[crypto] Use standard bit-rotation functions

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/crypto/md5.c

 #include <string.h>
 #include <byteswap.h>
 #include <assert.h>
+#include <ipxe/rotate.h>
 #include <ipxe/crypto.h>
 #include <ipxe/md5.h>
 
-/**
- * Rotate dword left
- *
- * @v dword		Dword
- * @v rotate		Amount of rotation
- */
-static inline __attribute__ (( always_inline )) uint32_t
-rol32 ( uint32_t dword, unsigned int rotate ) {
-	return ( ( dword << rotate ) | ( dword >> ( 32 - rotate ) ) );
-}
-
 /** MD5 variables */
 struct md5_variables {
 	/* This layout matches that of struct md5_digest_data,

src/crypto/sha1.c

 #include <string.h>
 #include <byteswap.h>
 #include <assert.h>
+#include <ipxe/rotate.h>
 #include <ipxe/crypto.h>
 #include <ipxe/sha1.h>
 
-/**
- * Rotate dword left
- *
- * @v dword		Dword
- * @v rotate		Amount of rotation
- */
-static inline __attribute__ (( always_inline )) uint32_t
-rol32 ( uint32_t dword, unsigned int rotate ) {
-	return ( ( dword << rotate ) | ( dword >> ( 32 - rotate ) ) );
-}
-
 /** SHA-1 variables */
 struct sha1_variables {
 	/* This layout matches that of struct sha1_digest_data,

src/crypto/sha256.c

 #include <string.h>
 #include <byteswap.h>
 #include <assert.h>
+#include <ipxe/rotate.h>
 #include <ipxe/crypto.h>
 #include <ipxe/sha256.h>
 
-/**
- * Rotate dword right
- *
- * @v dword		Dword
- * @v rotate		Amount of rotation
- */
-static inline __attribute__ (( always_inline )) uint32_t
-ror32 ( uint32_t dword, unsigned int rotate ) {
-	return ( ( dword >> rotate ) | ( dword << ( 32 - rotate ) ) );
-}
-
 /** SHA-256 variables */
 struct sha256_variables {
 	/* This layout matches that of struct sha256_digest_data,

src/include/ipxe/rotate.h

 
 #include <stdint.h>
 
-static inline uint32_t rol32 ( uint32_t data, unsigned int rotation ) {
+static inline __attribute__ (( always_inline )) uint32_t
+rol32 ( uint32_t data, unsigned int rotation ) {
         return ( ( data << rotation ) | ( data >> ( 32 - rotation ) ) );
 }
 
-static inline uint32_t ror32 ( uint32_t data, unsigned int rotation ) {
+static inline __attribute__ (( always_inline )) uint32_t
+ror32 ( uint32_t data, unsigned int rotation ) {
         return ( ( data >> rotation ) | ( data << ( 32 - rotation ) ) );
 }
 
-static inline uint64_t rol64 ( uint64_t data, unsigned int rotation ) {
+static inline __attribute__ (( always_inline )) uint64_t
+rol64 ( uint64_t data, unsigned int rotation ) {
         return ( ( data << rotation ) | ( data >> ( 64 - rotation ) ) );
 }
 
-static inline uint64_t ror64 ( uint64_t data, unsigned int rotation ) {
+static inline __attribute__ (( always_inline )) uint64_t
+ror64 ( uint64_t data, unsigned int rotation ) {
         return ( ( data >> rotation ) | ( data << ( 64 - rotation ) ) );
 }