sha256.h

00001 #ifndef SHA256_H
00002 #define SHA256_H
00003 #include <string>
00004  
00005 class SHA256
00006 {
00007 protected:
00008     typedef unsigned char uint8;
00009     typedef unsigned int uint32;
00010     typedef unsigned long long uint64;
00011  
00012     const static uint32 sha256_k[];
00013     static const unsigned int SHA224_256_BLOCK_SIZE = (512/8);
00014 public:
00015     void init();
00016     void update(const unsigned char *message, unsigned int len);
00017     void final(unsigned char *digest);
00018     static const unsigned int DIGEST_SIZE = ( 256 / 8);
00019  
00020 protected:
00021     void transform(const unsigned char *message, unsigned int block_nb);
00022     unsigned int m_tot_len;
00023     unsigned int m_len;
00024     unsigned char m_block[2*SHA224_256_BLOCK_SIZE];
00025     uint32 m_h[8];
00026 };
00027  
00028 std::string sha256(std::string input);
00029  
00030 #define SHA2_SHFR(x, n)    (x >> n)
00031 #define SHA2_ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
00032 #define SHA2_ROTL(x, n)   ((x << n) | (x >> ((sizeof(x) << 3) - n)))
00033 #define SHA2_CH(x, y, z)  ((x & y) ^ (~x & z))
00034 #define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
00035 #define SHA256_F1(x) (SHA2_ROTR(x,  2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
00036 #define SHA256_F2(x) (SHA2_ROTR(x,  6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
00037 #define SHA256_F3(x) (SHA2_ROTR(x,  7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x,  3))
00038 #define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
00039 #define SHA2_UNPACK32(x, str)                 \
00040 {                                             \
00041     *((str) + 3) = (uint8) ((x)      );       \
00042     *((str) + 2) = (uint8) ((x) >>  8);       \
00043     *((str) + 1) = (uint8) ((x) >> 16);       \
00044     *((str) + 0) = (uint8) ((x) >> 24);       \
00045 }
00046 #define SHA2_PACK32(str, x)                   \
00047 {                                             \
00048     *(x) =   ((uint32) *((str) + 3)      )    \
00049            | ((uint32) *((str) + 2) <<  8)    \
00050            | ((uint32) *((str) + 1) << 16)    \
00051            | ((uint32) *((str) + 0) << 24);   \
00052 }
00053 #endif