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Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/blockwise.h')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/blockwise.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/blockwise.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/blockwise.h new file mode 100644 index 0000000..a20ff95 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/cifra_AES128-EAX/blockwise.h @@ -0,0 +1,147 @@ +/* + * 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/>. + */ + +#ifndef BLOCKWISE_H +#define BLOCKWISE_H + +#include <stdint.h> +#include <stddef.h> + +/* Processing function for cf_blockwise_accumulate. */ +typedef void (*cf_blockwise_in_fn)(void *ctx, const uint8_t *data); + +/* Processing function for cf_blockwise_xor. */ +typedef void (*cf_blockwise_out_fn)(void *ctx, uint8_t *data); + +/* This function manages the common abstraction of accumulating input in + * a buffer, and processing it when a full block is available. + * + * partial is the buffer (maintained by the caller) + * on entry, npartial is the currently valid count of used bytes on + * the front of partial. + * on exit, npartial is updated to reflect the status of partial. + * nblock is the blocksize to accumulate -- partial must be at least + * this long! + * input is the new data to process, of length nbytes. + * process is the processing function, passed ctx and a pointer + * to the data to process (always exactly nblock bytes long!) + * which may not neccessarily be the same as partial. + */ +void cf_blockwise_accumulate(uint8_t *partial, size_t *npartial, + size_t nblock, + const void *input, size_t nbytes, + cf_blockwise_in_fn process, + void *ctx); + +/* This function manages the common abstraction of accumulating input in + * a buffer, and processing it when a full block is available. + * This version supports calling a different processing function for + * the last block. + * + * partial is the buffer (maintained by the caller) + * on entry, npartial is the currently valid count of used bytes on + * the front of partial. + * on exit, npartial is updated to reflect the status of partial. + * nblock is the blocksize to accumulate -- partial must be at least + * this long! + * input is the new data to process, of length nbytes. + * process is the processing function, passed ctx and a pointer + * to the data to process (always exactly nblock bytes long!) + * which may not neccessarily be the same as partial. + * process_final is called last (but may not be called at all if + * all input is buffered). + */ +void cf_blockwise_accumulate_final(uint8_t *partial, size_t *npartial, + size_t nblock, + const void *input, size_t nbytes, + cf_blockwise_in_fn process, + cf_blockwise_in_fn process_final, + void *ctx); + +/* This function manages XORing an input stream with a keystream + * to produce an output stream. The keystream is produced in blocks + * (ala a block cipher in counter mode). + * + * partial is the keystream buffer (maintained by the caller) + * on entry, *npartial is the currently valid count of bytes in partial: + * unused bytes are at the *end*. So *npartial = 4 means the last four + * bytes of partial are usable as keystream. + * on exit, npartial is updated to reflect the new state of partial. + * nblock is the blocksize to accumulate -- partial must be at least + * this long! + * input is the new data to process, of length nbytes. + * output is where to write input xored with the keystream -- also length + * nbytes. + * process is the processing function, passed ctx and partial which it + * should fill with fresh key stream. + */ +void cf_blockwise_xor(uint8_t *partial, size_t *npartial, + size_t nblock, + const void *input, void *output, size_t nbytes, + cf_blockwise_out_fn newblock, + void *ctx); + +/* This function processes a single byte a number of times. It's useful + * for padding, and more efficient than calling cf_blockwise_accumulate + * a bunch of times. + * + * partial is the buffer (maintained by the caller) + * on entry, npartial is the currently valid count of used bytes on + * the front of partial. + * on exit, npartial is updated to reflect the status of partial. + * nblock is the blocksize to accumulate -- partial must be at least + * this long! + * process is the processing function, passed ctx and a pointer + * to the data to process (always exactly nblock bytes long!) + * which may not neccessarily be the same as partial. + * byte is the byte to process, nbytes times. + */ +void cf_blockwise_acc_byte(uint8_t *partial, size_t *npartial, + size_t nblock, + uint8_t byte, size_t nbytes, + cf_blockwise_in_fn process, + void *ctx); + +/* This function attempts to process patterns of bytes common in + * block cipher padding. + * + * This takes three bytes: + * - a first byte, fbyte, + * - a middle byte, mbyte, + * - a last byte, lbyte. + * + * If nbytes is zero, nothing happens. + * If nbytes is one, the byte fbyte ^ lbyte is processed. + * If nbytes is two, the fbyte then lbyte are processed. + * If nbytes is three or more, fbyte, then one or more mbytes, then fbyte + * is processed. + * + * partial is the buffer (maintained by the caller) + * on entry, npartial is the currently valid count of used bytes on + * the front of partial. + * on exit, npartial is updated to reflect the status of partial. + * nblock is the blocksize to accumulate -- partial must be at least + * this long! + * process is the processing function, passed ctx and a pointer + * to the data to process (always exactly nblock bytes long!) + * which may not neccessarily be the same as partial. + */ +void cf_blockwise_acc_pad(uint8_t *partial, size_t *npartial, + size_t nblock, + uint8_t fbyte, uint8_t mbyte, uint8_t lbyte, + size_t nbytes, + cf_blockwise_in_fn process, + void *ctx); + +#endif |