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author | Trygve Laugstøl <trygvis@inamo.no> | 2018-08-23 17:08:59 +0200 |
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committer | Trygve Laugstøl <trygvis@inamo.no> | 2018-08-23 17:12:21 +0200 |
commit | 3061ecca3d0fdfb87dabbf5f63c9e06c2a30f53a (patch) | |
tree | ab49cc16ed0b853452c5c2ed2d3042416d628986 /thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/cifra_eax_aes.h | |
download | iot-sensors-master.tar.gz iot-sensors-master.tar.bz2 iot-sensors-master.tar.xz iot-sensors-master.zip |
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/cifra_eax_aes.h')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/cifra_eax_aes.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/cifra_eax_aes.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/cifra_eax_aes.h new file mode 100644 index 0000000..2ee7f46 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/cifra_eax_aes.h @@ -0,0 +1,152 @@ +/* + * cifra - embedded cryptography library + * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com> + * + * To the extent possible under law, the author(s) have dedicated all + * copyright and related and neighboring rights to this software to the + * public domain worldwide. This software is distributed without any + * warranty. + * + * You should have received a copy of the CC0 Public Domain Dedication + * along with this software. If not, see + * <http://creativecommons.org/publicdomain/zero/1.0/>. + */ + +/** + * The AES block cipher + * ==================== + * + * This is a small, simple implementation of AES. Key expansion is done + * first, filling in a :c:type:`cf_aes_context`. Then encryption and + * decryption can be performed as desired. + * + * Usually you don't want to use AES directly; you should use it via + * a :doc:`block cipher mode <modes>`. + */ + +#ifndef AES_H +#define AES_H + +#include <stddef.h> +#include <stdint.h> + +#include "prp.h" + +/* .. c:macro:: AES_BLOCKSZ + * AES has a 128-bit block size. This quantity is in bytes. + */ +#define AES_BLOCKSZ 16 + +/* --- Size configuration --- */ + +/* .. c:macro:: AES128_ROUNDS + * .. c:macro:: AES192_ROUNDS + * .. c:macro:: AES256_ROUNDS + * + * Round counts for different key sizes. + */ +#define AES128_ROUNDS 10 +#define AES192_ROUNDS 12 +#define AES256_ROUNDS 14 + +/* .. c:macro:: CF_AES_MAXROUNDS + * + * You can reduce the maximum number of rounds this implementation + * supports. This reduces the storage needed by :c:type:`cf_aes_context`. + * + * The default is :c:macro:`AES256_ROUNDS` and is good for all key + * sizes. + */ +#ifndef CF_AES_MAXROUNDS +# define CF_AES_MAXROUNDS AES256_ROUNDS +#endif + +/* .. c:macro:: CF_AES_ENCRYPT_ONLY + * + * Define this to 1 if you don't need to decrypt anything. + * This saves space. :c:func:`cf_aes_decrypt` calls `abort(3)`. + */ +#ifndef CF_AES_ENCRYPT_ONLY +# define CF_AES_ENCRYPT_ONLY 0 +#endif + +/* .. c:type:: cf_aes_context + * This type represents an expanded AES key. Create one + * using :c:func:`cf_aes_init`, make use of one using + * :c:func:`cf_aes_encrypt` or :c:func:`cf_aes_decrypt`. + * + * The contents of this structure are equivalent to the + * original key material. You should clean the + * contents of this structure with :c:func:`cf_aes_finish` + * when you're done. + * + * .. c:member:: cf_aes_context.rounds + * + * Number of rounds to use, set by :c:func:`cf_aes_init`. + * + * This depends on the original key size, and will be + * :c:macro:`AES128_ROUNDS`, :c:macro:`AES192_ROUNDS` or + * :c:macro:`AES256_ROUNDS`. + * + * .. c:member:: cf_aes_context.ks + * + * Expanded key material. Filled in by :c:func:`cf_aes_init`. + */ +typedef struct +{ + uint32_t rounds; + uint32_t ks[AES_BLOCKSZ / 4 * (CF_AES_MAXROUNDS + 1)]; +} cf_aes_context; + +/* .. c:function:: $DECL + * This function does AES key expansion. It destroys + * existing contents of :c:data:`ctx`. + * + * :param ctx: expanded key context, filled in by this function. + * :param key: pointer to key material, of :c:data:`nkey` bytes. + * :param nkey: length of key material. Must be `16`, `24` or `32`. + */ +extern void cf_aes_init(cf_aes_context *ctx, + const uint8_t *key, + size_t nkey); + +/* .. c:function:: $DECL + * Encrypts the given block, from :c:data:`in` to :c:data:`out`. + * These may alias. + * + * Fails at runtime if :c:data:`ctx` is invalid. + * + * :param ctx: expanded key context + * :param in: input block (read) + * :param out: output block (written) + */ +extern void cf_aes_encrypt(const cf_aes_context *ctx, + const uint8_t in[AES_BLOCKSZ], + uint8_t out[AES_BLOCKSZ]); + +/* .. c:function:: $DECL + * Decrypts the given block, from :c:data:`in` to :c:data:`out`. + * These may alias. + * + * Fails at runtime if :c:data:`ctx` is invalid. + * + * :param ctx: expanded key context + * :param in: input block (read) + * :param out: output block (written) + */ +extern void cf_aes_decrypt(const cf_aes_context *ctx, + const uint8_t in[AES_BLOCKSZ], + uint8_t out[AES_BLOCKSZ]); + +/* .. c:function:: $DECL + * Erase scheduled key material. + * + * Call this when you're done to erase the round keys. */ +extern void cf_aes_finish(cf_aes_context *ctx); + +/* .. c:var:: const cf_prp cf_aes + * Abstract interface to AES. See :c:type:`cf_prp` for + * more information. */ +extern const cf_prp cf_aes; + +#endif |