xref: /isa-l_crypto/sha512_mb/sha512_ref.c (revision 592e639e5cd0e9fa1a927dd7459a23176ec36070)

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  modification, are permitted provided that the following conditions
  are met:
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

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#include <string.h>
#include "sha512_mb.h"
#include "endian_helper.h"

////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Reference SHA512 Functions
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////

#define H0 0x6a09e667f3bcc908
#define H1 0xbb67ae8584caa73b
#define H2 0x3c6ef372fe94f82b
#define H3 0xa54ff53a5f1d36f1
#define H4 0x510e527fade682d1
#define H5 0x9b05688c2b3e6c1f
#define H6 0x1f83d9abfb41bd6b
#define H7 0x5be0cd19137e2179

void
sha512_single(const uint8_t *data, uint64_t digest[]);

void
sha512_ref(uint8_t *input_data, uint64_t *digest, uint32_t len)
{
        uint32_t i, j;
        uint8_t buf[2 * ISAL_SHA512_BLOCK_SIZE];

        /* 128 bit lengths not needed as len is uint32_t, so use 64 bit length
         * and pad the first 64 bits with zeros. */

        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;
        /* Hash the complete blocks */
        while (i >= ISAL_SHA512_BLOCK_SIZE) {
                sha512_single(input_data, digest);
                input_data += ISAL_SHA512_BLOCK_SIZE;
                i -= ISAL_SHA512_BLOCK_SIZE;
        }

        /* Copy remainder to a buffer to be padded */
        memcpy(buf, input_data, i);
        buf[i++] = 0x80;

        // Pad more than required here and overwrite with length
        for (j = i; j < (2 * ISAL_SHA512_BLOCK_SIZE); j++)
                buf[j] = 0;

        if (i > ISAL_SHA512_BLOCK_SIZE - ISAL_SHA512_PADLENGTHFIELD_SIZE)
                i = 2 * ISAL_SHA512_BLOCK_SIZE;
        else
                i = ISAL_SHA512_BLOCK_SIZE;

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

        /* Hash the padded last block */
        sha512_single(buf, digest);
        if (i == 256)
                sha512_single(buf + 128, digest);
}

/* From the FIPS, these are the same as for SHA256, but operating on 64 bit words
 * instead of 32 bit.
 */
#define ch(e, f, g)  ((e & f) ^ (g & ~e))
#define maj(a, b, c) ((a & b) ^ (a & c) ^ (b & c))

/* Sigma functions have same form as SHA256 but
 * 	- change the word size to 64bit
 * 	- change the amount to rotate
 */
#define ror64(x, r) (((x) >> (r)) ^ ((x) << (64 - (r))))

/* Technically, s0 should be S0 as these are "capital sigma" functions, and likewise the case
 * of the  S0 should be s0, but keep as-is to avoid confusion with the other reference functions.
 */
#define s0(a) (ror64(a, 28) ^ ror64(a, 34) ^ ror64(a, 39))
#define s1(e) (ror64(e, 14) ^ ror64(e, 18) ^ ror64(e, 41))

#define S0(w) (ror64(w, 1) ^ ror64(w, 8) ^ (w >> 7))
#define S1(w) (ror64(w, 19) ^ ror64(w, 61) ^ (w >> 6))

