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[crypto] Allow multiplicand and multiplier to differ in size

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Big integer multiplication is currently used only as part of modular
exponentiation, where both multiplicand and multiplier will be the
same size.

Relax this requirement to allow for the use of big integer
multiplication in other contexts.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-01-16 16:09:16 +00:00
parent 4b7d9a6af0
commit 26d3ef062b
10 changed files with 103 additions and 68 deletions
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12
src/include/ipxe/bigint.h
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@@ -184,10 +184,11 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
* @v result Big integer to hold result
*/
#define bigint_multiply( multiplicand, multiplier, result ) do { \
unsigned int size = bigint_size (multiplicand); \
unsigned int multiplicand_size = bigint_size (multiplicand); \
unsigned int multiplier_size = bigint_size (multiplier); \
bigint_multiply_raw ( (multiplicand)->element, \
(multiplier)->element, (result)->element, \
size ); \
multiplicand_size, (multiplier)->element, \
multiplier_size, (result)->element ); \
} while ( 0 )
/**
@@ -283,9 +284,10 @@ void bigint_shrink_raw ( const bigint_element_t *source0,
unsigned int source_size, bigint_element_t *dest0,
unsigned int dest_size );
void bigint_multiply_raw ( const bigint_element_t *multiplicand0,
unsigned int multiplicand_size,
const bigint_element_t *multiplier0,
bigint_element_t *result0,
unsigned int size );
unsigned int multiplier_size,
bigint_element_t *result0 );
void bigint_mod_multiply_raw ( const bigint_element_t *multiplicand0,
const bigint_element_t *multiplier0,
const bigint_element_t *modulus0,