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rshb check range of n

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This commit is contained in:
Sean Parkinson
2020-07-13 15:24:59 +10:00
parent fbe0c8cba7
commit 52d363390a
3 changed files with 40 additions and 11 deletions
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11
wolfcrypt/src/integer.c
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@@ -562,6 +562,17 @@ void mp_rshb (mp_int *c, int x)
mp_digit r, rr; mp_digit r, rr;
mp_digit D = x; mp_digit D = x;
/* shifting by a negative number not supported */
if (x < 0) return;
/* shift digits first if needed */
if (x >= DIGIT_BIT) {
mp_rshd(c, x / DIGIT_BIT);
/* recalculate number of bits to shift */
D = x % DIGIT_BIT;
}
/* zero shifted is always zero */
if (mp_iszero(c)) return; if (mp_iszero(c)) return;
/* mask */ /* mask */

29
wolfcrypt/src/sp_int.c
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@@ -46,7 +46,7 @@
* WOLFSSL_SP_4096: Enable RSA/RH 4096-bit support * WOLFSSL_SP_4096: Enable RSA/RH 4096-bit support
* WOLFSSL_SP_384 Enable ECC 384-bit SECP384R1 support * WOLFSSL_SP_384 Enable ECC 384-bit SECP384R1 support
* WOLFSSL_SP_NO_256 Disable ECC 256-bit SECP256R1 support * WOLFSSL_SP_NO_256 Disable ECC 256-bit SECP256R1 support
* WOLFSSL_SP_CACHE_RESISTANT Enable cache resistantant code * WOLFSSL_SP_CACHE_RESISTANT Enable cache resistantant code
* WOLFSSL_SP_ASM Enable assembly speedups (detect platform) * WOLFSSL_SP_ASM Enable assembly speedups (detect platform)
* WOLFSSL_SP_X86_64_ASM Enable Intel x86 assembly speedups like AVX/AVX2 * WOLFSSL_SP_X86_64_ASM Enable Intel x86 assembly speedups like AVX/AVX2
* WOLFSSL_SP_ARM32_ASM Enable Aarch32 assembly speedups * WOLFSSL_SP_ARM32_ASM Enable Aarch32 assembly speedups
@@ -658,21 +658,28 @@ int sp_sub(sp_int* a, sp_int* b, sp_int* r)
*/ */
void sp_rshb(sp_int* a, int n, sp_int* r) void sp_rshb(sp_int* a, int n, sp_int* r)
{ {
int i; int i = n / SP_WORD_SIZE;
int j; int j;
int s = n % SP_WORD_SIZE;
if (s == 0) { if (i >= a->used) {
for (i = n / SP_WORD_SIZE, j = 0; i < a->used-1; i++, j++) r->dp[0] = 0;
r->dp[j] = a->dp[i]; r->used = 0;
} }
else { else {
for (i = n / SP_WORD_SIZE, j = 0; i < a->used-1; i++, j++) n %= SP_WORD_SIZE;
r->dp[j] = (a->dp[i] >> s) | (a->dp[i+1] << (SP_WORD_SIZE - s)); if (n == 0) {
for (j = 0; i < a->used; i++, j++)
r->dp[j] = a->dp[i];
r->used = j;
}
if (n > 0) {
for (j = 0; i < a->used-1; i++, j++)
r->dp[j] = (a->dp[i] >> n) | (a->dp[i+1] << (SP_WORD_SIZE - n));
r->dp[j] = a->dp[i] >> n;
r->used = j + 1;
sp_clamp(r);
}
} }
r->dp[j] = a->dp[i] >> s;
r->used = j + 1;
sp_clamp(r);
} }
/* Multiply a by digit n and put result into r shifting up o digits. /* Multiply a by digit n and put result into r shifting up o digits.

11
wolfcrypt/src/tfm.c
View File

@@ -3415,6 +3415,17 @@ void fp_rshb(fp_int *c, int x)
fp_digit r, rr; fp_digit r, rr;
fp_digit D = x; fp_digit D = x;
/* shifting by a negative number not supported */
if (x < 0) return;
/* shift digits first if needed */
if (x >= DIGIT_BIT) {
fp_rshd(c, x / DIGIT_BIT);
/* recalculate number of bits to shift */
D = x % DIGIT_BIT;
}
/* zero shifted is always zero */
if (fp_iszero(c)) return; if (fp_iszero(c)) return;
/* mask */ /* mask */