Index: nss/lib/freebl/chacha20/chacha20.c |
=================================================================== |
--- nss/lib/freebl/chacha20/chacha20.c (revision 0) |
+++ nss/lib/freebl/chacha20/chacha20.c (revision 0) |
@@ -0,0 +1,108 @@ |
+/* 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 <prtypes.h> |
+#include <string.h> |
+ |
+#include <stdio.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 PLUSONE(v) (PLUS((v), 1)) |
+ |
+#define U32TO8_LITTLE(p, v) \ |
+ { (p)[0] = (v >> 0) & 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 = 20; 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, size_t inLen, |
+ const unsigned char key[32], const unsigned char nonce[8], |
+ size_t counter) { |
+ unsigned char block[64]; |
+ PRUint32 input[16]; |
+ unsigned int u; |
+ size_t 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] = counter >> 32; |
+ input[14] = U8TO32_LITTLE(nonce); |
+ 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]; |
+ } |
+ } |
+} |
Property changes on: nss/lib/freebl/chacha20/chacha20.c |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |