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authorYegor Yefremov <yegorslists@googlemail.com>2016-05-25 09:51:13 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2016-05-25 10:41:30 +0200
commit61ddbd35207af8dbd9b1a0c17619148179235203 (patch)
tree5cabed596de7a799467f2571a610dd044adb1fd2 /crypto
parent57a648aabbb3e399cde3dcda749f8cb34b53b569 (diff)
downloadbarebox-61ddbd35207af8dbd9b1a0c17619148179235203.tar.gz
barebox-61ddbd35207af8dbd9b1a0c17619148179235203.tar.xz
crypto: add CRC32 digest
CRC32 digest can be used to check CRC32 hashes in FIT images etc. Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/Kconfig4
-rw-r--r--crypto/Makefile1
-rw-r--r--crypto/crc32_digest.c90
3 files changed, 95 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 9b347f872f..6d65c24d4f 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -36,6 +36,10 @@ config SHA512
config DIGEST_HMAC
bool
+config DIGEST_CRC32_GENERIC
+ bool "CRC32"
+ select CRC32
+
config DIGEST_MD5_GENERIC
bool "MD5"
select MD5
diff --git a/crypto/Makefile b/crypto/Makefile
index b4fb3d8da0..a7240d1d6e 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_CRC32) += crc32.o
obj-$(CONFIG_CRC16) += crc16.o
obj-$(CONFIG_CRC7) += crc7.o
obj-$(CONFIG_DIGEST) += digest.o
+obj-$(CONFIG_DIGEST_CRC32_GENERIC) += crc32_digest.o
obj-$(CONFIG_DIGEST_HMAC_GENERIC) += hmac.o
obj-$(CONFIG_DIGEST_MD5_GENERIC) += md5.o
obj-$(CONFIG_DIGEST_SHA1_GENERIC) += sha1.o
diff --git a/crypto/crc32_digest.c b/crypto/crc32_digest.c
new file mode 100644
index 0000000000..d322900fcb
--- /dev/null
+++ b/crypto/crc32_digest.c
@@ -0,0 +1,90 @@
+/*
+ * Cryptographic API.
+ *
+ * CRC32.
+ *
+ * Derived from cryptoapi implementation, adapted for in-place
+ * scatterlist interface.
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <common.h>
+#include <digest.h>
+#include <init.h>
+#include <linux/string.h>
+#include <crc.h>
+#include <asm/unaligned.h>
+#include <asm/byteorder.h>
+
+#include <crypto/crc.h>
+#include <crypto/internal.h>
+
+static int crc32_init(struct digest *desc)
+{
+ struct crc32_state *ctx = digest_ctx(desc);
+
+ ctx->crc = 0;
+
+ return 0;
+}
+
+static int crc32_update(struct digest *desc, const void *data,
+ unsigned long len)
+{
+ struct crc32_state *ctx = digest_ctx(desc);
+
+ while (len) {
+ int now = min((ulong)4096, len);
+ ctx->crc = crc32(ctx->crc, data, now);
+ len -= now;
+ data += now;
+ }
+
+ return 0;
+}
+
+static int crc32_final(struct digest *desc, unsigned char *md)
+{
+ struct crc32_state *ctx = digest_ctx(desc);
+ __be32 *dst = (__be32 *)md;
+
+ /* Store state in digest */
+ dst[0] = cpu_to_be32(ctx->crc);
+
+ /* Wipe context */
+ memset(ctx, 0, sizeof *ctx);
+
+ return 0;
+}
+
+static struct digest_algo m = {
+ .base = {
+ .name = "crc32",
+ .driver_name = "crc32-generic",
+ .priority = 0,
+ .algo = HASH_ALGO_CRC32,
+ },
+
+ .init = crc32_init,
+ .update = crc32_update,
+ .final = crc32_final,
+ .digest = digest_generic_digest,
+ .verify = digest_generic_verify,
+ .length = CRC32_DIGEST_SIZE,
+ .ctx_length = sizeof(struct crc32_state),
+};
+
+static int crc32_digest_register(void)
+{
+ return digest_algo_register(&m);
+}
+device_initcall(crc32_digest_register);