From 5ff4c5af715d098852d124de116d354ee10f4ea4 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Mon, 11 Feb 2019 16:22:00 +0100 Subject: Split most .c files into one per function and flatten file hierarchy MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libkeccak_degeneralise_spec.c | 111 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 libkeccak_degeneralise_spec.c (limited to 'libkeccak_degeneralise_spec.c') diff --git a/libkeccak_degeneralise_spec.c b/libkeccak_degeneralise_spec.c new file mode 100644 index 0000000..13963f8 --- /dev/null +++ b/libkeccak_degeneralise_spec.c @@ -0,0 +1,111 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +#ifdef __GNUC__ +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Wmaybe-uninitialized" +#endif + +#define have(v) (spec->v != LIBKECCAK_GENERALISED_SPEC_AUTOMATIC) +#define copy(v) (v = spec->v) +#define deft(v, dv) (have_##v ? v : (dv)) + + +/** + * Convert a `libkeccak_generalised_spec_t` to a `libkeccak_spec_t` + * + * If you are interrested in finding errors, you should call + * `libkeccak_spec_check(output)` if this function returns zero + * + * @param spec The generalised input specifications, will be update with resolved automatic values + * @param output_spec The specification datastructure to fill in + * @return Zero if `spec` is valid, a `LIBKECCAK_GENERALISED_SPEC_ERROR_*` if an error was found + */ +int +libkeccak_degeneralise_spec(libkeccak_generalised_spec_t *restrict spec, + libkeccak_spec_t *restrict output_spec) +{ + long int state_size, word_size, capacity, bitrate, output; + const int have_state_size = have(state_size); + const int have_word_size = have(word_size); + const int have_capacity = have(capacity); + const int have_bitrate = have(bitrate); + const int have_output = have(output); + + + if (have_state_size) { + copy(state_size); + if (state_size <= 0) return LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_NONPOSITIVE; + if (state_size > 1600) return LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_TOO_LARGE; + if (state_size % 25) return LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_MOD_25; + } + + if (have_word_size) { + copy(word_size); + if (word_size <= 0) return LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_NONPOSITIVE; + if (word_size > 64) return LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_TOO_LARGE; + if (have_state_size && state_size != word_size * 25) + return LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_WORD_INCOHERENCY; + else if (!have_state_size) + spec->state_size = 1, state_size = word_size * 25; + } + + if (have_capacity) { + copy(capacity); + if (capacity <= 0) return LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_NONPOSITIVE; + if (capacity & 7) return LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_MOD_8; + } + + if (have_bitrate) { + copy(bitrate); + if (bitrate <= 0) return LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_NONPOSITIVE; + if (bitrate & 7) return LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_MOD_8; + } + + if (have_output) { + copy(output); + if (output <= 0) return LIBKECCAK_GENERALISED_SPEC_ERROR_OUTPUT_NONPOSITIVE; + } + + + if (!have_bitrate && !have_capacity && !have_output) { + state_size = deft(state_size, 1600L); + output = ((state_size << 5) / 100L + 7L) & ~0x07L; + bitrate = output << 1; + capacity = state_size - bitrate; + output = output >= 8 ? output : 8; + } else if (!have_bitrate && !have_capacity) { + bitrate = 1024; + capacity = 1600 - 1024; + state_size = deft(state_size, bitrate + capacity); + } else if (!have_bitrate) { + state_size = deft(state_size, 1600L); + bitrate = state_size - capacity; + output = deft(output, capacity == 8 ? 8 : (capacity << 1)); + } else if (!have_capacity) { + state_size = deft(state_size, 1600L); + capacity = state_size - bitrate; + output = deft(output, capacity == 8 ? 8 : (capacity << 1)); + } else { + state_size = deft(state_size, bitrate + capacity); + output = deft(output, capacity == 8 ? 8 : (capacity << 1)); + } + + spec->capacity = output_spec->capacity = capacity; + spec->bitrate = output_spec->bitrate = bitrate; + spec->output = output_spec->output = output; + spec->state_size = state_size; + spec->word_size = state_size / 25; + + return 0; +} + + +#undef deft +#undef copy +#undef have + +#ifdef __GNUC__ +# pragma GCC diagnostic pop +#endif -- cgit v1.2.3-70-g09d2