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[crypto] Add bit-rotation functions for 8-bit and 16-bit values 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2015-07-25 14:41:30 +01:00
parent 99d351605a
commit 775f5943c0
1 changed files with 20 additions and 0 deletions
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20
src/include/ipxe/rotate.h
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@ -10,6 +10,26 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
static inline __attribute__ (( always_inline )) uint8_t
rol8 ( uint8_t data, unsigned int rotation ) {
return ( ( data << rotation ) | ( data >> ( 8 - rotation ) ) );
}
static inline __attribute__ (( always_inline )) uint8_t
ror8 ( uint8_t data, unsigned int rotation ) {
return ( ( data >> rotation ) | ( data << ( 8 - rotation ) ) );
}
static inline __attribute__ (( always_inline )) uint16_t
rol16 ( uint16_t data, unsigned int rotation ) {
return ( ( data << rotation ) | ( data >> ( 16 - rotation ) ) );
}
static inline __attribute__ (( always_inline )) uint16_t
ror16 ( uint16_t data, unsigned int rotation ) {
return ( ( data >> rotation ) | ( data << ( 16 - rotation ) ) );
}
static inline __attribute__ (( always_inline )) uint32_t
rol32 ( uint32_t data, unsigned int rotation ) {
return ( ( data << rotation ) | ( data >> ( 32 - rotation ) ) );