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pt.kcry.blake3.RFC4648.scala Maven / Gradle / Ivy
/*
* scala-blake3 - highly optimized blake3 implementation for scala, scala-js and scala-native.
*
* Written in 2020, 2021 by Kirill A. Korinsky
*
* Supported since 2022 by Kcrypt Lab UG
*
* This work is released into the public domain with CC0 1.0.
* Alternatively, it is licensed under the Apache License 2.0.
*/
package pt.kcry.blake3
/**
* Implementing RFC 4648 encoding without padding
*/
object RFC4648 {
/**
* RFC 4648 Section 4
*/
val base64_alphabet: Array[Char] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray
/**
* RFC 4648 Section 5
*/
val base64_url_alphabet: Array[Char] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
.toCharArray
/**
* RFC 4648 Section 6
*/
val base32_alphabet: Array[Char] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567".toCharArray
/**
* RFC 4648 Section 7
*/
val base32_hex_alphabet: Array[Char] =
"0123456789ABCDEFGHIJKLMNOPQRSTUV".toCharArray
/**
* RFC 4648 Section 8
*/
val base16_alphabet: Array[Char] = "0123456789ABCDEF".toCharArray
def base64_b2c(
bytes: Array[Byte], offset: Int, len: Int, alphabet: Array[Char],
sb: StringBuilder
): Unit = len match {
case 0 =>
// do nothing
case 1 =>
sb append alphabet((bytes(offset) >>> 2) & 0x3f)
sb append alphabet((bytes(offset) & 0x3) << 4)
case 2 =>
sb append alphabet((bytes(offset) >>> 2) & 0x3f)
sb append
alphabet(((bytes(offset) & 0x3) << 4) | ((bytes(offset + 1) >>> 4) & 0xf))
sb append alphabet((bytes(offset + 1) & 0xf) << 2)
case _ => // 3 or more
sb append alphabet((bytes(offset) >>> 2) & 0x3f)
sb append
alphabet(((bytes(offset) & 0x3) << 4) | ((bytes(offset + 1) >>> 4) & 0xf))
sb append alphabet(((bytes(offset + 1) & 0xf) << 2) |
((bytes(offset + 2) >>> 6) & 0x3))
sb append alphabet(bytes(offset + 2) & 0x3f)
}
private def base32_b2c(
bytes: Array[Byte], offset: Int, len: Int, alphabet: Array[Char],
sb: StringBuilder
): Unit = len match {
case 0 =>
// do nothing
case 1 =>
sb append alphabet((bytes(offset) >>> 3) & 0x1f)
sb append alphabet((bytes(offset) & 0x7) << 2)
case 2 =>
sb append alphabet((bytes(offset) >>> 3) & 0x1f)
sb append
alphabet(((bytes(offset) & 0x7) << 2) | ((bytes(offset + 1) >>> 6) & 0x3))
sb append alphabet((bytes(offset + 1) >>> 1) & 0x1f)
sb append alphabet((bytes(offset + 1) & 0x1) << 4)
case 3 =>
sb append alphabet((bytes(offset) >>> 3) & 0x1f)
sb append
alphabet(((bytes(offset) & 0x7) << 2) | ((bytes(offset + 1) >>> 6) & 0x3))
sb append alphabet((bytes(offset + 1) >>> 1) & 0x1f)
sb append alphabet(((bytes(offset + 1) & 0x1) << 4) |
((bytes(offset + 2) >>> 4) & 0xf))
sb append alphabet((bytes(offset + 2) & 0xf) << 1)
case 4 =>
sb append alphabet((bytes(offset) >>> 3) & 0x1f)
sb append
alphabet(((bytes(offset) & 0x7) << 2) | ((bytes(offset + 1) >>> 6) & 0x3))
sb append alphabet((bytes(offset + 1) >>> 1) & 0x1f)
sb append alphabet(((bytes(offset + 1) & 0x1) << 4) |
((bytes(offset + 2) >>> 4) & 0xf))
sb append alphabet(((bytes(offset + 2) & 0xf) << 1) |
((bytes(offset + 3) >>> 7) & 0x1))
sb append alphabet((bytes(offset + 3) >>> 2) & 0x1f)
sb append alphabet((bytes(offset + 3) & 0x3) << 3)
case _ => // 5 or more
sb append alphabet((bytes(offset) >>> 3) & 0x1f)
sb append
alphabet(((bytes(offset) & 0x7) << 2) | ((bytes(offset + 1) >>> 6) & 0x3))
sb append alphabet((bytes(offset + 1) >>> 1) & 0x1f)
sb append alphabet(((bytes(offset + 1) & 0x1) << 4) |
((bytes(offset + 2) >>> 4) & 0xf))
sb append alphabet(((bytes(offset + 2) & 0xf) << 1) |
((bytes(offset + 3) >>> 7) & 0x1))
