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[crypto] Add bigint_swap() to conditionally swap big integers

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Add a helper function bigint_swap() that can be used to conditionally
swap a pair of big integers in constant time.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-01-19 12:34:02 +00:00
parent 13e390d54e
commit bac13ba1f6
3 changed files with 94 additions and 0 deletions
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src/include/ipxe/bigint.h
+15
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@@ -189,6 +189,19 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
bigint_shrink ( (source), (dest) ); \
} while ( 0 )
/**
* Conditionally swap big integers (in constant time)
*
* @v first Big integer to be conditionally swapped
* @v second Big integer to be conditionally swapped
* @v swap Swap first and second big integers
*/
#define bigint_swap( first, second, swap ) do { \
unsigned int size = bigint_size (first); \
bigint_swap_raw ( (first)->element, (second)->element, size, \
(swap) ); \
} while ( 0 )
/**
* Multiply big integers
*
@@ -296,6 +309,8 @@ void bigint_grow_raw ( const bigint_element_t *source0,
void bigint_shrink_raw ( const bigint_element_t *source0,
unsigned int source_size, bigint_element_t *dest0,
unsigned int dest_size );
void bigint_swap_raw ( bigint_element_t *first0, bigint_element_t *second0,
unsigned int size, int swap );
void bigint_multiply_raw ( const bigint_element_t *multiplicand0,
unsigned int multiplicand_size,
const bigint_element_t *multiplier0,