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openairinterface5g/openair3/NAS/UE/API/USIM/aka_functions.c
T
gauthier 7b5431a62c renamed openair-cn to openair3 
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7886 818b1a75-f10b-46b9-bf7c-635c3b92a50f
2015-10-06 16:53:42 +00:00

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15 KiB
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/*-------------------------------------------------------------------
* Example algorithms f1, f1*, f2, f3, f4, f5, f5*
*-------------------------------------------------------------------
*
* A sample implementation of the example 3GPP authentication and
* key agreement functions f1, f1*, f2, f3, f4, f5 and f5*. This is
* a byte-oriented implementation of the functions, and of the block
* cipher kernel function Rijndael.
*
* This has been coded for clarity, not necessarily for efficiency.
*
* The functions f2, f3, f4 and f5 share the same inputs and have
* been coded together as a single function. f1, f1* and f5* are
* all coded separately.
* From 3GPP 35.206-900
*-----------------------------------------------------------------*/
#include "aka_functions.h"
#include "nas_log.h"
/*--------- Operator Variant Algorithm Configuration Field --------*/
/*------- Insert your value of OP here -------*/
/* PFT OP used currently in HSS (OPENAIRHSS/auc/kdf.c) */
u8 OP[16] = {0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11
};
/*------- Insert your value of OP here -------*/
/*-------------------------------------------------------------------
* Algorithm f1
*-------------------------------------------------------------------
*
* Computes network authentication code MAC-A from key K, random
* challenge RAND, sequence number SQN and authentication management
* field AMF.
*
*-----------------------------------------------------------------*/
void f1 ( u8 k_pP[16], u8 rand_pP[16], u8 sqn_pP[6], u8 amf_pP[2],
u8 mac_a_pP[8] )
{
u8 op_c[16];
u8 temp[16];
u8 in1[16];
u8 out1[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule( k_pP );
ComputeOPc( op_c );
for (i=0; i<16; i++)
rijndaelInput[i] = rand_pP[i] ^ op_c[i];
RijndaelEncrypt( rijndaelInput, temp );
for (i=0; i<6; i++) {
in1[i] = sqn_pP[i];
in1[i+8] = sqn_pP[i];
}
for (i=0; i<2; i++) {
in1[i+6] = amf_pP[i];
in1[i+14] = amf_pP[i];
}
/* XOR op_c and in1, rotate by r1=64, and XOR *
* on the constant c1 (which is all zeroes) */
for (i=0; i<16; i++)
rijndaelInput[(i+8) % 16] = in1[i] ^ op_c[i];
/* XOR on the value temp computed before */
for (i=0; i<16; i++)
rijndaelInput[i] ^= temp[i];
RijndaelEncrypt( rijndaelInput, out1 );
for (i=0; i<16; i++)
out1[i] ^= op_c[i];
for (i=0; i<8; i++)
mac_a_pP[i] = out1[i];
return;
} /* end of function f1 */
/*-------------------------------------------------------------------
* Algorithms f2-f5
*-------------------------------------------------------------------
*
* Takes key K and random challenge RAND, and returns response RES,
* confidentiality key CK, integrity key IK and anonymity key AK.
*
*-----------------------------------------------------------------*/
void f2345 ( u8 k_pP[16], u8 rand_pP[16],
u8 res_pP[8], u8 ck_pP[16], u8 ik_pP[16], u8 ak_pP[6] )
{
u8 op_c[16];
u8 temp[16];
u8 out[16];
u8 rijndaelInput[16];
u8 i;
LOG_TRACE(DEBUG,
"USIM-API - f2345 : in k[0..15]=%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
k_pP[0],k_pP[1],k_pP[2], k_pP[3], k_pP[4], k_pP[5], k_pP[6], k_pP[7],
k_pP[8],k_pP[9],k_pP[10],k_pP[11],k_pP[12],k_pP[13],k_pP[14],k_pP[15]);
LOG_TRACE(DEBUG,
"USIM-API - f2345 : in rand[0..15]=%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
rand_pP[0],rand_pP[1],rand_pP[2], rand_pP[3], rand_pP[4], rand_pP[5], rand_pP[6], rand_pP[7],
