diff --git a/THIRD-PARTY-LICENSES b/THIRD-PARTY-LICENSES
index 3e62013a50a6c66b49c57d9a86b832b5bde5e0ee..d3202f41ecbbfb9713f3a6822634d1af7b26036a 100644
--- a/THIRD-PARTY-LICENSES
+++ b/THIRD-PARTY-LICENSES
@@ -22,3 +22,8 @@ License: MIT License and BSD License
-------------------------------------------------------------------------
+Package: PicoSHA2
+Authors: okdshin
+License: MIT License
+
+-------------------------------------------------------------------------
diff --git a/xmrstak/picosha2/picosha2.hpp b/xmrstak/picosha2/picosha2.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..b9daec65fc75c5bf29f0742c4b29f5fe3745810a
--- /dev/null
+++ b/xmrstak/picosha2/picosha2.hpp
@@ -0,0 +1,375 @@
+/*
+The MIT License (MIT)
+
+Copyright (C) 2017 okdshin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+#ifndef PICOSHA2_H
+#define PICOSHA2_H
+// picosha2:20140213
+
+#ifndef PICOSHA2_BUFFER_SIZE_FOR_INPUT_ITERATOR
+#define PICOSHA2_BUFFER_SIZE_FOR_INPUT_ITERATOR \
+ 1048576 //=1024*1024: default is 1MB memory
+#endif
+
+#include <algorithm>
+#include <cassert>
+#include <iterator>
+#include <sstream>
+#include <vector>
+
+namespace picosha2 {
+typedef unsigned long word_t;
+typedef unsigned char byte_t;
+
+static const size_t k_digest_size = 32;
+
+namespace detail {
+inline byte_t mask_8bit(byte_t x) { return x & 0xff; }
+
+inline word_t mask_32bit(word_t x) { return x & 0xffffffff; }
+
+const word_t add_constant[64] = {
+ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
+ 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+ 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
+ 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+ 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+ 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
+ 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
+ 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+ 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
+
+const word_t initial_message_digest[8] = {0x6a09e667, 0xbb67ae85, 0x3c6ef372,
+ 0xa54ff53a, 0x510e527f, 0x9b05688c,
+ 0x1f83d9ab, 0x5be0cd19};
+
+inline word_t ch(word_t x, word_t y, word_t z) { return (x & y) ^ ((~x) & z); }
+
+inline word_t maj(word_t x, word_t y, word_t z) {
+ return (x & y) ^ (x & z) ^ (y & z);
+}
+
+inline word_t rotr(word_t x, std::size_t n) {
+ assert(n < 32);
+ return mask_32bit((x >> n) | (x << (32 - n)));
+}
+
+inline word_t bsig0(word_t x) { return rotr(x, 2) ^ rotr(x, 13) ^ rotr(x, 22); }
+
+inline word_t bsig1(word_t x) { return rotr(x, 6) ^ rotr(x, 11) ^ rotr(x, 25); }
+
+inline word_t shr(word_t x, std::size_t n) {
+ assert(n < 32);
+ return x >> n;
+}
+
+inline word_t ssig0(word_t x) { return rotr(x, 7) ^ rotr(x, 18) ^ shr(x, 3); }
+
+inline word_t ssig1(word_t x) { return rotr(x, 17) ^ rotr(x, 19) ^ shr(x, 10); }
+
+template <typename RaIter1, typename RaIter2>
+void hash256_block(RaIter1 message_digest, RaIter2 first, RaIter2 last) {
+ assert(first + 64 == last);
+ static_cast<void>(last); // for avoiding unused-variable warning
+ word_t w[64];
+ std::fill(w, w + 64, 0);
+ for (std::size_t i = 0; i < 16; ++i) {
+ w[i] = (static_cast<word_t>(mask_8bit(*(first + i * 4))) << 24) |
+ (static_cast<word_t>(mask_8bit(*(first + i * 4 + 1))) << 16) |
+ (static_cast<word_t>(mask_8bit(*(first + i * 4 + 2))) << 8) |
+ (static_cast<word_t>(mask_8bit(*(first + i * 4 + 3))));
+ }
+ for (std::size_t i = 16; i < 64; ++i) {
+ w[i] = mask_32bit(ssig1(w[i - 2]) + w[i - 7] + ssig0(w[i - 15]) +
+ w[i - 16]);
