source: trunk/sys/libcrypto/sha256.c @ 101

/* crypto/sha/sha256.c */
/* ====================================================================
 * Copyright (c) 2004 The OpenSSL Project.  All rights reserved
 * according to the OpenSSL license [found in ../../LICENSE].
 * ====================================================================
 */
//#include <openssl/opensslconf.h>
#if !defined(OPENSSL_NO_SHA) && !defined(OPENSSL_NO_SHA256)

#include <stdlib.h>
#include <string.h>

#include <openssl/crypto.h>
#include <openssl/sha.h>
#ifdef OPENSSL_FIPS
#include <openssl/fips.h>
#endif

#include <openssl/opensslv.h>

const char SHA256_version[]="SHA-256" OPENSSL_VERSION_PTEXT;

int SHA224_Init (SHA256_CTX *c)
        {
#ifdef OPENSSL_FIPS
        FIPS_selftest_check();
#endif
        c->h[0]=0xc1059ed8UL;   c->h[1]=0x367cd507UL;
        c->h[2]=0x3070dd17UL;   c->h[3]=0xf70e5939UL;
        c->h[4]=0xffc00b31UL;   c->h[5]=0x68581511UL;
        c->h[6]=0x64f98fa7UL;   c->h[7]=0xbefa4fa4UL;
        c->Nl=0;        c->Nh=0;
        c->num=0;       c->md_len=SHA224_DIGEST_LENGTH;
        return 1;
        }

int SHA256_Init (SHA256_CTX *c)
        {
#ifdef OPENSSL_FIPS
        FIPS_selftest_check();
#endif
        c->h[0]=0x6a09e667UL;   c->h[1]=0xbb67ae85UL;
        c->h[2]=0x3c6ef372UL;   c->h[3]=0xa54ff53aUL;
        c->h[4]=0x510e527fUL;   c->h[5]=0x9b05688cUL;
        c->h[6]=0x1f83d9abUL;   c->h[7]=0x5be0cd19UL;
        c->Nl=0;        c->Nh=0;
        c->num=0;       c->md_len=SHA256_DIGEST_LENGTH;
        return 1;
        }

unsigned char *SHA224(const unsigned char *d, size_t n, unsigned char *md)
        {
        SHA256_CTX c;
        static unsigned char m[SHA224_DIGEST_LENGTH];

        if (md == NULL) md=m;
        SHA224_Init(&c);
        SHA256_Update(&c,d,n);
        SHA256_Final(md,&c);
        OPENSSL_cleanse(&c,sizeof(c));
        return(md);
        }

unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md)
        {
        SHA256_CTX c;
        static unsigned char m[SHA256_DIGEST_LENGTH];

        if (md == NULL) md=m;
        SHA256_Init(&c);
        SHA256_Update(&c,d,n);
        SHA256_Final(md,&c);
        OPENSSL_cleanse(&c,sizeof(c));
        return(md);
        }

int SHA224_Update(SHA256_CTX *c, const void *data, size_t len)
{   return SHA256_Update (c,data,len);   }
int SHA224_Final (unsigned char *md, SHA256_CTX *c)
{   return SHA256_Final (md,c);   }

#define DATA_ORDER_IS_BIG_ENDIAN

#define HASH_LONG               SHA_LONG
#define HASH_CTX                SHA256_CTX
#define HASH_CBLOCK             SHA_CBLOCK
/*
 * Note that FIPS180-2 discusses "Truncation of the Hash Function Output."
 * default: case below covers for it. It's not clear however if it's
 * permitted to truncate to amount of bytes not divisible by 4. I bet not,
 * but if it is, then default: case shall be extended. For reference.
 * Idea behind separate cases for pre-defined lenghts is to let the
 * compiler decide if it's appropriate to unroll small loops.
 */
#define HASH_MAKE_STRING(c,s)   do {    \
        unsigned long ll;               \
        unsigned int  xn;               \
        switch ((c)->md_len)            \
        {   case SHA224_DIGEST_LENGTH:  \
                for (xn=0;xn<SHA224_DIGEST_LENGTH/4;xn++)       \
                {   ll=(c)->h[xn]; HOST_l2c(ll,(s));   }        \
                break;                  \
            case SHA256_DIGEST_LENGTH:  \
                for (xn=0;xn<SHA256_DIGEST_LENGTH/4;xn++)       \
                {   ll=(c)->h[xn]; HOST_l2c(ll,(s));   }        \
                break;                  \
            default:                    \
                if ((c)->md_len > SHA256_DIGEST_LENGTH) \
                    return 0;                           \
                for (xn=0;xn<(c)->md_len/4;xn++)                \
                {   ll=(c)->h[xn]; HOST_l2c(ll,(s));   }        \
                break;                  \
        }                               \
        } while (0)

