sha512.java

SHA512 is a hash function. You can use sha512 with an asymetric method to sign a document.

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package sha512;

/**
 *
 * @author mokaddem
 */
public class sha512 {
    public static final long []K={
        
           0x428a2f98d728ae22L, 0x7137449123ef65cdL, 0xb5c0fbcfec4d3b2fL, 0xe9b5dba58189dbbcL,
           0x3956c25bf348b538L, 0x59f111f1b605d019L, 0x923f82a4af194f9bL, 0xab1c5ed5da6d8118L,
           0xd807aa98a3030242L, 0x12835b0145706fbeL, 0x243185be4ee4b28cL, 0x550c7dc3d5ffb4e2L,
           0x72be5d74f27b896fL, 0x80deb1fe3b1696b1L, 0x9bdc06a725c71235L, 0xc19bf174cf692694L,
           0xe49b69c19ef14ad2L, 0xefbe4786384f25e3L, 0x0fc19dc68b8cd5b5L, 0x240ca1cc77ac9c65L,
           0x2de92c6f592b0275L, 0x4a7484aa6ea6e483L, 0x5cb0a9dcbd41fbd4L, 0x76f988da831153b5L,
           0x983e5152ee66dfabL, 0xa831c66d2db43210L, 0xb00327c898fb213fL, 0xbf597fc7beef0ee4L,
           0xc6e00bf33da88fc2L, 0xd5a79147930aa725L, 0x06ca6351e003826fL, 0x142929670a0e6e70L,
           0x27b70a8546d22ffcL, 0x2e1b21385c26c926L, 0x4d2c6dfc5ac42aedL, 0x53380d139d95b3dfL,
           0x650a73548baf63deL, 0x766a0abb3c77b2a8L, 0x81c2c92e47edaee6L, 0x92722c851482353bL,
           0xa2bfe8a14cf10364L, 0xa81a664bbc423001L, 0xc24b8b70d0f89791L, 0xc76c51a30654be30L,
           0xd192e819d6ef5218L, 0xd69906245565a910L, 0xf40e35855771202aL, 0x106aa07032bbd1b8L,
           0x19a4c116b8d2d0c8L, 0x1e376c085141ab53L, 0x2748774cdf8eeb99L, 0x34b0bcb5e19b48a8L,
           0x391c0cb3c5c95a63L, 0x4ed8aa4ae3418acbL, 0x5b9cca4f7763e373L, 0x682e6ff3d6b2b8a3L,
           0x748f82ee5defb2fcL, 0x78a5636f43172f60L, 0x84c87814a1f0ab72L, 0x8cc702081a6439ecL,
           0x90befffa23631e28L, 0xa4506cebde82bde9L, 0xbef9a3f7b2c67915L, 0xc67178f2e372532bL,
           0xca273eceea26619cL, 0xd186b8c721c0c207L, 0xeada7dd6cde0eb1eL, 0xf57d4f7fee6ed178L,
           0x06f067aa72176fbaL, 0x0a637dc5a2c898a6L, 0x113f9804bef90daeL, 0x1b710b35131c471bL,
           0x28db77f523047d84L, 0x32caab7b40c72493L, 0x3c9ebe0a15c9bebcL, 0x431d67c49c100d4cL,
           0x4cc5d4becb3e42b6L, 0x597f299cfc657e2aL, 0x5fcb6fab3ad6faecL, 0x6c44198c4a475817L,
         
    };
    
    public static long[] sha_512(long []sha,long[] in){
        
        long a=sha[0];
        long b=sha[1];
        long c=sha[2];
        long d=sha[3];
        long e=sha[4];
        long f=sha[5];
        long g=sha[6];
        long h=sha[7];
        long T1,T2;
        long W[]=sha512_sch(in);
        for (int i=0;i<80;i++){
            T1=h+SIGMA1(e)+Ch(e,f,g)+K[i]+W[i];
            T2=SIGMA0(a)+Maj(a,b,c);
            h=g;
            g=f;
            f=e;
            e=d+T1;
            d=c;
            c=b;
            b=a;
            a=T1+T2;
            
            
       } 
    return new long []{ sha[0]+a, sha[1]+b, sha[2]+c, sha[3]+d, sha[4]+e, sha[5]+f, 
       sha[6]+g, sha[7]+h };
        
    }    
  
    private static long SIGMA1(long x){
       long zz=S(14,x)^S(18,x)^S(41,x);
        return zz;
    }
    
    private static long S(int n,long x){
       long xx=(long)((x>>>n)|(x<<(64-n)));
       return xx;
    }
    private static long Ch(long x,long y,long z){
       long tt=(long)((x&y)^(~x&z));
       return tt ;
    }
    
    public static long SIGMA0 (long x){
       long ss= S(28,x)^S(34,x)^S(39,x);
       return ss;
    }
    
    public static long Maj(long x,long y,long z){
       long rr=(x&y)^(x&z)^(y&z) ;  
       return rr;  
    }
    
    public static long [] sha512_sch(long []in){
        long [] W=new long[80];
        for(int i=0;i<16;i++){W[i]=in[i];
       
        }
        for(int i=16;i<80;i++){W[i]=sigma1(W[i-2])+W[i-7]+sigma0(W[i-15])+W[i-16];
          
        }
       return W ;
    }
    
    public static long sigma0(long x){
        return (long)(S(1,x)^S(8,x)^R(7,x));   
    }
     
    public static long sigma1(long x){
        return (long)(S(19,x)^S(61,x)^R(6,x));   
    }

    public static long R (int n,long x){
        return (long)(x>>>n);
    }
    


}