From: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
CRC32 digest can be used to check CRC32 hashes in FIT images etc.
Signed-off-by: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
---
crypto/Kconfig | 4 +++
crypto/Makefile | 1 +
crypto/crc32_digest.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/crypto/crc.h | 16 +++++++++
include/digest.h | 1 +
5 files changed, 112 insertions(+)
create mode 100644 crypto/crc32_digest.c
create mode 100644 include/crypto/crc.h
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 9b347f8..6d65c24 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 b4fb3d8..a7240d1 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 0000000..d322900
--- /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@xxxxxxxxxxxxxxx>
+ * Copyright (c) Jean-Francois Dive <jef@xxxxxxxxxxx>
+ *
+ * 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);
diff --git a/include/crypto/crc.h b/include/crypto/crc.h
new file mode 100644
index 0000000..6428634
--- /dev/null
+++ b/include/crypto/crc.h
@@ -0,0 +1,16 @@
+/*
+ * Common values for CRC algorithms
+ */
+
+#ifndef _CRYPTO_CRC_H
+#define _CRYPTO_CRC_H
+
+#include <linux/types.h>
+
+#define CRC32_DIGEST_SIZE 4
+
+struct crc32_state {
+ ulong crc;
+};
+
+#endif
diff --git a/include/digest.h b/include/digest.h
index fe30cc2..4552e58 100644
--- a/include/digest.h
+++ b/include/digest.h
@@ -41,6 +41,7 @@ enum hash_algo {
HASH_ALGO_TGR_128,
HASH_ALGO_TGR_160,
HASH_ALGO_TGR_192,
+ HASH_ALGO_CRC32,
HASH_ALGO__LAST
};
--
2.1.4
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