pkg/libcose: add RIOT as crypto backend

makefiles/default_modules.deps.mk

@@ -14,6 +14,10 @@ ifneq (,$(filter auto_init_saul,$(USEMODULE)))
   USEMODULE += saul_init_devs
 endif
 
+ifneq (,$(filter auto_init_libcose_crypt,$(USEMODULE)))
+  USEMODULE += libcose_crypt_init
+endif
+
 ifneq (,$(filter xtimer,$(USEMODULE)))
   ifeq (,$(filter ztimer_xtimer_compat,$(USEMODULE)))
     USEMODULE += div

pkg/libcose/Kconfig

@@ -31,6 +31,21 @@ config MODULE_LIBCOSE_CRYPT_MONOCYPHER
     depends on TEST_KCONFIG
     depends on PACKAGE_MONOCYPHER
 
+config MODULE_LIBCOSE_CRYPT_RIOT
+    bool "COSE use RIOT backend"
+    depends on TEST_KCONFIG
+    select MODULE_CRYPTO
+
+config MODULE_LIBCOSE_CRYPT_INIT
+    bool "LibCose Crypt Initialization functions"
+    default y
+
+config MODULE_AUTO_INIT_LIBCOSE_CRYPT
+    bool "Auto initialize LibCose Crypt"
+    depends on MODULE_AUTO_INIT
+    select MODULE_LIBCOSE_CRYPT_INIT
+    default y
+
 endif # PACKAGE_LIBCOSE
 
 config MODULE_LIBCOSE_CRYPT

pkg/libcose/Makefile

@@ -1,6 +1,6 @@
 PKG_NAME=libcose
 PKG_URL=https://github.com/bergzand/libcose
-PKG_VERSION=2929fdce7affbd5bb9db201370d95d8f7cf680f9
+PKG_VERSION=ea1fed87d6ca9b478f8bed323af97e6b192c0a6d
 PKG_LICENSE=LGPL
 
 include $(RIOTBASE)/pkg/pkg.mk

pkg/libcose/Makefile.dep

@@ -13,3 +13,12 @@ endif
 ifneq (,$(filter libcose_crypt_tinycrypt,$(USEMODULE)))
   USEPKG += tinycrypt
 endif
+ifneq (,$(filter libcose_crypt_monocypher,$(USEMODULE)))
+  USEPKG += monocypher
+endif
+ifneq (,$(filter libcose_crypt_riot,$(USEMODULE)))
+  USEMODULE += crypto
+endif
+
+DEFAULT_MODULE += libcose_crypt_init
+DEFAULT_MODULE += auto_init_libcose_crypt

pkg/libcose/Makefile.include

@@ -1,4 +1,7 @@
-INCLUDES += -I$(PKGDIRBASE)/libcose/include
+INCLUDES += -I$(PKGDIRBASE)/libcose/include \
+            -I$(RIOTBASE)/pkg/libcose/include \
+            #
+
 CFLAGS += -DUSE_CBOR_CONTEXT
 
 ifneq (,$(filter libcose_crypt_hacl,$(USEMODULE)))
@@ -10,6 +13,20 @@ endif
 ifneq (,$(filter libcose_crypt_tinycrypt,$(USEMODULE)))
   CFLAGS += -DCRYPTO_TINYCRYPT
 endif
+ifneq (,$(filter libcose_crypt_monocypher,$(USEMODULE)))
+  CFLAGS += -DCRYPTO_MONOCYPHER
+endif
+ifneq (,$(filter libcose_crypt_riot,$(USEMODULE)))
+  CFLAGS += -DCRYPTO_RIOT
+  DIRS += $(RIOTBASE)/pkg/libcose/contrib
+endif
+ifneq (,$(filter libcose_crypt_init,$(USEMODULE)))
+  DIRS += $(RIOTBASE)/pkg/libcose/init
+endif
 
