/*
poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
and 64 bit addition
*/
#if defined(_MSC_VER)
# define POLY1305_NOINLINE __declspec(noinline)
#elif defined(__clang__) || defined(__GNUC__)
# define POLY1305_NOINLINE __attribute__((noinline))
#else
# define POLY1305_NOINLINE
#endif
#include "private/common.h"
#define poly1305_block_size 16
/* 17 + sizeof(unsigned long long) + 14*sizeof(unsigned long) */
typedef struct poly1305_state_internal_t {
unsigned long r[5];
unsigned long h[5];
unsigned long pad[4];
unsigned long long leftover;
unsigned char buffer[poly1305_block_size];
unsigned char final;
} poly1305_state_internal_t;
static void
poly1305_init(poly1305_state_internal_t *st, const unsigned char key[32])
{
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff - wiped after finalization */
st->r[0] = (LOAD32_LE(&key[0])) & 0x3ffffff;
st->r[1] = (LOAD32_LE(&key[3]) >> 2) & 0x3ffff03;
st->r[2] = (LOAD32_LE(&key[6]) >> 4) & 0x3ffc0ff;
st->r[3] = (LOAD32_LE(&key[9]) >> 6) & 0x3f03fff;
st->r[4] = (LOAD32_LE(&key[12]) >> 8) & 0x00fffff;
/* h = 0 */
st->h[0] = 0;
st->h[1] = 0;
st->h[2] = 0;
st->h[3] = 0;
st->h[4] = 0;
/* save pad for later */
st->pad[0] = LOAD32_LE(&key[16]);
st->pad[1] = LOAD32_LE(&key[20]);
st->pad[2] = LOAD32_LE(&key[24]);
st->pad[3] = LOAD32_LE(&key[28]);
st->leftover = 0;
st->final = 0;
}
static void
poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m,
unsigned long long bytes)
{
const unsigned long hibit = (st->final) ? 0UL : (1UL << 24); /* 1 << 128 */
unsigned long r0, r1, r2, r3, r4;
unsigned long s1, s2, s3, s4;
unsigned long h0, h1, h2, h3, h4;
unsigned long long d0, d1, d2, d3, d4;
unsigned long c;
r0 = st->r[0];
r1 = st->r[1];
r2 = st->r[2];
r3 = st->r[3];
r4 = st->r[4];
s1 = r1 * 5;
s2 = r2 * 5;
s3 = r3 * 5;
s4 = r4 * 5;
h0 = st->h[0];
h1 = st->h[1];
h2 = st->h[2];
h3 = st->h[3];
h4 = st->h[4];
while (bytes >= poly1305_block_size) {
/* h += m[i] */
h0 += (LOAD32_LE(m + 0)) & 0x3ffffff;
h1 += (LOAD32_LE(m + 3) >> 2) & 0x3ffffff;
h2 += (LOAD32_LE(m + 6) >> 4) & 0x3ffffff;
h3 += (LOAD32_LE(m + 9) >> 6) & 0x3ffffff;
h4 += (LOAD32_LE(m + 12) >> 8) | hibit;
/* h *= r */
d0 = ((unsigned long long) h0 * r0) + ((unsigned long long) h1 * s4) +
((unsigned long long) h2 * s3) + ((unsigned long long) h3 * s2) +
((unsigned long long) h4 * s1);
d1 = ((unsigned long long) h0 * r1) + ((unsigned long long) h1 * r0) +
((unsigned long long) h2 * s4) + ((unsigned long long) h3 * s3) +
((unsigned long long) h4 * s2);
d2 = ((unsigned long long) h0 * r2) + ((unsigned long long) h1 * r1) +
((unsigned long long) h2 * r0) + ((unsigned long long) h3 * s4) +
((unsigned long long) h4 * s3);
d3 = ((unsigned long long) h0 * r3) + ((unsigned long long) h1 * r2) +
((unsigned long long) h2 * r1) + ((unsigned long long) h3 * r0) +
((unsigned long long) h4 * s4);
