/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* X-macro-enabled listing of all intergers in [0, 4]
*/
#define LIST_5 X(0) X(1) X(2) X(3) X(4)
/**
* X-macro-enabled listing of all intergers in [0, 7]
*/
#define LIST_8 LIST_5 X(5) X(6) X(7)
/**
* X-macro-enabled listing of all intergers in [0, 24]
*/
#define LIST_25 LIST_8 X(8) X(9) X(10) X(11) X(12) X(13) X(14) X(15)\
X(16) X(17) X(18) X(19) X(20) X(21) X(22) X(23) X(24)
#define X(N) (N % 5) * 5 + N / 5,
/**
* The order the lanes should be read when absorbing or squeezing,
* it transposes the lanes in the sponge
*/
static const long int LANE_TRANSPOSE_MAP[] = { LIST_25 };
#undef X
/**
* Keccak-f round constants
*/
static const uint_fast64_t RC[] = {
0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808AULL, 0x8000000080008000ULL,
0x000000000000808BULL, 0x0000000080000001ULL, 0x8000000080008081ULL, 0x8000000000008009ULL,
0x000000000000008AULL, 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000AULL,
0x000000008000808BULL, 0x800000000000008BULL, 0x8000000000008089ULL, 0x8000000000008003ULL,
0x8000000000008002ULL, 0x8000000000000080ULL, 0x000000000000800AULL, 0x800000008000000AULL,
0x8000000080008081ULL, 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL
};
/**
* Rotate a word
*
* @param x:int_fast64_t The value to rotate
* @param n:long Rotation steps, may be zero mod `w`
* @param w:long `state->w`
* @param wmod:int_fast64_t `state->wmod`
* @return :int_fast64_t The value rotated
*/
#define rotate(x, n, w, wmod) ((((x) >> ((w) - ((n) % (w)))) | ((x) << ((n) % (w)))) & (wmod))
/**
* Rotate a 64-bit word
*
* @param x:int_fast64_t The value to rotate
* @param n:long Rotation steps, may not be zero
* @return :int_fast64_t The value rotated
*/
#define rotate64(x, n) ((int_fast64_t)(((uint64_t)(x) >> (64L - (n))) | ((uint64_t)(x) << (n))))
/**
* Perform one round of computation
*
* @param state The hashing state
* @param rc The round contant for this round
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __hot__)))
static void
libkeccak_f_round(register struct libkeccak_state *restrict state, register int_fast64_t rc)
{
int_fast64_t *restrict A = state->S;
int_fast64_t B[25];
int_fast64_t C[5];
int_fast64_t da, db, dc, dd, de;
int_fast64_t wmod = state->wmod;
long int w = state->w;
/* θ step (step 1 of 3). */
#define X(N) C[N] = A[N * 5] ^ A[N * 5 + 1] ^ A[N * 5 + 2] ^ A[N * 5 + 3] ^ A[N * 5 + 4];
LIST_5
#undef X
/* θ step (step 2 of 3). */
da = C[4] ^ rotate(C[1], 1, w, wmod);
dd = C[2] ^ rotate(C[4], 1, w, wmod);
db = C[0] ^ rotate(C[2], 1, w, wmod);
de = C[3] ^ rotate(C[0], 1, w, wmod);
dc = C[1] ^ rotate(C[3], 1, w, wmod);
/* ρ and π steps, with last two part of θ. */
#define X(bi, ai, dv, r) B[bi] = rotate(A[ai] ^ dv, r, w, wmod)
B[0] = A[0] ^ da; X( 1, 15, dd, 28); X( 2, 5, db, 1); X( 3, 20, de, 27); X( 4, 10, dc, 62);
X( 5, 6, db, 44); X( 6, 21, de, 20); X( 7, 11, dc, 6); X( 8, 1, da, 36); X( 9, 16, dd, 55);
X(10, 12, dc, 43); X(11, 2, da, 3); X(12, 17, dd, 25); X(13, 7, db, 10); X(14, 22, de, 39);
X(15, 18, dd, 21); X(16, 8, db, 45); X(17, 23, de, 8); X(18, 13, dc, 15); X(19, 3, da, 41);
X(20, 24, de, 14); X(21, 14, dc, 61); X(22, 4, da, 18); X(23, 19, dd, 56); X(24, 9, db, 2);
#undef X
/* ξ step. */
