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Don't explicitly inline mbedtls_mpi_core_clz

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-04-27 14:20:30 +01:00
parent 3b29364d61
commit 914347bfa3
2 changed files with 34 additions and 32 deletions
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33
library/bignum_core.c
View file

@ -33,6 +33,39 @@
#include "bn_mul.h"
#include "constant_time_internal.h"
size_t mbedtls_mpi_core_clz(mbedtls_mpi_uint a)
{
#if defined(__has_builtin)
#if __has_builtin(__builtin_clz)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned int)) {
return (size_t) __builtin_clz(a);
}
#endif
#if __has_builtin(__builtin_clzl)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned long)) {
return (size_t) __builtin_clzl(a);
}
#endif
#if __has_builtin(__builtin_clzll)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned long long)) {
return (size_t) __builtin_clzll(a);
}
#endif
#endif
size_t j;
mbedtls_mpi_uint mask = (mbedtls_mpi_uint) 1 << (biL - 1);
for (j = 0; j < biL; j++) {
if (a & mask) {
break;
}
mask >>= 1;
}
return j;
}
size_t mbedtls_mpi_core_bitlen(const mbedtls_mpi_uint *A, size_t A_limbs)
{
int i;

33
library/bignum_core.h
View file

@ -109,38 +109,7 @@
* \return The number of leading zero bits in \p a, if \p a != 0.
* If \p a == 0, the result is undefined.
*/
static inline size_t mbedtls_mpi_core_clz(mbedtls_mpi_uint a)
{
#if defined(__has_builtin)
#if __has_builtin(__builtin_clz)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned int)) {
return (size_t) __builtin_clz(a);
}
#endif
#if __has_builtin(__builtin_clzl)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned long)) {
return (size_t) __builtin_clzl(a);
}
#endif
#if __has_builtin(__builtin_clzll)
if (sizeof(mbedtls_mpi_uint) == sizeof(unsigned long long)) {
return (size_t) __builtin_clzll(a);
}
#endif
#endif
size_t j;
mbedtls_mpi_uint mask = (mbedtls_mpi_uint) 1 << (biL - 1);
for (j = 0; j < biL; j++) {
if (a & mask) {
break;
}
mask >>= 1;
}
return j;
}
size_t mbedtls_mpi_core_clz(mbedtls_mpi_uint a);
/** Return the minimum number of bits required to represent the value held
* in the MPI.