From 08c0a1ca2d7a4a0bf9e27dbaff409a3ffb9d2360 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Fri, 4 Dec 2009 14:54:57 +0000
Subject: [PATCH] Remove CRC32_SHIFT4 code as we are unlikely to ever need it

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23445 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/lib/crypto/crypto_tests/t_crc.c | 15 ---------------
 src/lib/crypto/krb/crc32/crc-32.h   |  6 ------
 src/lib/crypto/krb/crc32/crc32.c    | 26 --------------------------
 3 files changed, 47 deletions(-)

diff --git a/src/lib/crypto/crypto_tests/t_crc.c b/src/lib/crypto/crypto_tests/t_crc.c
index 69a646805..99b2b5ee7 100644
--- a/src/lib/crypto/crypto_tests/t_crc.c
+++ b/src/lib/crypto/crypto_tests/t_crc.c
@@ -134,21 +134,6 @@ timetest(unsigned int nblk, unsigned int blksiz)
            (long)(after.tms_cutime - before.tms_cutime),
            (long)(after.tms_cstime - before.tms_cstime));
 
-#ifdef CRC32_SHIFT4
-    times(&before);
-    for (i = 0; i < nblk; i++) {
-        cksum = 0;
-        mit_crc32_shift4(block + i * blksiz, blksiz, &cksum);
-    }
-    times(&after);
-    printf("shift-4 implementation, %d blocks of %d bytes:\n",
-           nblk, blksiz);
-    printf("\tu=%ld s=%ld cu=%ld cs=%ld\n",
-           (long)(after.tms_utime - before.tms_utime),
-           (long)(after.tms_stime - before.tms_stime),
-           (long)(after.tms_cutime - before.tms_cutime),
-           (long)(after.tms_cstime - before.tms_cstime));
-#endif
     free(block);
 }
 
diff --git a/src/lib/crypto/krb/crc32/crc-32.h b/src/lib/crypto/krb/crc32/crc-32.h
index 5c28b8b79..08fce6dc7 100644
--- a/src/lib/crypto/krb/crc32/crc-32.h
+++ b/src/lib/crypto/krb/crc32/crc-32.h
@@ -64,10 +64,4 @@
 void
 mit_crc32 (krb5_pointer in, size_t in_length, unsigned long *c);
 
-#ifdef CRC32_SHIFT4
-void mit_crc32_shift4(krb5_pointer /* in */,
-                      size_t /* in_length */,
-                      unsigned long * /* cksum */);
-#endif
-
 #endif /* KRB5_CRC32__ */
diff --git a/src/lib/crypto/krb/crc32/crc32.c b/src/lib/crypto/krb/crc32/crc32.c
index ef364f3ed..659e61199 100644
--- a/src/lib/crypto/krb/crc32/crc32.c
+++ b/src/lib/crypto/krb/crc32/crc32.c
@@ -165,29 +165,3 @@ mit_crc32(krb5_pointer in, size_t in_length, unsigned long *cksum)
 
     *cksum = c;
 }
-
-#ifdef CRC32_SHIFT4
-static unsigned long const tbl4[16] = {
-    0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
-    0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
-    0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
-    0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
-};
-
-void
-mit_crc32_shift4(krb5_pointer in, size_t in_length, unsigned long *cksum)
-{
-    register unsigned char *data, b;
-    register unsigned long c = *cksum;
-    size_t i;
-
-    data = (u_char *)in;
-    for (i = 0; i < in_length; i++) {
-        b = data[i];
-        c = (c >> 4) ^ tbl4[(b ^ c) & 0x0f];
-        b >>= 4;
-        c = (c >> 4) ^ tbl4[(b ^ c) & 0x0f];
-    }
-    *cksum = c;
-}
-#endif
-- 
2.26.2