170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
/*
|
|
==============================================================================
|
|
Name : micro_fpe.h
|
|
Author : polfosol
|
|
Version : 2.2.0.0
|
|
Copyright : copyright © 2022 - polfosol
|
|
Description : demonstrating some sample alphabets for the FPE mode of μAES ™
|
|
==============================================================================
|
|
*/
|
|
|
|
#ifndef MICRO_FPE_H_
|
|
#define MICRO_FPE_H_
|
|
|
|
/******************************************************************************
|
|
* In what follows, a few sample alphabets and their corresponding macros are
|
|
* provided. Accordingly, it would be straightforward to define any alphabet.
|
|
* If your desired alphabet contains non-ASCII characters, the CUSTOM_ALPHABET
|
|
* macro 'must be' set to a double-digit number, e.g. 21. The declaration of an
|
|
* alphabet needs to be followed by its number of characters (RADIX).
|
|
*/
|
|
#define NON_ASCII_CHARACTER_SET (CUSTOM_ALPHABET >= 10)
|
|
|
|
|
|
/******************************************************************************
|
|
* These strings frequently appear in ASCII-based alphabets.
|
|
*/
|
|
#define DECIMALS "0123456789"
|
|
#define LLETTERS "abcdefghijklmnopqrstuvwxyz"
|
|
#define ULETTERS "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
#define HEXCHARS DECIMALS "ABCDEFabcdef"
|
|
|
|
/**
|
|
numbers
|
|
*/
|
|
#if CUSTOM_ALPHABET == 0
|
|
#define ALPHABET DECIMALS
|
|
#define RADIX 10
|
|
#endif
|
|
|
|
/**
|
|
binary numbers
|
|
*/
|
|
#if CUSTOM_ALPHABET == 1
|
|
#define ALPHABET "01"
|
|
#define RADIX 2
|
|
#endif
|
|
|
|
/**
|
|
lowercase english words
|
|
*/
|
|
#if CUSTOM_ALPHABET == 2
|
|
#define ALPHABET LLETTERS
|
|
#define RADIX 26
|
|
#endif
|
|
|
|
/**
|
|
lowercase alphanumeric strings
|
|
*/
|
|
#if CUSTOM_ALPHABET == 3
|
|
#define ALPHABET DECIMALS LLETTERS
|
|
#define RADIX 36
|
|
#endif
|
|
|
|
/**
|
|
the English alphabet
|
|
*/
|
|
#if CUSTOM_ALPHABET == 4
|
|
#define ALPHABET ULETTERS LLETTERS
|
|
#define RADIX 52
|
|
#endif
|
|
|
|
/**
|
|
base-64 encoded strings (RFC-4648), with no padding character
|
|
*/
|
|
#if CUSTOM_ALPHABET == 5
|
|
#define ALPHABET ULETTERS LLETTERS DECIMALS "+/"
|
|
#define RADIX 64
|
|
#endif
|
|
|
|
/**
|
|
base-85 encoded strings (RFC-1924)
|
|
*/
|
|
#if CUSTOM_ALPHABET == 6
|
|
#define ALPHABET DECIMALS ULETTERS LLETTERS "!#$%&()*+-;<=>?@^_`{|}~"
|
|
#define RADIX 85
|
|
#endif
|
|
|
|
/**
|
|
a character set with length 26, used by some test vectors
|
|
*/
|
|
#if CUSTOM_ALPHABET == 7
|
|
#define ALPHABET DECIMALS "abcdefghijklmnop"
|
|
#define RADIX 26
|
|
#endif
|
|
|
|
/**
|
|
base-64 character set with DIFFERENT ORDERING, used by some test vectors
|
|
*/
|
|
#if CUSTOM_ALPHABET == 8
|
|
#define ALPHABET DECIMALS ULETTERS LLETTERS "+/"
|
|
#define RADIX 64
|
|
#endif
|
|
|
|
/**
|
|
all printable ascii characters
|
|
*/
|
|
#if CUSTOM_ALPHABET == 9
|
|
#define ALPHABET " !\"#$%&\'()*+,-./"DECIMALS":;<=>?@"ULETTERS"[\\]^_`"LLETTERS"{|}~"
|
|
#define RADIX 95
|
|
#endif
|
|
|
|
|
|
/******************************************************************************
|
|
* Here goes non-ASCII alphabets. Note that C89/ANSI-C standard does not fully
|
|
* support such characters, and the code may lose its compliance in this case.
|
|
*/
|
|
#if NON_ASCII_CHARACTER_SET
|
|
#include <locale.h>
|
|
#include <wchar.h>
|
|
|
|
#define string_t wchar_t* /* type of plain/cipher-text */
|
|
#else
|
|
#define string_t char*
|
|
#endif
|
|
|
|
/**
|
|
Greek alphabet (LTR)
|
|
*/
|
|
#if CUSTOM_ALPHABET == 10
|
|
#define ALPHABET L"ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩαβγδεζηθικλμνξοπρσςτυφϕχψω"
|
|
#define RADIX 50
|
|
#endif
|
|
|
|
/**
|
|
Persian alphabet (RTL)
|
|
*/
|
|
#if CUSTOM_ALPHABET == 20
|
|
#define ALPHABET L"ءئؤآابپتثجچحخدذرزژسشصضطظعغفقکگلمنوهی"
|
|
#define RADIX 36
|
|
#endif
|
|
|
|
|
|
/******************************************************************************
|
|
* It is mandatory to determine these constants for the alphabet. You can either
|
|
* pre-calculate the logarithm value (with at least 15 significant digits) and
|
|
* set it as a constant, or leave its calculation to the standard math library.
|
|
* Other constants are directly related to the value of logarithm, and MAXLEN is
|
|
* needed only in the FF3 mode.
|
|
*
|
|
#define MINLEN (RADIX < 8 ? 40 / RADIX + (RADIX / 4) * (RADIX - 4) : \
|
|
(RADIX < 1000) + (RADIX < 100) - (RADIX == 10) + 2 + 31 / RADIX)
|
|
*
|
|
* The above lines illustrate that MINLEN can also be defined independently,
|
|
* using pure integer arithmetics.
|
|
*/
|
|
#include <math.h>
|
|
#ifdef MATH_ERRNO
|
|
#define LOGRDX log2( RADIX )
|
|
#else /* this means std-C <= C90 */
|
|
#define LOGRDX (log( RADIX ) / log( 2 ))
|
|
#endif
|
|
|
|
#define MINLEN ((int) (19.931568 / LOGRDX + 1))
|
|
|
|
#if FF_X == 3
|
|
#define MAXLEN (2 * (int) (96.000001 / LOGRDX))
|
|
#endif
|
|
|
|
#endif /* header guard */
|