xref: /isa-l_crypto/sha1_mb/sha1_ref.c (revision 0106da915b7024075fc74900ff63fa931ac15475)

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#include <string.h>
#include "sha1_mb.h"
#include "endian_helper.h"

////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Reference SHA1 Functions
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////

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

#define H0 0x67452301
#define H1 0xefcdab89
#define H2 0x98badcfe
#define H3 0x10325476
#define H4 0xc3d2e1f0

#define F1(b, c, d) (d ^ (b & (c ^ d)))
#define F2(b, c, d) (b ^ c ^ d)
#define F3(b, c, d) ((b & c) | (d & (b | c)))
#define F4(b, c, d) (b ^ c ^ d)

#define rol32(x, r) (((x) << (r)) ^ ((x) >> (32 - (r))))

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

#define step00_19(i, a, b, c, d, e)                                                                \
        if (i > 15)                                                                                \
                W(i) = rol32(W(i - 3) ^ W(i - 8) ^ W(i - 14) ^ W(i - 16), 1);                      \
        else                                                                                       \
                W(i) = to_be32(ww[i]);                                                             \
        e += rol32(a, 5) + F1(b, c, d) + 0x5A827999 + W(i);                                        \
        b = rol32(b, 30)

#define step20_39(i, a, b, c, d, e)                                                                \
        W(i) = rol32(W(i - 3) ^ W(i - 8) ^ W(i - 14) ^ W(i - 16), 1);                              \
        e += rol32(a, 5) + F2(b, c, d) + 0x6ED9EBA1 + W(i);                                        \
        b = rol32(b, 30)

#define step40_59(i, a, b, c, d, e)                                                                \
        W(i) = rol32(W(i - 3) ^ W(i - 8) ^ W(i - 14) ^ W(i - 16), 1);                              \
        e += rol32(a, 5) + F3(b, c, d) + 0x8F1BBCDC + W(i);                                        \
        b = rol32(b, 30)

#define step60_79(i, a, b, c, d, e)                                                                \
        W(i) = rol32(W(i - 3) ^ W(i - 8) ^ W(i - 14) ^ W(i - 16), 1);                              \
        e += rol32(a, 5) + F4(b, c, d) + 0xCA62C1D6 + W(i);                                        \
        b = rol32(b, 30)

static void OPT_FIX
sha1_single(const uint8_t *data, uint32_t digest[]);

void
sha1_ref(const uint8_t *input_data, uint32_t *digest, const uint32_t len)
{
        uint32_t i, j;
        uint8_t buf[2 * ISAL_SHA1_BLOCK_SIZE];

        digest[0] = H0;
        digest[1] = H1;
        digest[2] = H2;
        digest[3] = H3;
        digest[4] = H4;

        i = len;
        while (i >= ISAL_SHA1_BLOCK_SIZE) {
                sha1_single(input_data, digest);
                input_data += ISAL_SHA1_BLOCK_SIZE;
                i -= ISAL_SHA1_BLOCK_SIZE;
        }

        memcpy(buf, input_data, i);
        buf[i++] = 0x80;
        for (j = i; j < ((2 * ISAL_SHA1_BLOCK_SIZE) - ISAL_SHA1_PADLENGTHFIELD_SIZE); j++)
                buf[j] = 0;

        if (i > ISAL_SHA1_BLOCK_SIZE - ISAL_SHA1_PADLENGTHFIELD_SIZE)
                i = 2 * ISAL_SHA1_BLOCK_SIZE;
        else
                i = ISAL_SHA1_BLOCK_SIZE;

