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@@ -0,0 +1,256 @@
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+/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
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+/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
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+
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+/* sha256.c
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+ *
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+ * Copyright (C) 2006-2014 wolfSSL Inc.
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+ *
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+ * This file is part of CyaSSL.
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+ *
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+ * CyaSSL is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * CyaSSL is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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+ */
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+
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+#include "sha256.h"
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+#include "api.h"
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+
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+#define XMEMSET memset
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+#define XMEMCPY memcpy
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+
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+#ifndef rotlFixed
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+static inline word32 rotlFixed(word32 x, word32 y)
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+{
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+ return (x << y) | (x >> (sizeof(y) * 8 - y));
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+}
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+#endif /* rotlFixed */
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+
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+#ifndef rotrFixed
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+static inline word32 rotrFixed(word32 x, word32 y)
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+{
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+ return (x >> y) | (x << (sizeof(y) * 8 - y));
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+}
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+#endif /* rotrFixed */
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+
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+#ifndef min
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+static inline word32 min(word32 a, word32 b)
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+{
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+ return a > b ? b : a;
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+}
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+#endif /* min */
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+
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+static inline word32 ByteReverseWord32(word32 value)
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+{
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+ /* 6 instructions with rotate instruction, 8 without */
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+ value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
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+ return rotlFixed(value, 16U);
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+}
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+
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+static inline void ByteReverseWords(word32 *out, const word32 *in,
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+ word32 byteCount)
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+{
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+ word32 count = byteCount/(word32)sizeof(word32), i;
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+
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+ for (i = 0; i < count; i++)
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+ out[i] = ByteReverseWord32(in[i]);
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+}
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+
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+int SHA256Init(SHA256 *sha256)
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+{
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+ sha256->digest[0] = 0x6A09E667L;
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+ sha256->digest[1] = 0xBB67AE85L;
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+ sha256->digest[2] = 0x3C6EF372L;
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+ sha256->digest[3] = 0xA54FF53AL;
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+ sha256->digest[4] = 0x510E527FL;
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+ sha256->digest[5] = 0x9B05688CL;
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+ sha256->digest[6] = 0x1F83D9ABL;
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+ sha256->digest[7] = 0x5BE0CD19L;
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+
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+ sha256->buffLen = 0;
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+ sha256->loLen = 0;
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+ sha256->hiLen = 0;
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+
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+ return 0;
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+}
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+
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+#define XTRANSFORM(S,B) Transform((S))
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+
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+static const word32 K[64] = {
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+ 0x428A2F98L, 0x71374491L, 0xB5C0FBCFL, 0xE9B5DBA5L, 0x3956C25BL,
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+ 0x59F111F1L, 0x923F82A4L, 0xAB1C5ED5L, 0xD807AA98L, 0x12835B01L,
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+ 0x243185BEL, 0x550C7DC3L, 0x72BE5D74L, 0x80DEB1FEL, 0x9BDC06A7L,
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+ 0xC19BF174L, 0xE49B69C1L, 0xEFBE4786L, 0x0FC19DC6L, 0x240CA1CCL,
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+ 0x2DE92C6FL, 0x4A7484AAL, 0x5CB0A9DCL, 0x76F988DAL, 0x983E5152L,
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+ 0xA831C66DL, 0xB00327C8L, 0xBF597FC7L, 0xC6E00BF3L, 0xD5A79147L,
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+ 0x06CA6351L, 0x14292967L, 0x27B70A85L, 0x2E1B2138L, 0x4D2C6DFCL,
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+ 0x53380D13L, 0x650A7354L, 0x766A0ABBL, 0x81C2C92EL, 0x92722C85L,
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+ 0xA2BFE8A1L, 0xA81A664BL, 0xC24B8B70L, 0xC76C51A3L, 0xD192E819L,
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+ 0xD6990624L, 0xF40E3585L, 0x106AA070L, 0x19A4C116L, 0x1E376C08L,
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+ 0x2748774CL, 0x34B0BCB5L, 0x391C0CB3L, 0x4ED8AA4AL, 0x5B9CCA4FL,
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+ 0x682E6FF3L, 0x748F82EEL, 0x78A5636FL, 0x84C87814L, 0x8CC70208L,
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+ 0x90BEFFFAL, 0xA4506CEBL, 0xBEF9A3F7L, 0xC67178F2L
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+};
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+
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+#define Ch(x,y,z) (z ^ (x & (y ^ z)))
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+#define Maj(x,y,z) (((x | y) & z) | (x & y))
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+#define S(x, n) rotrFixed(x, n)
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+#define R(x, n) (((x)&0xFFFFFFFFU)>>(n))
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+#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
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+#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
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+#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
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+#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
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+
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+#define RND(a,b,c,d,e,f,g,h,i) \
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+ t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
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+ t1 = Sigma0(a) + Maj(a, b, c); \
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+ d += t0; \
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+ h = t0 + t1;
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+
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+
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+static int Transform(SHA256 *sha256)
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+{
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+ word32 S[8], t0, t1;
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+ int i;
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+
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+ word32 W[64];
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+
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+ /* Copy context->state[] to working vars */
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+ for (i = 0; i < 8; i++)
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+ S[i] = sha256->digest[i];
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+
