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Diffstat (limited to 'Godeps/_workspace/src/github.com/ethereum/ethash/libethash/internal.c')
| -rw-r--r-- | Godeps/_workspace/src/github.com/ethereum/ethash/libethash/internal.c | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/ethereum/ethash/libethash/internal.c b/Godeps/_workspace/src/github.com/ethereum/ethash/libethash/internal.c new file mode 100644 index 000000000..cc48717d0 --- /dev/null +++ b/Godeps/_workspace/src/github.com/ethereum/ethash/libethash/internal.c @@ -0,0 +1,297 @@ +/* + This file is part of cpp-ethereum. + + cpp-ethereum is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + cpp-ethereum is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>. +*/ +/** @file dash.cpp +* @author Tim Hughes <tim@twistedfury.com> +* @author Matthew Wampler-Doty +* @date 2015 +*/ + +#include <assert.h> +#include <inttypes.h> +#include <stddef.h> +#include "ethash.h" +#include "fnv.h" +#include "endian.h" +#include "internal.h" +#include "data_sizes.h" + +#ifdef WITH_CRYPTOPP + +#include "SHA3_cryptopp.h" + +#else +#include "sha3.h" +#endif // WITH_CRYPTOPP + +size_t const ethash_get_datasize(const uint32_t block_number) { + assert(block_number / EPOCH_LENGTH < 500); + return dag_sizes[block_number / EPOCH_LENGTH]; +} + +size_t const ethash_get_cachesize(const uint32_t block_number) { + assert(block_number / EPOCH_LENGTH < 500); + return cache_sizes[block_number / EPOCH_LENGTH]; +} + +// Follows Sergio's "STRICT MEMORY HARD HASHING FUNCTIONS" (2014) +// https://bitslog.files.wordpress.com/2013/12/memohash-v0-3.pdf +// SeqMemoHash(s, R, N) +void static ethash_compute_cache_nodes( + node *const nodes, + ethash_params const *params, + const uint8_t seed[32]) { + assert((params->cache_size % sizeof(node)) == 0); + uint32_t const num_nodes = (uint32_t)(params->cache_size / sizeof(node)); + + SHA3_512(nodes[0].bytes, seed, 32); + + for (unsigned i = 1; i != num_nodes; ++i) { + SHA3_512(nodes[i].bytes, nodes[i - 1].bytes, 64); + } + + for (unsigned j = 0; j != CACHE_ROUNDS; j++) { + for (unsigned i = 0; i != num_nodes; i++) { + uint32_t const idx = nodes[i].words[0] % num_nodes; + node data; + data = nodes[(num_nodes - 1 + i) % num_nodes]; + for (unsigned w = 0; w != NODE_WORDS; ++w) + { + data.words[w] ^= nodes[idx].words[w]; + } + SHA3_512(nodes[i].bytes, data.bytes, sizeof(data)); + } + } + + // now perform endian conversion +#if BYTE_ORDER != LITTLE_ENDIAN + for (unsigned w = 0; w != (num_nodes*NODE_WORDS); ++w) + { + nodes->words[w] = fix_endian32(nodes->words[w]); + } +#endif +} + +void ethash_mkcache( + ethash_cache *cache, + ethash_params const *params, + const uint8_t seed[32]) { + node *nodes = (node *) cache->mem; + ethash_compute_cache_nodes(nodes, params, seed); +} + +void ethash_calculate_dag_item( + node *const ret, + const unsigned node_index, + const struct ethash_params *params, + const struct ethash_cache *cache) { + + uint32_t num_parent_nodes = (uint32_t)(params->cache_size / sizeof(node)); + node const *cache_nodes = (node const *) cache->mem; + node const *init = &cache_nodes[node_index % num_parent_nodes]; + + memcpy(ret, init, sizeof(node)); + ret->words[0] ^= node_index; + SHA3_512(ret->bytes, ret->bytes, sizeof(node)); + +#if defined(_M_X64) && ENABLE_SSE + __m128i const fnv_prime = _mm_set1_epi32(FNV_PRIME); + __m128i xmm0 = ret->xmm[0]; + __m128i xmm1 = ret->xmm[1]; + __m128i xmm2 = ret->xmm[2]; + __m128i xmm3 = ret->xmm[3]; +#endif + + for (unsigned i = 0; i != DAG_PARENTS; ++i) + { + uint32_t parent_index = ((node_index ^ i)*FNV_PRIME ^ ret->words[i % NODE_WORDS]) % num_parent_nodes; + node const *parent = &cache_nodes[parent_index]; + + #if defined(_M_X64) && ENABLE_SSE + { + xmm0 = _mm_mullo_epi32(xmm0, fnv_prime); + xmm1 = _mm_mullo_epi32(xmm1, fnv_prime); + xmm2 = _mm_mullo_epi32(xmm2, fnv_prime); + xmm3 = _mm_mullo_epi32(xmm3, fnv_prime); + xmm0 = _mm_xor_si128(xmm0, parent->xmm[0]); + xmm1 = _mm_xor_si128(xmm1, parent->xmm[1]); + xmm2 = _mm_xor_si128(xmm2, parent->xmm[2]); + xmm3 = _mm_xor_si128(xmm3, parent->xmm[3]); + + // have to write to ret as values are used to compute index + ret->xmm[0] = xmm0; + ret->xmm[1] = xmm1; + ret->xmm[2] = xmm2; + ret->xmm[3] = xmm3; + } + #else + { + for (unsigned w = 0; w != NODE_WORDS; ++w) { + ret->words[w] = fnv_hash(ret->words[w], parent->words[w]); + } + } + #endif + } + + SHA3_512(ret->bytes, ret->bytes, sizeof(node)); +} + +void