libbb: eliminate redundant variable in sha_crypt

function                                             old     new   delta
sha_crypt                                           1136    1130      -6

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

diff --git a/libbb/pw_encrypt_sha.c b/libbb/pw_encrypt_sha.c
index 8aeaacad6ad51489e47d1221c83895bb2192b45c..72e37e485033c78d14b65b03523a101fcedf5d42 100644 (file)
--- a/libbb/pw_encrypt_sha.c
+++ b/libbb/pw_encrypt_sha.c
@@ -47,16 +47,17 @@ sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
        unsigned cnt;
        unsigned rounds;
        char *cp;
-       char is_sha512;
 
        /* Analyze salt, construct already known part of result */
        cnt = strlen(salt_data) + 1 + 43 + 1;
-       is_sha512 = salt_data[1];
-       if (is_sha512 == '6')
+       _32or64 = 32;
+       if (salt_data[1] == '6') { /* sha512 */
+               _32or64 *= 2; /*64*/
                cnt += 43;
+       }
        result = resptr = xzalloc(cnt); /* will provide NUL terminator */
        *resptr++ = '$';
-       *resptr++ = is_sha512;
+       *resptr++ = salt_data[1];
        *resptr++ = '$';
        rounds = ROUNDS_DEFAULT;
        salt_data += 3;
@@ -93,12 +94,10 @@ sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
        sha_begin = (void*)sha256_begin;
        sha_hash = (void*)sha256_hash;
        sha_end = (void*)sha256_end;
-       _32or64 = 32;
-       if (is_sha512 == '6') {
+       if (_32or64 != 32) {
                sha_begin = (void*)sha512_begin;
                sha_hash = (void*)sha512_hash;
                sha_end = (void*)sha512_end;
-               _32or64 = 64;
        }
 
        /* Add KEY, SALT.  */
@@ -200,7 +199,7 @@ do { \
        unsigned w = ((B2) << 16) | ((B1) << 8) | (B0); \
        resptr = to64(resptr, w, N); \
 } while (0)
-       if (is_sha512 == '5') {
+       if (_32or64 == 32) { /* sha256 */
                unsigned i = 0;
                while (1) {
                        unsigned j = i + 10;