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/*
chacha.c version $Date: 2014/09/08 17:38:05 $
D. J. Bernstein
Romain Dolbeau
Public domain.
*/
// Modified by kerukuro for use in cppcrypto.
/* Adapted to VeraCrypt */
#include "Common/Tcdefs.h"
#include "config.h"
#include "cpu.h"
#include "misc.h"
#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
#ifndef _M_X64
#ifdef _MSC_VER
#if _MSC_VER < 1900
__inline __m128i _mm_set_epi64x(int64 i0, int64 i1) {
union {
int64 q[2];
int32 r[4];
} u;
u.q[0] = i1; u.q[1] = i0;
// this is inefficient, but other solutions are worse
return _mm_setr_epi32(u.r[0], u.r[1], u.r[2], u.r[3]);
}
#pragma warning(disable:4799)
__inline __m128i _mm_set1_epi64x(int64 a)
{
union {
__m64 m;
long long ii;
} u;
u.ii = a;
return _mm_set1_epi64(u.m);
}
#pragma warning(default:4799)
#endif
#endif
#endif
#define uint8 byte
#define U32V(v) (v)
#define ROTL32(x,n) rotl32(x, n)
#define U32TO8_LITTLE(p, v) (((uint32*)(p))[0] = (v))
#define U8TO32_LITTLE(v) *((uint32*)(v))
#define ROTATE(v,c) (ROTL32(v,c))
#define XOR(v,w) ((v) ^ (w))
#define PLUS(v,w) (U32V((v) + (w)))
#define PLUSONE(v) (PLUS((v),1))
#define QUARTERROUND(a,b,c,d) \
x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]),16); \
x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]),12); \
x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]), 8); \
x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]), 7);
static void salsa20_wordtobyte(uint8 output[64],const uint32 input[16], unsigned int r)
{
uint32 x[16];
int i;
for (i = 0;i < 16;++i) x[i] = input[i];
for (i = r;i > 0;--i) {
QUARTERROUND( 0, 4, 8,12)
QUARTERROUND( 1, 5, 9,13)
QUARTERROUND( 2, 6,10,14)
QUARTERROUND( 3, 7,11,15)
QUARTERROUND( 0, 5,10,15)
QUARTERROUND( 1, 6,11,12)
QUARTERROUND( 2, 7, 8,13)
QUARTERROUND( 3, 4, 9,14)
}
for (i = 0;i < 16;++i) x[i] = PLUS(x[i],input[i]);
for (i = 0;i < 16;++i) U32TO8_LITTLE(output + 4 * i,x[i]);
}
void chacha_ECRYPT_init(void)
{
return;
}
static const char sigma[17] = "expand 32-byte k";
static const char tau[17] = "expand 16-byte k";
void chacha_ECRYPT_keysetup(uint32* input,const uint8 *k,uint32 kbits,uint32 ivbits)
{
const char *constants;
input[4] = U8TO32_LITTLE(k + 0);
input[5] = U8TO32_LITTLE(k + 4);
input[6] = U8TO32_LITTLE(k + 8);
input[7] = U8TO32_LITTLE(k + 12);
if (kbits == 256) { /* recommended */
k += 16;
constants = sigma;
} else { /* kbits == 128 */
constants = tau;
}
input[8] = U8TO32_LITTLE(k + 0);
input[9] = U8TO32_LITTLE(k + 4);
input[10] = U8TO32_LITTLE(k + 8);
input[11] = U8TO32_LITTLE(k + 12);
input[0] = U8TO32_LITTLE(constants + 0);
input[1] = U8TO32_LITTLE(constants + 4);
input[2] = U8TO32_LITTLE(constants + 8);
input[3] = U8TO32_LITTLE(constants + 12);
}
void chacha_ECRYPT_ivsetup(uint32* input,const uint8 *iv)
{
input[12] = 0;
input[13] = 0;
input[14] = U8TO32_LITTLE(iv + 0);
input[15] = U8TO32_LITTLE(iv + 4);
}
void chacha_ECRYPT_encrypt_bytes(size_t bytes, uint32* x, const uint8* m, uint8* out, uint8* output, unsigned int r)
{
unsigned int i;
#include "chacha_u4.h"
#include "chacha_u1.h"
#ifndef _M_X64
#ifdef _MSC_VER
#if _MSC_VER < 1900
_mm_empty();
#endif
#endif
#endif
if (!bytes) return;
for (;;) {
salsa20_wordtobyte(output,x, r);
x[12] = PLUSONE(x[12]);
if (!x[12]) {
x[13] = PLUSONE(x[13]);
/* stopping at 2^70 bytes per nonce is user's responsibility */
}
if (bytes <= 64) {
for (i = 0;i < bytes;++i) out[i] = m[i] ^ output[i];
return;
}
for (i = 0;i < 64;++i) out[i] = m[i] ^ output[i];
bytes -= 64;
out += 64;
m += 64;
}
}
#endif
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