Initial commit of crypto add-on

NOTE: probably better to merge this in pprzlink, seems unnatural here

conf/airframes/AGGIEAIR/aggieair_minion_rp3_lia.xml

@@ -61,6 +61,7 @@ AggieAir RP3 Minion
     <module name="nav" type="launcher"/>
     <module name="nav" type="skid_landing"/>
     <module name="sys_mon"/>
+    <module name="crypto"/>
     <module name="copilot"/>
     <module name="extra_dl">
       <!-- in order to use uart1 without chibios we need to remap the peripheral-->

conf/modules/crypto.xml

@@ -0,0 +1,22 @@
+<!DOCTYPE module SYSTEM "module.dtd">
+
+<module name="crypto" dir="crypto">
+  <doc>
+    <description>
+      GEC module
+    </description>
+  </doc>
+  <header>
+    <file name="crypto.h"/>
+  </header>
+  <makefile target="ap">
+    <define name="DATALINK_CRYPTO" value="1"/>
+    <file name="crypto.c"/>
+    <file name="gec-ke.c"/>
+    <file name="gec.c"/>
+    <file name="gcm.c" dir="modules/crypto/aes"/>
+    <file name="curve25519-donna.c" dir="modules/crypto/curve25519"/>
+    <file name="ed25519.c" dir="modules/crypto/ed25519"/>
+  </makefile>
+</module>
+

sw/airborne/modules/crypto/aes/aes.h

@@ -0,0 +1,118 @@
+/*
+---------------------------------------------------------------------------
+Copyright (c) 1998-2010, Brian Gladman, Worcester, UK. All rights reserved.
+
+The redistribution and use of this software (with or without changes)
+is allowed without the payment of fees or royalties provided that:
+
+  source code distributions include the above copyright notice, this
+  list of conditions and the following disclaimer;
+
+  binary distributions include the above copyright notice, this list
+  of conditions and the following disclaimer in their documentation.
+
+This software is provided 'as is' with no explicit or implied warranties
+in respect of its operation, including, but not limited to, correctness
+and fitness for purpose.
+---------------------------------------------------------------------------
+Issue Date: 20/12/2007
+
+ This file contains the definitions required to use AES in C. See aesopt.h
+ for optimisation details.
+*/
+
+#ifndef _AES_H
+#define _AES_H
+
+// #include <stdlib.h>
+
+/*  This include is used to find 8 & 32 bit unsigned integer types  */
+#include "brg_types.h"
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+#define AES_128     /* if a fast 128 bit key scheduler is needed    */
+
+/* The following must also be set in assembler files if being used  */
+
+#define AES_ENCRYPT /* if support for encryption is needed          */
+#define AES_DECRYPT /* if support for decryption is needed          */
+#define AES_REV_DKS /* define to reverse decryption key schedule    */
+#define AES_MODES
+
+#define AES_BLOCK_SIZE  16  /* the AES block size in bytes          */
+#define N_COLS           4  /* the number of columns in the state   */
+
+/* The key schedule length is 11, 13 or 15 16-byte blocks for 128,  */
+/* 192 or 256-bit keys respectively. That is 176, 208 or 240 bytes  */
+/* or 44, 52 or 60 32-bit words.                                    */
+
+#if defined( AES_VAR ) || defined( AES_256 )
+#define KS_LENGTH       60
+#elif defined( AES_192 )
+#define KS_LENGTH       52
+#else
+#define KS_LENGTH       44
+#endif
+
+#define AES_RETURN INT_RETURN
+
+/* the character array 'inf' in the following structures is used    */
+/* to hold AES context information. This AES code uses cx->inf.b[0] */
+/* to hold the number of rounds multiplied by 16. The other three   */
+/* elements can be used by code that implements additional modes    */
+
+typedef union
+{   uint_32t l;
+    uint_8t b[4];
+} aes_inf;
+
+typedef struct
+{   uint_32t ks[KS_LENGTH];
+    aes_inf inf;
+} aes_encrypt_ctx;
+
+typedef struct
+{   uint_32t ks[KS_LENGTH];
+    aes_inf inf;
+} aes_decrypt_ctx;
+
+/* This routine must be called before first use if non-static       */
+/* tables are being used                                            */
+
+AES_RETURN aes_init(void);
+
+/* Key lengths in the range 16 <= key_len <= 32 are given in bytes, */
+/* those in the range 128 <= key_len <= 256 are given in bits       */
+
+#if defined( AES_ENCRYPT )
+
+AES_RETURN aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]);
+AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1]);
+
+#endif
+
+#if defined( AES_DECRYPT )
+
+AES_RETURN aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]);
+AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1]);
+
+#endif
+
+typedef void cbuf_inc(unsigned char *cbuf);
+
+#define aes_ctr_encrypt aes_ctr_crypt
+#define aes_ctr_decrypt aes_ctr_crypt
+
+AES_RETURN aes_ctr_crypt(const unsigned char *ibuf, unsigned char *obuf,
+                    int len, unsigned char *cbuf, cbuf_inc ctr_inc, aes_encrypt_ctx cx[1]);
+
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif