1 files changed, 30 insertions, 0 deletions
diff --git a/src/include/ipxe/hash_df.h b/src/include/ipxe/hash_df.h
new file mode 100644
index 000000000..003e5ceff
--- /dev/null
+++ b/src/include/ipxe/hash_df.h
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+#ifndef _IPXE_HASH_DF_H
+#define _IPXE_HASH_DF_H
+
+/** @file
+ *
+ * Hash-based derivation function (Hash_df)
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <ipxe/sha1.h>
+
+/** Use SHA-1 as the underlying hash algorithm
+ *
+ * Hash_df using SHA-1 is an Approved algorithm in ANS X9.82.
+ */
+#define hash_df_algorithm sha1_algorithm
+
+/** Underlying hash algorithm output length (in bytes) */
+#define HASH_DF_OUTLEN_BYTES SHA1_DIGEST_SIZE
+
+/** Underlying hash algorithm context size (in bytes) */
+#define HASH_DF_CTX_SIZE SHA1_CTX_SIZE
+
+extern void hash_df ( const void *input, size_t input_len, void *output,
+		      size_t output_len );
+
+#endif /* _IPXE_HASH_DF_H */