3GPP加密核心算法，Kasumi F8/F9解密，C代码
3GPP加密核心算法，Kasumi F8/F9解密算法代码，已实战验证过正确性。
f8.c
/*-------------------------------------------------------------------
*F8-Confidentiality Algorithm
*-------------------------------------------------------------------
*
*A sample implementation of f8,the 3GPP Confidentiality algorithm.
*
*This has been coded for clarity,not necessarily for efficiency.
*
*This will compile and run correctly on both Intel(little endian)
*and Sparc(big endian)machines.(Compilers used supported 32-bit ints)
*
*Version 1.0 05 November 1999
*
*-------------------------------------------------------------------*/
#include "Common.h"
#include "kasumi.h"
/*---------------------------------------------------------
*f8()
*Given key,count,bearer,direction,data,
*and bit length encrypt the bit stream
*---------------------------------------------------------*/
void f8(uint8_t*key,int count,int bearer,int dir,uint8_t*data,int length)
{
REGISTER64 A;/*the modifier*/
REGISTER64 temp;/*The working register*/
int i,n;
uint8_t ModKey[16];/*Modified key*/
uint16_t blkcnt;/*The block counter*/
Kasumi_t sys;
/*Start by building our global modifier*/
temp.b32[0]=temp.b32[1]=0;
A.b32[0]=A.b32[1]=0;
/*initialise register in an endian correct manner*/
A.b8[0]=(uint8_t)(count>>24);
A.b8[1]=(uint8_t)(count>>16);
A.b8[2]=(uint8_t)(count>>8);
A.b8[3]=(uint8_t)(count);
A.b8[4]=(uint8_t)(bearer<<3);
A.b8[4]|=(uint8_t)(dir<<2);
/*Construct the modified key and then"kasumi"A*/
for (n = 0; n < 16; ++n)
{
ModKey[n] = (uint8_t)(key[n] ^ 0x55);
}
KeySchedule(&sys, ModKey);
Kasumi(&sys, A.b8);/*First encryption to create modifier*/
/*Final initialisation steps*/
blkcnt=0;
KeySchedule(&sys, key);
/*Now run the block cipher*/
while (length > 0)
{
/*First we calculate the next 64-bits of keystream*/
/*XOR in A and BLKCNT to last value*/
temp.b32[0] ^= A.b32[0];
temp.b32[1] ^= A.b32[1];
temp.b8[7] ^= (uint8_t)blkcnt;
temp.b8[6] ^= (uint8_t)(blkcnt >> 8);
/*KASUMI it to produce the next block of keystream*/
Kasumi(&sys, temp.b8);
/*Setto the number of bytes of input data*
*we have to modify.(=8 if length<=64)*/
if (length >= 64)
n = 8;
else
n = (length + 7) / 8;
/*XOR the keystream with the input data stream*/
for (i = 0; i < n; ++i)
*data++ ^= temp.b8[i];
length -= 64;/*done another 64 bits*/
++blkcnt;/*increment BLKCNT*/
}
}
/*-----------------------------------------------------------
*e n d o f f 8.c
*-----------------------------------------------------------*/
f9.c
/*-------------------------------------------------------------------
*F9-Integrity Algorithm
*-------------------------------------------------------------------
*
*A sample implementation of f9,the 3GPP Integrity algorithm.
*
*This has been coded for clarity,not necessarily for efficiency.
