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#ifndef SPONGE_CRYPTO_H
#define SPONGE_CRYPTO_H
#include <arpa/inet.h>
#include <string.h>
#include "shorttypes.h"
#define ROTL32(x, n) (((x)<<(n)) | ((x)>>(32-(n))))
static void gimli(void *s){
u32 round, column;
u32 x, y, z;
u32 *state = s;
state[ 0] = ntohl(state[ 0]);
state[ 1] = ntohl(state[ 1]);
state[ 2] = ntohl(state[ 2]);
state[ 3] = ntohl(state[ 3]);
state[ 4] = ntohl(state[ 4]);
state[ 5] = ntohl(state[ 5]);
state[ 6] = ntohl(state[ 6]);
state[ 7] = ntohl(state[ 7]);
state[ 8] = ntohl(state[ 8]);
state[ 9] = ntohl(state[ 9]);
state[10] = ntohl(state[10]);
state[11] = ntohl(state[11]);
for (round = 24; round != 0; --round){
for (column = 0; column < 4; ++column){
x = ROTL32(state[ column], 24);
y = ROTL32(state[4 + column], 9);
z = state[8 + column];
state[8 + column] = x ^ (z << 1) ^ ((y&z) << 2);
state[4 + column] = y ^ x ^ ((x|z) << 1);
state[ column] = z ^ y ^ ((x&y) << 3);
}
if ((round & 3) == 0) { // small swap: pattern s...s...s...
x = state[0];
state[0] = state[1];
state[1] = x;
x = state[2];
state[2] = state[3];
state[3] = x;
}
if ((round & 3) == 2) { // big swap: ..S...S...S. etc.
x = state[0];
state[0] = state[2];
state[2] = x;
x = state[1];
state[1] = state[3];
state[3] = x;
}
if ((round & 3) == 0) { // add constant: c...c...c... etc.
state[0] ^= (0x9e377900 | round);
}
}
state[ 0] = htonl(state[ 0]);
state[ 1] = htonl(state[ 1]);
state[ 2] = htonl(state[ 2]);
state[ 3] = htonl(state[ 3]);
state[ 4] = htonl(state[ 4]);
state[ 5] = htonl(state[ 5]);
state[ 6] = htonl(state[ 6]);
state[ 7] = htonl(state[ 7]);
state[ 8] = htonl(state[ 8]);
state[ 9] = htonl(state[ 9]);
state[10] = htonl(state[10]);
state[11] = htonl(state[11]);
}
#define FPERMUTE gimli
#define MEMXOR16(dst, src) \
((u32*)dst)[0] ^= ((u32*)src)[0]; \
((u32*)dst)[1] ^= ((u32*)src)[1]; \
((u32*)dst)[2] ^= ((u32*)src)[2]; \
((u32*)dst)[3] ^= ((u32*)src)[3]
#define MEMXOR32(dst, src) \
((u32*)dst)[0] ^= ((u32*)src)[0]; \
((u32*)dst)[1] ^= ((u32*)src)[1]; \
((u32*)dst)[2] ^= ((u32*)src)[2]; \
((u32*)dst)[3] ^= ((u32*)src)[3]; \
((u32*)dst)[4] ^= ((u32*)src)[4]; \
((u32*)dst)[5] ^= ((u32*)src)[5]; \
((u32*)dst)[6] ^= ((u32*)src)[6]; \
((u32*)dst)[7] ^= ((u32*)src)[7]
/* reseedable prng
* state[12]: input buffer index
* state[13]: output buffer index
*/
static void duplex257_prng_feed(u32 state[14], u32 food){
state[13] = 0;
state[state[12]] ^= food;
state[12]++;
if (state[12] == 8){
((u8*)state)[32] ^= 0x80;
state[12] = 0;
FPERMUTE(state);
}
return;
}
static u32 duplex257_prng_rand(u32 state[14]){
u32 res;
if (state[12]){
((u8*)state)[state[12]] ^= 0x80;
FPERMUTE(state);
state[12] = 0;
state[13] = 1;
return state[0];
