thodg/libgit2

diff --git a/fuzzers/commit_graph_fuzzer.c b/fuzzers/commit_graph_fuzzer.c
index b41816e..39b5208 100644
--- a/fuzzers/commit_graph_fuzzer.c
+++ b/fuzzers/commit_graph_fuzzer.c
@@ -34,6 +34,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	git_commit_graph_file file = {{0}};
 	git_commit_graph_entry e;
 	git_buf commit_graph_buf = GIT_BUF_INIT;
+	unsigned char hash[GIT_HASH_SHA1_SIZE];
 	git_oid oid = {{0}};
 	bool append_hash = false;
 
@@ -50,14 +51,16 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	size -= 4;
 
 	if (append_hash) {
-		if (git_buf_init(&commit_graph_buf, size + sizeof(oid)) < 0)
+		if (git_buf_init(&commit_graph_buf, size + GIT_HASH_SHA1_SIZE) < 0)
 			goto cleanup;
-		if (git_hash_buf(&oid, data, size) < 0) {
+		if (git_hash_buf(hash, data, size, GIT_HASH_ALGORITHM_SHA1) < 0) {
 			fprintf(stderr, "Failed to compute the SHA1 hash\n");
 			abort();
 		}
 		memcpy(commit_graph_buf.ptr, data, size);
-		memcpy(commit_graph_buf.ptr + size, &oid, sizeof(oid));
+		memcpy(commit_graph_buf.ptr + size, hash, GIT_HASH_SHA1_SIZE);
+
+		memcpy(oid.id, hash, GIT_OID_RAWSZ);
 	} else {
 		git_buf_attach_notowned(&commit_graph_buf, (char *)data, size);
 	}
diff --git a/fuzzers/midx_fuzzer.c b/fuzzers/midx_fuzzer.c
index e67873f..9739f0a 100644
--- a/fuzzers/midx_fuzzer.c
+++ b/fuzzers/midx_fuzzer.c
@@ -34,6 +34,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	git_midx_file idx = {{0}};
 	git_midx_entry e;
 	git_buf midx_buf = GIT_BUF_INIT;
+	unsigned char hash[GIT_HASH_SHA1_SIZE];
 	git_oid oid = {{0}};
 	bool append_hash = false;
 
@@ -50,14 +51,16 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	size -= 4;
 
 	if (append_hash) {
-		if (git_buf_init(&midx_buf, size + sizeof(oid)) < 0)
+		if (git_buf_init(&midx_buf, size + GIT_HASH_SHA1_SIZE) < 0)
 			goto cleanup;
-		if (git_hash_buf(&oid, data, size) < 0) {
+		if (git_hash_buf(hash, data, size, GIT_HASH_ALGORITHM_SHA1) < 0) {
 			fprintf(stderr, "Failed to compute the SHA1 hash\n");
 			abort();
 		}
 		memcpy(midx_buf.ptr, data, size);
-		memcpy(midx_buf.ptr + size, &oid, sizeof(oid));
+		memcpy(midx_buf.ptr + size, hash, GIT_HASH_SHA1_SIZE);
+
+		memcpy(oid.id, hash, GIT_OID_RAWSZ);
 	} else {
 		git_buf_attach_notowned(&midx_buf, (char *)data, size);
 	}