sb append alphabet((bytes(offset + 3) >>> 2) & 0x1f)
sb append alphabet(((bytes(offset + 3) & 0x3) << 3) |
((bytes(offset + 4) >>> 5) & 0x7))
sb append alphabet(bytes(offset + 4) & 0x1f)
}
private def base16_b2c(
byte: Byte, alphabet: Array[Char], sb: StringBuilder
): Unit = {
sb append alphabet((byte >>> 4) & 0xf)
sb append alphabet(byte & 0xf)
}
/**
* Encode specified part of array as base64 with specified alphabet
*/
def base64(
data: Array[Byte], offset: Int, len: Int, alphabet: Array[Char]
): String = {
val sb = new StringBuilder(4 * (len / 3))
var i = offset
val lim = offset + len
while (i < lim) {
base64_b2c(data, i, lim - i, alphabet, sb)
i += 3
}
sb.toString()
}
/**
* Encode an array as base64 with specified alphabet
*/
def base64(data: Array[Byte], alphabet: Array[Char]): String = base64(data, 0,
data.length, alphabet)
/**
* Encode specified part of array as base64 with RFC 4648 Section 4 alphabet
*/
def base64(data: Array[Byte], offset: Int, len: Int): String = base64(data,
offset, len, base64_alphabet)
/**
* Encode an array as base64 with RFC 4648 Section 4 alphabet
*/
def base64(data: Array[Byte]): String = base64(data, 0, data.length,
base64_alphabet)
/**
* Encode specified part of array as base64 with RFC 4648 Section 5 alphabet
*/
def base64_url(data: Array[Byte], offset: Int, len: Int): String =
base64(data, offset, len, base64_url_alphabet)
/**
* Encode an array as base64 with RFC 4648 Section 5 alphabet
*/
def base64_url(data: Array[Byte]): String = base64(data, 0, data.length,
base64_url_alphabet)
/**
* Encode specified part of array as base32 with specified alphabet
*/
def base32(
data: Array[Byte], offset: Int, len: Int, alphabet: Array[Char]
): String = {
val sb = new StringBuilder(8 * (len / 5))
var i = offset
val lim = offset + len
while (i < lim) {
base32_b2c(data, i, lim - i, alphabet, sb)
i += 5
}
sb.toString()
}
/**
* Encode an array as base32 with specified alphabet
*/
def base32(data: Array[Byte], alphabet: Array[Char]): String = base32(data, 0,
data.length, alphabet)
/**
* Encode specified part of array as base32 with RFC 4648 Section 6 alphabet
*/
def base32(data: Array[Byte], offset: Int, len: Int): String = base32(data,
offset, len, base32_alphabet)
/**
* Encode an array as base32 with RFC 4648 Section 6 alphabet
*/
def base32(data: Array[Byte]): String = base32(data, 0, data.length,
base32_alphabet)
/**
* Encode specified part of array as base32 with RFC 4648 Section 7 alphabet
*/
def base32_hex(data: Array[Byte], offset: Int, len: Int): String =
base32(data, offset, len, base32_hex_alphabet)
/**
* Encode an array as base32 with RFC 4648 Section 7 alphabet
*/
def base32_hex(data: Array[Byte]): String = base32(data, 0, data.length,
base32_hex_alphabet)
/**
* Encode specified part of array as base16 with specified alphabet
*/
def base16(
data: Array[Byte], offset: Int, len: Int, alphabet: Array[Char]
): String = {
val sb = new StringBuilder(len * 2)
var i = offset
val lim = offset + len
while (i < lim) {
base16_b2c(data(i), alphabet, sb)
i += 1
}
sb.toString()
}
/**
* Encode an array as base16 with specified alphabet
*/
def base16(data: Array[Byte], alphabet: Array[Char]): String = base16(data, 0,
data.length, alphabet)
/**
* Encode specified part of array as base16 with RFC 4648 Section 8 alphabet
*/
def base16(data: Array[Byte], offset: Int, len: Int): String = base16(data,
offset, len, base16_alphabet)
/**
* Encode an array as base16 with RFC 4648 Section 8 alphabet
*/
def base16(data: Array[Byte]): String = base16(data, 0, data.length,
base16_alphabet)
}
