sha2.c

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    li_64(983e5152ee66dfab), li_64(a831c66d2db43210),
    li_64(b00327c898fb213f), li_64(bf597fc7beef0ee4),
    li_64(c6e00bf33da88fc2), li_64(d5a79147930aa725),
    li_64(06ca6351e003826f), li_64(142929670a0e6e70),
    li_64(27b70a8546d22ffc), li_64(2e1b21385c26c926),
    li_64(4d2c6dfc5ac42aed), li_64(53380d139d95b3df),
    li_64(650a73548baf63de), li_64(766a0abb3c77b2a8),
    li_64(81c2c92e47edaee6), li_64(92722c851482353b),
    li_64(a2bfe8a14cf10364), li_64(a81a664bbc423001),
    li_64(c24b8b70d0f89791), li_64(c76c51a30654be30),
    li_64(d192e819d6ef5218), li_64(d69906245565a910),
    li_64(f40e35855771202a), li_64(106aa07032bbd1b8),
    li_64(19a4c116b8d2d0c8), li_64(1e376c085141ab53),
    li_64(2748774cdf8eeb99), li_64(34b0bcb5e19b48a8),
    li_64(391c0cb3c5c95a63), li_64(4ed8aa4ae3418acb),
    li_64(5b9cca4f7763e373), li_64(682e6ff3d6b2b8a3),
    li_64(748f82ee5defb2fc), li_64(78a5636f43172f60),
    li_64(84c87814a1f0ab72), li_64(8cc702081a6439ec),
    li_64(90befffa23631e28), li_64(a4506cebde82bde9),
    li_64(bef9a3f7b2c67915), li_64(c67178f2e372532b),
    li_64(ca273eceea26619c), li_64(d186b8c721c0c207),
    li_64(eada7dd6cde0eb1e), li_64(f57d4f7fee6ed178),
    li_64(06f067aa72176fba), li_64(0a637dc5a2c898a6),
    li_64(113f9804bef90dae), li_64(1b710b35131c471b),
    li_64(28db77f523047d84), li_64(32caab7b40c72493),
    li_64(3c9ebe0a15c9bebc), li_64(431d67c49c100d4c),
    li_64(4cc5d4becb3e42b6), li_64(597f299cfc657e2a),
    li_64(5fcb6fab3ad6faec), li_64(6c44198c4a475817)
};

/* Compile 128 bytes of hash data into SHA384/512 digest    */
/* NOTE: this routine assumes that the byte order in the    */
/* ctx->wbuf[] at this point is such that low address bytes */
/* in the ORIGINAL byte stream will go into the high end of */
/* words on BOTH big and little endian systems              */

sha2_void sha512_compile(sha512_ctx ctx[1])
{   sha2_64t    v[8], *p = ctx->wbuf;
    sha2_32t    j;

    memcpy(v, ctx->hash, 8 * sizeof(sha2_64t));

    for(j = 0; j < 80; j += 16)
    {
        v_cycle( 0, j); v_cycle( 1, j);
        v_cycle( 2, j); v_cycle( 3, j);
        v_cycle( 4, j); v_cycle( 5, j);
        v_cycle( 6, j); v_cycle( 7, j);
        v_cycle( 8, j); v_cycle( 9, j);
        v_cycle(10, j); v_cycle(11, j);
        v_cycle(12, j); v_cycle(13, j);
        v_cycle(14, j); v_cycle(15, j);
    }

    ctx->hash[0] += v[0]; ctx->hash[1] += v[1];
    ctx->hash[2] += v[2]; ctx->hash[3] += v[3];
    ctx->hash[4] += v[4]; ctx->hash[5] += v[5];
    ctx->hash[6] += v[6]; ctx->hash[7] += v[7];
}

