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Merge pull request #4158 from dgarske/nxp_ltc_rsa2

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Fixes for NXP LTC with RSA and Blinding
This commit is contained in:
Sean Parkinson
2021-06-24 12:14:04 +10:00
committed by GitHub
parent ae2f2b246e 73c90369c6
commit 92a4e30b69
3 changed files with 12 additions and 9 deletions
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18
wolfcrypt/src/port/nxp/ksdk_port.c
View File

@@ -405,6 +405,7 @@ int mp_invmod(mp_int *a, mp_int *b, mp_int *c)
}
/* d = a * b (mod c) */
/* with blinding enabled ptr a can equal ptr d */
int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
{
int res = MP_OKAY;
@@ -422,8 +423,9 @@ int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
szB = mp_unsigned_bin_size(b);
szC = mp_unsigned_bin_size(c);
if ((szA <= LTC_MAX_INT_BYTES) && (szB <= LTC_MAX_INT_BYTES) &&
(szC <= LTC_MAX_INT_BYTES))
/* LTC hardware seems to have issue with ModMul with 511 bytes or more,
so use software math */
if ((szA + szB < LTC_MAX_INT_BYTES-1) && (szC <= LTC_MAX_INT_BYTES))
{
uint8_t *ptrA, *ptrB, *ptrC, *ptrD;
@@ -432,15 +434,15 @@ int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
ptrC = (uint8_t*)XMALLOC(LTC_MAX_INT_BYTES, NULL, DYNAMIC_TYPE_BIGINT);
ptrD = (uint8_t*)XMALLOC(LTC_MAX_INT_BYTES, NULL, DYNAMIC_TYPE_BIGINT);
/* unsigned multiply */
#if (!defined(WOLFSSL_SP_MATH) && !defined(WOLFSSL_SP_MATH_ALL)) || \
defined(WOLFSSL_SP_INT_NEGATIVE)
int neg = (a->sign == b->sign) ? MP_ZPOS : MP_NEG;
#endif
if (ptrA && ptrB && ptrC && ptrD) {
uint16_t sizeA, sizeB, sizeC, sizeD = 0;
/* unsigned multiply */
#if (!defined(WOLFSSL_SP_MATH) && !defined(WOLFSSL_SP_MATH_ALL)) || \
defined(WOLFSSL_SP_INT_NEGATIVE)
int neg = (a->sign == b->sign) ? MP_ZPOS : MP_NEG;
#endif
/* Multiply A * B = D */
res = ltc_get_lsb_bin_from_mp_int(ptrA, a, &sizeA);
if (res == MP_OKAY)

2
wolfcrypt/src/rsa.c
View File

@@ -2434,7 +2434,7 @@ static int wc_RsaFunctionSync(const byte* in, word32 inLen, byte* out,
/* unblind */
if (ret == 0 && mp_mulmod(tmp, rndi, &key->n, tmp) != MP_OKAY)
ret = MP_MULMOD_E;
#endif /* WC_RSA_BLINDING */
#endif /* WC_RSA_BLINDING */
break;
}

1
wolfssl/wolfcrypt/port/nxp/ksdk_port.h
View File

@@ -46,6 +46,7 @@ int ksdk_port_init(void);
int wolfcrypt_mp_mod(mp_int *a, mp_int *b, mp_int *c);
int wolfcrypt_mp_invmod(mp_int *a, mp_int *b, mp_int *c);
int wolfcrypt_mp_exptmod(mp_int *G, mp_int *X, mp_int *P, mp_int *Y);
int wolfcrypt_mp_prime_is_prime_ex(mp_int* a, int t, int* result, WC_RNG* rng);
/* Exported mp_mulmod function */
int mp_mulmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d);