sha256/512: code shrink. Run-tested.

function                                             old     new   delta
sha512_process_block128                                -    1444   +1444
sha1_process_block64                                   -     542    +542
sha256_process_block64                                 -     529    +529
K512_lo                                                -     320    +320
K256                                                   -     320    +320
init512_lo                                             -      32     +32
init256                                                -      32     +32
sha1_hash                                             99     128     +29
sha256_end                                           160     135     -25
sha1_end                                             189     160     -29
sha512_end                                           237     204     -33
sha256_begin                                          77      44     -33
sha512_begin                                         154      88     -66
sha256_hash                                          338     259     -79
sha512_hash                                          358     262     -96
sha1_compile                                         542       -    -542
sha256_process_block                                 594       -    -594
static.K                                             896       -    -896
sha512_process_block                                1861       -   -1861
------------------------------------------------------------------------------
(add/remove: 7/4 grow/shrink: 1/7 up/down: 3248/-4254)      Total: -1006 bytes
   text    data     bss     dec     hex filename
 808013     468    7856  816337   c74d1 busybox_old
 807007     468    7856  815331   c70e3 busybox_unstripped

1 files changed, 8 insertions, 8 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 80a1c91..4c99010 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1321,27 +1321,27 @@ 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 count[2];
+	uint64_t total64;
+	uint32_t wbuffer[16]; /* NB: always correctly aligned for uint64_t */
 	uint32_t hash[5];
-	uint32_t wbuf[16];
 } 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 {
+	unsigned wbuflen;
 	uint32_t H[8];
-	uint32_t total[2]; /* rename to "count"? */
-	uint32_t buflen;
-	char buffer[128]; /* NB: always correctly aligned for uint32_t */
+	uint64_t total64;
+	char wbuffer[64*2]; /* 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;
 void sha256_end(void *resbuf, sha256_ctx_t *ctx) FAST_FUNC;
 typedef struct sha512_ctx_t {
+	unsigned wbuflen;
 	uint64_t H[8];
-	uint64_t total[2];
-	uint64_t buflen;
-	char buffer[256]; /* NB: always correctly aligned for uint64_t */
+	uint64_t total64[2];
+	char wbuffer[128*2]; /* 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;