#include <iostream>
#include <string>
#include <sstream>
#include <cstdlib>
using namespace std;

string sha512pad(const string &str)//sha512Ìî³ä
{
    string astr=str;
    astr+=(char)(0x80);
    
    while ((astr.size()<<3) % 1024 != 960)
    {
        astr+=(char)0;
    }
    for (int i=56;i>=0;i-=8)
    {
        astr+=(char)((str.size()<<3)>>i);
    }
    return astr;
}

unsigned long long ROTL(const unsigned long long &word,const int &num)//wordÑ­»·×óÒÆnumλ
{
    return (word<<num)|(word>>(64-num));
}

unsigned long long ROTR(const unsigned long long &word,const int &num)//wordÑ­»·ÓÒÒÆnumλ
{
    return (word>>num)|(word<<(64-num));
}

string sha512(const string &str)
{
    string strs=str;
    const unsigned long long K[80]={ 
    0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, 0x3956c25bf348b538, 
    0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242, 0x12835b0145706fbe, 
    0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 
    0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, 
    0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, 0x983e5152ee66dfab, 
    0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725, 
    0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 
    0x53380d139d95b3df, 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b, 
    0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218, 
    0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, 0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 
    0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 
    0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec, 
    0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, 0xca273eceea26619c, 
    0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba, 0x0a637dc5a2c898a6, 
    0x113f9804bef90dae, 0x1b710b35131c471b, 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 
    0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817};
    unsigned long long H[8]={0x6a09e667f3bcc908, 0xbb67ae8584caa73b, 0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1, 
    0x510e527fade682d1, 0x9b05688c2b3e6c1f, 0x1f83d9abfb41bd6b, 0x5be0cd19137e2179};
    unsigned long long W[80]={0};
    for (int i=0;i<strs.size();i+=128)
    {
        for (int j=0;j<16;j++)
        {
            W[j]=((unsigned long long)strs[i+8*j]&0xff)<<56|
                 ((unsigned long long)strs[i+8*j+1]&0xff)<<48|
                 ((unsigned long long)strs[i+8*j+2]&0xff)<<40|
                 ((unsigned long long)strs[i+8*j+3]&0xff)<<32|
                 ((unsigned long long)strs[i+8*j+4]&0xff)<<24|
                 ((unsigned long long)strs[i+8*j+5]&0xff)<<16|
                 ((unsigned long long)strs[i+8*j+6]&0xff)<<8|
                 ((unsigned long long)strs[i+8*j+7]&0xff);
        }   
        for (int t=16;t<80;t++)
        {
            unsigned long long s0=ROTR(W[t-15],1)^ROTR(W[t-15],8)^(W[t-15]>>7);
            unsigned long long s1=ROTR(W[t-2],19)^ROTR(W[t-2],61)^(W[t-2]>>6);
            W[t]=W[t-16]+s0+W[t-7]+s1;
        }
        unsigned long long a=H[0];
        unsigned long long b=H[1];
        unsigned long long c=H[2];
        unsigned long long d=H[3];
        unsigned long long e=H[4];
        unsigned long long f=H[5];
        unsigned long long g=H[6];
        unsigned long long h=H[7];
        for (int t=0;t<80;t++)
        {
            unsigned long long s0=ROTR(a,28)^ROTR(a,34)^ROTR(a,39);
            unsigned long long maj=(a&b)^(a&c)^(b&c);
            unsigned long long t2=s0+maj;
            unsigned long long s1=ROTR(e,14)^ROTR(e,18)^ROTR(e,41);
            unsigned long long ch=(e&f)^((~e)&g);
            unsigned long long t1=h+s1+ch+K[t]+W[t];
            h=g;
            g=f;
            f=e;
            e=d+t1;
            d=c;
            c=b;
            b=a;
            a=t1+t2;
        }
        H[0]+=a;
        H[1]+=b;
        H[2]+=c;
        H[3]+=d;
        H[4]+=e;
        H[5]+=f;
        H[6]+=g;
        H[7]+=h;
    }
    stringstream ss;
    ss<<hex<<H[0]<<H[1]<<H[2]<<H[3]<<H[4]<<H[5]<<H[6]<<H[7];
    ss>>strs;
    return strs;
}

int main()
{
    string str;
    cout<<"input a string:"<<endl;
    //cin>>str;
    //str="";
    for (int i=0;i<1000000;i++)
    {
        str+='a';
    }
    
    string astr=sha512pad(str);
    cout<<"SHA-512:"<<sha512(astr)<<endl;
    return 0;
}