ethash_compute_full_data( + void *mem, + ethash_params const *params, + ethash_cache const *cache) { + assert((params->full_size % (sizeof(uint32_t) * MIX_WORDS)) == 0); + assert((params->full_size % sizeof(node)) == 0); + node *full_nodes = mem; + + // now compute full nodes + for (unsigned n = 0; n != (params->full_size / sizeof(node)); ++n) { + ethash_calculate_dag_item(&(full_nodes[n]), n, params, cache); + } +} + +static void ethash_hash( + ethash_return_value * ret, + node const *full_nodes, + ethash_cache const *cache, + ethash_params const *params, + const uint8_t header_hash[32], + const uint64_t nonce) { + + assert((params->full_size % MIX_WORDS) == 0); + + // pack hash and nonce together into first 40 bytes of s_mix + assert(sizeof(node)*8 == 512); + node s_mix[MIX_NODES + 1]; + memcpy(s_mix[0].bytes, header_hash, 32); + +#if BYTE_ORDER != LITTLE_ENDIAN + s_mix[0].double_words[4] = fix_endian64(nonce); +#else + s_mix[0].double_words[4] = nonce; +#endif + + // compute sha3-512 hash and replicate across mix + SHA3_512(s_mix->bytes, s_mix->bytes, 40); + +#if BYTE_ORDER != LITTLE_ENDIAN + for (unsigned w = 0; w != 16; ++w) { + s_mix[0].words[w] = fix_endian32(s_mix[0].words[w]); + } +#endif + + node* const mix = s_mix + 1; + for (unsigned w = 0; w != MIX_WORDS; ++w) { + mix->words[w] = s_mix[0].words[w % NODE_WORDS]; + } + + unsigned const + page_size = sizeof(uint32_t) * MIX_WORDS, + num_full_pages = (unsigned)(params->full_size / page_size); + + + for (unsigned i = 0; i != ACCESSES; ++i) + { + uint32_t const index = ((s_mix->words[0] ^ i)*FNV_PRIME ^ mix->words[i % MIX_WORDS]) % num_full_pages; + + for (unsigned n = 0; n != MIX_NODES; ++n) + { + const node * dag_node = &full_nodes[MIX_NODES * index + n]; + + if (!full_nodes) { + node tmp_node; + ethash_calculate_dag_item(&tmp_node, index * MIX_NODES + n, params, cache); + dag_node = &tmp_node; + } + + #if defined(_M_X64) && ENABLE_SSE + { + __m128i fnv_prime = _mm_set1_epi32(FNV_PRIME); + __m128i xmm0 = _mm_mullo_epi32(fnv_prime, mix[n].xmm[0]); + __m128i xmm1 = _mm_mullo_epi32(fnv_prime, mix[n].xmm[1]); + __m128i xmm2 = _mm_mullo_epi32(fnv_prime, mix[n].xmm[2]); + __m128i xmm3 = _mm_mullo_epi32(fnv_prime, mix[n].xmm[3]); + mix[n].xmm[0] = _mm_xor_si128(xmm0, dag_node->xmm[0]); + mix[n].xmm[1] = _mm_xor_si128(xmm1, dag_node->xmm[1]); + mix[n].xmm[2] = _mm_xor_si128(xmm2, dag_node->xmm[2]); + mix[n].xmm[3] = _mm_xor_si128(xmm3, dag_node->xmm[3]); + } + #else + { + for (unsigned w = 0; w != NODE_WORDS; ++w) { + mix[n].words[w] = fnv_hash(mix[n].words[w], dag_node->words[w]); + } + } + #endif + } + + } + + // compress mix + for (unsigned w = 0; w != MIX_WORDS; w += 4) + { + uint32_t reduction = mix->words[w+0]; + reduction = reduction*FNV_PRIME ^ mix->words[w+1]; + reduction = reduction*FNV_PRIME ^ mix->words[w+2]; + reduction = reduction*FNV_PRIME ^ mix->words[w+3]; + mix->words[w/4] = reduction; + } + +#if BYTE_ORDER != LITTLE_ENDIAN + for (unsigned w = 0; w != MIX_WORDS/4; ++w) { + mix->words[w] = fix_endian32(mix->words[w]); + } +#endif + + memcpy(ret->mix_hash, mix->bytes, 32); + // final Keccak hash + SHA3_256(ret->result, s_mix->bytes, 64+32); // Keccak-256(s + compressed_mix) +} + +void ethash_quick_hash( + uint8_t return_hash[32], + const uint8_t header_hash[32], + const uint64_t nonce, + const uint8_t mix_hash[32]) { + + uint8_t buf[64+32]; + memcpy(buf, header_hash, 32); +#if BYTE_ORDER != LITTLE_ENDIAN + nonce = fix_endian64(nonce); +#endif + memcpy(&(buf[32]), &nonce, 8); + SHA3_512(buf, buf, 40); + memcpy(&(buf[64]), mix_hash, 32); + SHA3_256(return_hash, buf, 64+32); +} + +int ethash_quick_check_difficulty( + const uint8_t header_hash[32], + const uint64_t nonce, + const uint8_t mix_hash[32], + const uint8_t difficulty[32]) { + uint8_t return_hash[32]; + ethash_quick_hash(return_hash, header_hash, nonce, mix_hash); + return ethash_check_difficulty(return_hash, difficulty); +} + +void ethash_full(ethash_return_value * ret, void const *full_mem, ethash_params const *params, const uint8_t previous_hash[32], const uint64_t nonce) { + ethash_hash(ret, (node const *) full_mem, NULL, params, previous_hash, nonce); +} + +void ethash_light(ethash_return_value * ret, ethash_cache const *cache, ethash_params const *params, const uint8_t previous_hash[32], const uint64_t nonce) { + ethash_hash(ret, NULL, cache, params, previous_hash, nonce); +} |