*
*This will compile and run correctly on both Intel(little endian)
*and Sparc(big endian)machines.(Compilers used supported 32-bit ints)
*
*Version 1.1 05 September 2000
*
*-------------------------------------------------------------------*/
#include "Common.h"
#include "kasumi.h"
/*---------------------------------------------------------
*f9()
*Given key,count,fresh,direction,data,
*and message length,calculate the hash value
*---------------------------------------------------------*/
void f9(uint8_t *key,int count,int fresh,int dir,uint8_t *data,int length, uint8_t mac_i[4])
{
REGISTER64 A;/*Holds the CBC chained data*/
REGISTER64 B;/*Holds the XOR of all KASUMI outputs*/
uint8_t FinalBit[8]={0x80,0x40,0x20,0x10,8,4,2,1};
uint8_t ModKey[16];
Kasumi_t sys;
int i,n;
/*Start by initialising the block cipher*/
KeySchedule(&sys, key);
/*Next initialise the MAC chain.Make sure we*
*have the data in the right byte order.*
*holds our chaining value...*
*is the running XOR of all KASUMI o/ps*/
for(n=0;n<4;++n)
{
A.b8[n]=(uint8_t)(count>>(24-(n*8)));
A.b8[n+4]=(uint8_t)(fresh>>(24-(n*8)));
}
Kasumi(&sys, A.b8);
B.b32[0]=A.b32[0];
B.b32[1]=A.b32[1];
/*Now run the blocks until we reach the last block*/
while(length>=64)
{
for(n=0;n<8;++n)
A.b8[n]^=*data++;
Kasumi(&sys, A.b8);
length-=64;
B.b32[0]^=A.b32[0];/*running XOR across*/
B.b32[1]^=A.b32[1];/*the block outputs*/
}
/*Process whole bytes in the last block*/
n=0;
while(length>=8)
{
A.b8[n++]^=*data++;
length-=8;
}
/*Now add the direction bit to the input bit stream*
*If length(which holds the#of data bits in the*
*last byte)is non-zero we add it in,otherwise*
*it has to start a new byte.*/
if(length)
{
i=*data;
if(dir)
i|=FinalBit[length];
}
else
i=dir?0x80:0;
A.b8[n++]^=(uint8_t)i;
/*Now add in the final'1'bit.The problem here*
*is if the message length happens to be n*64-1.*
*If so we need to process this block and then*
*create a new input block of 0x8000000000000000.*/
if((length==7)&&(n==8))/*then we've filled the block*/
{
Kasumi(&sys, A.b8);
B.b32[0]^=A.b32[0];/*running XOR across*/
B.b32[1]^=A.b32[1];/*the block outputs*/
A.b8[0]^=0x80;/*toggle first bit*/
i=0x80;
n=1;
}
else
{
if(length==7)/*we finished off the last byte*/
A.b8[n]^=0x80;/*so start a new one.....*/
else
A.b8[n-1]^=FinalBit[length+1];
}
Kasumi(&sys, A.b8);
B.b32[0]^=A.b32[0];/*running XOR across*/
B.b32[1]^=A.b32[1];/*the block outputs*/
/*Final step is to KASUMI what we have using the*
*key XORd with 0xAAAA.....*/
for(n=0;n<16;++n)
ModKey[n]=(uint8_t)*key++^0xAA;
KeySchedule(&sys, ModKey);
Kasumi(&sys, B.b8);
/*We return the left-most 32-bits of the result*/
for(n=0;n<4;++n)
mac_i[n]=B.b8[n];
}
/*-----------------------------------------------------------
*end of f9.c
*-----------------------------------------------------------*/
kasumi.h
#ifndef _KASUMI_H_INCLUDE_
#define _KASUMI_H_INCLUDE_
/*---------------------------------------------------------
*Kasumi.h
*---------------------------------------------------------*/
/*-----a 64-bit structure to help with endian issues-----*/
typedef union {
uint32_t b32[2];
uint16_t b16[4];
uint8_t b8[8];
}REGISTER64;
/*--------globals:The subkey arrays-----------------------------------*/
typedef struct
{
uint16_t KLi1[8];
uint16_t KLi2[8];
uint16_t KOi1[8];
uint16_t KOi2[8];
uint16_t KOi3[8];
uint16_t KIi1[8];
uint16_t KIi2[8];
uint16_t KIi3[8];
}Kasumi_t;
#ifdef __cplusplus
extern "C" {
#endif
/*-------------prototypes--------------------------------*/
void Kasumi(Kasumi_t* p_sys, uint8_t *data);
void KeySchedule(Kasumi_t* p_sys, uint8_t *k);
void f9(uint8_t*key,int count,int fresh,int dir,uint8_t*data,int length, uint8_t mac_i[4]);
void f8(uint8_t*key,int count,int bearer,int dir,uint8_t*data,int length);
#ifdef __cplusplus
}
#endif
#endif //_KASUMI_H_INCLUDE_
kasumi.c
/*-----------------------------------------------------------------------
*Kasumi.c
*-----------------------------------------------------------------------
*
*A sample implementation of KASUMI,the core algorithm for the
*3GPP Confidentiality and Integrity algorithms.
*
*This has been coded for clarity,not necessarily for efficiency.
*
*This will compile and run correctly on both Intel(little endian)
*and Sparc(big endian)machines.
*
*Version 1.0 14 October 1999
*
*-----------------------------------------------------------------------*/
#include "Common.h"
#include "Kasumi.h"
/*---------16 bit rotate left------------------------------------------*/
#define ROL16(a,b) (uint16_t)((a<>(16-b)))
/*-------unions:used to remove"endian"issues------------------------*/
typedef union{
uint32_t b32;
uint16_t b16[2];
uint8_t b8[4];
}REGISTER32_t;
typedef union{
uint16_t b16;
uint8_t b8[2];
}REGISTER16_t;
/*---------------------------------------------------------------------
*FI()
*The FI function(fig 3).It includes the S7 and S9 tables.
*Transforms a 16-bit value.
