169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
/*
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==============================================================================
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Name : micro_fpe.h
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Author : polfosol
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Version : 2.1.1.2
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Copyright : copyright © 2022 - polfosol
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Description : demonstrating some sample alphabets for the FPE mode of μAES ™
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==============================================================================
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*/
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#ifndef MICRO_FPE_H_
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#define MICRO_FPE_H_
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/******************************************************************************
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* If your desired alphabet contains non-ASCII characters, the CUSTOM_ALPHABET
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* macro 'must be' set to a double-digit number, e.g 21. In what follows, there
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* are some sample alphabets along with their corresponding macro definitions.
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* It is straightforward to define another alphabet according to these samples.
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*/
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#define NON_ASCII_CHARACTER_SET (CUSTOM_ALPHABET >= 10)
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/******************************************************************************
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* These strings are commonly used in ASCII-based alphabets. The declaration of
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* an alphabet must be followed by its number of characters (RADIX).
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*/
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#define DECDIGIT "0123456789"
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#define LCLETTER "abcdefghijklmnopqrstuvwxyz"
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#define UCLETTER "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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#define HEXDIGIT DECDIGIT "ABCDEFabcdef"
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/**
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numbers
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*/
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#if CUSTOM_ALPHABET == 0
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#define ALPHABET DECDIGIT
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#define RADIX 10
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#endif
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/**
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binary numbers
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*/
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#if CUSTOM_ALPHABET == 1
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#define ALPHABET "01"
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#define RADIX 2
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#endif
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/**
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lowercase english words
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*/
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#if CUSTOM_ALPHABET == 2
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#define ALPHABET LCLETTER
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#define RADIX 26
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#endif
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/**
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lowercase alphanumeric strings
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*/
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#if CUSTOM_ALPHABET == 3
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#define ALPHABET DECDIGIT LCLETTER
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#define RADIX 36
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#endif
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/**
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the English alphabet
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*/
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#if CUSTOM_ALPHABET == 4
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#define ALPHABET UCLETTER LCLETTER
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#define RADIX 52
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#endif
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/**
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base-64 encoded strings (RFC-4648), with no padding character
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*/
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#if CUSTOM_ALPHABET == 5
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#define ALPHABET UCLETTER LCLETTER DECDIGIT "+/"
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#define RADIX 64
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#endif
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/**
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base-85 encoded strings (RFC-1924)
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*/
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#if CUSTOM_ALPHABET == 6
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#define ALPHABET DECDIGIT UCLETTER LCLETTER "!#$%&()*+-;<=>?@^_`{|}~"
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#define RADIX 85
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#endif
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/**
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a character set with length 26, used by some test vectors
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*/
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#if CUSTOM_ALPHABET == 7
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#define ALPHABET DECDIGIT "abcdefghijklmnop"
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#define RADIX 26
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#endif
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/**
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base-64 character set with DIFFERENT ORDERING, used by some test vectors
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*/
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#if CUSTOM_ALPHABET == 8
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#define ALPHABET DECDIGIT UCLETTER LCLETTER "+/"
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#define RADIX 64
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#endif
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/**
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all printable ascii characters
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*/
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#if CUSTOM_ALPHABET == 9
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#define ALPHABET " !\"#$%&\'()*+,-./"DECDIGIT":;<=>?@"UCLETTER"[\\]^_`"LCLETTER"{|}~"
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#define RADIX 95
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#endif
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/******************************************************************************
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* Here goes non-ASCII alphabets. Note that C89/ANSI-C standard does not fully
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* support such characters, and the code may lose its compliance in this case.
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*/
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#if NON_ASCII_CHARACTER_SET
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#include <locale.h>
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#include <wchar.h>
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#define string_t wchar_t* /* type of plain/cipher-text */
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#else
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#define string_t char*
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#endif
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/**
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Greek alphabet (LTR)
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*/
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#if CUSTOM_ALPHABET == 10
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#define ALPHABET L"ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩαβγδεζηθικλμνξοπρσςτυφϕχψω"
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#define RADIX 50
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#endif
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/**
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Persian alphabet (RTL)
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*/
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#if CUSTOM_ALPHABET == 20
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#define ALPHABET L"ءئؤآابپتثجچحخدذرزژسشصضطظعغفقکگلمنوهی"
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#define RADIX 36
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#endif
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/******************************************************************************
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* It is mandatory to determine these constants for the alphabet. You can either
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* pre-calculate the logarithm value (with at least 10 significant digits) and
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* set it as a constant, or let it be calculated dynamically like this:
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*/
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#include <math.h>
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#define LOGRDX (log( RADIX ) / log( 2 )) /* log2( RADIX ) if std=C99 */
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#if FF_X == 3
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#define MAXLEN (2 * (int) (96.000001 / LOGRDX))
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#endif
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#define MINLEN ((int) (19.931568 / LOGRDX + 1))
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/******************************************************************************
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* or we can do something like this to set MINLEN:
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*
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#if RADIX >= 32
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#define MINLEN (2 + (RADIX < 1000) + (RADIX < 100))
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#elif RADIX > 5
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#define MINLEN (5 + (RADIX < 16) + (RADIX < 10) + (RADIX < 8))
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#else
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#define MINLEN (40 / RADIX + RADIX / 5)
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#endif
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*/
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#endif /* header guard */
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