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Fix mpi_bigendian_to_host() on bigendian systems

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The previous implementation of mpi_bigendian_to_host() did
a byte-swapping regardless of the endianness of the system.

Fixes #2622.
This commit is contained in:
Hanno Becker 2019-05-01 17:09:11 +01:00
parent 1cd7bea2b1
commit 031d6335b7
1 changed files with 8 additions and 3 deletions
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11
library/bignum.c
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@ -742,10 +742,15 @@ cleanup:
static mbedtls_mpi_uint mpi_uint_bigendian_to_host_c( mbedtls_mpi_uint x )
{
uint8_t i;
unsigned char *x_ptr;
mbedtls_mpi_uint tmp = 0;
/* This works regardless of the endianness. */
for( i = 0; i < ciL; i++, x >>= 8 )
tmp |= ( x & 0xFF ) << ( ( ciL - 1 - i ) << 3 );
for( i = 0, x_ptr = (unsigned char*) &x; i < ciL; i++, x_ptr++ )
{
tmp <<= CHAR_BIT;
tmp |= (mbedtls_mpi_uint) *x_ptr;
}
return( tmp );
}