md5sum: code shrink

For CONFIG_MD5_SMALL=1:
function                                             old     new   delta
md5_process_block64                                  925     881     -44

For CONFIG_MD5_SMALL=0:
function                                             old     new   delta
md5_process_block64                                 1603    1586     -17

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 6 insertions, 10 deletions

diff --git a/libbb/hash_md5_sha.c b/libbb/hash_md5_sha.c
index 1f63ccdee..d08c6b2f7 100644
--- a/libbb/hash_md5_sha.c
+++ b/libbb/hash_md5_sha.c
@@ -137,7 +137,7 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
 #if MD5_SMALL > 0
         /* Before we start, one word to the strange constants.
            They are defined in RFC 1321 as
-           T[i] = (int)(4294967296.0 * fabs(sin(i))), i=1..64
+           T[i] = (int)(2^32 * fabs(sin(i))), i=1..64
          */
         static const uint32_t C_array[] = {
                 /* round 1 */
@@ -213,7 +213,7 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
                 case 2:
                         temp += FH(B, C, D);
                         break;
-                case 3:
+                default: /* case 3 */
                         temp += FI(B, C, D);
                 }
                 temp += words[(int) (*pp++)] + *pc++;
@@ -277,10 +277,6 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
 
 #else  /* MD5_SMALL == 0 or 1 */
 
-        uint32_t A_save = A;
-        uint32_t B_save = B;
-        uint32_t C_save = C;
-        uint32_t D_save = D;
 # if MD5_SMALL == 1
         const uint32_t *pc;
         const char *pp;
@@ -425,10 +421,10 @@ static void FAST_FUNC md5_process_block64(md5_ctx_t *ctx)
 # undef OP
 # endif
         /* Add checksum to the starting values */
-        ctx->hash[0] = A_save + A;
-        ctx->hash[1] = B_save + B;
-        ctx->hash[2] = C_save + C;
-        ctx->hash[3] = D_save + D;
+        ctx->hash[0] += A;
+        ctx->hash[1] += B;
+        ctx->hash[2] += C;
+        ctx->hash[3] += D;
 #endif
 }
 #undef FF