rand_pP[8],rand_pP[9],rand_pP[10],rand_pP[11],rand_pP[12],rand_pP[13],rand_pP[14],rand_pP[15]);
RijndaelKeySchedule( k_pP );
ComputeOPc( op_c );
for (i=0; i<16; i++)
rijndaelInput[i] = rand_pP[i] ^ op_c[i];
RijndaelEncrypt( rijndaelInput, temp );
/* To obtain output block OUT2: XOR OPc and TEMP, *
* rotate by r2=0, and XOR on the constant c2 (which *
* is all zeroes except that the last bit is 1). */
for (i=0; i<16; i++)
rijndaelInput[i] = temp[i] ^ op_c[i];
rijndaelInput[15] ^= 1;
RijndaelEncrypt( rijndaelInput, out );
for (i=0; i<16; i++)
out[i] ^= op_c[i];
for (i=0; i<8; i++)
res_pP[i] = out[i+8];
for (i=0; i<6; i++)
ak_pP[i] = out[i];
LOG_TRACE(DEBUG,
"USIM-API - f2345 : out f2 res[0..7]=%02X%02X%02X%02X%02X%02X%02X%02X",
res_pP[0],res_pP[1],res_pP[2], res_pP[3], res_pP[4], res_pP[5], res_pP[6], res_pP[7]);
LOG_TRACE(DEBUG,
"USIM-API - f2345 : out f5 ak[0..5]=%02X%02X%02X%02X%02X%02X",
ak_pP[0],ak_pP[1],ak_pP[2], ak_pP[3], ak_pP[4], ak_pP[5]);
/* To obtain output block OUT3: XOR OPc and TEMP, *
* rotate by r3=32, and XOR on the constant c3 (which *
* is all zeroes except that the next to last bit is 1). */
for (i=0; i<16; i++)
rijndaelInput[(i+12) % 16] = temp[i] ^ op_c[i];
rijndaelInput[15] ^= 2;
RijndaelEncrypt( rijndaelInput, out );
for (i=0; i<16; i++)
out[i] ^= op_c[i];
for (i=0; i<16; i++)
ck_pP[i] = out[i];
LOG_TRACE(DEBUG,
"USIM-API - f2345 : out f3 ck_pP[0..7]=%02X%02X%02X%02X%02X%02X%02X%02X",
ck_pP[0],ck_pP[1],ck_pP[2], ck_pP[3], ck_pP[4], ck_pP[5], ck_pP[6], ck_pP[7]);
/* To obtain output block OUT4: XOR OPc and TEMP, *
* rotate by r4=64, and XOR on the constant c4 (which *
* is all zeroes except that the 2nd from last bit is 1). */
for (i=0; i<16; i++)
rijndaelInput[(i+8) % 16] = temp[i] ^ op_c[i];
rijndaelInput[15] ^= 4;
RijndaelEncrypt( rijndaelInput, out );
for (i=0; i<16; i++)
out[i] ^= op_c[i];
for (i=0; i<16; i++)
ik_pP[i] = out[i];
LOG_TRACE(DEBUG,
"USIM-API - f2345 : out f4 ik_pP[0..15]=%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
ik_pP[0],ik_pP[1],ik_pP[2], ik_pP[3], ik_pP[4], ik_pP[5], ik_pP[6], ik_pP[7],
ik_pP[8],ik_pP[9],ik_pP[10],ik_pP[11],ik_pP[12],ik_pP[13],ik_pP[14],ik_pP[15]);
return;
} /* end of function f2345 */
/*-------------------------------------------------------------------
* Algorithm f1*
*-------------------------------------------------------------------
*
* Computes resynch authentication code MAC-S from key K, random
* challenge RAND, sequence number SQN and authentication management
* field AMF.
*
*-----------------------------------------------------------------*/
void f1star( u8 k_pP[16], u8 rand_pP[16], u8 sqn_pP[6], u8 amf_pP[2],
u8 mac_s_pP[8] )
{
u8 op_c[16];
u8 temp[16];
u8 in1[16];
u8 out1[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule( k_pP );
ComputeOPc( op_c );
for (i=0; i<16; i++)
rijndaelInput[i] = rand_pP[i] ^ op_c[i];
RijndaelEncrypt( rijndaelInput, temp );
for (i=0; i<6; i++) {
in1[i] = sqn_pP[i];
in1[i+8] = sqn_pP[i];
}
for (i=0; i<2; i++) {
in1[i+6] = amf_pP[i];
in1[i+14] = amf_pP[i];
}
/* XOR op_c and in1, rotate by r1=64, and XOR *
* on the constant c1 (which is all zeroes) */
for (i=0; i<16; i++)
rijndaelInput[(i+8) % 16] = in1[i] ^ op_c[i];
/* XOR on the value temp computed before */
for (i=0; i<16; i++)
rijndaelInput[i] ^= temp[i];
RijndaelEncrypt( rijndaelInput, out1 );
for (i=0; i<16; i++)
out1[i] ^= op_c[i];
for (i=0; i<8; i++)
mac_s_pP[i] = out1[i+8];
return;
} /* end of function f1star */
/*-------------------------------------------------------------------
* Algorithm f5*
*-------------------------------------------------------------------
*
* Takes key K and random challenge RAND, and returns resynch
* anonymity key AK.
