xref: /isa-l_crypto/mh_sha256/sha256_for_mh_sha256.c (revision 15f45959d342594afa975e58d4e7e8bbe34e2f0b)

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#include "mh_sha256_internal.h"
#include <string.h>

////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Reference SHA256 Functions for mh_sha256
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////

#define W(x) w[(x) & 15]

#define step(i, a, b, c, d, e, f, g, h, k)                                                         \
        if (i < 16)                                                                                \
                W(i) = to_be32(ww[i]);                                                             \
        else                                                                                       \
                W(i) = W(i - 16) + S0(W(i - 15)) + W(i - 7) + S1(W(i - 2));                        \
        t2 = s0(a) + maj(a, b, c);                                                                 \
        t1 = h + s1(e) + ch(e, f, g) + k + W(i);                                                   \
        d += t1;                                                                                   \
        h = t1 + t2;

void
sha256_single_for_mh_sha256(const uint8_t *data, uint32_t digest[])
{
        uint32_t a, b, c, d, e, f, g, h, t1, t2;
        uint32_t w[16];
        uint32_t *ww = (uint32_t *) data;

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

        step(0, a, b, c, d, e, f, g, h, 0x428a2f98);
        step(1, h, a, b, c, d, e, f, g, 0x71374491);
        step(2, g, h, a, b, c, d, e, f, 0xb5c0fbcf);
        step(3, f, g, h, a, b, c, d, e, 0xe9b5dba5);
        step(4, e, f, g, h, a, b, c, d, 0x3956c25b);
        step(5, d, e, f, g, h, a, b, c, 0x59f111f1);
        step(6, c, d, e, f, g, h, a, b, 0x923f82a4);
        step(7, b, c, d, e, f, g, h, a, 0xab1c5ed5);
        step(8, a, b, c, d, e, f, g, h, 0xd807aa98);
        step(9, h, a, b, c, d, e, f, g, 0x12835b01);
        step(10, g, h, a, b, c, d, e, f, 0x243185be);
        step(11, f, g, h, a, b, c, d, e, 0x550c7dc3);
        step(12, e, f, g, h, a, b, c, d, 0x72be5d74);
        step(13, d, e, f, g, h, a, b, c, 0x80deb1fe);
        step(14, c, d, e, f, g, h, a, b, 0x9bdc06a7);
        step(15, b, c, d, e, f, g, h, a, 0xc19bf174);
        step(16, a, b, c, d, e, f, g, h, 0xe49b69c1);
        step(17, h, a, b, c, d, e, f, g, 0xefbe4786);
        step(18, g, h, a, b, c, d, e, f, 0x0fc19dc6);
        step(19, f, g, h, a, b, c, d, e, 0x240ca1cc);
        step(20, e, f, g, h, a, b, c, d, 0x2de92c6f);
        step(21, d, e, f, g, h, a, b, c, 0x4a7484aa);
        step(22, c, d, e, f, g, h, a, b, 0x5cb0a9dc);
        step(23, b, c, d, e, f, g, h, a, 0x76f988da);
        step(24, a, b, c, d, e, f, g, h, 0x983e5152);
        step(25, h, a, b, c, d, e, f, g, 0xa831c66d);
        step(26, g, h, a, b, c, d, e, f, 0xb00327c8);
        step(27, f, g, h, a, b, c, d, e, 0xbf597fc7);
        step(28, e, f, g, h, a, b, c, d, 0xc6e00bf3);
        step(29, d, e, f, g, h, a, b, c, 0xd5a79147);
        step(30, c, d, e, f, g, h, a, b, 0x06ca6351);
        step(31, b, c, d, e, f, g, h, a, 0x14292967);
        step(32, a, b, c, d, e, f, g, h, 0x27b70a85);
        step(33, h, a, b, c, d, e, f, g, 0x2e1b2138);
        step(34, g, h, a, b, c, d, e, f, 0x4d2c6dfc);
        step(35, f, g, h, a, b, c, d, e, 0x53380d13);
        step(36, e, f, g, h, a, b, c, d, 0x650a7354);
        step(37, d, e, f, g, h, a, b, c, 0x766a0abb);
        step(38, c, d, e, f, g, h, a, b, 0x81c2c92e);
        step(39, b, c, d, e, f, g, h, a, 0x92722c85);
        step(40, a, b, c, d, e, f, g, h, 0xa2bfe8a1);
        step(41, h, a, b, c, d, e, f, g, 0xa81a664b);
        step(42, g, h, a, b, c, d, e, f, 0xc24b8b70);
        step(43, f, g, h, a, b, c, d, e, 0xc76c51a3);
        step(44, e, f, g, h, a, b, c, d, 0xd192e819);
        step(45, d, e, f, g, h, a, b, c, 0xd6990624);
        step(46, c, d, e, f, g, h, a, b, 0xf40e3585);
        step(47, b, c, d, e, f, g, h, a, 0x106aa070);
        step(48, a, b, c, d, e, f, g, h, 0x19a4c116);
        step(49, h, a, b, c, d, e, f, g, 0x1e376c08);
        step(50, g, h, a, b, c, d, e, f, 0x2748774c);
        step(51, f, g, h, a, b, c, d, e, 0x34b0bcb5);
        step(52, e, f, g, h, a, b, c, d, 0x391c0cb3);
        step(53, d, e, f, g, h, a, b, c, 0x4ed8aa4a);
        step(54, c, d, e, f, g, h, a, b, 0x5b9cca4f);
        step(55, b, c, d, e, f, g, h, a, 0x682e6ff3);
        step(56, a, b, c, d, e, f, g, h, 0x748f82ee);
        step(57, h, a, b, c, d, e, f, g, 0x78a5636f);
        step(58, g, h, a, b, c, d, e, f, 0x84c87814);
        step(59, f, g, h, a, b, c, d, e, 0x8cc70208);
        step(60, e, f, g, h, a, b, c, d, 0x90befffa);
        step(61, d, e, f, g, h, a, b, c, 0xa4506ceb);
        step(62, c, d, e, f, g, h, a, b, 0xbef9a3f7);
        step(63, b, c, d, e, f, g, h, a, 0xc67178f2);

