--- /dev/null
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+// This implementation of poly1305 is by Andrew Moon
+// (https://github.com/floodyberry/poly1305-donna) and released as public
+// domain.
+
+#include <openssl/poly1305.h>
+
+#include <string.h>
+
+#include <openssl/cpu.h>
+
+#include "internal.h"
+#include "../internal.h"
+
+
+#if defined(OPENSSL_WINDOWS) || !defined(OPENSSL_X86_64)
+
+// We can assume little-endian.
+static uint32_t U8TO32_LE(const uint8_t *m) {
+ uint32_t r;
+ OPENSSL_memcpy(&r, m, sizeof(r));
+ return r;
+}
+
+static void U32TO8_LE(uint8_t *m, uint32_t v) {
+ OPENSSL_memcpy(m, &v, sizeof(v));
+}
+
+static uint64_t mul32x32_64(uint32_t a, uint32_t b) { return (uint64_t)a * b; }
+
+struct poly1305_state_st {
+ uint32_t r0, r1, r2, r3, r4;
+ uint32_t s1, s2, s3, s4;
+ uint32_t h0, h1, h2, h3, h4;
+ uint8_t buf[16];
+ unsigned int buf_used;
+ uint8_t key[16];
+};
+
+static inline struct poly1305_state_st *poly1305_aligned_state(
+ poly1305_state *state) {
+ return (struct poly1305_state_st *)(((uintptr_t)state + 63) & ~63);
+}
+
+// poly1305_blocks updates |state| given some amount of input data. This
+// function may only be called with a |len| that is not a multiple of 16 at the
+// end of the data. Otherwise the input must be buffered into 16 byte blocks.
+static void poly1305_update(struct poly1305_state_st *state, const uint8_t *in,
+ size_t len) {
+ uint32_t t0, t1, t2, t3;
+ uint64_t t[5];
+ uint32_t b;
+ uint64_t c;
+ size_t j;
+ uint8_t mp[16];
+
+ if (len < 16) {
+ goto poly1305_donna_atmost15bytes;
+ }
+
+poly1305_donna_16bytes:
+ t0 = U8TO32_LE(in);
+ t1 = U8TO32_LE(in + 4);
+ t2 = U8TO32_LE(in + 8);
+ t3 = U8TO32_LE(in + 12);
+
+ in += 16;
+ len -= 16;
+
+ state->h0 += t0 & 0x3ffffff;
+ state->h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
+ state->h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
+ state->h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
+ state->h4 += (t3 >> 8) | (1 << 24);
+
+poly1305_donna_mul:
+ t[0] = mul32x32_64(state->h0, state->r0) + mul32x32_64(state->h1, state->s4) +
+ mul32x32_64(state->h2, state->s3) + mul32x32_64(state->h3, state->s2) +
+ mul32x32_64(state->h4, state->s1);
+ t[1] = mul32x32_64(state->h0, state->r1) + mul32x32_64(state->h1, state->r0) +
+ mul32x32_64(state->h2, state->s4) + mul32x32_64(state->h3, state->s3) +
+ mul32x32_64(state->h4, state->s2);
+ t[2] = mul32x32_64(state->h0, state->r2) + mul32x32_64(state->h1, state->r1) +
+ mul32x32_64(state->h2, state->r0) + mul32x32_64(state->h3, state->s4) +
+ mul32x32_64(state->h4, state->s3);
+ t[3] = mul32x32_64(state->h0, state->r3) + mul32x32_64(state->h1, state->r2) +
