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courier  0.68.2
Defines | Functions | Variables
sha256.c File Reference
#include "sha1.h"
#include <string.h>
#include <stdlib.h>

Go to the source code of this file.

Defines

#define SHA1_INTERNAL
#define ROTR(x, n)   ((SHA256_WORD)(((SHA256_WORD)(x) >> (n))|((x) << (32-(n)))))
#define ROTL(x, n)   ((SHA256_WORD)(((SHA256_WORD)(x) << (n))|((x) >> (32-(n)))))
#define CH(x, y, z)   ((SHA256_WORD)(((x) & (y)) ^ ((~(x))&(z))))
#define MAJ(x, y, z)   ((SHA256_WORD)(((x)&(y))^((x)&(z))^((y)&(z))))
#define SUM0(x)   ((SHA256_WORD)(ROTR((x),2)^ROTR((x),13)^ROTR((x),22)))
#define SUM1(x)   ((SHA256_WORD)(ROTR((x),6)^ROTR((x),11)^ROTR((x),25)))
#define TH0(x)   ((SHA256_WORD)(ROTR((x),7)^ROTR((x),18)^((SHA256_WORD)(x)>>3)))
#define TH1(x)   ((SHA256_WORD)(ROTR((x),17)^ROTR((x),19)^((SHA256_WORD)(x)>>10)))

Functions

void sha256_context_init (struct SHA256_CONTEXT *c)
void sha256_context_hash (struct SHA256_CONTEXT *cc, const unsigned char blk[SHA256_BLOCK_SIZE])
void sha256_context_hashstream (struct SHA256_CONTEXT *c, const void *p, unsigned l)
void sha256_context_endstream (struct SHA256_CONTEXT *c, unsigned long l)
void sha256_context_digest (struct SHA256_CONTEXT *c, SHA256_DIGEST d)
void sha256_context_restore (struct SHA256_CONTEXT *c, const SHA256_DIGEST d)
void sha256_digest (const void *msg, unsigned len, SHA256_DIGEST d)

Variables

static const SHA256_WORD K [64]

Define Documentation

#define CH (   x,
  y,
 
)    ((SHA256_WORD)(((x) & (y)) ^ ((~(x))&(z))))

Definition at line 18 of file sha256.c.

#define MAJ (   x,
  y,
 
)    ((SHA256_WORD)(((x)&(y))^((x)&(z))^((y)&(z))))

Definition at line 19 of file sha256.c.

#define ROTL (   x,
  n 
)    ((SHA256_WORD)(((SHA256_WORD)(x) << (n))|((x) >> (32-(n)))))

Definition at line 15 of file sha256.c.

#define ROTR (   x,
  n 
)    ((SHA256_WORD)(((SHA256_WORD)(x) >> (n))|((x) << (32-(n)))))

Definition at line 13 of file sha256.c.

#define SHA1_INTERNAL

Definition at line 6 of file sha256.c.

#define SUM0 (   x)    ((SHA256_WORD)(ROTR((x),2)^ROTR((x),13)^ROTR((x),22)))

Definition at line 21 of file sha256.c.

#define SUM1 (   x)    ((SHA256_WORD)(ROTR((x),6)^ROTR((x),11)^ROTR((x),25)))

Definition at line 22 of file sha256.c.

#define TH0 (   x)    ((SHA256_WORD)(ROTR((x),7)^ROTR((x),18)^((SHA256_WORD)(x)>>3)))

Definition at line 24 of file sha256.c.

#define TH1 (   x)    ((SHA256_WORD)(ROTR((x),17)^ROTR((x),19)^((SHA256_WORD)(x)>>10)))

Definition at line 25 of file sha256.c.


Function Documentation

void sha256_context_digest ( struct SHA256_CONTEXT *  c,
SHA256_DIGEST  d 
)

Definition at line 164 of file sha256.c.

{
       unsigned char *dp=d + SHA256_DIGEST_SIZE;
       unsigned i;

       for ( i=8; i; )
       {
              SHA256_WORD   w=c->H[--i];

              *--dp=w; w >>= 8;
              *--dp=w; w >>= 8;
              *--dp=w; w >>= 8;
              *--dp=w;
       }
}

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void sha256_context_endstream ( struct SHA256_CONTEXT *  c,
unsigned long  l 
)

Definition at line 135 of file sha256.c.

