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bignum: Updated mbedtls_mpi_shift_l to use the core method.

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Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2023-05-02 14:02:32 +01:00
parent f0806bee66
commit 0144b35f7d
1 changed files with 2 additions and 30 deletions
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32
library/bignum.c
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@ -750,13 +750,9 @@ int mbedtls_mpi_write_binary(const mbedtls_mpi *X,
int mbedtls_mpi_shift_l(mbedtls_mpi *X, size_t count) int mbedtls_mpi_shift_l(mbedtls_mpi *X, size_t count)
{ {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i, v0, t1; size_t i;
mbedtls_mpi_uint r0 = 0, r1;
MPI_VALIDATE_RET(X != NULL); MPI_VALIDATE_RET(X != NULL);
v0 = count / (biL);
t1 = count & (biL - 1);
i = mbedtls_mpi_bitlen(X) + count; i = mbedtls_mpi_bitlen(X) + count;
if (X->n * biL < i) { if (X->n * biL < i) {
@ -765,31 +761,7 @@ int mbedtls_mpi_shift_l(mbedtls_mpi *X, size_t count)
ret = 0; ret = 0;
/* mbedtls_mpi_core_shift_l(X->p, X->n, count);
* shift by count / limb_size
*/
if (v0 > 0) {
for (i = X->n; i > v0; i--) {
X->p[i - 1] = X->p[i - v0 - 1];
}
for (; i > 0; i--) {
X->p[i - 1] = 0;
}
}
/*
* shift by count % limb_size
*/
if (t1 > 0) {
for (i = v0; i < X->n; i++) {
r1 = X->p[i] >> (biL - t1);
X->p[i] <<= t1;
X->p[i] |= r0;
r0 = r1;
}
}
cleanup: cleanup:
return ret; return ret;