZE) {
@@ -116,7 +117,7 @@ int main(int argc, char *argv[])
 			printf("PCR-%2.2x: ", i);
 			display_sha1_digest(pcr[i].digest);
 		}
-		SHA1_Update(&c, pcr[i].digest, 20);
+		SHA1_Update(&c, pcr[i].digest, SHA_DIGEST_LENGTH);
 	}
 	SHA1_Final(boot_aggregate, &c);
 
-- 
1.8.3.1