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Fix to improve fp_copy performance without ALT_ECC_SIZE defined. This change is required for async because we can’t memcpy/memset the entire fp_int.

pull/679/head
David Garske 2016-12-28 16:47:14 -08:00
parent 338cc9e873
commit 19ee499c96
2 changed files with 26 additions and 12 deletions
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34
wolfcrypt/src/tfm.c
View File

@ -2348,18 +2348,32 @@ int mp_div_2d(fp_int* a, int b, fp_int* c, fp_int* d)
void fp_copy(fp_int *a, fp_int *b)
{
if (a != b && b->size >= a->used) {
int x, oldused;
oldused = b->used;
/* if source and destination are different */
if (a != b) {
#ifdef ALT_ECC_SIZE
/* verify a will fit in b */
if (b->size >= a->used) {
int x, oldused;
oldused = b->used;
b->used = a->used;
b->sign = a->sign;
XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit));
/* zero any excess digits on the destination that we didn't write to */
for (x = b->used; x < oldused; x++) {
b->dp[x] = 0;
}
}
else {
/* TODO: Handle error case */
}
#else
/* all dp's are same size, so do straight copy */
b->used = a->used;
b->sign = a->sign;
XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit));
/* zero any excess digits on the destination that we didn't write to */
for (x = b->used; x < oldused; x++) {
b->dp[x] = 0;
}
XMEMCPY(b->dp, a->dp, FP_SIZE * sizeof(fp_digit));
#endif
}
}

4
wolfssl/wolfcrypt/tfm.h
View File

@ -283,8 +283,8 @@
/* a FP type */
typedef struct fp_int {
int used,
sign;
int used;
int sign;
int size;
fp_digit dp[FP_SIZE];
#ifdef WOLFSSL_ASYNC_CRYPT