#define HASH_UPDATE             SHA256_Update
#define HASH_TRANSFORM          SHA256_Transform
#define HASH_FINAL              SHA256_Final
#define HASH_BLOCK_DATA_ORDER   sha256_block_data_order
#ifndef SHA256_ASM
static
#endif
void sha256_block_data_order (SHA256_CTX *ctx, const void *in, size_t num);

#include <openssl/md32_common.h>

#ifndef SHA256_ASM
static const SHA_LONG K256[64] = {
        0x428a2f98UL,0x71374491UL,0xb5c0fbcfUL,0xe9b5dba5UL,
        0x3956c25bUL,0x59f111f1UL,0x923f82a4UL,0xab1c5ed5UL,
        0xd807aa98UL,0x12835b01UL,0x243185beUL,0x550c7dc3UL,
        0x72be5d74UL,0x80deb1feUL,0x9bdc06a7UL,0xc19bf174UL,
        0xe49b69c1UL,0xefbe4786UL,0x0fc19dc6UL,0x240ca1ccUL,
        0x2de92c6fUL,0x4a7484aaUL,0x5cb0a9dcUL,0x76f988daUL,
        0x983e5152UL,0xa831c66dUL,0xb00327c8UL,0xbf597fc7UL,
        0xc6e00bf3UL,0xd5a79147UL,0x06ca6351UL,0x14292967UL,
        0x27b70a85UL,0x2e1b2138UL,0x4d2c6dfcUL,0x53380d13UL,
        0x650a7354UL,0x766a0abbUL,0x81c2c92eUL,0x92722c85UL,
        0xa2bfe8a1UL,0xa81a664bUL,0xc24b8b70UL,0xc76c51a3UL,
        0xd192e819UL,0xd6990624UL,0xf40e3585UL,0x106aa070UL,
        0x19a4c116UL,0x1e376c08UL,0x2748774cUL,0x34b0bcb5UL,
        0x391c0cb3UL,0x4ed8aa4aUL,0x5b9cca4fUL,0x682e6ff3UL,
        0x748f82eeUL,0x78a5636fUL,0x84c87814UL,0x8cc70208UL,
        0x90befffaUL,0xa4506cebUL,0xbef9a3f7UL,0xc67178f2UL };

/*
 * FIPS specification refers to right rotations, while our ROTATE macro
 * is left one. This is why you might notice that rotation coefficients
 * differ from those observed in FIPS document by 32-N...
 */
#define Sigma0(x)       (ROTATE((x),30) ^ ROTATE((x),19) ^ ROTATE((x),10))
#define Sigma1(x)       (ROTATE((x),26) ^ ROTATE((x),21) ^ ROTATE((x),7))
#define sigma0(x)       (ROTATE((x),25) ^ ROTATE((x),14) ^ ((x)>>3))
#define sigma1(x)       (ROTATE((x),15) ^ ROTATE((x),13) ^ ((x)>>10))

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

#ifdef OPENSSL_SMALL_FOOTPRINT

static void sha256_block_data_order (SHA256_CTX *ctx, const void *in, size_t num)
        {
        unsigned MD32_REG_T a,b,c,d,e,f,g,h,s0,s1,T1,T2;
        SHA_LONG        X[16],l;
        int i;
        const unsigned char *data=in;

                        while (num--) {

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

        for (i=0;i<16;i++)
                {
                HOST_c2l(data,l); T1 = X[i] = l;
                T1 += h + Sigma1(e) + Ch(e,f,g) + K256[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;
                }

        for (;i<64;i++)
                {
                s0 = X[(i+1)&0x0f];     s0 = sigma0(s0);
                s1 = X[(i+14)&0x0f];    s1 = sigma1(s1);

                T1 = X[i&0xf] += s0 + s1 + X[(i+9)&0xf];
                T1 += h + Sigma1(e) + Ch(e,f,g) + K256[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;
                }

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

                        }
}

#else

#define ROUND_00_15(i,a,b,c,d,e,f,g,h)          do {    \
        T1 += h + Sigma1(e) + Ch(e,f,g) + K256[i];      \
        h = Sigma0(a) + Maj(a,b,c);                     \
        d += T1;        h += T1;                } while (0)

#define ROUND_16_63(i,a,b,c,d,e,f,g,h,X)        do {    \
        s0 = X[(i+1)&0x0f];     s0 = sigma0(s0);        \
        s1 = X[(i+14)&0x0f];    s1 = sigma1(s1);        \
        T1 = X[(i)&0x0f] += s0 + s1 + X[(i+9)&0x0f];    \
        ROUND_00_15(i,a,b,c,d,e,f,g,h);         } while (0)

static void sha256_block_data_order (SHA256_CTX *ctx, const void *in, size_t num)
        {
        unsigned MD32_REG_T a,b,c,d,e,f,g,h,s0,s1,T1;
        SHA_LONG        X[16];
        int i;
        const unsigned char *data=in;
        const union { long one; char little; } is_endian = {1};

