Delete bundled copy of NSS and replace with README.

nss/lib/freebl/poly1305.c

-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/* This implementation of poly1305 is by Andrew Moon
- * (https://github.com/floodyberry/poly1305-donna) and released as public
- * domain. */
-
-#include <string.h>
-
-#include "poly1305.h"
-
-#if defined(_MSC_VER) && _MSC_VER < 1600
-#include "prtypes.h"
-typedef PRUint32 uint32_t;
-typedef PRUint64 uint64_t;
-#else
-#include <stdint.h>
-#endif
-
-#if defined(NSS_X86) || defined(NSS_X64)
-/* We can assume little-endian. */
-static uint32_t U8TO32_LE(const unsigned char *m) {
-        uint32_t r;
-        memcpy(&r, m, sizeof(r));
-        return r;
-}
-
-static void U32TO8_LE(unsigned char *m, uint32_t v) {
-        memcpy(m, &v, sizeof(v));
-}
-#else
-static uint32_t U8TO32_LE(const unsigned char *m) {
-        return (uint32_t)m[0] |
-               (uint32_t)m[1] << 8 |
-               (uint32_t)m[2] << 16 |
-               (uint32_t)m[3] << 24;
-}
-
-static void U32TO8_LE(unsigned char *m, uint32_t v) {
-        m[0] = v;
-        m[1] = v >> 8;
-        m[2] = v >> 16;
-        m[3] = v >> 24;
-}
-#endif
-
-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;
-        unsigned char buf[16];
-        unsigned int buf_used;
-        unsigned char key[16];
-};
-
-/* update 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 update(struct poly1305_state_st *state, const unsigned char *in,
-                   size_t len) {
-        uint32_t t0,t1,t2,t3;
-        uint64_t t[5];
-        uint32_t b;
-        uint64_t c;
-        size_t j;
-        unsigned char 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 Poly1305Init(poly1305_state *statep, const unsigned char key[32]) {
-        struct poly1305_state_st *state = (struct poly1305_state_st*) statep;
-        uint32_t t0,t1,t2,t3;
-
-        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;
-        memcpy(state->key, key + 16, sizeof(state->key));
-}
-
-void Poly1305Update(poly1305_state *statep, const unsigned char *in,
-                     size_t in_len) {
-        unsigned int i;
-        struct poly1305_state_st *state = (struct poly1305_state_st*) statep;
-
-        if (state->buf_used) {
-                unsigned int todo = 16 - state->buf_used;
-                if (todo > in_len)
-                        todo = 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) {
-                        update(state, state->buf, 16);
-                        state->buf_used = 0;
-                }
-        }
-
-        if (in_len >= 16) {
-                size_t todo = in_len & ~0xf;
-                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 = in_len;
-        }
-}
-
-void Poly1305Finish(poly1305_state *statep, unsigned char mac[16]) {
-        struct poly1305_state_st *state = (struct poly1305_state_st*) statep;
-        uint64_t f0,f1,f2,f3;
-        uint32_t g0,g1,g2,g3,g4;
-        uint32_t b, nb;
-
-        if (state->buf_used)
-                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], (uint32_t)f0); f1 += (f0 >> 32);
-        U32TO8_LE(&mac[ 4], (uint32_t)f1); f2 += (f1 >> 32);
-        U32TO8_LE(&mac[ 8], (uint32_t)f2); f3 += (f2 >> 32);
-        U32TO8_LE(&mac[12], (uint32_t)f3);
-}