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Fix in SP math for casting signed -1 to unsigned.

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This commit is contained in:
David Garske 2020-09-08 14:16:11 -07:00
parent 7fd51cf9d9
commit b8bdeec940
2 changed files with 8 additions and 6 deletions
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2
wolfcrypt/src/sp_int.c
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@ -950,7 +950,7 @@ static int sp_div(sp_int* a, sp_int* d, sp_int* r, sp_int* rem)
}
for (i = sa->used - 1; i >= d->used; i--) {
if (sa->dp[i] == dt) {
t = (sp_digit)-1;
t = SP_MASK; /* f's */
}
else {
t = sp_div_word(sa->dp[i], sa->dp[i-1], dt);

12
wolfssl/wolfcrypt/sp_int.h
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@ -85,8 +85,6 @@ This library provides single precision (SP) integer math functions.
#endif
typedef uint128_t sp_int_word;
typedef int128_t sp_int_sword;
#else
#error Word size not defined
#endif
#else
#if SP_WORD_SIZE == 32
@ -106,12 +104,16 @@ This library provides single precision (SP) integer math functions.
#endif
typedef uint128_t sp_int_word;
typedef int128_t sp_int_sword;
#else
#error Word size not defined
#endif
#endif
#define SP_MASK (sp_digit)(-1)
#if SP_WORD_SIZE == 32
#define SP_MASK ((sp_digit)0xffffffff)
#elif SP_WORD_SIZE == 64
#define SP_MASK ((sp_digit)0xffffffffffffffff)
#else
#error Word size not defined
#endif
#if defined(WOLFSSL_HAVE_SP_ECC) && defined(WOLFSSL_SP_NONBLOCK)