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| author | Michael Brown | 2015-07-25 15:41:30 +0200 |
|---|---|---|
| committer | Michael Brown | 2015-07-27 16:21:17 +0200 |
| commit | 775f5943c0aa8b9889aed057bf0057c62f06c253 (patch) | |
| tree | 43239e83940640f8106550675447d99e8b4c42e6 /src/include/ipxe | |
| parent | [build] Fix compiler warnings on some gcc versions (diff) | |
| download | ipxe-775f5943c0aa8b9889aed057bf0057c62f06c253.tar.gz ipxe-775f5943c0aa8b9889aed057bf0057c62f06c253.tar.xz ipxe-775f5943c0aa8b9889aed057bf0057c62f06c253.zip | |
[crypto] Add bit-rotation functions for 8-bit and 16-bit values
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include/ipxe')
| -rw-r--r-- | src/include/ipxe/rotate.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/include/ipxe/rotate.h b/src/include/ipxe/rotate.h index 3495040bc..b5693e3ca 100644 --- a/src/include/ipxe/rotate.h +++ b/src/include/ipxe/rotate.h @@ -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 ) ) ); |