fundamental: Import SHA1 implementation from libxcrypt

1 files changed, 36 insertions, 0 deletions

diff --git a/src/fundamental/sha1-fundamental.h b/src/fundamental/sha1-fundamental.h
new file mode 100644
index 0000000000..3577ad5809
--- /dev/null
+++ b/src/fundamental/sha1-fundamental.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LicenseRef-alg-sha1-public-domain */
+
+/*
+ * This is an implementation of the National Institute of Standards
+ * and Technology US Secure Hash Algorithm 1 (SHA1).
+ *
+ * Public api for steve reid's public domain SHA-1 implementation.
+ * This file is in the public domain.
+ */
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define SHA1_DIGEST_SIZE 20
+
+/* Structure to save state of computation between the single steps.  */
+struct sha1_ctx {
+        uint32_t state[5];
+        uint32_t count[2];
+        uint8_t buffer[64];
+};
+
+/* Initialize structure containing state of computation.
+   (RFC 3174, 6.1)  */
+void sha1_init_ctx(struct sha1_ctx *ctx);
+
+/* Starting with the result of former calls of this function (or the
+   initialization function) update the context for the next LEN bytes
+   starting at BUFFER.  LEN does not need to be a multiple of 64.  */
+void sha1_process_bytes(const void *buffer, size_t size, struct sha1_ctx *ctx);
+
+/* Process the remaining bytes in the buffer and write the finalized
+   hash to RESBUF, which should point to 20 bytes of storage.  All
+   data written to CTX is erased before returning from the function.  */
+void *sha1_finish_ctx(struct sha1_ctx *ctx, uint8_t result[static SHA1_DIGEST_SIZE]);