/* Compile 128 bytes of hash data into SHA256 digest value  */
/* NOTE: this routine assumes that the byte order in the    */
/* ctx->wbuf[] at this point is in such an order that low   */
/* address bytes in the ORIGINAL byte stream placed in this */
/* buffer will now go to the high end of words on BOTH big  */
/* and little endian systems                                */

sha2_void sha512_hash(const unsigned char data[], unsigned long len, sha512_ctx ctx[1])
{   sha2_32t pos = (sha2_32t)(ctx->count[0] & SHA512_MASK),
             space = SHA512_BLOCK_SIZE - pos;
    const unsigned char *sp = data;

    if((ctx->count[0] += len) < len)
        ++(ctx->count[1]);

    while(len >= space)     /* tranfer whole blocks while possible  */
    {
        memcpy(((unsigned char*)ctx->wbuf) + pos, sp, space);
        sp += space; len -= space; space = SHA512_BLOCK_SIZE; pos = 0;
        bsw_64(ctx->wbuf, SHA512_BLOCK_SIZE >> 3);
        sha512_compile(ctx);
    }

    memcpy(((unsigned char*)ctx->wbuf) + pos, sp, len);
}

/* SHA384/512 Final padding and digest calculation  */

static void sha_end2(unsigned char hval[], sha512_ctx ctx[1], const unsigned int hlen)
{   sha2_32t    i = (sha2_32t)(ctx->count[0] & SHA512_MASK);

    /* put bytes in the buffer in an order in which references to   */
    /* 32-bit words will put bytes with lower addresses into the    */
    /* top of 32 bit words on BOTH big and little endian machines   */
    bsw_64(ctx->wbuf, (i + 7) >> 3);

    /* we now need to mask valid bytes and add the padding which is */
    /* a single 1 bit and as many zero bits as necessary. Note that */
    /* we can always add the first padding byte here because the    */
    /* buffer always has at least one empty slot                    */
    ctx->wbuf[i >> 3] &= li_64(ffffffffffffff00) << 8 * (~i & 7);
    ctx->wbuf[i >> 3] |= li_64(0000000000000080) << 8 * (~i & 7);

    /* we need 17 or more empty byte positions, one for the padding */
    /* byte (above) and sixteen for the length count.  If there is  */
    /* not enough space pad and empty the buffer                    */
    if(i > SHA512_BLOCK_SIZE - 17)
    {
        if(i < 120) ctx->wbuf[15] = 0;
        sha512_compile(ctx);
        i = 0;
    }
    else
        i = (i >> 3) + 1;

    while(i < 14)
        ctx->wbuf[i++] = 0;

    /* the following 64-bit length fields are assembled in the      */
    /* wrong byte order on little endian machines but this is       */
    /* corrected later since they are only ever used as 64-bit      */
    /* word values.                                                 */
    ctx->wbuf[14] = (ctx->count[1] << 3) | (ctx->count[0] >> 61);
    ctx->wbuf[15] = ctx->count[0] << 3;
    sha512_compile(ctx);

    /* extract the hash value as bytes in case the hash buffer is   */
    /* misaligned for 32-bit words                                  */
    for(i = 0; i < hlen; ++i)
        hval[i] = (unsigned char)(ctx->hash[i >> 3] >> (8 * (~i & 7)));
}

#endif

#if defined(SHA_384)

/* SHA384 initialisation data   */

const sha2_64t  i384[80] =
{
    li_64(cbbb9d5dc1059ed8), li_64(629a292a367cd507),
    li_64(9159015a3070dd17), li_64(152fecd8f70e5939),
    li_64(67332667ffc00b31), li_64(8eb44a8768581511),
    li_64(db0c2e0d64f98fa7), li_64(47b5481dbefa4fa4)
};

sha2_void sha384_begin(sha384_ctx ctx[1])
{
    ctx->count[0] = ctx->count[1] = 0;
    memcpy(ctx->hash, i384, 8 * sizeof(sha2_64t));
}

sha2_void sha384_end(unsigned char hval[], sha384_ctx ctx[1])
{
    sha_end2(hval, ctx, SHA384_DIGEST_SIZE);
}

sha2_void sha384(unsigned char hval[], const unsigned char data[], unsigned long len)
{   sha384_ctx  cx[1];

    sha384_begin(cx);
    sha384_hash(data, len, cx);
    sha_end2(hval, cx, SHA384_DIGEST_SIZE);
}

#endif

#if defined(SHA_512)

