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Diffstat (limited to 'src/libstrongswan/utils/chunk.h')
| -rw-r--r-- | src/libstrongswan/utils/chunk.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/libstrongswan/utils/chunk.h b/src/libstrongswan/utils/chunk.h index 9951ff31f..48405b77e 100644 --- a/src/libstrongswan/utils/chunk.h +++ b/src/libstrongswan/utils/chunk.h @@ -412,6 +412,31 @@ u_int32_t chunk_hash_static_inc(chunk_t chunk, u_int32_t hash); u_int64_t chunk_mac(chunk_t chunk, u_char *key); /** + * Calculate the Internet Checksum according to RFC 1071 for the given chunk. + * + * If the result is used with chunk_internet_checksum_inc() and the data length + * is not a multiple of 16 bit the checksum bytes have to be swapped to + * compensate the even/odd alignment. + * + * @param data data to process + * @return checksum (one's complement, network order) + */ +u_int16_t chunk_internet_checksum(chunk_t data); + +/** + * Extend the given Internet Checksum (one's complement, in network byte order) + * with the given data. + * + * If data is not a multiple of 16 bits the checksum may have to be swapped to + * compensate even/odd alignment (see chunk_internet_checksum()). + * + * @param data data to process + * @param checksum previous checksum (one's complement, network order) + * @return checksum (one's complement, network order) + */ +u_int16_t chunk_internet_checksum_inc(chunk_t data, u_int16_t checksum); + +/** * printf hook function for chunk_t. * * Arguments are: |