sha: merge sha1/sha256 handling (they are similar enough for this),

 shrink sha215 code

function                                             old     new   delta
sha1_end                                             129     142     +13
sha1_process_block64                                 486     494      +8
sha256_begin                                          37      44      +7
sha1_begin                                            49      56      +7
sha1_hash                                            108     112      +4
...
sha512_end                                           204     184     -20
sha512_process_block128                             1405    1334     -71
sha256_process_block64                               520     446     -74
sha256_end                                           147       -    -147
sha512_hash                                          297     130    -167
sha256_hash                                          260       -    -260
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 11/9 up/down: 59/-752)         Total: -693 bytes

1 files changed, 6 insertions, 9 deletions

diff --git a/include/libbb.h b/include/libbb.h
index b04488a54..b6eab6f24 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1321,24 +1321,21 @@ extern const char bb_uuenc_tbl_std[];
 void bb_uuencode(char *store, const void *s, int length, const char *tbl) FAST_FUNC;
 
 typedef struct sha1_ctx_t {
+        uint32_t hash[8];    /* 5, +3 elements for sha256 */
         uint64_t total64;
         uint8_t wbuffer[64]; /* NB: always correctly aligned for uint64_t */
-        uint32_t hash[5];
+        void (*process_block)(struct sha1_ctx_t*);
 } sha1_ctx_t;
 void sha1_begin(sha1_ctx_t *ctx) FAST_FUNC;
 void sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx) FAST_FUNC;
 void sha1_end(void *resbuf, sha1_ctx_t *ctx) FAST_FUNC;
-typedef struct sha256_ctx_t {
-        uint64_t total64;
-        uint32_t hash[8];
-        uint8_t wbuffer[64]; /* NB: always correctly aligned for uint64_t */
-} sha256_ctx_t;
+typedef struct sha1_ctx_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;
-void sha256_end(void *resbuf, sha256_ctx_t *ctx) FAST_FUNC;
+#define sha256_hash sha1_hash
+#define sha256_end sha1_end
 typedef struct sha512_ctx_t {
-        uint64_t total64[2];
         uint64_t hash[8];
+        uint64_t total64[2];
         uint8_t wbuffer[128]; /* NB: always correctly aligned for uint64_t */
 } sha512_ctx_t;
 void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;