#define X(N) A[N] = B[N] ^ ((~(B[(N + 5) % 25])) & B[(N + 10) % 25]);
LIST_25
#undef X
/* ι step. */
A[0] ^= rc;
}
/**
* 64-bit word version of `libkeccak_f_round`
*
* @param state The hashing state
* @param rc The round contant for this round
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __hot__)))
static void
libkeccak_f_round64(register struct libkeccak_state *restrict state, register int_fast64_t rc)
{
int_fast64_t *restrict A = state->S;
int_fast64_t B[25];
int_fast64_t C[5];
int_fast64_t da, db, dc, dd, de;
/* θ step (step 1 of 3). */
#define X(N) C[N] = A[N * 5] ^ A[N * 5 + 1] ^ A[N * 5 + 2] ^ A[N * 5 + 3] ^ A[N * 5 + 4];
LIST_5
#undef X
/* θ step (step 2 of 3). */
da = C[4] ^ rotate64(C[1], 1);
dd = C[2] ^ rotate64(C[4], 1);
db = C[0] ^ rotate64(C[2], 1);
de = C[3] ^ rotate64(C[0], 1);
dc = C[1] ^ rotate64(C[3], 1);
/* ρ and π steps, with last two part of θ. */
#define X(bi, ai, dv, r) B[bi] = rotate64(A[ai] ^ dv, r)
B[0] = A[0] ^ da; X( 1, 15, dd, 28); X( 2, 5, db, 1); X( 3, 20, de, 27); X( 4, 10, dc, 62);
X( 5, 6, db, 44); X( 6, 21, de, 20); X( 7, 11, dc, 6); X( 8, 1, da, 36); X( 9, 16, dd, 55);
X(10, 12, dc, 43); X(11, 2, da, 3); X(12, 17, dd, 25); X(13, 7, db, 10); X(14, 22, de, 39);
X(15, 18, dd, 21); X(16, 8, db, 45); X(17, 23, de, 8); X(18, 13, dc, 15); X(19, 3, da, 41);
X(20, 24, de, 14); X(21, 14, dc, 61); X(22, 4, da, 18); X(23, 19, dd, 56); X(24, 9, db, 2);
#undef X
/* ξ step. */
#define X(N) A[N] = B[N] ^ ((~(B[(N + 5) % 25])) & B[(N + 10) % 25]);
LIST_25
#undef X
/* ι step. */
A[0] ^= rc;
}
/**
* Convert a chunk of bytes to a lane
*
* @param state The hashing state
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __gnu_inline__)))
static inline void
libkeccak_f(register struct libkeccak_state *restrict state)
{
register long int i = 0;
register long int nr = state->nr;
register long int wmod = state->wmod;
if (nr == 24) {
for (; i < nr; i++)
libkeccak_f_round64(state, (int_fast64_t)(RC[i]));
} else {
for (; i < nr; i++)
libkeccak_f_round(state, (int_fast64_t)(RC[i] & (uint_fast64_t)wmod));
}
}
/**
* Convert a chunk of bytes to a lane
*
* @param message The message
* @param msglen The length of the message
* @param rr Bitrate in bytes
* @param ww Word size in bytes
* @param off The offset in the message
* @return The lane
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __pure__, __warn_unused_result__, __gnu_inline__)))
static inline int_fast64_t
libkeccak_to_lane(register const unsigned char *restrict message, register size_t msglen,
register long int rr, register long int ww, size_t off)
{
register long int n = (long)((msglen < (size_t)rr ? msglen : (size_t)rr) - off);
int_fast64_t rc = 0;
message += off;
while (ww--) {
rc <<= 8;
rc |= __builtin_expect(ww < n, 1) ? (int_fast64_t)(unsigned char)(message[ww]) : 0L;
}
return rc;
}
/**
* 64-bit lane version of `libkeccak_to_lane`
*
* @param message The message
* @param msglen The length of the message
* @param rr Bitrate in bytes
* @param off The offset in the message
* @return The lane
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __pure__, __hot__, __warn_unused_result__, __gnu_inline__)))
static inline int_fast64_t
libkeccak_to_lane64(register const unsigned char *restrict message, register size_t msglen, register long int rr, size_t off)
