keystore: add imx6 caam based keystore implementation

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

3 files changed, 105 insertions, 22 deletions

diff --git a/Makefile.am b/Makefile.am
index 9e45325..28a8bef 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,7 +49,7 @@ barebox_state_SOURCES = \
 	src/crypto/hmac.c \
 	src/crypto/sha1.c \
 	src/crypto/sha2.c \
-	src/keystore.c \
+	src/keystore-blob.c \
 	src/base64.c \
 	src/barebox-state.c \
 	\
diff --git a/src/keystore-blob.c b/src/keystore-blob.c
new file mode 100644
index 0000000..032adb6
--- /dev/null
+++ b/src/keystore-blob.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+
+#include <common.h>
+#include <barebox-state.h>
+#include <keystore.h>
+#include <base64.h>
+
+static const char keystore_state_name[] = "/blobs";
+static const char blob_gen_payload[] = "/sys/devices/soc0/soc/2100000.aips-bus/2100000.caam/blob_gen/payload";
+static const char blob_gen_modifier[] = "/sys/devices/soc0/soc/2100000.aips-bus/2100000.caam/blob_gen/modifier";
+static const char blob_gen_blob[] = "/sys/devices/soc0/soc/2100000.aips-bus/2100000.caam/blob_gen/blob";
+
+static struct state *state;
+
+int keystore_get_secret(const char *name, const unsigned char **key, int *key_len)
+{
+	FILE *fp;
+	char *blob, *modifier, *payload;
+	u8 *blob_bin, *payload_bin;
+	ssize_t len;
+	int fd, ret;
+
+	if (!state) {
+		struct state *tmp;
+
+		tmp = state_get(keystore_state_name);
+		if (IS_ERR(tmp))
+			return  PTR_ERR(tmp);
+		state = tmp;
+	}
+
+	/* modifier */
+	fp = fopen(blob_gen_modifier, "w");
+	if (!fp)
+		return -errno;
+
+	ret = fprintf(fp, "user:%s", name);
+	if (ret < 0) {
+		fclose(fp);
+		return ret;
+	}
+
+	ret = fclose(fp);
+	if (ret == EOF)
+		return -errno;
+
+
+	/* blob */
+	blob = state_get_var(state, name);
+	if (!blob)
+		return -ENOENT;
+
+	len = strlen(blob) + 1;
+	blob_bin = xzalloc(len);
+	len = decode_base64(blob_bin, len, blob);
+	free(blob);
+
+	fd = open(blob_gen_blob, O_WRONLY);
+	if (fd < 0) {
+		free(blob_bin);
+		return -errno;
+	}
+
+	ret = write(fd, blob_bin, len);
+	free(blob_bin);
+	if (ret != len) {
+		return -errno;
+	}
+
+	ret = close(fd);
+	if (ret)
+		return -errno;
+
+
+	/* payload */
+	fd = open(blob_gen_payload, O_RDONLY);
+	if (fd < 0) {
+		free(blob_bin);
+		return -errno;
+	}
+
+	payload = xzalloc(len);
+	len = read(fd, payload, len);
+	close(fd);
+	if (len <= 0) {
+		free(payload);
+		return -errno;
+	}
+
+	payload_bin = xzalloc(len);
+	len = decode_base64(payload_bin, len, payload);
+	free(payload);
+
+	*key = payload_bin;
+	*key_len = len;
+
+	return 0;
+}
diff --git a/src/keystore.c b/src/keystore.c
deleted file mode 100644
index c4c7d5e..0000000
--- a/src/keystore.c
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * keystore - simple keystore
- *
- * Copyright (c) 2015 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <errno.h>
-
-int __attribute__((weak)) keystore_get_secret(const char *name, const unsigned char **key, int *key_len)
-{
-	return -ENOENT;
-}