--- coreutils/cksum.c
+++ coreutils/cksum.c
@@ -17,9 +17,18 @@
 //kbuild:lib-$(CONFIG_CKSUM) += cksum.o
 
 //usage:#define cksum_trivial_usage
-//usage:       "FILE..."
+//usage:       "[-l] [-p] FILE..."
 //usage:#define cksum_full_usage "\n\n"
 //usage:       "Calculate the CRC32 checksums of FILEs"
+//usage:       "\n      -l      least significant bit first"
+//usage:       "\n      -p      preset the CRC value to all ones"
+//usage:
+//usage:#define cksum_example_usage
+//usage:       "$ echo -n 'The quick brown fox jumps over the lazy dog' | cksum -lp\n"
+//usage:       "1095738169 43\n"
+//usage:       "$ echo -n 'The quick brown fox jumps over the lazy dog' | cksum\n"
+//usage:       "2074844392 43\n"
+
 
 #include "libbb.h"
 #include "common_bufsiz.h"
@@ -29,19 +38,28 @@
 int cksum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cksum_main(int argc UNUSED_PARAM, char **argv)
 {
-	uint32_t *crc32_table = crc32_filltable(NULL, 1);
-	uint32_t crc;
+	uint32_t crc = 0;
 	off_t length, filesize;
 	int bytes_read;
 	int exit_code = EXIT_SUCCESS;
+	int msbfirst = 1;
+	int initones = 0;
+	unsigned opt = 0;
+	uint32_t *crc32_table = NULL;
+	uint32_t (*crc_func)(uint32_t, const void *, unsigned, uint32_t *);
 
-#if ENABLE_DESKTOP
-	getopt32(argv, ""); /* coreutils 6.9 compat */
+	opt = getopt32(argv, "lp");
 	argv += optind;
-#else
-	argv++;
-#endif
+	if (opt & 1) {
+		msbfirst = 0;
+		crc_func = &crc32_block_endian0;
+	} else {
+		crc_func = &crc32_block_endian1;
+	}
+	if (opt & 2)
+		initones = 1;
 
+	crc32_table = crc32_filltable(NULL, msbfirst);
 	setup_common_bufsiz();
 	do {
 		int fd = open_or_warn_stdin(*argv ? *argv : bb_msg_standard_input);
@@ -50,19 +68,19 @@
 			exit_code = EXIT_FAILURE;
 			continue;
 		}
-		crc = 0;
+		crc = initones ? 0xFFFFFFFF : 0;
 		length = 0;
 
 #define read_buf bb_common_bufsiz1
 		while ((bytes_read = safe_read(fd, read_buf, COMMON_BUFSIZE)) > 0) {
 			length += bytes_read;
-			crc = crc32_block_endian1(crc, read_buf, bytes_read, crc32_table);
+			crc = (*crc_func)(crc, read_buf, bytes_read, crc32_table);
 		}
 		close(fd);
 
 		filesize = length;
 
-		while (length) {
+		while (msbfirst && length) {
 			crc = (crc << 8) ^ crc32_table[(uint8_t)(crc >> 24) ^ (uint8_t)length];
 			/* must ensure that shift is unsigned! */
 			if (sizeof(length) <= sizeof(unsigned))