xref: /isa-l_crypto/sha256_mb/sha256_ref.c (revision 0a437795c8360736f38dfa5934aa03a1861d784c)

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  modification, are permitted provided that the following conditions
  are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include <string.h>
#include "sha256_mb.h"
#include "endian_helper.h"

////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Reference SHA256 Functions
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////

#if (__GNUC__ >= 11)
#define OPT_FIX __attribute__((noipa))
#else
#define OPT_FIX
#endif

#define H0 0x6a09e667
#define H1 0xbb67ae85
#define H2 0x3c6ef372
#define H3 0xa54ff53a
#define H4 0x510e527f
#define H5 0x9b05688c
#define H6 0x1f83d9ab
#define H7 0x5be0cd19

#define ror32(x, r) (((x) >> (r)) ^ ((x) << (32 - (r))))

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

#define S0(w) (ror32(w, 7) ^ ror32(w, 18) ^ (w >> 3))
#define S1(w) (ror32(w, 17) ^ ror32(w, 19) ^ (w >> 10))

#define s0(a)        (ror32(a, 2) ^ ror32(a, 13) ^ ror32(a, 22))
#define s1(e)        (ror32(e, 6) ^ ror32(e, 11) ^ ror32(e, 25))
#define maj(a, b, c) ((a & b) ^ (a & c) ^ (b & c))
#define ch(e, f, g)  ((e & f) ^ (g & ~e))

#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;

static void OPT_FIX
sha256_single(const uint8_t *data, uint32_t digest[]);

void
sha256_ref(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] = H0;
        digest[1] = H1;
        digest[2] = H2;
        digest[3] = H3;
        digest[4] = H4;
        digest[5] = H5;
        digest[6] = H6;
        digest[7] = H7;

        i = len;
        while (i >= ISAL_SHA256_BLOCK_SIZE) {
                sha256_single(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) - ISAL_SHA256_PADLENGTHFIELD_SIZE); j++)
                buf[j] = 0;

        if (i > ISAL_SHA256_BLOCK_SIZE - ISAL_SHA256_PADLENGTHFIELD_SIZE)
                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(buf, digest);
        if (i == 2 * ISAL_SHA256_BLOCK_SIZE)
                sha256_single(buf + ISAL_SHA256_BLOCK_SIZE, digest);
}

void
sha256_single(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;
}