+ mul32x32_64(state->h2, state->r1) + mul32x32_64(state->h3, state->r0) +
+ mul32x32_64(state->h4, state->s4);
+ t[4] = mul32x32_64(state->h0, state->r4) + mul32x32_64(state->h1, state->r3) +
+ mul32x32_64(state->h2, state->r2) + mul32x32_64(state->h3, state->r1) +
+ mul32x32_64(state->h4, state->r0);
+
+ state->h0 = (uint32_t)t[0] & 0x3ffffff;
+ c = (t[0] >> 26);
+ t[1] += c;
+ state->h1 = (uint32_t)t[1] & 0x3ffffff;
+ b = (uint32_t)(t[1] >> 26);
+ t[2] += b;
+ state->h2 = (uint32_t)t[2] & 0x3ffffff;
+ b = (uint32_t)(t[2] >> 26);
+ t[3] += b;
+ state->h3 = (uint32_t)t[3] & 0x3ffffff;
+ b = (uint32_t)(t[3] >> 26);
+ t[4] += b;
+ state->h4 = (uint32_t)t[4] & 0x3ffffff;
+ b = (uint32_t)(t[4] >> 26);
+ state->h0 += b * 5;
+
+ if (len >= 16) {
+ goto poly1305_donna_16bytes;
+ }
+
+// final bytes
+poly1305_donna_atmost15bytes:
+ if (!len) {
+ return;
+ }
+
+ for (j = 0; j < len; j++) {
+ mp[j] = in[j];
+ }
+ mp[j++] = 1;
+ for (; j < 16; j++) {
+ mp[j] = 0;
+ }
+ len = 0;
+
+ t0 = U8TO32_LE(mp + 0);
+ t1 = U8TO32_LE(mp + 4);
+ t2 = U8TO32_LE(mp + 8);
+ t3 = U8TO32_LE(mp + 12);
+
+ state->h0 += t0 & 0x3ffffff;
+ state->h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
+ state->h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
+ state->h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
+ state->h4 += (t3 >> 8);
+
+ goto poly1305_donna_mul;
+}
+
+void CRYPTO_poly1305_init(poly1305_state *statep, const uint8_t key[32]) {
+ struct poly1305_state_st *state = poly1305_aligned_state(statep);
+ uint32_t t0, t1, t2, t3;
+
+#if defined(OPENSSL_POLY1305_NEON)
+ if (CRYPTO_is_NEON_capable()) {
+ CRYPTO_poly1305_init_neon(statep, key);
+ return;
+ }
+#endif
+
+ t0 = U8TO32_LE(key + 0);
+ t1 = U8TO32_LE(key + 4);
+ t2 = U8TO32_LE(key + 8);
+ t3 = U8TO32_LE(key + 12);
+
+ // precompute multipliers
+ state->r0 = t0 & 0x3ffffff;
+ t0 >>= 26;
+ t0 |= t1 << 6;
+ state->r1 = t0 & 0x3ffff03;
+ t1 >>= 20;
+ t1 |= t2 << 12;
+ state->r2 = t1 & 0x3ffc0ff;
+ t2 >>= 14;
+ t2 |= t3 << 18;
+ state->r3 = t2 & 0x3f03fff;
+ t3 >>= 8;
+ state->r4 = t3 & 0x00fffff;
+
+ state->s1 = state->r1 * 5;
+ state->s2 = state->r2 * 5;
+ state->s3 = state->r3 * 5;
+ state->s4 = state->r4 * 5;
+
+ // init state
+ state->h0 = 0;
+ state->h1 = 0;
+ state->h2 = 0;
+ state->h3 = 0;
+ state->h4 = 0;
+
+ state->buf_used = 0;
+ OPENSSL_memcpy(state->key, key + 16, sizeof(state->key));
+}
+
+void CRYPTO_poly1305_update(poly1305_state *statep, const uint8_t *in,
+ size_t in_len) {
+ unsigned int i;
+ struct poly1305_state_st *state = poly1305_aligned_state(statep);
+
+#if defined(OPENSSL_POLY1305_NEON)
+ if (CRYPTO_is_NEON_capable()) {