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+ for (i = 0; i < 16; i++)
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+ W[i] = sha256->buffer[i];
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+
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+ for (i = 16; i < 64; i++)
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+ W[i] = Gamma1(W[i-2]) + W[i-7] + Gamma0(W[i-15]) + W[i-16];
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+
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+ for (i = 0; i < 64; i += 8) {
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+ RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i+0);
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+ RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],i+1);
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+ RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],i+2);
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+ RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],i+3);
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+ RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],i+4);
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+ RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],i+5);
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+ RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],i+6);
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+ RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],i+7);
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+ }
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+
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+ /* Add the working vars back into digest state[] */
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+ for (i = 0; i < 8; i++) {
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+ sha256->digest[i] += S[i];
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+ }
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+
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+ return 0;
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+}
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+
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+static inline void AddLength(SHA256 *sha256, word32 len)
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+{
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+ word32 tmp = sha256->loLen;
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+ if ( (sha256->loLen += len) < tmp)
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+ sha256->hiLen++; /* carry low to high */
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+}
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+
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+int SHA256Update(SHA256 *sha256, const byte *data, word32 len)
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+{
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+ /* do block size increments */
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+ byte *local = (byte*)sha256->buffer;
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+
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+ while (len) {
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+ word32 add = min(len, SHA256_BLOCK_SIZE - sha256->buffLen);
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+ XMEMCPY(&local[sha256->buffLen], data, add);
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+
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+ sha256->buffLen += add;
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+ data += add;
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+ len -= add;
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+
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+ if (sha256->buffLen == SHA256_BLOCK_SIZE) {
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+ int ret;
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+
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+ ByteReverseWords(sha256->buffer, sha256->buffer,
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+ SHA256_BLOCK_SIZE);
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+
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+ ret = XTRANSFORM(sha256, local);
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+ if (ret != 0)
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+ return ret;
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+
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+ AddLength(sha256, SHA256_BLOCK_SIZE);
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+ sha256->buffLen = 0;
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+int SHA256Final(SHA256 *sha256, byte *hash)
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+{
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+ byte *local = (byte*)sha256->buffer;
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+ int ret;
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+
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+ AddLength(sha256, sha256->buffLen); /* before adding pads */
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+
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+ local[sha256->buffLen++] = 0x80; /* add 1 */
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+
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+ /* pad with zeros */
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+ if (sha256->buffLen > SHA256_PAD_SIZE) {
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+ XMEMSET(&local[sha256->buffLen], 0, SHA256_BLOCK_SIZE - sha256->buffLen);
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+ sha256->buffLen += SHA256_BLOCK_SIZE - sha256->buffLen;
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+
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+ ByteReverseWords(sha256->buffer, sha256->buffer, SHA256_BLOCK_SIZE);
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+
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+ ret = XTRANSFORM(sha256, local);
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+ if (ret != 0)
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+ return ret;
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+
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+ sha256->buffLen = 0;
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+ }
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+ XMEMSET(&local[sha256->buffLen], 0, SHA256_PAD_SIZE - sha256->buffLen);
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+
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+ /* put lengths in bits */
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+ sha256->hiLen = (sha256->loLen >> (8*sizeof(sha256->loLen) - 3)) +
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+ (sha256->hiLen << 3);
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+ sha256->loLen = sha256->loLen << 3;
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+
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+ /* store lengths */
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+ ByteReverseWords(sha256->buffer, sha256->buffer, SHA256_BLOCK_SIZE);
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+ /* ! length ordering dependent on digest endian type ! */
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+ XMEMCPY(&local[SHA256_PAD_SIZE], &sha256->hiLen, sizeof(word32));
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+ XMEMCPY(&local[SHA256_PAD_SIZE + sizeof(word32)], &sha256->loLen,
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+ sizeof(word32));
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+
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+ ret = XTRANSFORM(sha256, local);
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+ if (ret != 0)
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+ return ret;
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+
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+ ByteReverseWords(sha256->digest, sha256->digest, SHA256_DIGEST_SIZE);
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+ XMEMCPY(hash, sha256->digest, SHA256_DIGEST_SIZE);
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+
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+ return SHA256Init(sha256); /* reset state */
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+}
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+
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+int SHA256Hash(const byte * data, word32 len, byte * hash)
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+{
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+ int ret = 0;
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+ SHA256 sha256;
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+
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+ if ((ret = SHA256Init(&sha256)) != 0) {
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+ printf("SHA256Init failed");
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+ }
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+ else if ((ret = SHA256Update(&sha256, data, len)) != 0) {
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+ printf("SHA256Update failed");
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+ }
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+ else if ((ret = SHA256Final(&sha256, hash)) != 0) {
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+ printf("SHA256Final failed");
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+ }
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+
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+ return ret;
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+}
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