Adds most of the toolsHEADmaster

1 files changed, 33 insertions, 0 deletions

diff --git a/v_windows/v/vlib/crypto/cipher/xor_generic.v b/v_windows/v/vlib/crypto/cipher/xor_generic.v
new file mode 100644
index 0000000..bbec30b
--- /dev/null
+++ b/v_windows/v/vlib/crypto/cipher/xor_generic.v
@@ -0,0 +1,33 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module cipher
+
+// NOTE: Implement other versions (joe-c)
+// xor_bytes xors the bytes in a and b. The destination should have enough
+// space, otherwise xor_bytes will panic. Returns the number of bytes xor'd.
+pub fn xor_bytes(mut dst []byte, a []byte, b []byte) int {
+	mut n := a.len
+	if b.len < n {
+		n = b.len
+	}
+	if n == 0 {
+		return 0
+	}
+	safe_xor_bytes(mut dst, a, b, n)
+	return n
+}
+
+// safe_xor_bytes XORs the bytes in `a` and `b` into `dst` it does so `n` times.
+// Please note: `n` needs to be smaller or equal than the length of `a` and `b`.
+pub fn safe_xor_bytes(mut dst []byte, a []byte, b []byte, n int) {
+	for i in 0 .. n {
+		dst[i] = a[i] ^ b[i]
+	}
+}
+
+// xor_words XORs multiples of 4 or 8 bytes (depending on architecture.)
+// The slice arguments `a` and `b` are assumed to be of equal length.
+pub fn xor_words(mut dst []byte, a []byte, b []byte) {
+	safe_xor_bytes(mut dst, a, b, b.len)
+}