pana_sha1.h

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#ifndef __PANA_SHA1_H__
#define __PANA_SHA1_H__

#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN
#endif // LITTLE_ENDIAN

class PANA_Sha1
{
    public:
            PANA_Sha1();

            virtual ~PANA_Sha1();

        // Rotate x bits to the left
        #define ROL32(value, bits) (((value)<<(bits))|((value)>>(32-(bits))))

        #ifdef LITTLE_ENDIAN
                #define SHABLK0(i) (m_block->l[i] = \
                        (ROL32(m_block->l[i],24) & 0xFF00FF00) | (ROL32(m_block->l[i],8) & 0x00FF00FF))
        #else
                #define SHABLK0(i) (m_block->l[i])
        #endif

        #define SHABLK(i) (m_block->l[i&15] = ROL32(m_block->l[(i+13)&15] ^ m_block->l[(i+8)&15] \
                ^ m_block->l[(i+2)&15] ^ m_block->l[i&15],1))

        // SHA-1 rounds
        #define R0(v,w,x,y,z,i) { z+=((w&(x^y))^y)+SHABLK0(i)+0x5A827999+ROL32(v,5); w=ROL32(w,30); }
        #define R1(v,w,x,y,z,i) { z+=((w&(x^y))^y)+SHABLK(i)+0x5A827999+ROL32(v,5); w=ROL32(w,30); }
        #define R2(v,w,x,y,z,i) { z+=(w^x^y)+SHABLK(i)+0x6ED9EBA1+ROL32(v,5); w=ROL32(w,30); }
        #define R3(v,w,x,y,z,i) { z+=(((w|x)&y)|(w&x))+SHABLK(i)+0x8F1BBCDC+ROL32(v,5); w=ROL32(w,30); }
        #define R4(v,w,x,y,z,i) { z+=(w^x^y)+SHABLK(i)+0xCA62C1D6+ROL32(v,5); w=ROL32(w,30); }

        typedef union {
                unsigned char c[64];
                unsigned long l[16];
        } SHA1_WORKSPACE_BLOCK;

        // Two different formats for ReportHash(...)
        enum {
                REPORT_HEX = 0,
                REPORT_DIGIT = 1
        };

            unsigned long m_state[5];
            unsigned long m_count[2];
            unsigned char m_buffer[64];
            unsigned char m_digest[20];

            void Reset();

            void Update(unsigned char* data, unsigned int len);

            void Final();

            void ReportHash(char *report, unsigned char type = REPORT_HEX);

            void GetHash(unsigned char *uDest);

    private:
        void Transform(unsigned long state[5], unsigned char buffer[64]);

        unsigned char m_workspace[64]; 
        SHA1_WORKSPACE_BLOCK* m_block; 
};

#endif // __PANA_SHA1_H__

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