{
register long int n = (long)((msglen < (size_t)rr ? msglen : (size_t)rr) - off);
int_fast64_t rc = 0;
message += off;
#define X(N) if (__builtin_expect(N < n, 1)) rc |= (int_fast64_t)(unsigned char)(message[N]) << (N * 8);\
else return rc;
LIST_8
#undef X
return rc;
}
/**
* Right-pad message with a 10*1-pad
*
* @param r Should be `state->r` where `state` is the hashing state
* @param msg The message to append padding to; should have `r / 8`
* extra bytes allocated at the end for the function to
* write the pad to
* @param msglen The length of the message to append padding to
* @param bits The number of bits in the end of the message that does not make a whole byte
* @return The length of the message after padding
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __gnu_inline__)))
static inline size_t
libkeccak_pad10star1(register size_t r, unsigned char *msg, size_t msglen, register size_t bits)
{
register size_t nrf = msglen - !!bits;
register size_t len = (nrf << 3) | bits;
register size_t ll = len % r;
register unsigned char b = (unsigned char)(bits ? (msg[nrf] | (1 << bits)) : 1);
if (r - 8 <= ll && ll <= r - 2) {
msg[nrf] = (unsigned char)(b ^ 0x80);
msglen = nrf + 1;
} else {
len = ++nrf << 3;
len = (len - (len % r) + (r - 8)) >> 3;
msglen = len + 1;
msg[nrf - 1] = b;
__builtin_memset(&msg[nrf], 0, (len - nrf) * sizeof(char));
msg[len] = (unsigned char)0x80;
}
return msglen;
}
/**
* Perform the absorption phase
*
* @param state The hashing state
* @param message The bytes to absorb
* @param len The number of bytes from `message` to absorb
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__)))
static void
libkeccak_absorption_phase(register struct libkeccak_state *restrict state,
register const unsigned char *restrict message, register size_t len)
{
register long int rr = state->r >> 3;
register long int ww = state->w >> 3;
register long int n = (long)len / rr;
if (__builtin_expect(ww >= 8, 1)) { /* ww > 8 is impossible, it is just for optimisation possibilities. */
while (n--) {
#define X(N) state->S[N] ^= libkeccak_to_lane64(message, len, rr, (size_t)(LANE_TRANSPOSE_MAP[N] * 8));
LIST_25
#undef X
libkeccak_f(state);
message += (size_t)rr;
len -= (size_t)rr;
}
} else {
while (n--) {
#define X(N) state->S[N] ^= libkeccak_to_lane(message, len, rr, ww, (size_t)(LANE_TRANSPOSE_MAP[N] * ww));
LIST_25
#undef X
libkeccak_f(state);
message += (size_t)rr;
len -= (size_t)rr;
}
}
}
/**
* Perform the squeezing phase
*
* @param state The hashing state
* @param rr The bitrate in bytes
* @param nn The output size in bytes, rounded up to whole bytes
* @param ww The word size in bytes
* @param hashsum Output parameter for the hashsum
*/
LIBKECCAK_GCC_ONLY(__attribute__((__nonnull__, __nothrow__, __hot__)))
static void
libkeccak_squeezing_phase(register struct libkeccak_state *restrict state, long int rr,
long int nn, long int ww, register unsigned char *restrict hashsum)
{
register int_fast64_t v;
register long int ni = rr / ww;
auto long int olen = state->n;
auto long int i, j = 0;
register long int k;
while (olen > 0) {
for (i = 0; i < ni && j < nn; i++) {
v = state->S[LANE_TRANSPOSE_MAP[i]];
for (k = 0; k++ < ww && j++ < nn; v >>= 8)
