1 files changed, 61 insertions, 0 deletions
diff --git a/src/util/hash.h b/src/util/hash.h
new file mode 100644
index 0000000..21fcaf0
--- /dev/null
+++ b/src/util/hash.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_hash_h__
+#define INCLUDE_hash_h__
+
+#include "git2_util.h"
+
+#include "hash/sha.h"
+
+typedef struct {
+	void *data;
+	size_t len;
+} git_str_vec;
+
+typedef enum {
+	GIT_HASH_ALGORITHM_NONE = 0,
+	GIT_HASH_ALGORITHM_SHA1,
+	GIT_HASH_ALGORITHM_SHA256
+} git_hash_algorithm_t;
+
+#define GIT_HASH_MAX_SIZE GIT_HASH_SHA256_SIZE
+
+typedef struct git_hash_ctx {
+	union {
+		git_hash_sha1_ctx sha1;
+		git_hash_sha256_ctx sha256;
+	} ctx;
+	git_hash_algorithm_t algorithm;
+} git_hash_ctx;
+
+int git_hash_global_init(void);
+
+int git_hash_ctx_init(git_hash_ctx *ctx, git_hash_algorithm_t algorithm);
+void git_hash_ctx_cleanup(git_hash_ctx *ctx);
+
+int git_hash_init(git_hash_ctx *c);
+int git_hash_update(git_hash_ctx *c, const void *data, size_t len);
+int git_hash_final(unsigned char *out, git_hash_ctx *c);
+
+int git_hash_buf(unsigned char *out, const void *data, size_t len, git_hash_algorithm_t algorithm);
+int git_hash_vec(unsigned char *out, git_str_vec *vec, size_t n, git_hash_algorithm_t algorithm);
+
+int git_hash_fmt(char *out, unsigned char *hash, size_t hash_len);
+
+GIT_INLINE(size_t) git_hash_size(git_hash_algorithm_t algorithm) {
+	switch (algorithm) {
+		case GIT_HASH_ALGORITHM_SHA1:
+			return GIT_HASH_SHA1_SIZE;
+		case GIT_HASH_ALGORITHM_SHA256:
+			return GIT_HASH_SHA256_SIZE;
+		default:
+			return 0;
+	}
+}
+
+#endif