--- a
+++ b/src/Common/SHA256.h
@@ -0,0 +1,77 @@
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see http://www.gnu.org/licenses/.
+//
+
+#ifndef SHA256_H_
+#define SHA256_H_
+
+#include <cstring>
+#include <string>
+#include <cstdio>
+
+class SHA256 {
+ public:
+ SHA256();
+ virtual ~SHA256();
+
+ protected:
+ typedef unsigned char uint8;
+ typedef unsigned int uint32;
+ typedef unsigned long long uint64;
+
+ const static uint32 sha256_k[];
+ static const unsigned int SHA224_256_BLOCK_SIZE = (512/8);
+ public:
+ void init();
+ void update(const unsigned char *message, unsigned int len);
+ void final(unsigned char *digest);
+ static const unsigned int DIGEST_SIZE = ( 256 / 8);
+
+ protected:
+ void transform(const unsigned char *message, unsigned int block_nb);
+ unsigned int m_tot_len;
+ unsigned int m_len;
+ unsigned char m_block[2*SHA224_256_BLOCK_SIZE];
+ uint32 m_h[8];
+
+};
+
+
+std::string sha256(std::string input);
+
+#define SHA2_SHFR(x, n) (x >> n)
+#define SHA2_ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
+#define SHA2_ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
+#define SHA2_CH(x, y, z) ((x & y) ^ (~x & z))
+#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+#define SHA256_F1(x) (SHA2_ROTR(x, 2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
+#define SHA256_F2(x) (SHA2_ROTR(x, 6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
+#define SHA256_F3(x) (SHA2_ROTR(x, 7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x, 3))
+#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
+#define SHA2_UNPACK32(x, str) \
+{ \
+ *((str) + 3) = (uint8) ((x) ); \
+ *((str) + 2) = (uint8) ((x) >> 8); \
+ *((str) + 1) = (uint8) ((x) >> 16); \
+ *((str) + 0) = (uint8) ((x) >> 24); \
+}
+#define SHA2_PACK32(str, x) \
+{ \
+ *(x) = ((uint32) *((str) + 3) ) \
+ | ((uint32) *((str) + 2) << 8) \
+ | ((uint32) *((str) + 1) << 16) \
+ | ((uint32) *((str) + 0) << 24); \
+}
+
+#endif /* SHA256_H_ */