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| extern unsigned long long getcyclecount();
/* This code is based on the
* Reference implementation of the TRIVIUM stream cipher
* Christophe De Canniere, K.U.Leuven.
*/
typedef unsigned int u32;
typedef unsigned char u8;
typedef struct {
u32 keylen;
u32 ivlen;
u8 s[40];
u8 key[10];
} ECRYPT_ctx;
#define U32TO8_LITTLE(p, v) (((u32*)(p))[0] = U32TO32_LITTLE(v))
#define U8TO32_LITTLE(p) U32TO32_LITTLE(((u32*)(p))[0])
#define U32TO32_LITTLE(v) (v)
#define S00(a, b) ((S(a, 1) << ( 32 - (b))))
#define S32(a, b) ((S(a, 2) << ( 64 - (b))) | (S(a, 1) >> ((b) - 32)))
#define S64(a, b) ((S(a, 3) << ( 96 - (b))) | (S(a, 2) >> ((b) - 64)))
#define S96(a, b) ((S(a, 4) << (128 - (b))) | (S(a, 3) >> ((b) - 96)))
#define UPDATE() \
do { \
T(1) = S64(1, 66) ^ S64(1, 93); \
T(2) = S64(2, 69) ^ S64(2, 84); \
T(3) = S64(3, 66) ^ S96(3, 111); \
\
Z(T(1) ^ T(2) ^ T(3)); \
\
T(1) ^= (S64(1, 91) & S64(1, 92)) ^ S64(2, 78); \
T(2) ^= (S64(2, 82) & S64(2, 83)) ^ S64(3, 87); \
T(3) ^= (S96(3, 109) & S96(3, 110)) ^ S64(1, 69); \
} while (0)
#define ROTATE() \
do { \
S(1, 3) = S(1, 2); S(1, 2) = S(1, 1); S(1, 1) = T(3); \
S(2, 3) = S(2, 2); S(2, 2) = S(2, 1); S(2, 1) = T(1); \
S(3, 4) = S(3, 3); S(3, 3) = S(3, 2); S(3, 2) = S(3, 1); S(3, 1) = T(2); \
} while (0)
#define LOAD(s) \
do { \
S(1, 1) = U8TO32_LITTLE((s) + 0); \
S(1, 2) = U8TO32_LITTLE((s) + 4); \
S(1, 3) = U8TO32_LITTLE((s) + 8); \
\
S(2, 1) = U8TO32_LITTLE((s) + 12); \
S(2, 2) = U8TO32_LITTLE((s) + 16); \
S(2, 3) = U8TO32_LITTLE((s) + 20); \
\
S(3, 1) = U8TO32_LITTLE((s) + 24); \
S(3, 2) = U8TO32_LITTLE((s) + 28); \
S(3, 3) = U8TO32_LITTLE((s) + 32); \
S(3, 4) = U8TO32_LITTLE((s) + 36); \
} while (0)
#define STORE(s) \
do { \
U32TO8_LITTLE((s) + 0, S(1, 1)); \
U32TO8_LITTLE((s) + 4, S(1, 2)); \
U32TO8_LITTLE((s) + 8, S(1, 3)); \
\
U32TO8_LITTLE((s) + 12, S(2, 1)); \
U32TO8_LITTLE((s) + 16, S(2, 2)); \
U32TO8_LITTLE((s) + 20, S(2, 3)); \
\
U32TO8_LITTLE((s) + 24, S(3, 1)); \
U32TO8_LITTLE((s) + 28, S(3, 2)); \
U32TO8_LITTLE((s) + 32, S(3, 3)); \
U32TO8_LITTLE((s) + 36, S(3, 4)); \
} while (0)
void ECRYPT_keysetup(
ECRYPT_ctx* ctx,
const u8* key,
u32 keysize,
u32 ivsize)
{
u32 i;
ctx->keylen = (keysize + 7) / 8;
ctx->ivlen = (ivsize + 7) / 8;
for (i = 0; i < ctx->keylen; ++i)
ctx->key[i] = key[i];
}
#define S(a, n) (s##a##n)
#define T(a) (t##a)
void ECRYPT_ivsetup(
ECRYPT_ctx* ctx,
const u8* iv)
{
u32 i;
u32 s11, s12, s13;
u32 s21, s22, s23;
u32 s31, s32, s33, s34;
for (i = 0; i < ctx->keylen; ++i)
ctx->s[i] = ctx->key[i];
for (i = ctx->keylen; i < 12; ++i)
ctx->s[i] = 0;
for (i = 0; i < ctx->ivlen; ++i)
ctx->s[i + 12] = iv[i];
for (i = ctx->ivlen; i < 12; ++i)
ctx->s[i + 12] = 0;
for (i = 0; i < 13; ++i)
ctx->s[i + 24] = 0;
ctx->s[13 + 24] = 0x70;
LOAD(ctx->s);
#define Z(w)
for (i = 0; i < 4 * 9; ++i)
{
u32 t1, t2, t3;
UPDATE();
ROTATE();
}
STORE(ctx->s);
}
void ECRYPT_process_bytes(
int action,
ECRYPT_ctx* ctx,
const u8* input,
u8* output,
u32 msglen)
{
u32 i;
u32 s11, s12, s13;
u32 s21, s22, s23;
u32 s31, s32, s33, s34;
u32 z;
LOAD(ctx->s);
#undef Z
#define Z(w) (U32TO8_LITTLE(output + 4 * i, U8TO32_LITTLE(input + 4 * i) ^ w))
for (i = 0; i < msglen / 4; ++i)
{
u32 t1, t2, t3;
UPDATE();
ROTATE();
}
#undef Z
#define Z(w) (z = w)
STORE(ctx->s);
}
/* ------------------------------------------------------------------------- */
int main() {
ECRYPT_ctx trivium_state;
u8 key[10] = {0x80, 0, 0, 0, 0, 0, 0, 0};
u8 iv[10] = { 0, 0, 0, 0, 0, 0, 0, 0};
u8 input[2048];
u8 output[2048];
unsigned i;
unsigned long long c0, c1, c2;
memset(input, 0, 512);
c0 = getcyclecount();
ECRYPT_keysetup(&trivium_state, key, 10, 10);
ECRYPT_ivsetup (&trivium_state, iv);
c1 = getcyclecount();
ECRYPT_process_bytes(0, &trivium_state, input, output, 2048);
c2 = getcyclecount();
for (i=0; i<16; i++)
printf("%x\n", output[i]);
printf("key schedule cycles: %lld stream cycles: %lld\n", c1 - c0, c2 - c1);
return 0;
} |
(
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