*hashsum++ = (unsigned char)v;
}
olen -= state->r;
if (olen > 0)
libkeccak_f(state);
}
if (state->n & 7)
hashsum[-1] &= (unsigned char)((1 << (state->n & 7)) - 1);
}
/**
* Absorb more of the message to the Keccak sponge
* without copying the data to an internal buffer
*
* It is safe run zero-copy functions before non-zero-copy
* functions for the same state, running zero-copy functions
* after non-zero-copy functions on the other hand can
* cause the message to be misread
*
* @param state The hashing state
* @param msg The partial message
* @param msglen The length of the partial message; must be a
* multiple of `libkeccak_zerocopy_chunksize(state)`
* (undefined behaviour otherwise)
*/
void
libkeccak_zerocopy_update(struct libkeccak_state *restrict state, const void *restrict msg, size_t msglen)
{
libkeccak_absorption_phase(state, msg, msglen);
}
/**
* Absorb more of the message to the Keccak sponge
* without wiping sensitive data when possible
*
* @param state The hashing state
* @param msg The partial message
* @param msglen The length of the partial message
* @return Zero on success, -1 on error
*/
int
libkeccak_fast_update(struct libkeccak_state *restrict state, const void *restrict msg, size_t msglen)
{
size_t len;
auto unsigned char *restrict new;
if (__builtin_expect(state->mptr + msglen > state->mlen, 0)) {
state->mlen += msglen;
new = realloc(state->M, state->mlen * sizeof(char));
if (!new) {
state->mlen -= msglen;
return -1;
}
state->M = new;
}
__builtin_memcpy(state->M + state->mptr, msg, msglen * sizeof(char));
state->mptr += msglen;
len = state->mptr;
len -= state->mptr % (size_t)(state->r >> 3);
state->mptr -= len;
libkeccak_absorption_phase(state, state->M, len);
__builtin_memmove(state->M, state->M + len, state->mptr * sizeof(char));
return 0;
}
/**
* Absorb more of the message to the Keccak sponge
* and wipe sensitive data when possible
*
* @param state The hashing state
* @param msg The partial message
* @param msglen The length of the partial message
* @return Zero on success, -1 on error
*/
int
libkeccak_update(struct libkeccak_state *restrict state, const void *restrict msg, size_t msglen)
{
size_t len;
auto unsigned char *restrict new;
if (__builtin_expect(state->mptr + msglen > state->mlen, 0)) {
state->mlen += msglen;
new = malloc(state->mlen * sizeof(char));
if (!new) {
state->mlen -= msglen;
return -1;
}
libkeccak_state_wipe_message(state);
free(state->M);
state->M = new;
}
__builtin_memcpy(state->M + state->mptr, msg, msglen * sizeof(char));
state->mptr += msglen;
len = state->mptr;
len -= state->mptr % (size_t)(state->r >> 3);
state->mptr -= len;
libkeccak_absorption_phase(state, state->M, len);
__builtin_memmove(state->M, state->M + len, state->mptr * sizeof(char));
return 0;
}
/**
* Absorb the last part of the message and squeeze the Keccak sponge
* without copying the data to an internal buffer
*
* It is safe run zero-copy functions before non-zero-copy
* functions for the same state, running zero-copy functions
* after non-zero-copy functions on the other hand can
* cause the message to be misread
*
* @param state The hashing state
* @param msg_ The rest of the message; will be edited; extra memory
* shall be allocated such that `suffix` and a 10*1 pad (which