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

        sha1_single(buf, digest);
        if (i == (2 * ISAL_SHA1_BLOCK_SIZE))
                sha1_single(buf + ISAL_SHA1_BLOCK_SIZE, digest);
}

void
sha1_single(const uint8_t *data, uint32_t digest[])
{
        uint32_t a, b, c, d, e;
        uint32_t w[16] = { 0 };
        uint32_t *ww = (uint32_t *) data;

        a = digest[0];
        b = digest[1];
        c = digest[2];
        d = digest[3];
        e = digest[4];

        step00_19(0, a, b, c, d, e);
        step00_19(1, e, a, b, c, d);
        step00_19(2, d, e, a, b, c);
        step00_19(3, c, d, e, a, b);
        step00_19(4, b, c, d, e, a);
        step00_19(5, a, b, c, d, e);
        step00_19(6, e, a, b, c, d);
        step00_19(7, d, e, a, b, c);
        step00_19(8, c, d, e, a, b);
        step00_19(9, b, c, d, e, a);
        step00_19(10, a, b, c, d, e);
        step00_19(11, e, a, b, c, d);
        step00_19(12, d, e, a, b, c);
        step00_19(13, c, d, e, a, b);
        step00_19(14, b, c, d, e, a);
        step00_19(15, a, b, c, d, e);
        step00_19(16, e, a, b, c, d);
        step00_19(17, d, e, a, b, c);
        step00_19(18, c, d, e, a, b);
        step00_19(19, b, c, d, e, a);

        step20_39(20, a, b, c, d, e);
        step20_39(21, e, a, b, c, d);
        step20_39(22, d, e, a, b, c);
        step20_39(23, c, d, e, a, b);
        step20_39(24, b, c, d, e, a);
        step20_39(25, a, b, c, d, e);
        step20_39(26, e, a, b, c, d);
        step20_39(27, d, e, a, b, c);
        step20_39(28, c, d, e, a, b);
        step20_39(29, b, c, d, e, a);
        step20_39(30, a, b, c, d, e);
        step20_39(31, e, a, b, c, d);
        step20_39(32, d, e, a, b, c);
        step20_39(33, c, d, e, a, b);
        step20_39(34, b, c, d, e, a);
        step20_39(35, a, b, c, d, e);
        step20_39(36, e, a, b, c, d);
        step20_39(37, d, e, a, b, c);
        step20_39(38, c, d, e, a, b);
        step20_39(39, b, c, d, e, a);

        step40_59(40, a, b, c, d, e);
        step40_59(41, e, a, b, c, d);
        step40_59(42, d, e, a, b, c);
        step40_59(43, c, d, e, a, b);
        step40_59(44, b, c, d, e, a);
        step40_59(45, a, b, c, d, e);
        step40_59(46, e, a, b, c, d);
        step40_59(47, d, e, a, b, c);
        step40_59(48, c, d, e, a, b);
        step40_59(49, b, c, d, e, a);
        step40_59(50, a, b, c, d, e);
        step40_59(51, e, a, b, c, d);
        step40_59(52, d, e, a, b, c);
        step40_59(53, c, d, e, a, b);
        step40_59(54, b, c, d, e, a);
        step40_59(55, a, b, c, d, e);
        step40_59(56, e, a, b, c, d);
        step40_59(57, d, e, a, b, c);
        step40_59(58, c, d, e, a, b);
        step40_59(59, b, c, d, e, a);

        step60_79(60, a, b, c, d, e);
        step60_79(61, e, a, b, c, d);
        step60_79(62, d, e, a, b, c);
        step60_79(63, c, d, e, a, b);
        step60_79(64, b, c, d, e, a);
        step60_79(65, a, b, c, d, e);
        step60_79(66, e, a, b, c, d);
        step60_79(67, d, e, a, b, c);
        step60_79(68, c, d, e, a, b);
        step60_79(69, b, c, d, e, a);
        step60_79(70, a, b, c, d, e);
        step60_79(71, e, a, b, c, d);
        step60_79(72, d, e, a, b, c);
        step60_79(73, c, d, e, a, b);
        step60_79(74, b, c, d, e, a);
        step60_79(75, a, b, c, d, e);
        step60_79(76, e, a, b, c, d);
        step60_79(77, d, e, a, b, c);
        step60_79(78, c, d, e, a, b);
        step60_79(79, b, c, d, e, a);

        digest[0] += a;
        digest[1] += b;
        digest[2] += c;
        digest[3] += d;
        digest[4] += e;
}