*---------------------------------------------------------------------*/
static uint16_t FI(uint16_t in,uint16_t subkey)
{
uint16_t nine,seven;
static uint16_t S7[]={
54,50,62,56,22,34,94,96,38,6,63,93,2,18,123,33,
55,113,39,114,21,67,65,12,47,73,46,27,25,111,124,81,
53,9,121,79,52,60,58,48,101,127,40,120,104,70,71,43,
20,122,72,61,23,109,13,100,77,1,16,7,82,10,105,98,
117,116,76,11,89,106,0,125,118,99,86,69,30,57,126,87,
112,51,17,5,95,14,90,84,91,8,35,103,32,97,28,66,
102,31,26,45,75,4,85,92,37,74,80,49,68,29,115,44,
64,107,108,24,110,83,36,78,42,19,15,41,88,119,59,3};
static uint16_t S9[]={
167,239,161,379,391,334,9,338,38,226,48,358,452,385,90,397,
183,253,147,331,415,340,51,362,306,500,262,82,216,159,356,177,
175,241,489,37,206,17,0,333,44,254,378,58,143,220,81,400,
95,3,315,245,54,235,218,405,472,264,172,494,371,290,399,76,
165,197,395,121,257,480,423,212,240,28,462,176,406,507,288,223,
501,407,249,265,89,186,221,428,164,74,440,196,458,421,350,163,
232,158,134,354,13,250,491,142,191,69,193,425,152,227,366,135,
344,300,276,242,437,320,113,278,11,243,87,317,36,93,496,27,
487,446,482,41,68,156,457,131,326,403,339,20,39,115,442,124,
475,384,508,53,112,170,479,151,126,169,73,268,279,321,168,364,
363,292,46,499,393,327,324,24,456,267,157,460,488,426,309,229,
439,506,208,271,349,401,434,236,16,209,359,52,56,120,199,277,
465,416,252,287,246,6,83,305,420,345,153,502,65,61,244,282,
173,222,418,67,386,368,261,101,476,291,195,430,49,79,166,330,
280,383,373,128,382,408,155,495,367,388,274,107,459,417,62,454,
132,225,203,316,234,14,301,91,503,286,424,211,347,307,140,374,
35,103,125,427,19,214,453,146,498,314,444,230,256,329,198,285,
50,116,78,410,10,205,510,171,231,45,139,467,29,86,505,32,
72,26,342,150,313,490,431,238,411,325,149,473,40,119,174,355,
185,233,389,71,448,273,372,55,110,178,322,12,469,392,369,190,
1,109,375,137,181,88,75,308,260,484,98,272,370,275,412,111,
336,318,4,504,492,259,304,77,337,435,21,357,303,332,483,18,
47,85,25,497,474,289,100,269,296,478,270,106,31,104,433,84,
414,486,394,96,99,154,511,148,413,361,409,255,162,215,302,201,
266,351,343,144,441,365,108,298,251,34,182,509,138,210,335,133,
311,352,328,141,396,346,123,319,450,281,429,228,443,481,92,404,
485,422,248,297,23,213,130,466,22,217,283,70,294,360,419,127,
312,377,7,468,194,2,117,295,463,258,224,447,247,187,80,398,
284,353,105,390,299,471,470,184,57,200,348,63,204,188,33,451,
97,30,310,219,94,160,129,493,64,179,263,102,189,207,114,402,
438,477,387,122,192,42,381,5,145,118,180,449,293,323,136,380,
43,66,60,455,341,445,202,432,8,237,15,376,436,464,59,461};
/*The sixteen bit input is split into two unequal halves,*
*nine bits and seven bits-as is the subkey*/
nine = (uint16_t)(in >> 7);
seven = (uint16_t)(in & 0x7F);
/*Now run the various operations*/
nine = (uint16_t)(S9[nine] ^ seven);
seven = (uint16_t)(S7[seven] ^ (nine & 0x7F));
seven ^= (subkey >> 9);
nine ^= (subkey & 0x1FF);
nine = (uint16_t)(S9[nine] ^ seven);
seven = (uint16_t)(S7[seven] ^ (nine & 0x7F));
in = (uint16_t)((seven << 9) + nine);
return(in);
}
/*---------------------------------------------------------------------
*FO()
*The FO()function.
*Transforms a 32-bit value.Usesto identify the
*appropriate subkeys to use.