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

void
sha256_for_mh_sha256(const uint8_t *input_data, uint32_t *digest, const uint32_t len)
{
        uint32_t i, j;
        uint8_t buf[2 * ISAL_SHA256_BLOCK_SIZE];

        digest[0] = MH_SHA256_H0;
        digest[1] = MH_SHA256_H1;
        digest[2] = MH_SHA256_H2;
        digest[3] = MH_SHA256_H3;
        digest[4] = MH_SHA256_H4;
        digest[5] = MH_SHA256_H5;
        digest[6] = MH_SHA256_H6;
        digest[7] = MH_SHA256_H7;

        i = len;
        while (i >= ISAL_SHA256_BLOCK_SIZE) {
                sha256_single_for_mh_sha256(input_data, digest);
                input_data += ISAL_SHA256_BLOCK_SIZE;
                i -= ISAL_SHA256_BLOCK_SIZE;
        }

        memcpy(buf, input_data, i);
        buf[i++] = 0x80;
        for (j = i; j < ((2 * ISAL_SHA256_BLOCK_SIZE) - 8); j++)
                buf[j] = 0;

        if (i > ISAL_SHA256_BLOCK_SIZE - 8)
                i = 2 * ISAL_SHA256_BLOCK_SIZE;
        else
                i = ISAL_SHA256_BLOCK_SIZE;

        *(uint64_t *) (buf + i - 8) = to_be64((uint64_t) len * 8);

        sha256_single_for_mh_sha256(buf, digest);
        if (i == (2 * ISAL_SHA256_BLOCK_SIZE))
                sha256_single_for_mh_sha256(buf + ISAL_SHA256_BLOCK_SIZE, digest);
}