d4 = ((unsigned long long) h0 * r4) + ((unsigned long long) h1 * r3) +
((unsigned long long) h2 * r2) + ((unsigned long long) h3 * r1) +
((unsigned long long) h4 * r0);
/* (partial) h %= p */
c = (unsigned long) (d0 >> 26);
h0 = (unsigned long) d0 & 0x3ffffff;
d1 += c;
c = (unsigned long) (d1 >> 26);
h1 = (unsigned long) d1 & 0x3ffffff;
d2 += c;
c = (unsigned long) (d2 >> 26);
h2 = (unsigned long) d2 & 0x3ffffff;
d3 += c;
c = (unsigned long) (d3 >> 26);
h3 = (unsigned long) d3 & 0x3ffffff;
d4 += c;
c = (unsigned long) (d4 >> 26);
h4 = (unsigned long) d4 & 0x3ffffff;
h0 += c * 5;
c = (h0 >> 26);
h0 = h0 & 0x3ffffff;
h1 += c;
m += poly1305_block_size;
bytes -= poly1305_block_size;
}
st->h[0] = h0;
st->h[1] = h1;
st->h[2] = h2;
st->h[3] = h3;
st->h[4] = h4;
}
static POLY1305_NOINLINE void
poly1305_finish(poly1305_state_internal_t *st, unsigned char mac[16])
{
unsigned long h0, h1, h2, h3, h4, c;
unsigned long g0, g1, g2, g3, g4;
unsigned long long f;
unsigned long mask;
/* process the remaining block */
if (st->leftover) {
unsigned long long i = st->leftover;
st->buffer[i++] = 1;
for (; i < poly1305_block_size; i++) {
st->buffer[i] = 0;
}
st->final = 1;
poly1305_blocks(st, st->buffer, poly1305_block_size);
}
/* fully carry h */
h0 = st->h[0];
h1 = st->h[1];
h2 = st->h[2];
h3 = st->h[3];
h4 = st->h[4];
c = h1 >> 26;
h1 = h1 & 0x3ffffff;
h2 += c;
c = h2 >> 26;
h2 = h2 & 0x3ffffff;
h3 += c;
c = h3 >> 26;
h3 = h3 & 0x3ffffff;
h4 += c;
c = h4 >> 26;
h4 = h4 & 0x3ffffff;
h0 += c * 5;
c = h0 >> 26;
h0 = h0 & 0x3ffffff;
h1 += c;
/* compute h + -p */
g0 = h0 + 5;
c = g0 >> 26;
g0 &= 0x3ffffff;
g1 = h1 + c;
c = g1 >> 26;
g1 &= 0x3ffffff;
g2 = h2 + c;
c = g2 >> 26;
g2 &= 0x3ffffff;
g3 = h3 + c;
c = g3 >> 26;
g3 &= 0x3ffffff;
g4 = h4 + c - (1UL << 26);
/* select h if h < p, or h + -p if h >= p */
mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1;
g0 &= mask;
g1 &= mask;
g2 &= mask;
g3 &= mask;
g4 &= mask;
mask = ~mask;
h0 = (h0 & mask) | g0;
h1 = (h1 & mask) | g1;
h2 = (h2 & mask) | g2;
h3 = (h3 & mask) | g3;
h4 = (h4 & mask) | g4;
/* h = h % (2^128) */
h0 = ((h0) | (h1 << 26)) & 0xffffffff;
h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff;
h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff;
h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff;
/* mac = (h + pad) % (2^128) */
f = (unsigned long long) h0 + st->pad[0];
h0 = (unsigned long) f;
f = (unsigned long long) h1 + st->pad[1] + (f >> 32);
h1 = (unsigned long) f;
f = (unsigned long long) h2 + st->pad[2] + (f >> 32);
h2 = (unsigned long) f;
f = (unsigned long long) h3 + st->pad[3] + (f >> 32);
h3 = (unsigned long) f;
STORE32_LE(mac + 0, (uint32_t) h0);
STORE32_LE(mac + 4, (uint32_t) h1);
STORE32_LE(mac + 8, (uint32_t) h2);
STORE32_LE(mac + 12, (uint32_t) h3);
/* zero out the state */
sodium_memzero((void *) st, sizeof *st);
}
