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poly1305: switch to donna
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‎src/crypto/zinc/poly1305/poly1305-donna32.h‎

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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This is based in part on Andrew Moon's poly1305-donna, which is in the
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* public domain.
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*/
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struct poly1305_internal {
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u32 h[5];
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u32 r[5];
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};
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static void poly1305_init_generic(void *ctx, const u8 key[16])
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{
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struct poly1305_internal *st = (struct poly1305_internal *)ctx;
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/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
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st->r[0] = (get_unaligned_le32(&key[0])) & 0x3ffffff;
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st->r[1] = (get_unaligned_le32(&key[3]) >> 2) & 0x3ffff03;
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st->r[2] = (get_unaligned_le32(&key[6]) >> 4) & 0x3ffc0ff;
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st->r[3] = (get_unaligned_le32(&key[9]) >> 6) & 0x3f03fff;
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st->r[4] = (get_unaligned_le32(&key[12]) >> 8) & 0x00fffff;
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/* h = 0 */
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st->h[0] = 0;
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st->h[1] = 0;
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st->h[2] = 0;
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st->h[3] = 0;
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st->h[4] = 0;
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}
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static void poly1305_blocks_generic(void *ctx, const u8 *input, size_t len,
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const u32 padbit)
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{
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struct poly1305_internal *st = (struct poly1305_internal *)ctx;
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const u32 hibit = padbit ? (1UL << 24) : 0;
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u32 r0, r1, r2, r3, r4;
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u32 s1, s2, s3, s4;
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u32 h0, h1, h2, h3, h4;
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u64 d0, d1, d2, d3, d4;
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u32 c;
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r0 = st->r[0];
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r1 = st->r[1];
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r2 = st->r[2];
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r3 = st->r[3];
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r4 = st->r[4];
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s1 = r1 * 5;
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s2 = r2 * 5;
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s3 = r3 * 5;
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s4 = r4 * 5;
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h0 = st->h[0];
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h1 = st->h[1];
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h2 = st->h[2];
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h3 = st->h[3];
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h4 = st->h[4];
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while (len >= POLY1305_BLOCK_SIZE) {
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/* h += m[i] */
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h0 += (get_unaligned_le32(&input[0])) & 0x3ffffff;
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h1 += (get_unaligned_le32(&input[3]) >> 2) & 0x3ffffff;
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h2 += (get_unaligned_le32(&input[6]) >> 4) & 0x3ffffff;
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h3 += (get_unaligned_le32(&input[9]) >> 6) & 0x3ffffff;
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h4 += (get_unaligned_le32(&input[12]) >> 8) | hibit;
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/* h *= r */
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d0 = ((u64)h0 * r0) + ((u64)h1 * s4) +
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((u64)h2 * s3) + ((u64)h3 * s2) +
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((u64)h4 * s1);
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d1 = ((u64)h0 * r1) + ((u64)h1 * r0) +
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((u64)h2 * s4) + ((u64)h3 * s3) +
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((u64)h4 * s2);
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d2 = ((u64)h0 * r2) + ((u64)h1 * r1) +
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((u64)h2 * r0) + ((u64)h3 * s4) +
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((u64)h4 * s3);
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d3 = ((u64)h0 * r3) + ((u64)h1 * r2) +
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((u64)h2 * r1) + ((u64)h3 * r0) +
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((u64)h4 * s4);
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d4 = ((u64)h0 * r4) + ((u64)h1 * r3) +
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((u64)h2 * r2) + ((u64)h3 * r1) +
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((u64)h4 * r0);
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/* (partial) h %= p */
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c = (u32)(d0 >> 26);
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h0 = (u32)d0 & 0x3ffffff;
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d1 += c;
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c = (u32)(d1 >> 26);
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h1 = (u32)d1 & 0x3ffffff;
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d2 += c;
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c = (u32)(d2 >> 26);
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h2 = (u32)d2 & 0x3ffffff;
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d3 += c;
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c = (u32)(d3 >> 26);
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h3 = (u32)d3 & 0x3ffffff;
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d4 += c;
