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/* Author: Peter Schwabe, ported from an assembly implementation by Emilia Käsper
* Date: 2009-03-19
* Public domain */
#include "api.h"
#include "int128.h"
#include "common.h"
#include "consts.h"
int crypto_stream_afternm(unsigned char *out, unsigned long long len, const unsigned char *nonce, const unsigned char *c)
{
int128 xmm0;
int128 xmm1;
int128 xmm2;
int128 xmm3;
int128 xmm4;
int128 xmm5;
int128 xmm6;
int128 xmm7;
int128 xmm8;
int128 xmm9;
int128 xmm10;
int128 xmm11;
int128 xmm12;
int128 xmm13;
int128 xmm14;
int128 xmm15;
int128 nonce_stack;
unsigned long long lensav;
unsigned char bl[128];
unsigned char *blp;
unsigned char *np;
unsigned char b;
uint32 tmp;
/* Copy nonce on the stack */
copy2(&nonce_stack, (const int128 *) (nonce + 0));
np = (unsigned char *)&nonce_stack;
enc_block:
xmm0 = *(int128 *) (np + 0);
copy2(&xmm1, &xmm0);
shufb(&xmm1, SWAP32);
copy2(&xmm2, &xmm1);
copy2(&xmm3, &xmm1);
copy2(&xmm4, &xmm1);
copy2(&xmm5, &xmm1);
copy2(&xmm6, &xmm1);
copy2(&xmm7, &xmm1);
add_uint32_big(&xmm1, 1);
add_uint32_big(&xmm2, 2);
add_uint32_big(&xmm3, 3);
add_uint32_big(&xmm4, 4);
add_uint32_big(&xmm5, 5);
add_uint32_big(&xmm6, 6);
add_uint32_big(&xmm7, 7);
shufb(&xmm0, M0);
shufb(&xmm1, M0SWAP);
shufb(&xmm2, M0SWAP);
shufb(&xmm3, M0SWAP);
shufb(&xmm4, M0SWAP);
shufb(&xmm5, M0SWAP);
shufb(&xmm6, M0SWAP);
shufb(&xmm7, M0SWAP);
bitslice(xmm7, xmm6, xmm5, xmm4, xmm3, xmm2, xmm1, xmm0, xmm8)
aesround( 1, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15,c)
aesround( 2, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7,c)
aesround( 3, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15,c)
aesround( 4, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7,c)
aesround( 5, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15,c)
aesround( 6, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7,c)
aesround( 7, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15,c)
aesround( 8, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7,c)
aesround( 9, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15,c)
lastround(xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15, xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7,c)
bitslice(xmm13, xmm10, xmm15, xmm11, xmm14, xmm12, xmm9, xmm8, xmm0)
if(len < 128) goto partial;
if(len == 128) goto full;
tmp = load32_bigendian(np + 12);
tmp += 8;
store32_bigendian(np + 12, tmp);
*(int128 *) (out + 0) = xmm8;
*(int128 *) (out + 16) = xmm9;
*(int128 *) (out + 32) = xmm12;
*(int128 *) (out + 48) = xmm14;
*(int128 *) (out + 64) = xmm11;
*(int128 *) (out + 80) = xmm15;
*(int128 *) (out + 96) = xmm10;
*(int128 *) (out + 112) = xmm13;
len -= 128;
out += 128;
goto enc_block;
partial:
lensav = len;
len >>= 4;
tmp = load32_bigendian(np + 12);
tmp += len;
store32_bigendian(np + 12, tmp);
blp = bl;
*(int128 *)(blp + 0) = xmm8;
*(int128 *)(blp + 16) = xmm9;
*(int128 *)(blp + 32) = xmm12;
*(int128 *)(blp + 48) = xmm14;
*(int128 *)(blp + 64) = xmm11;
*(int128 *)(blp + 80) = xmm15;
*(int128 *)(blp + 96) = xmm10;
*(int128 *)(blp + 112) = xmm13;
bytes:
if(lensav == 0) goto end;
b = blp[0]; /* clang false positive */
*(unsigned char *)(out + 0) = b;
blp += 1;
out +=1;
lensav -= 1;
goto bytes;
full:
tmp = load32_bigendian(np + 12);
tmp += 8;
store32_bigendian(np + 12, tmp);
*(int128 *) (out + 0) = xmm8;
*(int128 *) (out + 16) = xmm9;
*(int128 *) (out + 32) = xmm12;
*(int128 *) (out + 48) = xmm14;
*(int128 *) (out + 64) = xmm11;
*(int128 *) (out + 80) = xmm15;
*(int128 *) (out + 96) = xmm10;
*(int128 *) (out + 112) = xmm13;
end:
return 0;
}
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