{
       unsigned char buf[8];
       static const unsigned char zero[SHA256_BLOCK_SIZE-8];

       buf[0]=0x80;
       sha256_context_hashstream(c, &buf, 1);
       while (c->blk_ptr != SHA256_BLOCK_SIZE-8)
       {
              if (c->blk_ptr > SHA256_BLOCK_SIZE-8)
              {
                     sha256_context_hashstream(c, zero,
                            SHA256_BLOCK_SIZE - c->blk_ptr);
                     continue;
              }
              sha256_context_hashstream(c, zero,
                     SHA256_BLOCK_SIZE-8-c->blk_ptr);
       }

       l *= 8;
       buf[7] = l;
       buf[6] = (l >>= 8);
       buf[5] = (l >>= 8);
       buf[4] = (l >> 8);
       buf[3]=buf[2]=buf[1]=buf[0]=0;

       sha256_context_hashstream(c, buf, 8);
}

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void sha256_context_hash ( struct SHA256_CONTEXT *  cc,
const unsigned char  blk[SHA256_BLOCK_SIZE] 
)

Definition at line 53 of file sha256.c.

{
       SHA256_WORD W[64];
       unsigned i, t;
       SHA256_WORD a,b,c,d,e,f,g,h;

       for (i=t=0; t<16; t++)
       {
              SHA256_WORD x=blk[i]; i++;

              x=(x << 8) | blk[i]; i++;
              x=(x << 8) | blk[i]; i++;
              W[t]=(x << 8) | blk[i]; i++;
       }

       for (t=16; t<64; t++)
              W[t]= TH1(W[t-2]) + W[t-7] + TH0(W[t-15]) + W[t-16];

       a=cc->H[0];
       b=cc->H[1];
       c=cc->H[2];
       d=cc->H[3];
       e=cc->H[4];
       f=cc->H[5];
       g=cc->H[6];
       h=cc->H[7];

       for (t=0; t<64; t++)
       {
              SHA256_WORD T1=h + SUM1(e) + CH(e,f,g) + K[t] + W[t];
              SHA256_WORD T2=SUM0(a)+MAJ(a,b,c);
              h=g;
              g=f;
              f=e;
              e=d+T1;
              d=c;
              c=b;
              b=a;
              a=T1+T2;
       }

       cc->H[0] += a;
       cc->H[1] += b;
       cc->H[2] += c;
       cc->H[3] += d;
       cc->H[4] += e;
       cc->H[5] += f;
       cc->H[6] += g;
       cc->H[7] += h;
}

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void sha256_context_hashstream ( struct SHA256_CONTEXT *  c,
const void *  p,
unsigned  l 
)

Definition at line 105 of file sha256.c.

{
const unsigned char *cp=(const unsigned char *)p;
unsigned ll;

       while (l)
       {
              if (c->blk_ptr == 0 && l >= SHA256_BLOCK_SIZE)
              {
                     sha256_context_hash(c, cp);
                     cp += SHA256_BLOCK_SIZE;
                     l -= SHA256_BLOCK_SIZE;
                     continue;
              }

              ll=l;
              if (ll > SHA256_BLOCK_SIZE - c->blk_ptr)
                     ll=SHA256_BLOCK_SIZE - c->blk_ptr;
              memcpy(c->blk + c->blk_ptr, cp, ll);
              c->blk_ptr += ll;
              cp += ll;
              l -= ll;
              if (c->blk_ptr >= SHA256_BLOCK_SIZE)
              {
                     sha256_context_hash(c, c->blk);
                     c->blk_ptr=0;
              }
       }
}

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void sha256_context_init ( struct SHA256_CONTEXT *  c)

Definition at line 37 of file sha256.c.

{
       if (sizeof(SHA256_WORD) != 4)
              abort();

       c->H[0] = 0x6A09E667;
       c->H[1] = 0xBB67AE85;
       c->H[2] = 0x3C6EF372;
       c->H[3] = 0xA54FF53A;
       c->H[4] = 0x510E527F;
       c->H[5] = 0x9B05688C;
       c->H[6] = 0x1F83D9AB;
       c->H[7] = 0x5BE0CD19;
       c->blk_ptr=0;
}

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void sha256_context_restore ( struct SHA256_CONTEXT *  c,
const SHA256_DIGEST  d 
)

Definition at line 180 of file sha256.c.

{
       const unsigned char *dp=d;
       unsigned i;

       for (i=0; i<8; i++)
       {
              SHA256_WORD   w= *dp++;

              w=(w << 8) | *dp++;
              w=(w << 8) | *dp++;
              w=(w << 8) | *dp++;
              c->H[i]=w;
       }
       c->blk_ptr=0;
}
void sha256_digest ( const void *  msg,
unsigned  len,
SHA256_DIGEST  d 
)

Definition at line 197 of file sha256.c.

{
       struct SHA256_CONTEXT c;

       sha256_context_init( &c );
       sha256_context_hashstream(&c, msg, len);
       sha256_context_endstream(&c, len);
       sha256_context_digest( &c, d );
}

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Variable Documentation

const SHA256_WORD K[64] [static]
Initial value:
       {0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
        0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
        0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
        0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
        0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
        0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
        0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
        0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2}

Definition at line 27 of file sha256.c.