* is at least 2 bits long) can be added in a why the makes it's
* length a multiple of `libkeccak_zerocopy_chunksize(state)`
* @param msglen The length of the partial message
* @param bits The number of bits at the end of the message not covered by `msglen`
* @param suffix The suffix concatenate to the message, only '1':s and '0':s, and NUL-termination
* @param hashsum Output parameter for the hashsum, may be `NULL`
*/
void
libkeccak_zerocopy_digest(struct libkeccak_state *restrict state, void *restrict msg_, size_t msglen,
size_t bits, const char *restrict suffix, void *restrict hashsum)
{
unsigned char *restrict msg = msg_;
register long int rr = state->r >> 3;
auto size_t suffix_len = suffix ? __builtin_strlen(suffix) : 0;
register long int i;
if (!msg) {
msglen = 0;
bits = 0;
} else {
msglen += bits >> 3;
bits &= 7;
}
if (bits)
msg[msglen] = msg[msglen] & (unsigned char)((1 << bits) - 1);
if (__builtin_expect(!!suffix_len, 1)) {
if (!bits)
msg[msglen] = 0;
while (suffix_len--) {
msg[msglen] |= (unsigned char)((*suffix++ & 1) << bits++);
if (bits == 8) {
bits = 0;
msg[++msglen] = 0;
}
}
}
if (bits)
msglen++;
msglen = libkeccak_pad10star1((size_t)state->r, msg, msglen, bits);
libkeccak_absorption_phase(state, msg, msglen);
if (hashsum) {
libkeccak_squeezing_phase(state, rr, (state->n + 7) >> 3, state->w >> 3, hashsum);
} else {
for (i = (state->n - 1) / state->r; i--;)
libkeccak_f(state);
}
}
/**
* Absorb the last part of the message and squeeze the Keccak sponge
* without wiping sensitive data when possible
*
* @param state The hashing state
* @param msg_ The rest of the message, may be `NULL`
* @param msglen The length of the partial message
* @param bits The number of bits at the end of the message not covered by `msglen`
* @param suffix The suffix concatenate to the message, only '1':s and '0':s, and NUL-termination
* @param hashsum Output parameter for the hashsum, may be `NULL`
* @return Zero on success, -1 on error
*/
int
libkeccak_fast_digest(struct libkeccak_state *restrict state, const void *restrict msg_, size_t msglen,
size_t bits, const char *restrict suffix, void *restrict hashsum)
{
const unsigned char *restrict msg = msg_;
auto unsigned char *restrict new;
register long int rr = state->r >> 3;
auto size_t suffix_len = suffix ? __builtin_strlen(suffix) : 0;
register size_t ext;
register long int i;
if (!msg) {
msglen = 0;
bits = 0;
} else {
msglen += bits >> 3;
bits &= 7;
}
ext = msglen + ((bits + suffix_len + 7) >> 3) + (size_t)rr;
if (__builtin_expect(state->mptr + ext > state->mlen, 0)) {
state->mlen += ext;
new = realloc(state->M, state->mlen * sizeof(char));
if (!new) {
state->mlen -= ext;
return -1;
}
state->M = new;
}
if (msglen)
__builtin_memcpy(state->M + state->mptr, msg, msglen * sizeof(char));
state->mptr += msglen;
if (bits)
state->M[state->mptr] = msg[msglen] & (unsigned char)((1 << bits) - 1);
if (__builtin_expect(!!suffix_len, 1)) {
if (!bits)
state->M[state->mptr] = 0;
while (suffix_len--) {
state->M[state->mptr] |= (unsigned char)((*suffix++ & 1) << bits++);
if (bits == 8) {
bits = 0;
state->M[++(state->mptr)] = 0;
}
}
}
if (bits)
state->mptr++;
state->mptr = libkeccak_pad10star1((size_t)state->r, state->M, state->mptr, bits);
