vlib/crypto/bcrypt: Add bcrypt (#12595)

vlib/crypto/blowfish/blowfish.v

@@ -0,0 +1,37 @@
+module blowfish
+
+pub struct Blowfish {
+pub mut:
+	p [18]u32
+	s [4][256]u32
+}
+
+pub fn new_cipher(key []byte) ?Blowfish {
+	mut bf := Blowfish{p, s}
+	if key.len < 1 || key.len > 56 {
+		return error('invalid key')
+	}
+	expand_key(key, mut bf)
+
+	return bf
+}
+
+pub fn new_salted_cipher(key []byte, salt []byte) ?Blowfish {
+	if salt.len == 0 {
+		return new_cipher(key)
+	}
+	mut bf := Blowfish{p, s}
+	if key.len < 1 {
+		return error('invalid key')
+	}
+	expand_key_with_salt(key, salt, mut bf)
+	return bf
+}
+
+pub fn (mut bf Blowfish) encrypt(mut dst []byte, src []byte) {
+	l := u32(src[0]) << 24 | u32(src[1]) << 16 | u32(src[2]) << 8 | u32(src[3])
+	r := u32(src[4]) << 24 | u32(src[5]) << 16 | u32(src[6]) << 8 | u32(src[7])
+	arr := encrypt_block(l, r, mut bf)
+	dst[0], dst[1], dst[2], dst[3] = byte(arr[0] >> 24), byte(arr[0] >> 16), byte(arr[0] >> 8), byte(arr[0])
+	dst[4], dst[5], dst[6], dst[7] = byte(arr[1] >> 24), byte(arr[1] >> 16), byte(arr[1] >> 8), byte(arr[1])
+}