/* SHA512 initialisation data   */

const sha2_64t  i512[80] =
{
    li_64(6a09e667f3bcc908), li_64(bb67ae8584caa73b),
    li_64(3c6ef372fe94f82b), li_64(a54ff53a5f1d36f1),
    li_64(510e527fade682d1), li_64(9b05688c2b3e6c1f),
    li_64(1f83d9abfb41bd6b), li_64(5be0cd19137e2179)
};

sha2_void sha512_begin(sha512_ctx ctx[1])
{
    ctx->count[0] = ctx->count[1] = 0;
    memcpy(ctx->hash, i512, 8 * sizeof(sha2_64t));
}

sha2_void sha512_end(unsigned char hval[], sha512_ctx ctx[1])
{
    sha_end2(hval, ctx, SHA512_DIGEST_SIZE);
}

sha2_void sha512(unsigned char hval[], const unsigned char data[], unsigned long len)
{   sha512_ctx  cx[1];

    sha512_begin(cx);
    sha512_hash(data, len, cx);
    sha_end2(hval, cx, SHA512_DIGEST_SIZE);
}

#endif

#if defined(SHA_2)

#define CTX_224(x)  ((x)->uu->ctx256)
#define CTX_256(x)  ((x)->uu->ctx256)
#define CTX_384(x)  ((x)->uu->ctx512)
#define CTX_512(x)  ((x)->uu->ctx512)

/* SHA2 initialisation */

sha2_int sha2_begin(unsigned long len, sha2_ctx ctx[1])
{
    switch(len)
    {
#if defined(SHA_224)
        case 224:
        case  28:   CTX_256(ctx)->count[0] = CTX_256(ctx)->count[1] = 0;
                    memcpy(CTX_256(ctx)->hash, i224, 32);
                    ctx->sha2_len = 28; return SHA2_GOOD;
#endif
#if defined(SHA_256)
        case 256:
        case  32:   CTX_256(ctx)->count[0] = CTX_256(ctx)->count[1] = 0;
                    memcpy(CTX_256(ctx)->hash, i256, 32);
                    ctx->sha2_len = 32; return SHA2_GOOD;
#endif
#if defined(SHA_384)
        case 384:
        case  48:   CTX_384(ctx)->count[0] = CTX_384(ctx)->count[1] = 0;
                    memcpy(CTX_384(ctx)->hash, i384, 64);
                    ctx->sha2_len = 48; return SHA2_GOOD;
#endif
#if defined(SHA_512)
        case 512:
        case  64:   CTX_512(ctx)->count[0] = CTX_512(ctx)->count[1] = 0;
                    memcpy(CTX_512(ctx)->hash, i512, 64);
                    ctx->sha2_len = 64; return SHA2_GOOD;
#endif
        default:    return SHA2_BAD;
    }
}

sha2_void sha2_hash(const unsigned char data[], unsigned long len, sha2_ctx ctx[1])
{
    switch(ctx->sha2_len)
    {
#if defined(SHA_224)
        case 28: sha224_hash(data, len, CTX_224(ctx)); return;
#endif
#if defined(SHA_256)
        case 32: sha256_hash(data, len, CTX_256(ctx)); return;
#endif
#if defined(SHA_384)
        case 48: sha384_hash(data, len, CTX_384(ctx)); return;
#endif
#if defined(SHA_512)
        case 64: sha512_hash(data, len, CTX_512(ctx)); return;
#endif
    }
}

sha2_void sha2_end(unsigned char hval[], sha2_ctx ctx[1])
{
    switch(ctx->sha2_len)
    {
#if defined(SHA_224)
        case 28: sha_end1(hval, CTX_224(ctx), SHA224_DIGEST_SIZE); return;
#endif
#if defined(SHA_256)
        case 32: sha_end1(hval, CTX_256(ctx), SHA256_DIGEST_SIZE); return;
#endif
#if defined(SHA_384)
        case 48: sha_end2(hval, CTX_384(ctx), SHA384_DIGEST_SIZE); return;
#endif
#if defined(SHA_512)
        case 64: sha_end2(hval, CTX_512(ctx), SHA512_DIGEST_SIZE); return;
#endif
    }
}

sha2_int sha2(unsigned char hval[], unsigned long size,
                                const unsigned char data[], unsigned long len)
{   sha2_ctx    cx[1];

    if(sha2_begin(size, cx) == SHA2_GOOD)
    {
        sha2_hash(data, len, cx); sha2_end(hval, cx); return SHA2_GOOD;
    }
    else
        return SHA2_BAD;
}

#endif

#if defined(__cplusplus)
}
#endif