libkeccak_absorption_phase(state, state->M, state->mptr);
if (hashsum) {
libkeccak_squeezing_phase(state, rr, (state->n + 7) >> 3, state->w >> 3, hashsum);
} else {
for (i = (state->n - 1) / state->r; i--;)
libkeccak_f(state);
}
return 0;
}
/**
* Absorb the last part of the message and squeeze the Keccak sponge
* and wipe sensitive data when possible
*
* @param state The hashing state
* @param msg_ The rest of the message, may be `NULL`
* @param msglen The length of the partial message
* @param bits The number of bits at the end of the message not covered by `msglen`
* @param suffix The suffix concatenate to the message, only '1':s and '0':s, and NUL-termination
* @param hashsum Output parameter for the hashsum, may be `NULL`
* @return Zero on success, -1 on error
*/
int
libkeccak_digest(struct libkeccak_state *restrict state, const void *restrict msg_, size_t msglen,
size_t bits, const char *restrict suffix, void *restrict hashsum)
{
const unsigned char *restrict msg = msg_;
auto unsigned char *restrict new;
register long int rr = state->r >> 3;
auto size_t suffix_len = suffix ? __builtin_strlen(suffix) : 0;
register size_t ext;
register long int i;
if (!msg) {
msglen = 0;
bits = 0;
} else {
msglen += bits >> 3;
bits &= 7;
}
ext = msglen + ((bits + suffix_len + 7) >> 3) + (size_t)rr;
if (__builtin_expect(state->mptr + ext > state->mlen, 0)) {
state->mlen += ext;
new = malloc(state->mlen * sizeof(char));
if (!new) {
state->mlen -= ext;
return -1;
}
libkeccak_state_wipe_message(state);
free(state->M);
state->M = new;
}
if (msglen)
__builtin_memcpy(state->M + state->mptr, msg, msglen * sizeof(char));
state->mptr += msglen;
if (bits)
state->M[state->mptr] = msg[msglen] & (unsigned char)((1 << bits) - 1);
if (__builtin_expect(!!suffix_len, 1)) {
if (!bits)
state->M[state->mptr] = 0;
while (suffix_len--) {
state->M[state->mptr] |= (unsigned char)((*suffix++ & 1) << bits++);
if (bits == 8) {
bits = 0;
state->M[++(state->mptr)] = 0;
}
}
}
if (bits)
state->mptr++;
state->mptr = libkeccak_pad10star1((size_t)state->r, state->M, state->mptr, bits);
libkeccak_absorption_phase(state, state->M, state->mptr);
if (hashsum) {
libkeccak_squeezing_phase(state, rr, (state->n + 7) >> 3, state->w >> 3, hashsum);
} else {
for (i = (state->n - 1) / state->r; i--;)
libkeccak_f(state);
}
return 0;
}
/**
* Force some rounds of Keccak-f
*
* @param state The hashing state
* @param times The number of rounds
*/
void
libkeccak_simple_squeeze(register struct libkeccak_state *restrict state, register long int times)
{
while (times--)
libkeccak_f(state);
}
/**
* Squeeze as much as is needed to get a digest a number of times
*
* @param state The hashing state
* @param times The number of digests
*/
void
libkeccak_fast_squeeze(register struct libkeccak_state *restrict state, register long int times)
{
times *= (state->n - 1) / state->r + 1;
while (times--)
libkeccak_f(state);
}
/**
* Squeeze out another digest
*
* @param state The hashing state
* @param hashsum Output parameter for the hashsum
*/
void
libkeccak_squeeze(register struct libkeccak_state *restrict state, register void *restrict hashsum)
{
libkeccak_f(state);
libkeccak_squeezing_phase(state, state->r >> 3, (state->n + 7) >> 3, state->w >> 3, hashsum);
}
