mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH] crypto: crc32: add big endian CRC implementation
Date: Thu,  9 Dec 2021 11:58:32 +0100	[thread overview]
Message-ID: <20211209105832.3518384-1-a.fatoum@pengutronix.de> (raw)

This implementation is a straight copy of the tableless
implementation inside Linux' lib/crc32.c

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 crypto/crc32.c | 12 ++++++++++++
 include/crc.h  |  1 +
 2 files changed, 13 insertions(+)

diff --git a/crypto/crc32.c b/crypto/crc32.c
index 232c023adb88..998cbc9de297 100644
--- a/crypto/crc32.c
+++ b/crypto/crc32.c
@@ -187,6 +187,18 @@ STATIC uint32_t crc32_no_comp(uint32_t crc, const void *_buf, unsigned int len)
     return crc;
 }
 
+STATIC uint32_t crc32_be(uint32_t crc, const void *_buf, unsigned int len)
+{
+	const unsigned char *buf = _buf;
+	int i;
+	while (len--) {
+		crc ^= *buf++ << 24;
+		for (i = 0; i < 8; i++)
+			crc = (crc << 1) ^ ((crc & 0x80000000) ? 0x04c11db7 : 0);
+	}
+	return crc;
+}
+
 STATIC int file_crc(char *filename, ulong start, ulong size, ulong *crc,
 		    ulong *total)
 {
diff --git a/include/crc.h b/include/crc.h
index eb972705c21a..a5204aaabb9c 100644
--- a/include/crc.h
+++ b/include/crc.h
@@ -36,6 +36,7 @@ static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
 #endif
 
 uint32_t crc32(uint32_t, const void *, unsigned int);
+uint32_t crc32_be(uint32_t, const void *, unsigned int);
 uint32_t crc32_no_comp(uint32_t, const void *, unsigned int);
 int file_crc(char *filename, unsigned long start, unsigned long size,
 	     unsigned long *crc, unsigned long *total);
-- 
2.30.2


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox


             reply	other threads:[~2021-12-09 11:00 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-09 10:58 Ahmad Fatoum [this message]
2021-12-13 22:17 ` Sascha Hauer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20211209105832.3518384-1-a.fatoum@pengutronix.de \
    --to=a.fatoum@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox