gpmp::nt::RedPike Class Reference

Class for encryption and decryption using the RedPike algorithm. More...

#include <redpike.hpp>

Public Member Functions
void	encrypt (uint32_t *x, const uint32_t *k)
	Encrypts the given data using the RedPike algorithm. More...
void	decrypt (uint32_t *x, const uint32_t *k)
	Decrypts the given data using the RedPike algorithm. More...

Private Member Functions
uint32_t	rotl (uint32_t X, int R)
	Performs left rotation on the given value. More...
uint32_t	rotr (uint32_t X, int R)
	Performs right rotation on the given value. More...

Private Attributes
uint32_t	CONST = 0x9E3779B9
	Constant value used in the RedPike algorithm. More...
int	ROUNDS = 16
	Number of rounds in the RedPike algorithm. More...

Detailed Description

Class for encryption and decryption using the RedPike algorithm.

Definition at line 48 of file redpike.hpp.

Member Function Documentation

decrypt()

void gpmp::nt::RedPike::decrypt	(	uint32_t *	x,
		const uint32_t *	k
	)

Decrypts the given data using the RedPike algorithm.

Parameters

x	Pointer to the data to be decrypted
k	Pointer to the key used for decryption

Definition at line 70 of file redpike.cpp.

                                                          {
    uint32_t dk[2] = {k[1] - CONST * (ROUNDS + 1), k[0] + CONST * (ROUNDS + 1)};
 
    encrypt(x, dk);
}

encrypt()

void gpmp::nt::RedPike::encrypt	(	uint32_t *	x,
		const uint32_t *	k
	)

Encrypts the given data using the RedPike algorithm.

Parameters

x	Pointer to the data to be encrypted
k	Pointer to the key used for encryption

Definition at line 48 of file redpike.cpp.

                                                          {
    uint32_t rk0 = k[0];
    uint32_t rk1 = k[1];
 
    for (int i = 0; i < ROUNDS; i++) {
        rk0 += CONST;
        rk1 -= CONST;
 
        x[0] ^= rk0;
        x[0] += x[1];
        x[0] = rotl(x[0], x[1]);
 
        x[1] = rotr(x[1], x[0]);
        x[1] -= x[0];
        x[1] ^= rk1;
    }
 
    rk0 = x[0];
    x[0] = x[1];
    x[1] = rk0;
}

rotl()

uint32_t gpmp::nt::RedPike::rotl ( uint32_t  X, int  R  )

private

Performs left rotation on the given value.

Parameters

X	Value to be rotated
R	Number of bits to rotate left by

Returns

Rotated value

Definition at line 40 of file redpike.cpp.

                                              {
    return ((X) << ((R)&31)) | ((X) >> (32 - ((R)&31)));
}

rotr()

uint32_t gpmp::nt::RedPike::rotr ( uint32_t  X, int  R  )

private

Performs right rotation on the given value.

Parameters

X	Value to be rotated
R	Number of bits to rotate right by

Returns

Rotated value

Definition at line 44 of file redpike.cpp.

                                              {
    return ((X) >> ((R)&31)) | ((X) << (32 - ((R)&31)));
}

Member Data Documentation

CONST

uint32_t gpmp::nt::RedPike::CONST = 0x9E3779B9

private

Constant value used in the RedPike algorithm.

Definition at line 70 of file redpike.hpp.

ROUNDS

int gpmp::nt::RedPike::ROUNDS = 16

private

Number of rounds in the RedPike algorithm.

Definition at line 75 of file redpike.hpp.

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The documentation for this class was generated from the following files:

• include/openGPMP/nt/redpike.hpp
• modules/nt/redpike.cpp