*
*-----------------------------------------------------------------*/
void f5star( u8 k_pP[16], u8 rand_pP[16],
u8 ak_pP[6] )
{
u8 op_c[16];
u8 temp[16];
u8 out[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule( k_pP );
ComputeOPc( op_c );
for (i=0; i<16; i++)
rijndaelInput[i] = rand_pP[i] ^ op_c[i];
RijndaelEncrypt( rijndaelInput, temp );
/* To obtain output block OUT5: XOR OPc and TEMP, *
* rotate by r5=96, and XOR on the constant c5 (which *
* is all zeroes except that the 3rd from last bit is 1). */
for (i=0; i<16; i++)
rijndaelInput[(i+4) % 16] = temp[i] ^ op_c[i];
rijndaelInput[15] ^= 8;
RijndaelEncrypt( rijndaelInput, out );
for (i=0; i<16; i++)
out[i] ^= op_c[i];
for (i=0; i<6; i++)
ak_pP[i] = out[i];
return;
} /* end of function f5star */
/*-------------------------------------------------------------------
* Function to compute OPc from OP and K. Assumes key schedule has
already been performed.
*-----------------------------------------------------------------*/
void ComputeOPc( u8 op_c_pP[16] )
{
u8 i;
LOG_TRACE(DEBUG,
"USIM-API - ComputeOPc : OP[0..15]=%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
OP[0],OP[1],OP[2], OP[3], OP[4], OP[5], OP[6], OP[7],
OP[8],OP[9],OP[10],OP[11],OP[12],OP[13],OP[14],OP[15]);
RijndaelEncrypt( OP, op_c_pP );
for (i=0; i<16; i++)
op_c_pP[i] ^= OP[i];
return;
} /* end of function ComputeOPc */
/*-------------------- Rijndael round subkeys ---------------------*/
u8 roundKeys[11][4][4];
/*--------------------- Rijndael S box table ----------------------*/
u8 S[256] = {
99,124,119,123,242,107,111,197, 48, 1,103, 43,254,215,171,118,
202,130,201,125,250, 89, 71,240,173,212,162,175,156,164,114,192,
183,253,147, 38, 54, 63,247,204, 52,165,229,241,113,216, 49, 21,
4,199, 35,195, 24,150, 5,154, 7, 18,128,226,235, 39,178,117,
9,131, 44, 26, 27,110, 90,160, 82, 59,214,179, 41,227, 47,132,
83,209, 0,237, 32,252,177, 91,106,203,190, 57, 74, 76, 88,207,
208,239,170,251, 67, 77, 51,133, 69,249, 2,127, 80, 60,159,168,
81,163, 64,143,146,157, 56,245,188,182,218, 33, 16,255,243,210,
205, 12, 19,236, 95,151, 68, 23,196,167,126, 61,100, 93, 25,115,
96,129, 79,220, 34, 42,144,136, 70,238,184, 20,222, 94, 11,219,
224, 50, 58, 10, 73, 6, 36, 92,194,211,172, 98,145,149,228,121,
231,200, 55,109,141,213, 78,169,108, 86,244,234,101,122,174, 8,
186,120, 37, 46, 28,166,180,198,232,221,116, 31, 75,189,139,138,
112, 62,181,102, 72, 3,246, 14, 97, 53, 87,185,134,193, 29,158,
225,248,152, 17,105,217,142,148,155, 30,135,233,206, 85, 40,223,
140,161,137, 13,191,230, 66,104, 65,153, 45, 15,176, 84,187, 22,
};
/*------- This array does the multiplication by x in GF(2^8) ------*/
u8 Xtime[256] = {
0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30,
32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62,
64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94,
96, 98,100,102,104,106,108,110,112,114,116,118,120,122,124,126,
128,130,132,134,136,138,140,142,144,146,148,150,152,154,156,158,
160,162,164,166,168,170,172,174,176,178,180,182,184,186,188,190,
192,194,196,198,200,202,204,206,208,210,212,214,216,218,220,222,
224,226,228,230,232,234,236,238,240,242,244,246,248,250,252,254,
27, 25, 31, 29, 19, 17, 23, 21, 11, 9, 15, 13, 3, 1, 7, 5,
59, 57, 63, 61, 51, 49, 55, 53, 43, 41, 47, 45, 35, 33, 39, 37,
91, 89, 95, 93, 83, 81, 87, 85, 75, 73, 79, 77, 67, 65, 71, 69,
123,121,127,125,115,113,119,117,107,105,111,109, 99, 97,103,101,
155,153,159,157,147,145,151,149,139,137,143,141,131,129,135,133,
187,185,191,189,179,177,183,181,171,169,175,173,163,161,167,165,
219,217,223,221,211,209,215,213,203,201,207,205,195,193,199,197,
251,249,255,253,243,241,247,245,235,233,239,237,227,225,231,229
};
/*-------------------------------------------------------------------
* Rijndael key schedule function. Takes 16-byte key and creates
* all Rijndael's internal subkeys ready for encryption.
