Crypto++ 8.6 Free C++ class library of cryptographic schemes

Functions
words.h File Reference

Support functions for word operations. More...

Go to the source code of this file.

## Functions
size_t | CountWords (const word *x, size_t n)
| Count the number of words. More...
void | SetWords (word *r, word a, size_t n)
| Set the value of words. More...
void | CopyWords (word *r, const word *a, size_t n)
| Copy word array. More...
void | XorWords (word *r, const word *a, const word *b, size_t n)
| XOR word arrays. More...
void | XorWords (word *r, const word *a, size_t n)
| XOR word arrays. More...
void | AndWords (word *r, const word *a, const word *b, size_t n)
| AND word arrays. More...
void | AndWords (word *r, const word *a, size_t n)
| AND word arrays. More...
void | OrWords (word *r, const word *a, const word *b, size_t n)
| OR word arrays. More...
void | OrWords (word *r, const word *a, size_t n)
| OR word arrays. More...
word | ShiftWordsLeftByBits (word *r, size_t n, unsigned int shiftBits)
| Left shift word array. More...
word | ShiftWordsRightByBits (word *r, size_t n, unsigned int shiftBits)
| Right shift word array. More...
void | ShiftWordsLeftByWords (word *r, size_t n, size_t shiftWords)
| Left shift word array. More...
void | ShiftWordsRightByWords (word *r, size_t n, size_t shiftWords)
| Right shift word array. More...

## Detailed Description

Support functions for word operations.

Definition in file words.h.

## Function Documentation

## ◆ CountWords()

size_t CountWords | ( | const word * | x,
|  | size_t | n
| ) |  |
| inline

Count the number of words.

Parameters

  x | word array
  n | size of the word array, in elements

Returns
  number of words used in the array.

CountWords counts the number of words in a word array. Leading 0-words are not included in the count.

Since
  Crypto++ 1.0

Definition at line 21 of file words.h.

## ◆ SetWords()

void SetWords | ( | word * | r,
|  | word | a,
|  | size_t | n
| ) |  |
| inline

Set the value of words.

Parameters

  r | word array
  a | value
  n | size of the word array, in elements

SetWords sets all elements in the word array to the specified value.

Since
  Crypto++ 1.0

Definition at line 35 of file words.h.

## ◆ CopyWords()

void CopyWords | ( | word * | r,
|  | const word * | a,
|  | size_t | n
| ) |  |
| inline

Copy word array.

Parameters

  r | destination word array
  a | source word array
  n | size of the word array, in elements

CopyWords copies the source word array to the destination word array.

Since
  Crypto++ 1.0

Definition at line 48 of file words.h.

## ◆ XorWords() [1/2]

void XorWords | ( | word * | r,
|  | const word * | a,
|  | const word * | b,
|  | size_t | n
| ) |  |
| inline

XOR word arrays.

Parameters

  r | destination word array
  a | first source word array
  b | second source word array
  n | size of the word array, in elements

XorWords XORs the two source word arrays and copies the result to the destination word array.

Since
  Crypto++ 1.0

Definition at line 66 of file words.h.

## ◆ XorWords() [2/2]

void XorWords | ( | word * | r,
|  | const word * | a,
|  | size_t | n
| ) |  |
| inline

XOR word arrays.

Parameters

  r | destination word array
  a | source word array
  n | size of the word array, in elements

XorWords XORs the source word array with the destination word array.

Since
  Crypto++ 1.0

Definition at line 79 of file words.h.

## ◆ AndWords() [1/2]

void AndWords | ( | word * | r,
|  | const word * | a,
|  | const word * | b,
|  | size_t | n
| ) |  |
| inline

AND word arrays.

Parameters

  r | destination word array
  a | first source word array
  b | second source word array
  n | size of the word array, in elements

AndWords ANDs the two source word arrays and copies the result to the destination word array.

Since
  Crypto++ 1.0

Definition at line 93 of file words.h.

## ◆ AndWords() [2/2]

void AndWords | ( | word * | r,
|  | const word * | a,
|  | size_t | n
| ) |  |
| inline

AND word arrays.

Parameters

  r | destination word array
  a | source word array
  n | size of the word array, in elements

AndWords ANDs the source word array with the destination word array.

Since
  Crypto++ 1.0

Definition at line 106 of file words.h.

## ◆ OrWords() [1/2]

void OrWords | ( | word * | r,
|  | const word * | a,
|  | const word * | b,
|  | size_t | n
| ) |  |
| inline

OR word arrays.

Parameters

  r | destination word array
  a | first source word array
  b | second source word array
  n | size of the word array, in elements

OrWords ORs the two source word arrays and copies the result to the destination word array.

Since
  Crypto++ 1.0

Definition at line 120 of file words.h.

## ◆ OrWords() [2/2]

void OrWords | ( | word * | r,
|  | const word * | a,
|  | size_t | n
| ) |  |
| inline

OR word arrays.

Parameters

  r | destination word array
  a | source word array
  n | size of the word array, in elements

OrWords ORs the source word array with the destination word array.

Since
  Crypto++ 1.0

Definition at line 133 of file words.h.

## ◆ ShiftWordsLeftByBits()

word ShiftWordsLeftByBits | ( | word * | r,
|  | size_t | n,
|  | unsigned int | shiftBits
| ) |  |
| inline

Left shift word array.

Parameters

  r | word array
  n | size of the word array, in elements
  shiftBits | number of bits to shift

Returns
  word shifted out

ShiftWordsLeftByBits shifts the word array left by shiftBits. ShiftWordsLeftByBits shifts bits out on the left; it does not extend the array.

Note
  shiftBits must be less than WORD_BITS.

Since
  Crypto++ 1.0

Definition at line 149 of file words.h.

## ◆ ShiftWordsRightByBits()

word ShiftWordsRightByBits | ( | word * | r,
|  | size_t | n,
|  | unsigned int | shiftBits
| ) |  |
| inline

Right shift word array.

Parameters

  r | word array
  n | size of the word array, in elements
  shiftBits | number of bits to shift

Returns
  word shifted out

ShiftWordsRightByBits shifts the word array shight by shiftBits. ShiftWordsRightByBits shifts bits out on the right.

Note
  shiftBits must be less than WORD_BITS.

Since
  Crypto++ 1.0

Definition at line 172 of file words.h.

## ◆ ShiftWordsLeftByWords()

void ShiftWordsLeftByWords | ( | word * | r,
|  | size_t | n,
|  | size_t | shiftWords
| ) |  |
| inline

Left shift word array.

Parameters

  r | word array
  n | size of the word array, in elements
  shiftWords | number of words to shift

ShiftWordsLeftByWords shifts the word array left by shiftWords. ShiftWordsLeftByWords shifts bits out on the left; it does not extend the array.

Since
  Crypto++ 1.0

Definition at line 194 of file words.h.

## ◆ ShiftWordsRightByWords()

void ShiftWordsRightByWords | ( | word * | r,
|  | size_t | n,
|  | size_t | shiftWords
| ) |  |
| inline

Right shift word array.

Parameters

  r | word array
  n | size of the word array, in elements
  shiftWords | number of words to shift

ShiftWordsRightByWords shifts the word array right by shiftWords. ShiftWordsRightByWords shifts bits out on the right.

Since
  Crypto++ 1.0

Definition at line 212 of file words.h.