RTEMS | cpukit/libcrypt: Add SHA3-512 Keccak Implementation (!687)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton commented on a discussion on cpukit/include/crypt.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/687#note_129847

 > +	unsigned int rate;
 > +	unsigned int capacity;
 > +	unsigned int pos;
 > +} sha3_ctx_t;
 > +
 > +void sha3_init(sha3_ctx_t *ctx);
 > +void sha3_update(sha3_ctx_t *ctx, const void *data, size_t len);
 > +void sha3_final(sha3_ctx_t *ctx, uint8_t *out, size_t outlen);
 > +
 > +void _crypt_to64(char *s, unsigned long v, int n);
 > +
 > +/* Dirty hack to re-introduce the C11 memset_s function
 > +*  which is missing from the RTEMS C11 compiler but which
 > +*  is used in the libcrypt functions to securely erase
 > +*  sensitive data after use. 
 > +*/

The term "dirty hack" was perhaps misplaced for usage here. I have amended and cleaned up the comment for clarity.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/687#note_129847
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