Initial project import

tools/v/vlib/crypto/bcrypt/base64.v

@@ -0,0 +1,97 @@
+module bcrypt
+
+const alphabet = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
+
+fn char64(c u8) u8 {
+	for i, ch in alphabet {
+		if ch == c {
+			return u8(i)
+		}
+	}
+	return 255
+}
+
+fn base64_decode(data string) []u8 {
+	mut dest_index := 0
+	mut result := []u8{}
+	for src_index := 0; src_index < data.len - 1; src_index += 4 {
+		c1 := char64(data[src_index])
+
+		if src_index + 1 >= data.len {
+			break
+		}
+
+		c2 := char64(data[src_index + 1])
+
+		// Invalid data */
+		if c1 == 255 || c2 == 255 {
+			break
+		}
+
+		result << ((c1 << 2) | ((c2 & 0x30) >> 4))
+		dest_index += 1
+
+		if src_index + 2 >= data.len || dest_index == 16 {
+			break
+		}
+
+		c3 := char64(data[src_index + 2])
+		if c3 == 255 {
+			break
+		}
+
+		result << (((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2))
+		dest_index += 1
+
+		if src_index + 3 >= data.len || dest_index == 16 {
+			break
+		}
+
+		c4 := char64(data[src_index + 3])
+		if c4 == 255 {
+			break
+		}
+
+		result << (((c3 & 0x03) << 6) | c4)
+		dest_index += 1
+
+		if dest_index == 16 {
+			break
+		}
+	}
+
+	return result
+}
+
+fn base64_encode(data []u8) string {
+	mut src_index := 0
+	mut result := []u8{}
+	for src_index < data.len {
+		mut c1 := data[src_index]
+		src_index += 1
+		result << alphabet[c1 >> 2]
+		c1 = (c1 & 0x03) << 4
+		if src_index >= data.len {
+			result << alphabet[c1]
+			break
+		}
+
+		mut c2 := data[src_index]
+		src_index += 1
+		c1 |= (c2 >> 4) & 0x0f
+		result << alphabet[c1]
+		c1 = (c2 & 0x0f) << 2
+		if src_index >= data.len {
+			result << alphabet[c1]
+			break
+		}
+
+		c2 = data[src_index]
+		src_index += 1
+		c1 |= (c2 >> 6) & 0x03
+		result << alphabet[c1]
+		result << alphabet[c2 & 0x3f]
+	}
+
+	return result.bytestr()
+}