btrfs-progs/tests/sha-private.h
David Sterba 4ddd6055c3 btrfs-progs: tests: add SHA256
In order to drop dependency on SSL library to compute MD5 in fssum,
we'll use the reference implementation from RFC 6234.

The checksum is not in a cryptographically sensitive context, but we're
going to skip MD5 and SHA-1 anyway.

Signed-off-by: David Sterba <dsterba@suse.com>
2017-03-16 17:02:44 +01:00

29 lines
889 B
C

/************************ sha-private.h ************************/
/***************** See RFC 6234 for details. *******************/
#ifndef _SHA_PRIVATE__H
#define _SHA_PRIVATE__H
/*
* These definitions are defined in FIPS 180-3, section 4.1.
* Ch() and Maj() are defined identically in sections 4.1.1,
* 4.1.2, and 4.1.3.
*
* The definitions used in FIPS 180-3 are as follows:
*/
#ifndef USE_MODIFIED_MACROS
#define SHA_Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
#define SHA_Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#else /* USE_MODIFIED_MACROS */
/*
* The following definitions are equivalent and potentially faster.
*/
#define SHA_Ch(x, y, z) (((x) & ((y) ^ (z))) ^ (z))
#define SHA_Maj(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
#endif /* USE_MODIFIED_MACROS */
#define SHA_Parity(x, y, z) ((x) ^ (y) ^ (z))
#endif /* _SHA_PRIVATE__H */