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c = (u32)(d4 >> 26);
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h4 = (u32)d4 & 0x3ffffff;
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h0 += c * 5;
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c = (h0 >> 26);
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h0 = h0 & 0x3ffffff;
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h1 += c;
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input += POLY1305_BLOCK_SIZE;
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len -= POLY1305_BLOCK_SIZE;
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}
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st->h[0] = h0;
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st->h[1] = h1;
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st->h[2] = h2;
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st->h[3] = h3;
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st->h[4] = h4;
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}
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static void poly1305_emit_generic(void *ctx, u8 mac[16], const u32 nonce[4])
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{
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struct poly1305_internal *st = (struct poly1305_internal *)ctx;
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u32 h0, h1, h2, h3, h4, c;
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u32 g0, g1, g2, g3, g4;
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u64 f;
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u32 mask;
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/* fully carry h */
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h0 = st->h[0];
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h1 = st->h[1];
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h2 = st->h[2];
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h3 = st->h[3];
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h4 = st->h[4];
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c = h1 >> 26;
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h1 = h1 & 0x3ffffff;
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h2 += c;
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c = h2 >> 26;
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h2 = h2 & 0x3ffffff;
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h3 += c;
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c = h3 >> 26;
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h3 = h3 & 0x3ffffff;
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h4 += c;
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c = h4 >> 26;
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h4 = h4 & 0x3ffffff;
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h0 += c * 5;
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c = h0 >> 26;
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h0 = h0 & 0x3ffffff;
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h1 += c;
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/* compute h + -p */
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g0 = h0 + 5;
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c = g0 >> 26;
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g0 &= 0x3ffffff;
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g1 = h1 + c;
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c = g1 >> 26;
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g1 &= 0x3ffffff;
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g2 = h2 + c;
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c = g2 >> 26;
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g2 &= 0x3ffffff;
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g3 = h3 + c;
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c = g3 >> 26;
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g3 &= 0x3ffffff;
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g4 = h4 + c - (1UL << 26);
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/* select h if h < p, or h + -p if h >= p */
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mask = (g4 >> ((sizeof(u32) * 8) - 1)) - 1;
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g0 &= mask;
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g1 &= mask;
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g2 &= mask;
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g3 &= mask;
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g4 &= mask;
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mask = ~mask;
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h0 = (h0 & mask) | g0;
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h1 = (h1 & mask) | g1;
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h2 = (h2 & mask) | g2;
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h3 = (h3 & mask) | g3;
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h4 = (h4 & mask) | g4;
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/* h = h % (2^128) */
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h0 = ((h0) | (h1 << 26)) & 0xffffffff;
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h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff;
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h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff;
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h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff;
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/* mac = (h + nonce) % (2^128) */
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f = (u64)h0 + nonce[0];
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h0 = (u32)f;
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f = (u64)h1 + nonce[1] + (f >> 32);
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h1 = (u32)f;
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f = (u64)h2 + nonce[2] + (f >> 32);
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h2 = (u32)f;
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f = (u64)h3 + nonce[3] + (f >> 32);
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h3 = (u32)f;
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put_unaligned_le32(h0, &mac[0]);
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put_unaligned_le32(h1, &mac[4]);
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put_unaligned_le32(h2, &mac[8]);
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put_unaligned_le32(h3, &mac[12]);
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}

‎src/crypto/zinc/poly1305/poly1305-donna64.h‎

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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This is based in part on Andrew Moon's poly1305-donna, which is in the
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* public domain.