 # Declare pseudomodules here to be selfcontained
-PSEUDOMODULES += libcose_crypt_%
+PSEUDOMODULES += libcose_crypt_c25519
+PSEUDOMODULES += libcose_crypt_hacl
+PSEUDOMODULES += libcose_crypt_tinycrypt
+PSEUDOMODULES += libcose_crypt_monocypher
+PSEUDOMODULES += auto_init_libcose_crypt

pkg/libcose/Makefile.libcose_crypt

@@ -1,4 +1,6 @@
 MODULE := libcose_crypt
 SUBMODULES = 1
 
+SRC += keygen_symm.c
+
 include $(RIOTBASE)/Makefile.base

pkg/libcose/contrib/Makefile

@@ -0,0 +1,3 @@
+MODULE = libcose_crypt_riot
+
+include $(RIOTBASE)/Makefile.base

pkg/libcose/contrib/libcose_riot_crypto.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2022 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     pkg_libcose
+ * @{
+ *
+ * @file
+ * @brief       RIOT as a crypto backend for libcose implementation
+ *
+ * @author      Francisco Molina <[email protected]>
+ *
+ * @}
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "crypto/chacha20poly1305.h"
+
+#include "cose.h"
+#include "cose/crypto.h"
+#include "cose/crypto/selectors.h"
+
+int cose_crypto_aead_encrypt_chachapoly(uint8_t *c, size_t *clen,
+                                        const uint8_t *msg, size_t msglen,
+                                        const uint8_t *aad, size_t aadlen,
+                                        const uint8_t *npub, const uint8_t *k)
+{
+    if (*clen < msglen + CHACHA20POLY1305_TAG_BYTES) {
+        return COSE_ERR_INVALID_PARAM;
+    }
+    chacha20poly1305_encrypt(c, msg, msglen, aad, aadlen, k, npub);
+    *clen = msglen + CHACHA20POLY1305_TAG_BYTES;
+    return COSE_OK;
+}
+
+int cose_crypto_aead_decrypt_chachapoly(uint8_t *msg, size_t *msglen,
+                                        const uint8_t *c, size_t clen,
+                                        const uint8_t *aad, size_t aadlen,
+                                        const uint8_t *npub, const uint8_t *k)
+{
+    if (chacha20poly1305_decrypt(c, clen, msg, msglen, aad, aadlen, k, npub) == 1) {
+        return COSE_OK;
+    }
+    else {
+        return COSE_ERR_CRYPTO;
+    }
+}

pkg/libcose/include/cose/crypto/riot.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2022 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     pkg_libcose
+ *
+ * @{
+ *
+ * @file
+ * @brief       Crypto function api for glueing RIOT crypto libraries
+ *
+ * @author      Francisco Molina <[email protected]>
+ */
+
+#ifndef COSE_CRYPTO_RIOT_H
+#define COSE_CRYPTO_RIOT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef AUTO_INIT_PRIO_MOD_LIBCOSE
+/**
+ * @brief   libCOSE init priority
+ */
+#define AUTO_INIT_PRIO_MOD_LIBCOSE                      1050
+#endif
+
+/**
+ * @name list of provided algorithms
+ *
+ * @{
+ */
+#define HAVE_ALGO_CHACHA20POLY1305
+/** @} */
+
+/**
+ * @brief   Initialize libCOSE RIOT crypto backend
+ *
+ * @note    Automatically called if 'auto_init_libcose_crypt_riot' is included
+ *
+ */
+void libcose_crypt_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* COSE_CRYPTO_RIOT_H */
+
+/** @} */

pkg/libcose/init/Makefile

@@ -0,0 +1,3 @@
+MODULE = libcose_crypt_init
+
+include $(RIOTBASE)/Makefile.base

pkg/libcose/init/init.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2022 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     pkg_libcose
+ * @{
+ *
+ * @file
+ * @brief       RIOT as a crypto backend common functions
+ *
+ * @author      Francisco Molina <[email protected]>
+ *
+ * @}
+ */
+
+
+#include <stdint.h>
+#include "random.h"
+#include "kernel_defines.h"
+#include "xfa.h"
+
+#include "cose/crypto.h"
+
+#if IS_USED(MODULE_AUTO_INIT)
+#include "auto_init_utils.h"
+#endif
+
+static int _riot_random_bytes(void* arg, unsigned char * buf, size_t len)
+{
+    (void)arg;
+    random_bytes((uint8_t*) buf, len);
+    return 1;
+}
+
+void libcose_crypt_init(void)
+{
+    cose_crypt_set_rng(_riot_random_bytes, NULL);
+}
+
+#if IS_USED(MODULE_AUTO_INIT_LIBCOSE_CRYPT)
+/* initialize just after random module */
+AUTO_INIT(libcose_crypt_init, AUTO_INIT_PRIO_MOD_LIBCOSE);
+#endif