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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/.
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//
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#ifndef SHA256_H_
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#define SHA256_H_
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#include <cstring>
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#include <string>
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#include <cstdio>
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class SHA256 {
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public:
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SHA256();
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virtual ~SHA256();
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protected:
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typedef unsigned char uint8;
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typedef unsigned int uint32;
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typedef unsigned long long uint64;
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const static uint32 sha256_k[];
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static const unsigned int SHA224_256_BLOCK_SIZE = (512/8);
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public:
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void init();
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void update(const unsigned char *message, unsigned int len);
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void final(unsigned char *digest);
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static const unsigned int DIGEST_SIZE = ( 256 / 8);
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protected:
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void transform(const unsigned char *message, unsigned int block_nb);
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unsigned int m_tot_len;
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unsigned int m_len;
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unsigned char m_block[2*SHA224_256_BLOCK_SIZE];
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uint32 m_h[8];
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};
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std::string sha256(std::string input);
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#define SHA2_SHFR(x, n) (x >> n)
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#define SHA2_ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
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#define SHA2_ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
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#define SHA2_CH(x, y, z) ((x & y) ^ (~x & z))
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#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
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#define SHA256_F1(x) (SHA2_ROTR(x, 2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
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#define SHA256_F2(x) (SHA2_ROTR(x, 6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
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#define SHA256_F3(x) (SHA2_ROTR(x, 7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x, 3))
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#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
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#define SHA2_UNPACK32(x, str) \
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{ \
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*((str) + 3) = (uint8) ((x) ); \
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*((str) + 2) = (uint8) ((x) >> 8); \
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*((str) + 1) = (uint8) ((x) >> 16); \
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*((str) + 0) = (uint8) ((x) >> 24); \
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}
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#define SHA2_PACK32(str, x) \
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{ \
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*(x) = ((uint32) *((str) + 3) ) \
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| ((uint32) *((str) + 2) << 8) \
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| ((uint32) *((str) + 1) << 16) \
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| ((uint32) *((str) + 0) << 24); \
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}
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#endif /* SHA256_H_ */
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