From 8a9208612eec8ddae4c418485d848ecfa0613699 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Mon, 30 Oct 2023 22:12:14 +0100
Subject: Meta: Move kernel and userland to their own folders.

This is to allow both the kernel and the userland to share certain
header files and to make the folder structure a bit more clear.
---
 kernel/crypto/ChaCha20/chacha20.c | 29 +++++++++++++++++++++++++++++
 kernel/crypto/ChaCha20/chacha20.h | 15 +++++++++++++++
 kernel/crypto/SHA1                |  1 +
 3 files changed, 45 insertions(+)
 create mode 100644 kernel/crypto/ChaCha20/chacha20.c
 create mode 100644 kernel/crypto/ChaCha20/chacha20.h
 create mode 160000 kernel/crypto/SHA1

(limited to 'kernel/crypto')

diff --git a/kernel/crypto/ChaCha20/chacha20.c b/kernel/crypto/ChaCha20/chacha20.c
new file mode 100644
index 0000000..5bf7aa2
--- /dev/null
+++ b/kernel/crypto/ChaCha20/chacha20.c
@@ -0,0 +1,29 @@
+#include "chacha20.h"
+
+#define ROTL(a, b) (((a) << (b)) | ((a) >> (32 - (b))))
+#define QR(a, b, c, d)                                                         \
+	(a += b, d ^= a, d = ROTL(d, 16), c += d, b ^= c, b = ROTL(b, 12),     \
+	 a += b, d ^= a, d = ROTL(d, 8), c += d, b ^= c, b = ROTL(b, 7))
+#define ROUNDS 20
+
+void chacha_block(uint32_t out[16], uint32_t const in[16])
+{
+	int i;
+	uint32_t x[16];
+
+	for (i = 0; i < 16; ++i)
+		x[i] = in[i];
+	for (i = 0; i < ROUNDS; i += 2) {
+		QR(x[0], x[4], x[8], x[12]);
+		QR(x[1], x[5], x[9], x[13]);
+		QR(x[2], x[6], x[10], x[14]);
+		QR(x[3], x[7], x[11], x[15]);
+
+		QR(x[0], x[5], x[10], x[15]);
+		QR(x[1], x[6], x[11], x[12]);
+		QR(x[2], x[7], x[8], x[13]);
+		QR(x[3], x[4], x[9], x[14]);
+	}
+	for (i = 0; i < 16; ++i)
+		out[i] = x[i] + in[i];
+}
diff --git a/kernel/crypto/ChaCha20/chacha20.h b/kernel/crypto/ChaCha20/chacha20.h
new file mode 100644
index 0000000..17532f3
--- /dev/null
+++ b/kernel/crypto/ChaCha20/chacha20.h
@@ -0,0 +1,15 @@
+#ifndef CHACHA20_H
+#define CHACHA20_H
+#include <stdint.h>
+
+#define KEY 4
+#define KEY_SIZE 8*sizeof(uint32_t)
+#define COUNT 12
+#define COUNT_SIZE sizeof(uint32_t)
+#define COUNT_MAX (0x100000000-1) // 2^32 - 1
+#define NONCE 13
+#define NONCE_SIZE 2*sizeof(uint32_t)
+#define BLOCK_SIZE 16*sizeof(uint32_t)
+
+void chacha_block(uint32_t out[16], uint32_t const in[16]);
+#endif
diff --git a/kernel/crypto/SHA1 b/kernel/crypto/SHA1
new file mode 160000
index 0000000..237ea70
--- /dev/null
+++ b/kernel/crypto/SHA1
@@ -0,0 +1 @@
+Subproject commit 237ea7023cad8402932dfbde337d69e5f4d515f6
-- 
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