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Add impl of mbedtls_ct_zeroize_if

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-17 12:12:44 +01:00
parent 1c4eaa121f
commit debf8679e0
1 changed files with 19 additions and 0 deletions
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19
library/constant_time.c
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@ -399,3 +399,22 @@ void mbedtls_ct_memcpy_offset(unsigned char *dest,
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
#if defined(MBEDTLS_PKCS1_V15) && defined(MBEDTLS_RSA_C) && !defined(MBEDTLS_RSA_ALT)
void mbedtls_ct_zeroize_if(mbedtls_ct_condition_t condition, void *buf, size_t len)
{
uint32_t mask = (uint32_t) ~condition;
uint8_t *p = (uint8_t *) buf;
size_t i = 0;
#if defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS)
for (; (i + 4) <= len; i += 4) {
mbedtls_put_unaligned_uint32((void *) (p + i),
mbedtls_get_unaligned_uint32((void *) (p + i)) & mask);
}
#endif
for (; i < len; i++) {
p[i] = p[i] & mask;
}
}
#endif /* defined(MBEDTLS_PKCS1_V15) && defined(MBEDTLS_RSA_C) && !defined(MBEDTLS_RSA_ALT) */