Update NSPR to 4.12 and NSS to 3.23 on iOS

nss/lib/freebl/chacha20/chacha20.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/. */
-
-/* Adopted from the public domain code in NaCl by djb. */
-
-#include <string.h>
-#include <stdio.h>
-
-#include "prtypes.h"
-#include "chacha20.h"
-
-#define ROTL32(v, n) (((v) << (n)) | ((v) >> (32 - (n))))
-#define ROTATE(v, c) ROTL32((v), (c))
-#define XOR(v, w) ((v) ^ (w))
-#define PLUS(x, y) ((x) + (y))
-
-#define U32TO8_LITTLE(p, v) \
-        { (p)[0] = ((v)      ) & 0xff; (p)[1] = ((v) >>  8) & 0xff; \
-          (p)[2] = ((v) >> 16) & 0xff; (p)[3] = ((v) >> 24) & 0xff; }
-#define U8TO32_LITTLE(p)   \
-        (((PRUint32)((p)[0])      ) | ((PRUint32)((p)[1]) <<  8) | \
-         ((PRUint32)((p)[2]) << 16) | ((PRUint32)((p)[3]) << 24)   )
-
-#define QUARTERROUND(a,b,c,d) \
-  x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]),16); \
-  x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]),12); \
-  x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]), 8); \
-  x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]), 7);
-
-static void ChaChaCore(unsigned char output[64], const PRUint32 input[16],
-                       int num_rounds) {
-    PRUint32 x[16];
-    int i;
-
-    memcpy(x, input, sizeof(PRUint32) * 16);
-    for (i = num_rounds; i > 0; i -= 2) {
-        QUARTERROUND( 0, 4, 8,12)
-        QUARTERROUND( 1, 5, 9,13)
-        QUARTERROUND( 2, 6,10,14)
-        QUARTERROUND( 3, 7,11,15)
-        QUARTERROUND( 0, 5,10,15)
-        QUARTERROUND( 1, 6,11,12)
-        QUARTERROUND( 2, 7, 8,13)
-        QUARTERROUND( 3, 4, 9,14)
-    }
-
-    for (i = 0; i < 16; ++i) {
-        x[i] = PLUS(x[i], input[i]);
-    }
-    for (i = 0; i < 16; ++i) {
-        U32TO8_LITTLE(output + 4 * i, x[i]);
-    }
-}
-
-static const unsigned char sigma[16] = "expand 32-byte k";
-
-void ChaCha20XOR(unsigned char *out, const unsigned char *in, unsigned int inLen,
-                 const unsigned char key[32], const unsigned char nonce[8],
-                 uint64_t counter) {
-    unsigned char block[64];
-    PRUint32 input[16];
-    unsigned int u;
-    unsigned int i;
-
-    input[4] = U8TO32_LITTLE(key + 0);
-    input[5] = U8TO32_LITTLE(key + 4);
-    input[6] = U8TO32_LITTLE(key + 8);
-    input[7] = U8TO32_LITTLE(key + 12);
-
-    input[8] = U8TO32_LITTLE(key + 16);
-    input[9] = U8TO32_LITTLE(key + 20);
-    input[10] = U8TO32_LITTLE(key + 24);
-    input[11] = U8TO32_LITTLE(key + 28);
-
-    input[0] = U8TO32_LITTLE(sigma + 0);
-    input[1] = U8TO32_LITTLE(sigma + 4);
-    input[2] = U8TO32_LITTLE(sigma + 8);
-    input[3] = U8TO32_LITTLE(sigma + 12);
-
-    input[12] = (PRUint32)counter;
-    input[13] = (PRUint32)(counter >> 32);
-    input[14] = U8TO32_LITTLE(nonce + 0);
-    input[15] = U8TO32_LITTLE(nonce + 4);
-
-    while (inLen >= 64) {
-        ChaChaCore(block, input, 20);
-        for (i = 0; i < 64; i++) {
-            out[i] = in[i] ^ block[i];
-        }
-
-        input[12]++;
-        if (input[12] == 0) {
-            input[13]++;
-        }
-
-        inLen -= 64;
-        in += 64;
-        out += 64;
-    }
-
-    if (inLen > 0) {
-        ChaChaCore(block, input, 20);
-        for (i = 0; i < inLen; i++) {
-            out[i] = in[i] ^ block[i];
-        }
-    }
-}