eden-emu/mbedtls
15
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Reorder functions in bignum_core.[ch]

Browse source 
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove 2022-08-30 11:57:22 +01:00
parent d932de8857
commit b496486cdc
2 changed files with 163 additions and 163 deletions
Download patch file Download diff file Expand all files Collapse all files

166
library/bignum_core.c
View file

@ -293,6 +293,89 @@ int mbedtls_mpi_core_write_be( const mbedtls_mpi_uint *X,
return( 0 );
}
mbedtls_mpi_uint mbedtls_mpi_core_add_if( mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
size_t limbs,
unsigned cond )
{
mbedtls_mpi_uint c = 0, t;
for( size_t i = 0; i < limbs; i++ )
{
mbedtls_mpi_uint add = cond * B[i];
t = c;
t += A[i]; c = ( t < A[i] );
t += add; c += ( t < add );
A[i] = t;
}
return( c );
}
mbedtls_mpi_uint mbedtls_mpi_core_sub( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
size_t limbs )
{
mbedtls_mpi_uint c = 0;
for( size_t i = 0; i < limbs; i++ )
{
mbedtls_mpi_uint z = ( A[i] < c );
mbedtls_mpi_uint t = A[i] - c;
c = ( t < B[i] ) + z;
X[i] = t - B[i];
}
return( c );
}
mbedtls_mpi_uint mbedtls_mpi_core_mla( mbedtls_mpi_uint *d, size_t d_len,
const mbedtls_mpi_uint *s, size_t s_len,
mbedtls_mpi_uint b )
{
mbedtls_mpi_uint c = 0; /* carry */
if( d_len < s_len )
s_len = d_len;
size_t excess_len = d_len - s_len;
size_t steps_x8 = s_len / 8;
size_t steps_x1 = s_len & 7;
while( steps_x8-- )
{
MULADDC_X8_INIT
MULADDC_X8_CORE
MULADDC_X8_STOP
}
while( steps_x1-- )
{
MULADDC_X1_INIT
MULADDC_X1_CORE
MULADDC_X1_STOP
}
while( excess_len-- )
{
*d += c; c = ( *d < c ); d++;
}
return( c );
}
/*
* Fast Montgomery initialization (thanks to Tom St Denis).
*/
mbedtls_mpi_uint mbedtls_mpi_montg_init( const mbedtls_mpi_uint *N )
{
mbedtls_mpi_uint x = N[0];
x += ( ( N[0] + 2 ) & 4 ) << 1;
for( unsigned int i = biL; i >= 8; i /= 2 )
x *= ( 2 - ( N[0] * x ) );
return( ~x + 1 );
}
void mbedtls_mpi_core_montmul( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
@ -345,87 +428,4 @@ void mbedtls_mpi_core_montmul( mbedtls_mpi_uint *X,
mbedtls_ct_mpi_uint_cond_assign( AN_limbs, X, T, (unsigned char) ( carry ^ borrow ) );
}
/*
* Fast Montgomery initialization (thanks to Tom St Denis).
*/
mbedtls_mpi_uint mbedtls_mpi_montg_init( const mbedtls_mpi_uint *N )
{
mbedtls_mpi_uint x = N[0];
x += ( ( N[0] + 2 ) & 4 ) << 1;
for( unsigned int i = biL; i >= 8; i /= 2 )
x *= ( 2 - ( N[0] * x ) );
return( ~x + 1 );
}
mbedtls_mpi_uint mbedtls_mpi_core_mla( mbedtls_mpi_uint *d, size_t d_len,
const mbedtls_mpi_uint *s, size_t s_len,
mbedtls_mpi_uint b )
{
mbedtls_mpi_uint c = 0; /* carry */
if( d_len < s_len )
s_len = d_len;
size_t excess_len = d_len - s_len;
size_t steps_x8 = s_len / 8;
size_t steps_x1 = s_len & 7;
while( steps_x8-- )
{
MULADDC_X8_INIT
MULADDC_X8_CORE
MULADDC_X8_STOP
}
while( steps_x1-- )
{
MULADDC_X1_INIT
MULADDC_X1_CORE
MULADDC_X1_STOP
}
while( excess_len-- )
{
*d += c; c = ( *d < c ); d++;
}
return( c );
}
mbedtls_mpi_uint mbedtls_mpi_core_sub( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
size_t limbs )
{
mbedtls_mpi_uint c = 0;
for( size_t i = 0; i < limbs; i++ )
{
mbedtls_mpi_uint z = ( A[i] < c );
mbedtls_mpi_uint t = A[i] - c;
c = ( t < B[i] ) + z;
X[i] = t - B[i];
}
return( c );
}
mbedtls_mpi_uint mbedtls_mpi_core_add_if( mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,
size_t limbs,
unsigned cond )
{
mbedtls_mpi_uint c = 0, t;
for( size_t i = 0; i < limbs; i++ )
{
mbedtls_mpi_uint add = cond * B[i];
t = c;
t += A[i]; c = ( t < A[i] );
t += add; c += ( t < add );
A[i] = t;
}
return( c );
}
#endif /* MBEDTLS_BIGNUM_C */