milenage.c
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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.
*
*-----------------------------------------------------------------*/
#include "milenage.h"
#include "rijndael.h"
/*--------- Operator Variant Algorithm Configuration Field --------*/
/*------- Insert your value of OP here -------*/
/*u8 OP[16] = {0x63, 0xbf, 0xa5, 0x0e, 0xe6, 0x52, 0x33, 0x65,
0xff, 0x14, 0xc1, 0xf4, 0x5f, 0x88, 0x73, 0x7d};
*/
u8 OP[16] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
/*------- Insert your value of OP here -------*/
/*--------------------------- prototypes --------------------------*/
/*-------------------------------------------------------------------
* 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[16], u8 rand[16], u8 sqn[6], u8 amf[2], u8 mac_a[8]) {
u8 op_c[16];
u8 temp[16];
u8 in1[16];
u8 out1[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule(k);
ComputeOPc(op_c);
for (i = 0; i < 16; i++)
rijndaelInput[i] = rand[i] ^ op_c[i];
RijndaelEncrypt(rijndaelInput, temp);
for (i = 0; i < 6; i++) {
in1[i] = sqn[i];
in1[i + 8] = sqn[i];
}
for (i = 0; i < 2; i++) {
in1[i + 6] = amf[i];
in1[i + 14] = amf[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[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[16], u8 rand[16], u8 res[8], u8 ck[16], u8 ik[16], u8 ak[6]) {
u8 op_c[16];
u8 temp[16];
u8 out[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule(k);
ComputeOPc(op_c);
for (i = 0; i < 16; i++)
rijndaelInput[i] = rand[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[i] = out[i + 8];
for (i = 0; i < 6; i++)
ak[i] = out[i];
/* 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[i] = out[i];
/* 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[i] = out[i];
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[16], u8 rand[16], u8 sqn[6], u8 amf[2], u8 mac_s[8]) {
u8 op_c[16];
u8 temp[16];
u8 in1[16];
u8 out1[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule(k);
ComputeOPc(op_c);
for (i = 0; i < 16; i++)
rijndaelInput[i] = rand[i] ^ op_c[i];
RijndaelEncrypt(rijndaelInput, temp);
for (i = 0; i < 6; i++) {
in1[i] = sqn[i];
in1[i + 8] = sqn[i];
}
for (i = 0; i < 2; i++) {
in1[i + 6] = amf[i];
in1[i + 14] = amf[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[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[16], u8 rand[16], u8 ak[6]) {
u8 op_c[16];
u8 temp[16];
u8 out[16];
u8 rijndaelInput[16];
u8 i;
RijndaelKeySchedule(k);
ComputeOPc(op_c);
for (i = 0; i < 16; i++)
rijndaelInput[i] = rand[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[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[16]) {
u8 i;
RijndaelEncrypt(OP, op_c);
for (i = 0; i < 16; i++)
op_c[i] ^= OP[i];
return;
} /* end of function ComputeOPc */