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*/
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typedef __uint128_t u128;
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struct poly1305_internal {
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u64 r[3];
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u64 h[3];
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};
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static void poly1305_init_generic(void *ctx, const u8 key[16])
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{
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struct poly1305_internal *st = (struct poly1305_internal *)ctx;
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u64 t0, t1;
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/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
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t0 = get_unaligned_le64(&key[0]);
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t1 = get_unaligned_le64(&key[8]);
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/* wiped after finalization */
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st->r[0] = (t0) &0xffc0fffffff;
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st->r[1] = ((t0 >> 44) | (t1 << 20)) & 0xfffffc0ffff;
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st->r[2] = ((t1 >> 24)) & 0x00ffffffc0f;
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/* h = 0 */
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st->h[0] = 0;
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st->h[1] = 0;
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st->h[2] = 0;
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}
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static void poly1305_blocks_generic(void *ctx, const u8 *input, size_t len,
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const u32 padbit)
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{
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struct poly1305_internal *st = (struct poly1305_internal *)ctx;
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const u64 hibit = padbit ? (1ULL << 40) : 0;
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u64 r0, r1, r2;
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u64 s1, s2;
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u64 h0, h1, h2;
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u64 c;
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u128 d0, d1, d2, d;
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r0 = st->r[0];
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r1 = st->r[1];
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r2 = st->r[2];
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h0 = st->h[0];
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h1 = st->h[1];
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h2 = st->h[2];
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s1 = r1 * (5 << 2);
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s2 = r2 * (5 << 2);
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while (len >= POLY1305_BLOCK_SIZE) {
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u64 t0, t1;
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/* h += m[i] */
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t0 = get_unaligned_le64(&input[0]);
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t1 = get_unaligned_le64(&input[8]);
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h0 += ((t0) &0xfffffffffff);
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h1 += (((t0 >> 44) | (t1 << 20)) & 0xfffffffffff);
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h2 += (((t1 >> 24)) & 0x3ffffffffff) | hibit;
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/* h *= r */
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d0 = ((u128)h0 * r0);
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d = ((u128)h1 * s2);
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d0 += d;
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d = ((u128)h2 * s1);
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d0 += d;
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d1 = ((u128)h0 * r1);
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d = ((u128)h1 * r0);
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d1 += d;
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d = ((u128)h2 * s2);
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d1 += d;
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d2 = ((u128)h0 * r2);
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d = ((u128)h1 * r1);
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d2 += d;
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d = ((u128)h2 * r0);
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d2 += d;
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/* (partial) h %= p */
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c = (u64)(d0 >> 44);
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h0 = (u64)d0 & 0xfffffffffff;
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d1 += c;
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c = (u64)(d1 >> 44);
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h1 = (u64)d1 & 0xfffffffffff;
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d2 += c;
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c = (u64)(d2 >> 42);
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h2 = (u64)d2 & 0x3ffffffffff;
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h0 += c * 5;
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c = (h0 >> 44);
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h0 = h0 & 0xfffffffffff;
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h1 += c;
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input += POLY1305_BLOCK_SIZE;
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len -= POLY1305_BLOCK_SIZE;
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}
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st->h[0] = h0;
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st->h[1] = h1;
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st->h[2] = h2;
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}
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static void poly1305_emit_generic(void *ctx, u8 mac[16], const u32 nonce[4])
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{
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struct poly1305_internal *st = (struct poly1305_internal *)ctx;
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u64 h0, h1, h2, c;
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u64 g0, g1, g2;
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u64 t0, t1;
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/* fully carry h */
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h0 = st->h[0];
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h1 = st->h[1];
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h2 = st->h[2];
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c = (h1 >> 44);
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h1 &= 0xfffffffffff;
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h2 += c;
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c = (h2 >> 42);
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h2 &= 0x3ffffffffff;
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h0 += c * 5;
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c = (h0 >> 44);
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h0 &= 0xfffffffffff;
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h1 += c;
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c = (h1 >> 44);
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h1 &= 0xfffffffffff;
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h2 += c;
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c = (h2 >> 42);
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h2 &= 0x3ffffffffff;
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h0 += c * 5;
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c = (h0 >> 44);
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h0 &= 0xfffffffffff;
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h1 += c;
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/* compute h + -p */
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g0 = h0 + 5;
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c = (g0 >> 44);
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g0 &= 0xfffffffffff;
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g1 = h1 + c;
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c = (g1 >> 44);
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g1 &= 0xfffffffffff;
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g2 = h2 + c - (1ULL << 42);
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/* select h if h < p, or h + -p if h >= p */
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c = (g2 >> ((sizeof(u64) * 8) - 1)) - 1;
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g0 &= c;
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g1 &= c;
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g2 &= c;
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c = ~c;
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h0 = (h0 & c) | g0;
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h1 = (h1 & c) | g1;
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h2 = (h2 & c) | g2;
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/* h = (h + nonce) */
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t0 = ((u64)nonce[1] << 32) | nonce[0];
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t1 = ((u64)nonce[3] << 32) | nonce[2];
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h0 += ((t0) &0xfffffffffff);
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c = (h0 >> 44);
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h0 &= 0xfffffffffff;
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h1 += (((t0 >> 44) | (t1 << 20)) & 0xfffffffffff) + c;
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c = (h1 >> 44);
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h1 &= 0xfffffffffff;
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h2 += (((t1 >> 24)) & 0x3ffffffffff) + c;
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h2 &= 0x3ffffffffff;
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/* mac = h % (2^128) */
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h0 = (h0 | (h1 << 44));
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h1 = ((h1 >> 20) | (h2 << 24));
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put_unaligned_le64(h0, &mac[0]);
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put_unaligned_le64(h1, &mac[8]);
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}

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