sha: reduce sha256/512 context size. Make sha1/sha256 code more similar

function                                             old     new   delta
sha512_end                                           182     204     +22
sha256_end                                           137     147     +10
sha1_hash                                            113     108      -5
sha1_end                                             143     129     -14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/2 up/down: 32/-19)             Total: 13 bytes

1 files changed, 3 insertions, 3 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 3f566f8af..b04488a54 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1322,7 +1322,7 @@ void bb_uuencode(char *store, const void *s, int length, const char *tbl) FAST_F
 
 typedef struct sha1_ctx_t {
         uint64_t total64;
-        uint32_t wbuffer[16]; /* NB: always correctly aligned for uint64_t */
+        uint8_t wbuffer[64]; /* NB: always correctly aligned for uint64_t */
         uint32_t hash[5];
 } sha1_ctx_t;
 void sha1_begin(sha1_ctx_t *ctx) FAST_FUNC;
@@ -1331,7 +1331,7 @@ void sha1_end(void *resbuf, sha1_ctx_t *ctx) FAST_FUNC;
 typedef struct sha256_ctx_t {
         uint64_t total64;
         uint32_t hash[8];
-        char wbuffer[64*2]; /* NB: always correctly aligned for uint64_t */
+        uint8_t wbuffer[64]; /* NB: always correctly aligned for uint64_t */
 } sha256_ctx_t;
 void sha256_begin(sha256_ctx_t *ctx) FAST_FUNC;
 void sha256_hash(const void *buffer, size_t len, sha256_ctx_t *ctx) FAST_FUNC;
@@ -1339,7 +1339,7 @@ void sha256_end(void *resbuf, sha256_ctx_t *ctx) FAST_FUNC;
 typedef struct sha512_ctx_t {
         uint64_t total64[2];
         uint64_t hash[8];
-        char wbuffer[128*2]; /* NB: always correctly aligned for uint64_t */
+        uint8_t wbuffer[128]; /* NB: always correctly aligned for uint64_t */
 } sha512_ctx_t;
 void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;
 void sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx) FAST_FUNC;