1 files changed, 28 insertions, 0 deletions
diff --git a/src/boot/efi/sha256.h b/src/boot/efi/sha256.h
new file mode 100644
index 0000000..464be59
--- /dev/null
+++ b/src/boot/efi/sha256.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <efi.h>
+#include <efilib.h>
+
+struct sha256_ctx {
+        UINT32 H[8];
+
+        union {
+                UINT64 total64;
+#define TOTAL64_low (1 - (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
+#define TOTAL64_high (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+                UINT32 total[2];
+        };
+
+        UINT32 buflen;
+
+        union {
+                UINT8 buffer[128]; /* NB: always correctly aligned for UINT32.  */
+                UINT32 buffer32[32];
+                UINT64 buffer64[16];
+        };
+};
+
+void sha256_init_ctx(struct sha256_ctx *ctx);
+void *sha256_finish_ctx(struct sha256_ctx *ctx, VOID *resbuf);
+void sha256_process_bytes(const void *buffer, UINTN len, struct sha256_ctx *ctx);