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/*

 * Implementation of the Secure Hashing Algorithm (SHA-384 and SHA-512)

 *

 * Generates a a 384 or 512 bit message digest. It should be impossible to come

 * come up with two messages that hash to the same value ("collision free").

 *

 * For use with byte-oriented messages only. Could/Should be speeded

 * up by unwinding loops in shs_transform(), and assembly patches.

 *

 * NOTE: This requires a 64-bit integer type to be defined

 */

#include <stdio.h>

#include "miracl.h"

#ifdef mr_unsign64

#define H0 0x6a09e667f3bcc908

#define H1 0xbb67ae8584caa73b

#define H2 0x3c6ef372fe94f82b

#define H3 0xa54ff53a5f1d36f1

#define H4 0x510e527fade682d1

#define H5 0x9b05688c2b3e6c1f

#define H6 0x1f83d9abfb41bd6b

#define H7 0x5be0cd19137e2179

#define H8 0xcbbb9d5dc1059ed8

#define H9 0x629a292a367cd507

#define HA 0x9159015a3070dd17

#define HB 0x152fecd8f70e5939

#define HC 0x67332667ffc00b31

#define HD 0x8eb44a8768581511

#define HE 0xdb0c2e0d64f98fa7

#define HF 0x47b5481dbefa4fa4

static mr_unsign64 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};

#define PAD  0x80

#define ZERO 0

/* functions */

#define S(n,x) (((x)>>n) | ((x)<<(64-n)))

#define R(n,x) ((x)>>n)

#define Ch(x,y,z)  ((x&y)^(~(x)&z))

#define Maj(x,y,z) ((x&y)^(x&z)^(y&z))

#define Sig0(x)    (S(28,x)^S(34,x)^S(39,x))

#define Sig1(x)    (S(14,x)^S(18,x)^S(41,x))

#define theta0(x)  (S(1,x)^S(8,x)^R(7,x))

#define theta1(x)  (S(19,x)^S(61,x)^R(6,x))

static void shs_transform(sha512 *sh)

{ /* basic transformation step */

    mr_unsign64 a,b,c,d,e,f,g,h,t1,t2;

    int j;

    for (j=16;j<80;j++)

        sh->w[j]=theta1(sh->w[j-2])+sh->w[j-7]+theta0(sh->w[j-15])+sh->w[j-16];

    a=sh->h[0]; b=sh->h[1]; c=sh->h[2]; d=sh->h[3];

    e=sh->h[4]; f=sh->h[5]; g=sh->h[6]; h=sh->h[7];

    for (j=0;j<80;j++)

    { /* 80 times - mush it up */

        t1=h+Sig1(e)+Ch(e,f,g)+K[j]+sh->w[j];

        t2=Sig0(a)+Maj(a,b,c);

        h=g; g=f; f=e;

        e=d+t1;

        d=c;

        c=b;

        b=a;

        a=t1+t2;

    }

    sh->h[0]+=a; sh->h[1]+=b; sh->h[2]+=c; sh->h[3]+=d;

    sh->h[4]+=e; sh->h[5]+=f; sh->h[6]+=g; sh->h[7]+=h;

}

void shs512_init(sha512 *sh)

{ /* re-initialise */

    int i;

    for (i=0;i<80;i++) sh->w[i]=0;

    sh->length[0]=sh->length[1]=0;

    sh->h[0]=H0;

    sh->h[1]=H1;

    sh->h[2]=H2;

    sh->h[3]=H3;

    sh->h[4]=H4;

    sh->h[5]=H5;

    sh->h[6]=H6;

    sh->h[7]=H7;

}

void shs384_init(sha384 *sh)

{ /* re-initialise */

    int i;

    for (i=0;i<80;i++) sh->w[i]=0;

    sh->length[0]=sh->length[1]=0;

    sh->h[0]=H8;

    sh->h[1]=H9;

    sh->h[2]=HA;

    sh->h[3]=HB;

    sh->h[4]=HC;

    sh->h[5]=HD;

    sh->h[6]=HE;

    sh->h[7]=HF;

}

void shs512_process(sha512 *sh,int byte)

{ /* process the next message byte */

    int cnt;

    cnt=(int)((sh->length[0]/64)%16);

    sh->w[cnt]<<=8;

    sh->w[cnt]|=(mr_unsign64)(byte&0xFF);

    sh->length[0]+=8;

    if (sh->length[0]==0L) { sh->length[1]++; sh->length[0]=0L; }

    if ((sh->length[0]%1024)==0) shs_transform(sh);

}

void shs384_process(sha384 *sh,int byte)

{ /* process the next message byte */

    int cnt;

    cnt=(int)((sh->length[0]/64)%16);

    sh->w[cnt]<<=8;

    sh->w[cnt]|=(mr_unsign64)(byte&0xFF);

    sh->length[0]+=8;

    if (sh->length[0]==0L) { sh->length[1]++; sh->length[0]=0L; }

    if ((sh->length[0]%1024)==0) shs_transform(sh);

}

void shs512_hash(sha512 *sh,char hash[64])

{ /* pad message and finish - supply digest */

    int i;

    mr_unsign64 len0,len1;

    len0=sh->length[0];

    len1=sh->length[1];

    shs512_process(sh,PAD);

    while ((sh->length[0]%1024)!=896) shs512_process(sh,ZERO);

    sh->w[14]=len1;

    sh->w[15]=len0;

    shs_transform(sh);

    for (i=0;i<64;i++)

    { /* convert to bytes */

        hash[i]=(char)((sh->h[i/8]>>(8*(7-i%8))) & 0xffL);

    }

    shs512_init(sh);

}

void shs384_hash(sha384 *sh,char hash[48])

{ /* pad message and finish - supply digest */

    int i;

    mr_unsign64 len0,len1;

    len0=sh->length[0];

    len1=sh->length[1];

    shs512_process(sh,PAD);

    while ((sh->length[0]%1024)!=896) shs384_process(sh,ZERO);

    sh->w[14]=len1;

    sh->w[15]=len0;

    shs_transform(sh);

    for (i=0;i<48;i++)

    { /* convert to bytes */

        hash[i]=(char)((sh->h[i/8]>>(8*(7-i%8))) & 0xffL);

    }

    shs384_init(sh);

}

#endif

/* test program: should produce digests

512 bit

8e959b75dae313da 8cf4f72814fc143f 8f7779c6eb9f7fa1 7299aeadb6889018

501d289e4900f7e4 331b99dec4b5433a c7d329eeb6dd2654 5e96e55b874be909

384 bit

09330c33f71147e8 3d192fc782cd1b47 53111b173b3b05d2 2fa08086e3b0f712

fcc7c71a557e2db9 66c3e9fa91746039

#include <stdio.h>

#include "miracl.h"

char test[]="abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu";

int main()

{

    char hash[64];

    int i;

    sha512 sh;

    shs512_init(&sh);

    for (i=0;test[i]!=0;i++) shs512_process(&sh,test[i]);

    shs512_hash(&sh,hash);

    for (i=0;i<64;i++) printf("%02x",(unsigned char)hash[i]);

    printf("\n");

    shs384_init(&sh);

    for (i=0;test[i]!=0;i++) shs384_process(&sh,test[i]);

    shs384_hash(&sh,hash);

    for (i=0;i<48;i++) printf("%02x",(unsigned char)hash[i]);

    printf("\n");

    return 0;

}

*/