+ CRYPTO_poly1305_update_neon(statep, in, in_len);
+ return;
+ }
+#endif
+
+ if (state->buf_used) {
+ unsigned todo = 16 - state->buf_used;
+ if (todo > in_len) {
+ todo = (unsigned)in_len;
+ }
+ for (i = 0; i < todo; i++) {
+ state->buf[state->buf_used + i] = in[i];
+ }
+ state->buf_used += todo;
+ in_len -= todo;
+ in += todo;
+
+ if (state->buf_used == 16) {
+ poly1305_update(state, state->buf, 16);
+ state->buf_used = 0;
+ }
+ }
+
+ if (in_len >= 16) {
+ size_t todo = in_len & ~0xf;
+ poly1305_update(state, in, todo);
+ in += todo;
+ in_len &= 0xf;
+ }
+
+ if (in_len) {
+ for (i = 0; i < in_len; i++) {
+ state->buf[i] = in[i];
+ }
+ state->buf_used = (unsigned)in_len;
+ }
+}
+
+void CRYPTO_poly1305_finish(poly1305_state *statep, uint8_t mac[16]) {
+ struct poly1305_state_st *state = poly1305_aligned_state(statep);
+ uint64_t f0, f1, f2, f3;
+ uint32_t g0, g1, g2, g3, g4;
+ uint32_t b, nb;
+
+#if defined(OPENSSL_POLY1305_NEON)
+ if (CRYPTO_is_NEON_capable()) {
+ CRYPTO_poly1305_finish_neon(statep, mac);
+ return;
+ }
+#endif
+
+ if (state->buf_used) {
+ poly1305_update(state, state->buf, state->buf_used);
+ }
+
+ b = state->h0 >> 26;
+ state->h0 = state->h0 & 0x3ffffff;
+ state->h1 += b;
+ b = state->h1 >> 26;
+ state->h1 = state->h1 & 0x3ffffff;
+ state->h2 += b;
+ b = state->h2 >> 26;
+ state->h2 = state->h2 & 0x3ffffff;
+ state->h3 += b;
+ b = state->h3 >> 26;
+ state->h3 = state->h3 & 0x3ffffff;
+ state->h4 += b;
+ b = state->h4 >> 26;
+ state->h4 = state->h4 & 0x3ffffff;
+ state->h0 += b * 5;
+
+ g0 = state->h0 + 5;
+ b = g0 >> 26;
+ g0 &= 0x3ffffff;
+ g1 = state->h1 + b;
+ b = g1 >> 26;
+ g1 &= 0x3ffffff;
+ g2 = state->h2 + b;
+ b = g2 >> 26;
+ g2 &= 0x3ffffff;
+ g3 = state->h3 + b;
+ b = g3 >> 26;
+ g3 &= 0x3ffffff;
+ g4 = state->h4 + b - (1 << 26);
+
+ b = (g4 >> 31) - 1;
+ nb = ~b;
+ state->h0 = (state->h0 & nb) | (g0 & b);
+ state->h1 = (state->h1 & nb) | (g1 & b);
+ state->h2 = (state->h2 & nb) | (g2 & b);
+ state->h3 = (state->h3 & nb) | (g3 & b);
+ state->h4 = (state->h4 & nb) | (g4 & b);
+
+ f0 = ((state->h0) | (state->h1 << 26)) + (uint64_t)U8TO32_LE(&state->key[0]);
+ f1 = ((state->h1 >> 6) | (state->h2 << 20)) +
+ (uint64_t)U8TO32_LE(&state->key[4]);
+ f2 = ((state->h2 >> 12) | (state->h3 << 14)) +
+ (uint64_t)U8TO32_LE(&state->key[8]);
+ f3 = ((state->h3 >> 18) | (state->h4 << 8)) +
+ (uint64_t)U8TO32_LE(&state->key[12]);
+
+ U32TO8_LE(&mac[0], f0);
+ f1 += (f0 >> 32);
+ U32TO8_LE(&mac[4], f1);
+ f2 += (f1 >> 32);
+ U32TO8_LE(&mac[8], f2);
+ f3 += (f2 >> 32);
+ U32TO8_LE(&mac[12], f3);
+}
+
+#endif // OPENSSL_WINDOWS || !OPENSSL_X86_64
git://repos.xcallymotion.com / motion2.git / blobdiff