diff -Nabur zip30/crc32.c zip304/crc32.c
--- zip30/crc32.c	2008-05-05 00:51:40.000000000 +0800
+++ zip304/crc32.c	2021-05-11 19:15:43.071275962 +0800
@@ -675,7 +675,32 @@
 
 #endif /* (IZ_CRC_BE_OPTIMIZ || IZ_CRC_LE_OPTIMIZ) */
 
+#ifdef ARCH_AARCH64
+u_int32_t crc32(u_int32_t crc,const u_int8_t *p, unsigned int len)
+{
+int64_t length = len;
+
+while ((length -= sizeof(u_int64_t)) >=0) {
+        __builtin_aarch64_crc32cx(crc, *((u_int64_t *)p));
+        p += sizeof(u_int64_t);
+}
+
+if (length & sizeof(u_int32_t)) {
+        __builtin_aarch64_crc32cw(crc, *((u_int32_t *)p));
+        p += sizeof(u_int32_t);
+}
 
+if (length & sizeof(u_int16_t)) {
+        __builtin_aarch64_crc32ch(crc, *((u_int16_t *)p));
+        p += sizeof(u_int16_t);
+}
+
+if (length & sizeof(u_int8_t))
+        __builtin_aarch64_crc32cb(crc, *p);
+
+return crc;
+}
+#else
 /* ========================================================================= */
 ulg crc32(crc, buf, len)
     ulg crc;                    /* crc shift register */
@@ -726,6 +751,8 @@
 
   return REV_BE(c) ^ 0xffffffffL;   /* (instead of ~c for 64-bit machines) */
 }
+#endif /* !ARCH_AARCH64*/
+
 #endif /* !ASM_CRC */
 #endif /* !CRC_TABLE_ONLY */
 #endif /* !USE_ZLIB */
diff -Nabur zip30/crc32.h zip304/crc32.h
--- zip30/crc32.h	2008-03-28 20:25:46.000000000 +0800
+++ zip304/crc32.h	2021-05-11 19:17:36.765057779 +0800
@@ -36,7 +36,11 @@
 #    undef IZ_CRC_BE_OPTIMIZ
 #  endif
 #else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
+#  ifdef ARCH_AARCH64
+  u_int32_t crc32(u_int32_t crc,const u_int8_t *p, unsigned int len);
+#  else
    ulg      crc32           OF((ulg crc, ZCONST uch *buf, extent len));
+#  endif
 #endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */
 
 #ifndef CRC_32_TAB
diff -Nabur zip30/unix/Makefile zip304/unix/Makefile
--- zip30/unix/Makefile	2008-05-07 14:33:56.000000000 +0800
+++ zip304/unix/Makefile	2021-05-11 19:15:55.727474311 +0800
@@ -37,6 +37,9 @@
 BINFLAGS = 755
 MANFLAGS = 644
 
+
+TARGET_ARCH = $(shell uname -m)
+ARCH = $(shell getconf LONG_BIT)
 # target directories - where to install executables and man pages to
 prefix = /usr/local
 BINDIR = $(prefix)/bin
@@ -59,6 +62,12 @@
 #   LFLAGS2   flags after obj file list (libraries, etc)
 CFLAGS_NOOPT = -I. -DUNIX $(LOCAL_ZIP)
 CFLAGS = -O2 $(CFLAGS_NOOPT)
+ifeq ($(TARGET_ARCH),aarch64)
+CFF = -DARCH=$(ARCH) -march=armv8.1-a -D ARCH_AARCH64
+else
+CFF =
+endif
+
 LFLAGS1 =
 LFLAGS2 = -s
 
@@ -80,10 +89,10 @@
 .SUFFIXES:
 .SUFFIXES: _.o .o .c .doc .1
 .c_.o:
-	$(CC) -c $(CFLAGS) -DUTIL -o $@ $<
+	$(CC) -c $(CFLAGS) -DUTIL $(CFF)  -o $@ $<
 
 .c.o:
-	$(CC) -c $(CFLAGS) $<
+	$(CC) -c $(CFLAGS) $(CFF) $<
 
 .1.doc:
 	nroff -man $< | col -bx | uniq > $@