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

#define step(i, a, b, c, d, e, f, g, h, k)                                                         \
        if (i < 16)                                                                                \
                W(i) = to_be64(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
sha512_single(const uint8_t *data, uint64_t digest[])
{
        /* Check these are all uint64_t */
        uint64_t a, b, c, d, e, f, g, h, t1, t2;
        uint64_t w[16];
        uint64_t *ww = (uint64_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, 0x428a2f98d728ae22);
        step(1, h, a, b, c, d, e, f, g, 0x7137449123ef65cd);
        step(2, g, h, a, b, c, d, e, f, 0xb5c0fbcfec4d3b2f);
        step(3, f, g, h, a, b, c, d, e, 0xe9b5dba58189dbbc);
        step(4, e, f, g, h, a, b, c, d, 0x3956c25bf348b538);
        step(5, d, e, f, g, h, a, b, c, 0x59f111f1b605d019);
        step(6, c, d, e, f, g, h, a, b, 0x923f82a4af194f9b);
        step(7, b, c, d, e, f, g, h, a, 0xab1c5ed5da6d8118);
        step(8, a, b, c, d, e, f, g, h, 0xd807aa98a3030242);
        step(9, h, a, b, c, d, e, f, g, 0x12835b0145706fbe);
        step(10, g, h, a, b, c, d, e, f, 0x243185be4ee4b28c);
        step(11, f, g, h, a, b, c, d, e, 0x550c7dc3d5ffb4e2);
        step(12, e, f, g, h, a, b, c, d, 0x72be5d74f27b896f);
        step(13, d, e, f, g, h, a, b, c, 0x80deb1fe3b1696b1);
        step(14, c, d, e, f, g, h, a, b, 0x9bdc06a725c71235);
        step(15, b, c, d, e, f, g, h, a, 0xc19bf174cf692694);
        step(16, a, b, c, d, e, f, g, h, 0xe49b69c19ef14ad2);
        step(17, h, a, b, c, d, e, f, g, 0xefbe4786384f25e3);
        step(18, g, h, a, b, c, d, e, f, 0x0fc19dc68b8cd5b5);
        step(19, f, g, h, a, b, c, d, e, 0x240ca1cc77ac9c65);
        step(20, e, f, g, h, a, b, c, d, 0x2de92c6f592b0275);
        step(21, d, e, f, g, h, a, b, c, 0x4a7484aa6ea6e483);
        step(22, c, d, e, f, g, h, a, b, 0x5cb0a9dcbd41fbd4);
        step(23, b, c, d, e, f, g, h, a, 0x76f988da831153b5);
        step(24, a, b, c, d, e, f, g, h, 0x983e5152ee66dfab);
        step(25, h, a, b, c, d, e, f, g, 0xa831c66d2db43210);
        step(26, g, h, a, b, c, d, e, f, 0xb00327c898fb213f);
        step(27, f, g, h, a, b, c, d, e, 0xbf597fc7beef0ee4);
        step(28, e, f, g, h, a, b, c, d, 0xc6e00bf33da88fc2);
        step(29, d, e, f, g, h, a, b, c, 0xd5a79147930aa725);
        step(30, c, d, e, f, g, h, a, b, 0x06ca6351e003826f);
        step(31, b, c, d, e, f, g, h, a, 0x142929670a0e6e70);
        step(32, a, b, c, d, e, f, g, h, 0x27b70a8546d22ffc);
        step(33, h, a, b, c, d, e, f, g, 0x2e1b21385c26c926);
        step(34, g, h, a, b, c, d, e, f, 0x4d2c6dfc5ac42aed);
        step(35, f, g, h, a, b, c, d, e, 0x53380d139d95b3df);
        step(36, e, f, g, h, a, b, c, d, 0x650a73548baf63de);
        step(37, d, e, f, g, h, a, b, c, 0x766a0abb3c77b2a8);
        step(38, c, d, e, f, g, h, a, b, 0x81c2c92e47edaee6);
        step(39, b, c, d, e, f, g, h, a, 0x92722c851482353b);
        step(40, a, b, c, d, e, f, g, h, 0xa2bfe8a14cf10364);
        step(41, h, a, b, c, d, e, f, g, 0xa81a664bbc423001);
        step(42, g, h, a, b, c, d, e, f, 0xc24b8b70d0f89791);
        step(43, f, g, h, a, b, c, d, e, 0xc76c51a30654be30);
        step(44, e, f, g, h, a, b, c, d, 0xd192e819d6ef5218);
        step(45, d, e, f, g, h, a, b, c, 0xd69906245565a910);
        step(46, c, d, e, f, g, h, a, b, 0xf40e35855771202a);
        step(47, b, c, d, e, f, g, h, a, 0x106aa07032bbd1b8);
        step(48, a, b, c, d, e, f, g, h, 0x19a4c116b8d2d0c8);
        step(49, h, a, b, c, d, e, f, g, 0x1e376c085141ab53);
        step(50, g, h, a, b, c, d, e, f, 0x2748774cdf8eeb99);
        step(51, f, g, h, a, b, c, d, e, 0x34b0bcb5e19b48a8);
        step(52, e, f, g, h, a, b, c, d, 0x391c0cb3c5c95a63);
        step(53, d, e, f, g, h, a, b, c, 0x4ed8aa4ae3418acb);
        step(54, c, d, e, f, g, h, a, b, 0x5b9cca4f7763e373);
        step(55, b, c, d, e, f, g, h, a, 0x682e6ff3d6b2b8a3);
        step(56, a, b, c, d, e, f, g, h, 0x748f82ee5defb2fc);
        step(57, h, a, b, c, d, e, f, g, 0x78a5636f43172f60);
        step(58, g, h, a, b, c, d, e, f, 0x84c87814a1f0ab72);
        step(59, f, g, h, a, b, c, d, e, 0x8cc702081a6439ec);
        step(60, e, f, g, h, a, b, c, d, 0x90befffa23631e28);
        step(61, d, e, f, g, h, a, b, c, 0xa4506cebde82bde9);
        step(62, c, d, e, f, g, h, a, b, 0xbef9a3f7b2c67915);
        step(63, b, c, d, e, f, g, h, a, 0xc67178f2e372532b); // step 63
        step(64, a, b, c, d, e, f, g, h, 0xca273eceea26619c);
        step(65, h, a, b, c, d, e, f, g, 0xd186b8c721c0c207);
        step(66, g, h, a, b, c, d, e, f, 0xeada7dd6cde0eb1e);
        step(67, f, g, h, a, b, c, d, e, 0xf57d4f7fee6ed178);
        step(68, e, f, g, h, a, b, c, d, 0x06f067aa72176fba);
        step(69, d, e, f, g, h, a, b, c, 0x0a637dc5a2c898a6);
        step(70, c, d, e, f, g, h, a, b, 0x113f9804bef90dae);
        step(71, b, c, d, e, f, g, h, a, 0x1b710b35131c471b);
        step(72, a, b, c, d, e, f, g, h, 0x28db77f523047d84);
        step(73, h, a, b, c, d, e, f, g, 0x32caab7b40c72493);
        step(74, g, h, a, b, c, d, e, f, 0x3c9ebe0a15c9bebc);
        step(75, f, g, h, a, b, c, d, e, 0x431d67c49c100d4c);
        step(76, e, f, g, h, a, b, c, d, 0x4cc5d4becb3e42b6);
        step(77, d, e, f, g, h, a, b, c, 0x597f299cfc657e2a);
        step(78, c, d, e, f, g, h, a, b, 0x5fcb6fab3ad6faec);
        step(79, b, c, d, e, f, g, h, a, 0x6c44198c4a475817); // step 79

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