/* 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>

# include <openssl/opensslv.h>

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

fips_md_init_ctx(SHA224, SHA256)

{

    memset(c, 0, sizeof(*c));

    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->md_len = SHA224_DIGEST_LENGTH;

    return 1;

}

fips_md_init(SHA256)

{

    memset(c, 0, sizeof(*c));

    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->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  nn;               \

        switch ((c)->md_len)            \

        {   case SHA224_DIGEST_LENGTH:  \

                for (nn=0;nn<SHA224_DIGEST_LENGTH/4;nn++)       \

                {   ll=(c)->h[nn]; (void)HOST_l2c(ll,(s));   }  \

                break;                  \

            case SHA256_DIGEST_LENGTH:  \

                for (nn=0;nn<SHA256_DIGEST_LENGTH/4;nn++)       \

                {   ll=(c)->h[nn]; (void)HOST_l2c(ll,(s));   }  \

                break;                  \

            default:                    \

                if ((c)->md_len > SHA256_DIGEST_LENGTH) \

                    return 0;                           \

                for (nn=0;nn<(c)->md_len/4;nn++)                \

                {   ll=(c)->h[nn]; (void)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 "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 */