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module/crypto/zinc/poly1305/poly1305-donna32.c
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// SPDX-License-Identifier: GPL-2.0 OR MIT | |||||
/* | |||||
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. | |||||
* | |||||
* This is based in part on Andrew Moon's poly1305-donna, which is in the | |||||
* public domain. | |||||
*/ | |||||
struct poly1305_internal { | |||||
u32 h[5]; | |||||
u32 r[5]; | |||||
u32 s[4]; | |||||
}; | |||||
static void poly1305_init_generic(void *ctx, const u8 key[16]) | |||||
{ | |||||
struct poly1305_internal *st = (struct poly1305_internal *)ctx; | |||||
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ | |||||
st->r[0] = (get_unaligned_le32(&key[0])) & 0x3ffffff; | |||||
st->r[1] = (get_unaligned_le32(&key[3]) >> 2) & 0x3ffff03; | |||||
st->r[2] = (get_unaligned_le32(&key[6]) >> 4) & 0x3ffc0ff; | |||||
st->r[3] = (get_unaligned_le32(&key[9]) >> 6) & 0x3f03fff; | |||||
st->r[4] = (get_unaligned_le32(&key[12]) >> 8) & 0x00fffff; | |||||
/* s = 5*r */ | |||||
st->s[0] = st->r[1] * 5; | |||||
st->s[1] = st->r[2] * 5; | |||||
st->s[2] = st->r[3] * 5; | |||||
st->s[3] = st->r[4] * 5; | |||||
/* h = 0 */ | |||||
st->h[0] = 0; | |||||
st->h[1] = 0; | |||||
st->h[2] = 0; | |||||
st->h[3] = 0; | |||||
st->h[4] = 0; | |||||
} | |||||
static void poly1305_blocks_generic(void *ctx, const u8 *input, size_t len, | |||||
const u32 padbit) | |||||
{ | |||||
struct poly1305_internal *st = (struct poly1305_internal *)ctx; | |||||
const u32 hibit = padbit << 24; | |||||
u32 r0, r1, r2, r3, r4; | |||||
u32 s1, s2, s3, s4; | |||||
u32 h0, h1, h2, h3, h4; | |||||
u64 d0, d1, d2, d3, d4; | |||||
u32 c; | |||||
r0 = st->r[0]; | |||||
r1 = st->r[1]; | |||||
r2 = st->r[2]; | |||||
r3 = st->r[3]; | |||||
r4 = st->r[4]; | |||||
s1 = st->s[0]; | |||||
s2 = st->s[1]; | |||||
s3 = st->s[2]; | |||||
s4 = st->s[3]; | |||||
h0 = st->h[0]; | |||||
h1 = st->h[1]; | |||||
h2 = st->h[2]; | |||||
h3 = st->h[3]; | |||||
h4 = st->h[4]; | |||||
while (len >= POLY1305_BLOCK_SIZE) { | |||||
/* h += m[i] */ | |||||
h0 += (get_unaligned_le32(&input[0])) & 0x3ffffff; | |||||
h1 += (get_unaligned_le32(&input[3]) >> 2) & 0x3ffffff; | |||||
h2 += (get_unaligned_le32(&input[6]) >> 4) & 0x3ffffff; | |||||
h3 += (get_unaligned_le32(&input[9]) >> 6) & 0x3ffffff; | |||||
h4 += (get_unaligned_le32(&input[12]) >> 8) | hibit; | |||||
/* h *= r */ | |||||
d0 = ((u64)h0 * r0) + ((u64)h1 * s4) + | |||||
((u64)h2 * s3) + ((u64)h3 * s2) + | |||||
((u64)h4 * s1); | |||||
d1 = ((u64)h0 * r1) + ((u64)h1 * r0) + | |||||
((u64)h2 * s4) + ((u64)h3 * s3) + | |||||
((u64)h4 * s2); | |||||
d2 = ((u64)h0 * r2) + ((u64)h1 * r1) + | |||||
((u64)h2 * r0) + ((u64)h3 * s4) + | |||||
((u64)h4 * s3); | |||||
d3 = ((u64)h0 * r3) + ((u64)h1 * r2) + | |||||
((u64)h2 * r1) + ((u64)h3 * r0) + | |||||
((u64)h4 * s4); | |||||
d4 = ((u64)h0 * r4) + ((u64)h1 * r3) + | |||||
((u64)h2 * r2) + ((u64)h3 * r1) + | |||||
((u64)h4 * r0); | |||||
/* (partial) h %= p */ | |||||
c = (u32)(d0 >> 26); | |||||
h0 = (u32)d0 & 0x3ffffff; | |||||
d1 += c; | |||||
c = (u32)(d1 >> 26); | |||||
h1 = (u32)d1 & 0x3ffffff; | |||||
d2 += c; | |||||
c = (u32)(d2 >> 26); | |||||
h2 = (u32)d2 & 0x3ffffff; | |||||
d3 += c; | |||||
c = (u32)(d3 >> 26); | |||||
h3 = (u32)d3 & 0x3ffffff; | |||||
d4 += c; | |||||
c = (u32)(d4 >> 26); | |||||
h4 = (u32)d4 & 0x3ffffff; | |||||
h0 += c * 5; | |||||
c = (h0 >> 26); | |||||
h0 = h0 & 0x3ffffff; | |||||
h1 += c; | |||||
input += POLY1305_BLOCK_SIZE; | |||||
len -= POLY1305_BLOCK_SIZE; | |||||
} | |||||
st->h[0] = h0; | |||||
st->h[1] = h1; | |||||
st->h[2] = h2; | |||||
st->h[3] = h3; | |||||
st->h[4] = h4; | |||||
} | |||||
static void poly1305_emit_generic(void *ctx, u8 mac[16], const u32 nonce[4]) | |||||
{ | |||||
struct poly1305_internal *st = (struct poly1305_internal *)ctx; | |||||
u32 h0, h1, h2, h3, h4, c; | |||||
u32 g0, g1, g2, g3, g4; | |||||
u64 f; | |||||
u32 mask; | |||||
/* 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(u32) * 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 + nonce) % (2^128) */ | |||||
f = (u64)h0 + nonce[0]; | |||||
h0 = (u32)f; | |||||
f = (u64)h1 + nonce[1] + (f >> 32); | |||||
h1 = (u32)f; | |||||
f = (u64)h2 + nonce[2] + (f >> 32); | |||||
h2 = (u32)f; | |||||
f = (u64)h3 + nonce[3] + (f >> 32); | |||||
h3 = (u32)f; | |||||
put_unaligned_le32(h0, &mac[0]); | |||||
put_unaligned_le32(h1, &mac[4]); | |||||
put_unaligned_le32(h2, &mac[8]); | |||||
put_unaligned_le32(h3, &mac[12]); | |||||
} |