1 files changed, 55 insertions, 0 deletions
diff --git a/src/lib/hash-method.h b/src/lib/hash-method.h
new file mode 100644
index 0000000..c4250de
--- /dev/null
+++ b/src/lib/hash-method.h
@@ -0,0 +1,55 @@
+#ifndef HASH_METHOD_H
+#define HASH_METHOD_H
+
+#include "buffer.h"
+
+struct hash_method {
+	const char *name;
+	/* Block size for the algorithm */
+	unsigned int block_size;
+	/* Number of bytes that must be allocated for context */
+	unsigned int context_size;
+	/* Number of bytes that must be allocated for result()'s digest */
+	unsigned int digest_size;
+
+	void (*init)(void *context);
+	void (*loop)(void *context, const void *data, size_t size);
+	void (*result)(void *context, unsigned char *digest_r);
+};
+
+const struct hash_method *hash_method_lookup(const char *name);
+
+/* NULL-terminated list of all hash methods */
+extern const struct hash_method *hash_methods[];
+
+void hash_method_get_digest(const struct hash_method *meth,
+			    const void *data, size_t data_len,
+			    unsigned char *result_r);
+
+/** Simple datastack helpers for digesting (hashing)
+
+ * USAGE:
+
+ buffer_t *result = t_hash_str(hash_method_lookup("sha256"), "hello world");
+ const char *hex = binary_to_hex(result->data, result->used);
+
+*/
+
+buffer_t *t_hash_data(const struct hash_method *meth,
+		      const void *data, size_t data_len);
+
+static inline
+buffer_t *t_hash_buffer(const struct hash_method *meth,
+			const buffer_t *data)
+{
+	return t_hash_data(meth, data->data, data->used);
+}
+
+static inline
+buffer_t *t_hash_str(const struct hash_method *meth,
+		     const char *data)
+{
+	return t_hash_data(meth, data, strlen(data));
+}
+
+#endif