                        while (num--) {

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

        if (!is_endian.little && sizeof(SHA_LONG)==4 && ((size_t)in%4)==0)
                {
                const SHA_LONG *W=(const SHA_LONG *)data;

                T1 = X[0] = W[0];       ROUND_00_15(0,a,b,c,d,e,f,g,h);
                T1 = X[1] = W[1];       ROUND_00_15(1,h,a,b,c,d,e,f,g);
                T1 = X[2] = W[2];       ROUND_00_15(2,g,h,a,b,c,d,e,f);
                T1 = X[3] = W[3];       ROUND_00_15(3,f,g,h,a,b,c,d,e);
                T1 = X[4] = W[4];       ROUND_00_15(4,e,f,g,h,a,b,c,d);
                T1 = X[5] = W[5];       ROUND_00_15(5,d,e,f,g,h,a,b,c);
                T1 = X[6] = W[6];       ROUND_00_15(6,c,d,e,f,g,h,a,b);
                T1 = X[7] = W[7];       ROUND_00_15(7,b,c,d,e,f,g,h,a);
                T1 = X[8] = W[8];       ROUND_00_15(8,a,b,c,d,e,f,g,h);
                T1 = X[9] = W[9];       ROUND_00_15(9,h,a,b,c,d,e,f,g);
                T1 = X[10] = W[10];     ROUND_00_15(10,g,h,a,b,c,d,e,f);
                T1 = X[11] = W[11];     ROUND_00_15(11,f,g,h,a,b,c,d,e);
                T1 = X[12] = W[12];     ROUND_00_15(12,e,f,g,h,a,b,c,d);
                T1 = X[13] = W[13];     ROUND_00_15(13,d,e,f,g,h,a,b,c);
                T1 = X[14] = W[14];     ROUND_00_15(14,c,d,e,f,g,h,a,b);
                T1 = X[15] = W[15];     ROUND_00_15(15,b,c,d,e,f,g,h,a);

                data += SHA256_CBLOCK;
                }
        else
                {
                SHA_LONG l;

                HOST_c2l(data,l); T1 = X[0] = l;  ROUND_00_15(0,a,b,c,d,e,f,g,h);
                HOST_c2l(data,l); T1 = X[1] = l;  ROUND_00_15(1,h,a,b,c,d,e,f,g);
                HOST_c2l(data,l); T1 = X[2] = l;  ROUND_00_15(2,g,h,a,b,c,d,e,f);
                HOST_c2l(data,l); T1 = X[3] = l;  ROUND_00_15(3,f,g,h,a,b,c,d,e);
                HOST_c2l(data,l); T1 = X[4] = l;  ROUND_00_15(4,e,f,g,h,a,b,c,d);
                HOST_c2l(data,l); T1 = X[5] = l;  ROUND_00_15(5,d,e,f,g,h,a,b,c);
                HOST_c2l(data,l); T1 = X[6] = l;  ROUND_00_15(6,c,d,e,f,g,h,a,b);
                HOST_c2l(data,l); T1 = X[7] = l;  ROUND_00_15(7,b,c,d,e,f,g,h,a);
                HOST_c2l(data,l); T1 = X[8] = l;  ROUND_00_15(8,a,b,c,d,e,f,g,h);
                HOST_c2l(data,l); T1 = X[9] = l;  ROUND_00_15(9,h,a,b,c,d,e,f,g);
                HOST_c2l(data,l); T1 = X[10] = l; ROUND_00_15(10,g,h,a,b,c,d,e,f);
                HOST_c2l(data,l); T1 = X[11] = l; ROUND_00_15(11,f,g,h,a,b,c,d,e);
                HOST_c2l(data,l); T1 = X[12] = l; ROUND_00_15(12,e,f,g,h,a,b,c,d);
                HOST_c2l(data,l); T1 = X[13] = l; ROUND_00_15(13,d,e,f,g,h,a,b,c);
                HOST_c2l(data,l); T1 = X[14] = l; ROUND_00_15(14,c,d,e,f,g,h,a,b);
                HOST_c2l(data,l); T1 = X[15] = l; ROUND_00_15(15,b,c,d,e,f,g,h,a);
                }

        for (i=16;i<64;i+=8)
                {
                ROUND_16_63(i+0,a,b,c,d,e,f,g,h,X);
                ROUND_16_63(i+1,h,a,b,c,d,e,f,g,X);
                ROUND_16_63(i+2,g,h,a,b,c,d,e,f,X);
                ROUND_16_63(i+3,f,g,h,a,b,c,d,e,X);
                ROUND_16_63(i+4,e,f,g,h,a,b,c,d,X);
                ROUND_16_63(i+5,d,e,f,g,h,a,b,c,X);
                ROUND_16_63(i+6,c,d,e,f,g,h,a,b,X);
                ROUND_16_63(i+7,b,c,d,e,f,g,h,a,X);
                }

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

                        }
        }

#endif
#endif /* SHA256_ASM */

#endif /* OPENSSL_NO_SHA256 */