Delete bundled copy of NSS and replace with README.

nss/lib/freebl/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 "secport.h"
-#include "chacha20.h"
-
-#if defined(_MSC_VER)
-#pragma intrinsic(_lrotl)
-#define ROTL32(x, n) _lrotl(x, n)
-#else
-#define ROTL32(x, n) ((x << n) | (x >> ((8 * sizeof x) - n)))
-#endif
-
-#define ROTATE(v, c) ROTL32((v), (c))
-
-#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(x, a, b, c, d)                                            \
-    x[a] = x[a] + x[b]; x[d] = ROTATE(x[d] ^ x[a], 16);                        \
-    x[c] = x[c] + x[d]; x[b] = ROTATE(x[b] ^ x[c], 12);                        \
-    x[a] = x[a] + x[b]; x[d] = ROTATE(x[d] ^ x[a],  8);                        \
-    x[c] = x[c] + x[d]; x[b] = ROTATE(x[b] ^ x[c],  7);
-
-static void
-ChaChaCore(unsigned char output[64], const PRUint32 input[16], int num_rounds)
-{
-    PRUint32 x[16];
-    int i;
-
-    PORT_Memcpy(x, input, sizeof(PRUint32) * 16);
-    for (i = num_rounds; i > 0; i -= 2) {
-        QUARTERROUND(x, 0, 4, 8, 12)
-        QUARTERROUND(x, 1, 5, 9, 13)
-        QUARTERROUND(x, 2, 6, 10, 14)
-        QUARTERROUND(x, 3, 7, 11, 15)
-        QUARTERROUND(x, 0, 5, 10, 15)
-        QUARTERROUND(x, 1, 6, 11, 12)
-        QUARTERROUND(x, 2, 7, 8, 13)
-        QUARTERROUND(x, 3, 4, 9, 14)
-    }
-
-    for (i = 0; i < 16; ++i) {
-        x[i] = 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[12],
-            uint32_t counter)
-{
-    unsigned char block[64];
-    PRUint32 input[16];
-    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] = counter;
-    input[13] = U8TO32_LITTLE(nonce + 0);
-    input[14] = U8TO32_LITTLE(nonce + 4);
-    input[15] = U8TO32_LITTLE(nonce + 8);
-
-    while (inLen >= 64) {
-        ChaChaCore(block, input, 20);
-        for (i = 0; i < 64; i++) {
-            out[i] = in[i] ^ block[i];
-        }
-
-        input[12]++;
-        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];
-        }
-    }
-}