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Fix for TFM _fp_exptmod_nct with WOLFSSL_NO_MALLOC.

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This commit is contained in:
David Garske
2020-05-28 15:10:24 -07:00
parent fd51eecb4f
commit 10a1cad2dc
1 changed files with 35 additions and 1 deletions
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36
wolfcrypt/src/tfm.c
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@ -1710,9 +1710,13 @@ static int _fp_exptmod_ct(fp_int * G, fp_int * X, int digits, fp_int * P,
static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
{
fp_int *res;
fp_int *M;
fp_digit buf, mp;
int err, bitbuf, bitcpy, bitcnt, mode, digidx, x, y, winsize;
#ifndef WOLFSSL_NO_MALLOC
fp_int *M;
#else
fp_int M[(1 << 6) + 1];
#endif
/* find window size */
x = fp_count_bits (X);
@ -1733,12 +1737,14 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
return err;
}
#ifndef WOLFSSL_NO_MALLOC
/* only allocate space for what's needed for window plus res */
M = (fp_int*)XMALLOC(sizeof(fp_int)*((1 << winsize) + 1), NULL,
DYNAMIC_TYPE_BIGINT);
if (M == NULL) {
return FP_MEM;
}
#endif
res = &M[(word32)(1 << winsize)];
/* init M array */
@ -1774,7 +1780,9 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
fp_sqr (&M[(word32)(1 << (winsize - 1))], &M[(word32)(1 << (winsize - 1))]);
err = fp_montgomery_reduce (&M[(word32)(1 << (winsize - 1))], P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
}
@ -1783,12 +1791,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
for (x = (1 << (winsize - 1)) + 1; x < (1 << winsize); x++) {
err = fp_mul(&M[x - 1], &M[1], &M[x]);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
err = fp_montgomery_reduce(&M[x], P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
}
@ -1830,12 +1842,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
if (mode == 1 && y == 0) {
err = fp_sqr(res, res);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
fp_montgomery_reduce(res, P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
continue;
@ -1851,12 +1867,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
for (x = 0; x < winsize; x++) {
err = fp_sqr(res, res);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
err = fp_montgomery_reduce(res, P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
}
@ -1864,12 +1884,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
/* then multiply */
err = fp_mul(res, &M[bitbuf], res);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
err = fp_montgomery_reduce(res, P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
@ -1886,12 +1910,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
for (x = 0; x < bitcpy; x++) {
err = fp_sqr(res, res);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
err = fp_montgomery_reduce(res, P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
@ -1901,12 +1929,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
/* then multiply */
err = fp_mul(res, &M[1], res);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
err = fp_montgomery_reduce(res, P, mp);
if (err != FP_OKAY) {
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}
}
@ -1924,7 +1956,9 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
/* swap res with Y */
fp_copy (res, Y);
#ifndef WOLFSSL_NO_MALLOC
XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
#endif
return err;
}