*---------------------------------------------------------------------*/
static uint32_t FO(Kasumi_t* p_sys, uint32_t in,int index)
{
uint16_t left, right;
/*Split the input into two 16-bit words*/
left = (uint16_t)(in >> 16);
right = (uint16_t)in;
/*Now apply the same basic transformation three times*/
left ^= p_sys->KOi1[index];
left = FI(left, p_sys->KIi1[index]);
left ^= right;
right ^= p_sys->KOi2[index];
right = FI(right, p_sys->KIi2[index]);
right ^= left;
left ^= p_sys->KOi3[index];
left = FI(left, p_sys->KIi3[index]);
left ^= right;
in = ((uint32_t)right << 16) + left;
return(in);
}
/*---------------------------------------------------------------------
*FL()
*The FL()function.
*Transforms a 32-bit value.Usesto identify the
*appropriate subkeys to use.
*---------------------------------------------------------------------*/
static uint32_t FL(Kasumi_t* p_sys, uint32_t in,int index)
{
uint16_t l, r, a, b;
/*split out the left and right halves*/
l = (uint16_t)(in >> 16);
r = (uint16_t)(in);
/*do the FL()operations*/
a = (uint16_t)(l&p_sys->KLi1[index]);
r ^= ROL16(a, 1);
b = (uint16_t)(r | p_sys->KLi2[index]);
l ^= ROL16(b, 1);
/*put the two halves back together*/
in = ((uint32_t)l << 16) + r;
return(in);
}
/*---------------------------------------------------------------------
*Kasumi()
*the Main algorithm(fig 1).Apply the same pair of operations
*four times.Transforms the 64-bit input.
*---------------------------------------------------------------------*/
void Kasumi(Kasumi_t* p_sys, uint8_t *data)
{
uint32_t left, right, temp;
REGISTER32_t*d;
int n;
/*Start by getting the data into two 32-bit words(endian corect)*/
d = (REGISTER32_t*)data;
left = ((uint32_t)d[0].b8[0] << 24) + ((uint32_t)d[0].b8[1] << 16) + ((uint32_t)d[0].b8[2] << 8) + ((uint32_t)d[0].b8[3]);
right = ((uint32_t)d[1].b8[0] << 24) + ((uint32_t)d[1].b8[1] << 16) + ((uint32_t)d[1].b8[2] << 8) + ((uint32_t)d[1].b8[3]);
n = 0;
do {
temp = FL(p_sys, left, n);
temp = FO(p_sys, temp, n++);
right ^= temp;
temp = FO(p_sys, right, n);
temp = FL(p_sys, temp, n++);
left ^= temp;
} while (n <= 7);
/*return the correct endian result*/
d[0].b8[0] = (uint8_t)(left >> 24);
d[1].b8[0] = (uint8_t)(right >> 24);
d[0].b8[1] = (uint8_t)(left >> 16);
d[1].b8[1] = (uint8_t)(right >> 16);
d[0].b8[2] = (uint8_t)(left >> 8);
d[1].b8[2] = (uint8_t)(right >> 8);
d[0].b8[3] = (uint8_t)(left);
d[1].b8[3] = (uint8_t)(right);
}
/*---------------------------------------------------------------------
*KeySchedule()
*Build the key schedule.Most"key"operations use 16-bit
*subkeys so we build u16-sized arrays that are"endian"correct.
*---------------------------------------------------------------------*/
void KeySchedule(Kasumi_t* p_sys, uint8_t *k)
{
static uint16_t C[] = {
0x0123,0x4567,0x89AB,0xCDEF,0xFEDC,0xBA98,0x7654,0x3210 };
uint16_t key[8], Kprime[8];
REGISTER16_t*k16;
int n;
/*Start by ensuring the subkeys are endian correct on a 16-bit basis*/
k16 = (REGISTER16_t*)k;
for (n = 0; n < 8; ++n)
{
key[n] = (((uint16_t)k16[n].b8[0] << 8) + ((uint16_t)k16[n].b8[1]));
}
/*Now build the K’[]keys*/
for (n = 0; n < 8; ++n)
Kprime[n] = (uint16_t)(key[n] ^ C[n]);
/*Finally construct the various sub keys*/
for (n = 0; n < 8; ++n)
{
p_sys->KLi1[n] = ROL16(key[n], 1);
p_sys->KLi2[n] = Kprime[(n + 2) & 0x7];
p_sys->KOi1[n] = ROL16(key[(n + 1) & 0x7], 5);
p_sys->KOi2[n] = ROL16(key[(n + 5) & 0x7], 8);
p_sys->KOi3[n] = ROL16(key[(n + 6) & 0x7], 13);
p_sys->KIi1[n] = Kprime[(n + 4) & 0x7];
p_sys->KIi2[n] = Kprime[(n + 3) & 0x7];
p_sys->KIi3[n] = Kprime[(n + 7) & 0x7];
}
}
/*---------------------------------------------------------------------
*e n d o f k a s u m i.c
*---------------------------------------------------------------------*/
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