From cc0b6f18cdcce54a92961573b653e5f947d40651 Mon Sep 17 00:00:00 2001
From: Patrick Rudolph <siro@das-labor.org>
Date: Sun, 15 Dec 2019 18:03:36 +0100
Subject: lib/crc_byte: Add CRC32 implementation

* Add CRC32 using polynomial 0x04C11DB7
+ Add macro to caculate CRC of a buffer

Change-Id: If98e4e12bb53a6e5123e94e8cdffde1eb3bc4b4b
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37753
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/lib/crc_byte.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/lib/crc_byte.c')

diff --git a/src/lib/crc_byte.c b/src/lib/crc_byte.c
index 0ac006363a..c04449d13f 100644
--- a/src/lib/crc_byte.c
+++ b/src/lib/crc_byte.c
@@ -36,3 +36,17 @@ uint16_t crc16_byte(uint16_t prev_crc, uint8_t data)
 	prev_crc ^= ((prev_crc & 0xff) << 4) << 1;
 	return prev_crc;
 }
+
+uint32_t crc32_byte(uint32_t prev_crc, uint8_t data)
+{
+	prev_crc ^= (uint32_t)data << 24;
+
+	for (int i = 0; i < 8; i++) {
+		if ((prev_crc & 0x80000000UL) != 0)
+			prev_crc = ((prev_crc << 1) ^ 0x04C11DB7UL);
+		else
+			prev_crc <<= 1;
+	}
+
+	return prev_crc;
+}
-- 
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