}
res = state[state[13]];
state[13]++;
if (state[13] == 8){
state[13] = 0;
((u8*)state)[0] ^= 0x80;
FPERMUTE(state);
}
return res;
}
static void duplex257_prng_rand16(u32 state[14], u8 dst[16]){
if (state[12]){
((u8*)state)[state[12]] ^= 0x80;
FPERMUTE(state);
state[12] = 0;
state[13] = 4;
memcpy(dst, state, 16);
return;
}
if (state[13] == 0){
state[13] = 4;
memcpy(dst, state, 16);
} else if (state[13] < 5){
state[13] = 0;
memcpy(dst, &state[4], 16);
((u8*)state)[0] ^= 0x80;
FPERMUTE(state);
} else {
((u8*)state)[0] ^= 0x80;
FPERMUTE(state);
state[13] = 4;
memcpy(dst, state, 16);
}
return;
}
/* duplex257 AE */
static void duplex257_ae_encrypt
(const u8 key[32], const u8 nonce[16], u8 tag[16], u8 *src_dst, u32 sz){
static u8 state[48];
u32 i, n;
/* duplex_mute(key) */
memcpy(state, key, 32);
state[32] = 0x80;
FPERMUTE(state);
/* duplex_mute(nonce) */
MEMXOR16(state, nonce);
state[16] ^= 0x80;
FPERMUTE(state);
/* 32 bytes steps */
n = sz >> 5;
while (n){
/* duplex(src_dst), encrypt */
MEMXOR32(src_dst, state);
memcpy(state, src_dst, 32);
state[32] ^= 0x80;
FPERMUTE(state);
src_dst += 32;
n--;
}
/* 1 byte steps */
n = sz & 0x1Fu;
/* duplex(src_dst), encrypt */
for (i = 0; i < n; i++) src_dst[i] ^= state[i];
memcpy(state, src_dst, n);
state[n] ^= 0x80;
FPERMUTE(state);
memcpy(tag, state, 16);
memset(state, 0, sizeof(state));
return;
}
static void duplex257_ae_decrypt
(const u8 key[32], const u8 nonce[16], u8 tag[16], u8 *src_dst, u32 sz){
static u8 state[48];
u32 i, n;
/* duplex_mute(key) */
memcpy(state, key, 32);
state[32] = 0x80;
FPERMUTE(state);
/* duplex_mute(nonce) */
MEMXOR16(state, nonce);
state[16] ^= 0x80;
FPERMUTE(state);
/* 32 bytes steps */
n = sz >> 5;
while (n){
/* duplex(src_dst), encrypt */
MEMXOR32(src_dst, state);
MEMXOR32(state, src_dst);
state[32] ^= 0x80;
FPERMUTE(state);
src_dst += 32;
n--;
}
/* 1 byte steps */
n = sz & 0x1Fu;
/* duplex(src_dst), encrypt */
for (i = 0; i < n; i++){
src_dst[i] ^= state[i];
state[i] ^= src_dst[i];
}
state[n] ^= 0x80;
FPERMUTE(state);
memcpy(tag, state, 16);
memset(state, 0, sizeof(state));
return;
}
/* sponge */
static void sponge256_absorb(u8 state[48], const u8 *src, u32 sz){
u32 n, i;
n = sz >> 5;
while (n){ /* 32 byte steps */
MEMXOR32(state, src);
FPERMUTE(state);
src += 32;
n--;
}
/* 1 byte steps */
n = sz & 0x1Fu;
for (i=0; i < n; i++) state[i] ^= src[i];
state[i] ^= 0x80;
FPERMUTE(state);
return;
}
/* sponge hash */
static void sponge256_hash32(u8 dst[32], u8 *src, u32 sz){
static u8 state[48];
sponge256_absorb(state, src, sz);
memcpy(dst, state, 32);
memset(state, 0, sizeof(state));
return;
}
#endif /* SPONGE_CRYPTO_H */
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