This patch adds a simple keystore to barebox. The keystore implements a simple
key-value store to hold arbitrary values.
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
crypto/Kconfig | 6 ++++
crypto/Makefile | 1 +
crypto/keystore.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++
include/crypto/keystore.h | 26 +++++++++++++++
4 files changed, 113 insertions(+)
create mode 100644 crypto/keystore.c
create mode 100644 include/crypto/keystore.h
diff --git a/crypto/Kconfig b/crypto/Kconfig
index ef807dec68de..10b34912b007 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -84,3 +84,9 @@ config CRYPTO_PBKDF2
select DIGEST
select DIGEST_SHA1_GENERIC
bool
+
+config CRYPTO_KEYSTORE
+ bool "Keystore"
+ help
+ This is a simple keystore, which can be used to pass keys
+ between several components via simple interface.
diff --git a/crypto/Makefile b/crypto/Makefile
index f39de718e5e7..c6d17787ca4e 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_DIGEST_SHA384_GENERIC) += sha4.o
obj-$(CONFIG_DIGEST_SHA512_GENERIC) += sha4.o
obj-$(CONFIG_CRYPTO_PBKDF2) += pbkdf2.o
+obj-$(CONFIG_CRYPTO_KEYSTORE) += keystore.o
diff --git a/crypto/keystore.c b/crypto/keystore.c
new file mode 100644
index 000000000000..90b470fe6717
--- /dev/null
+++ b/crypto/keystore.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Marc Kleine-Budde <kernel@xxxxxxxxxxxxxx>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/list.h>
+
+static LIST_HEAD(keystore_list);
+
+#define for_each_key(key) list_for_each_entry(key, &keystore_list, list)
+
+struct keystore_key {
+ struct list_head list;
+ const char *name;
+ const u8 *secret;
+ int secret_len;
+};
+
+static int keystore_compare(struct list_head *a, struct list_head *b)
+{
+ const char *na = list_entry(a, struct keystore_key, list)->name;
+ const char *nb = list_entry(b, struct keystore_key, list)->name;
+
+ return strcmp(na, nb);
+}
+
+/**
+ * @param[in] name Name of the secret to get
+ * @param[out] secret Double pointer to memory representing the secret, do _not_ free() after use
+ * @param[out] secret_len Pointer to length of the secret
+ */
+int keystore_get_secret(const char *name, const u8 **secret, int *secret_len)
+{
+ struct keystore_key *key;
+
+ for_each_key(key) {
+ if (!strcmp(name, key->name)) {
+ if (!secret || !secret_len)
+ return 0;
+
+ *secret = key->secret;
+ *secret_len = key->secret_len;
+
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * @param[in] name Name of the secret to set
+ * @param[in] secret Pointer to memory holding the secret
+ * @param[in] secret_len Length of the secret
+ */
+int keystore_set_secret(const char *name, const u8 *secret, int secret_len)
+{
+ struct keystore_key *key;
+ int ret;
+
+ /* check if key is already in store */
+ ret = keystore_get_secret(name, NULL, NULL);
+ if (!ret)
+ return -EBUSY;
+
+ key = xzalloc(sizeof(*key));
+ INIT_LIST_HEAD(&key->list);
+ key->name = xstrdup(name);
+ key->secret = xmemdup(secret, secret_len);
+ key->secret_len = secret_len;
+
+ list_add_sort(&key->list, &keystore_list, keystore_compare);
+
+ return 0;
+}
diff --git a/include/crypto/keystore.h b/include/crypto/keystore.h
new file mode 100644
index 000000000000..29915854b851
--- /dev/null
+++ b/include/crypto/keystore.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Marc Kleine-Budde <kernel@xxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef __CRYPTO_KEYSTORE_H
+#define __CRYPTO_KEYSTORE_H
+
+#ifdef CONFIG_CRYPTO_KEYSTORE
+int keystore_get_secret(const char *name, const u8 **secret, int *secret_len);
+int keystore_set_secret(const char *name, const u8 *secret, int secret_len);
+#else
+static inline int keystore_get_secret(const char *name, const u8 **secret, int *secret_len)
+{
+ return -EINVAL;
+}
+static inline int keystore_set_secret(const char *name, const u8 *secret, int secret_len)
+{
+ return 0;
+}
+#endif
+
+#endif
--
2.6.1
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