*-----------------------------------------------------------------*/
void RijndaelKeySchedule( u8 key[16] )
{
u8 roundConst;
int i, j;
/* first round key equals key */
for (i=0; i<16; i++)
roundKeys[0][i & 0x03][i>>2] = key[i];
roundConst = 1;
/* now calculate round keys */
for (i=1; i<11; i++) {
roundKeys[i][0][0] = S[roundKeys[i-1][1][3]]
^ roundKeys[i-1][0][0] ^ roundConst;
roundKeys[i][1][0] = S[roundKeys[i-1][2][3]]
^ roundKeys[i-1][1][0];
roundKeys[i][2][0] = S[roundKeys[i-1][3][3]]
^ roundKeys[i-1][2][0];
roundKeys[i][3][0] = S[roundKeys[i-1][0][3]]
^ roundKeys[i-1][3][0];
for (j=0; j<4; j++) {
roundKeys[i][j][1] = roundKeys[i-1][j][1] ^ roundKeys[i][j][0];
roundKeys[i][j][2] = roundKeys[i-1][j][2] ^ roundKeys[i][j][1];
roundKeys[i][j][3] = roundKeys[i-1][j][3] ^ roundKeys[i][j][2];
}
/* update round constant */
roundConst = Xtime[roundConst];
}
return;
} /* end of function RijndaelKeySchedule */
/* Round key addition function */
void KeyAdd(u8 state[4][4], u8 roundKeys[11][4][4], int round)
{
int i, j;
for (i=0; i<4; i++)
for (j=0; j<4; j++)
state[i][j] ^= roundKeys[round][i][j];
return;
}
/* Byte substitution transformation */
int ByteSub(u8 state[4][4])
{
int i, j;
for (i=0; i<4; i++)
for (j=0; j<4; j++)
state[i][j] = S[state[i][j]];
return 0;
}
/* Row shift transformation */
void ShiftRow(u8 state[4][4])
{
u8 temp;
/* left rotate row 1 by 1 */
temp = state[1][0];
state[1][0] = state[1][1];
state[1][1] = state[1][2];
state[1][2] = state[1][3];
state[1][3] = temp;
/* left rotate row 2 by 2 */
temp = state[2][0];
state[2][0] = state[2][2];
state[2][2] = temp;
temp = state[2][1];
state[2][1] = state[2][3];
state[2][3] = temp;
/* left rotate row 3 by 3 */
temp = state[3][0];
state[3][0] = state[3][3];
state[3][3] = state[3][2];
state[3][2] = state[3][1];
state[3][1] = temp;
return;
}
/* MixColumn transformation*/
void MixColumn(u8 state[4][4])
{
u8 temp, tmp, tmp0;
int i;
/* do one column at a time */
for (i=0; i<4; i++) {
temp = state[0][i] ^ state[1][i] ^ state[2][i] ^ state[3][i];
tmp0 = state[0][i];
/* Xtime array does multiply by x in GF2^8 */
tmp = Xtime[state[0][i] ^ state[1][i]];
state[0][i] ^= temp ^ tmp;
tmp = Xtime[state[1][i] ^ state[2][i]];
state[1][i] ^= temp ^ tmp;
tmp = Xtime[state[2][i] ^ state[3][i]];
state[2][i] ^= temp ^ tmp;
tmp = Xtime[state[3][i] ^ tmp0];
state[3][i] ^= temp ^ tmp;
}
return;
}
/*-------------------------------------------------------------------
* Rijndael encryption function. Takes 16-byte input and creates
* 16-byte output (using round keys already derived from 16-byte
* key).
*-----------------------------------------------------------------*/
void RijndaelEncrypt( u8 input[16], u8 output[16] )
{
u8 state[4][4];
int i, r;
/* initialise state array from input byte string */
for (i=0; i<16; i++)
state[i & 0x3][i>>2] = input[i];
/* add first round_key */
KeyAdd(state, roundKeys, 0);
/* do lots of full rounds */
for (r=1; r<=9; r++) {
ByteSub(state);
ShiftRow(state);
MixColumn(state);
KeyAdd(state, roundKeys, r);
}
/* final round */
ByteSub(state);
ShiftRow(state);
KeyAdd(state, roundKeys, r);
/* produce output byte string from state array */
for (i=0; i<16; i++) {
output[i] = state[i & 0x3][i>>2];
}
return;
} /* end of function RijndaelEncrypt */
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