+ }
+
+ word_t a = *message_digest;
+ word_t b = *(message_digest + 1);
+ word_t c = *(message_digest + 2);
+ word_t d = *(message_digest + 3);
+ word_t e = *(message_digest + 4);
+ word_t f = *(message_digest + 5);
+ word_t g = *(message_digest + 6);
+ word_t h = *(message_digest + 7);
+
+ for (std::size_t i = 0; i < 64; ++i) {
+ word_t temp1 = h + bsig1(e) + ch(e, f, g) + add_constant[i] + w[i];
+ word_t temp2 = bsig0(a) + maj(a, b, c);
+ h = g;
+ g = f;
+ f = e;
+ e = mask_32bit(d + temp1);
+ d = c;
+ c = b;
+ b = a;
+ a = mask_32bit(temp1 + temp2);
+ }
+ *message_digest += a;
+ *(message_digest + 1) += b;
+ *(message_digest + 2) += c;
+ *(message_digest + 3) += d;
+ *(message_digest + 4) += e;
+ *(message_digest + 5) += f;
+ *(message_digest + 6) += g;
+ *(message_digest + 7) += h;
+ for (std::size_t i = 0; i < 8; ++i) {
+ *(message_digest + i) = mask_32bit(*(message_digest + i));
+ }
+}
+
+} // namespace detail
+
+template <typename InIter>
+void output_hex(InIter first, InIter last, std::ostream& os) {
+ os.setf(std::ios::hex, std::ios::basefield);
+ while (first != last) {
+ os.width(2);
+ os.fill('0');
+ os << static_cast<unsigned int>(*first);
+ ++first;
+ }
+ os.setf(std::ios::dec, std::ios::basefield);
+}
+
+template <typename InIter>
+void bytes_to_hex_string(InIter first, InIter last, std::string& hex_str) {
+ std::ostringstream oss;
+ output_hex(first, last, oss);
+ hex_str.assign(oss.str());
+}
+
+template <typename InContainer>
+void bytes_to_hex_string(const InContainer& bytes, std::string& hex_str) {
+ bytes_to_hex_string(bytes.begin(), bytes.end(), hex_str);
+}
+
+template <typename InIter>
+std::string bytes_to_hex_string(InIter first, InIter last) {
+ std::string hex_str;
+ bytes_to_hex_string(first, last, hex_str);
+ return hex_str;
+}
+
+template <typename InContainer>
+std::string bytes_to_hex_string(const InContainer& bytes) {
+ std::string hex_str;
+ bytes_to_hex_string(bytes, hex_str);
+ return hex_str;
+}
+
+class hash256_one_by_one {
+ public:
+ hash256_one_by_one() { init(); }
+
+ void init() {
+ buffer_.clear();
+ std::fill(data_length_digits_, data_length_digits_ + 4, 0);
+ std::copy(detail::initial_message_digest,
+ detail::initial_message_digest + 8, h_);
+ }
+
+ template <typename RaIter>
+ void process(RaIter first, RaIter last) {
+ add_to_data_length(std::distance(first, last));
+ std::copy(first, last, std::back_inserter(buffer_));
+ std::size_t i = 0;
+ for (; i + 64 <= buffer_.size(); i += 64) {
+ detail::hash256_block(h_, buffer_.begin() + i,
+ buffer_.begin() + i + 64);
+ }
+ buffer_.erase(buffer_.begin(), buffer_.begin() + i);
+ }
+
+ void finish() {
+ byte_t temp[64];
+ std::fill(temp, temp + 64, 0);
+ std::size_t remains = buffer_.size();
+ std::copy(buffer_.begin(), buffer_.end(), temp);
+ temp[remains] = 0x80;
+
+ if (remains > 55) {
+ std::fill(temp + remains + 1, temp + 64, 0);
+ detail::hash256_block(h_, temp, temp + 64);
+ std::fill(temp, temp + 64 - 4, 0);
+ } else {
+ std::fill(temp + remains + 1, temp + 64 - 4, 0);
+ }
+
+ write_data_bit_length(&(temp[56]));
+ detail::hash256_block(h_, temp, temp + 64);
+ }
+
+ template <typename OutIter>
+ void get_hash_bytes(OutIter first, OutIter last) const {
+ for (const word_t* iter = h_; iter != h_ + 8; ++iter) {
+ for (std::size_t i = 0; i < 4 && first != last; ++i) {
+ *(first++) = detail::mask_8bit(
+ static_cast<byte_t>((*iter >> (24 - 8 * i))));
+ }
+ }
+ }
+
+ private:
+ void add_to_data_length(word_t n) {
+ word_t carry = 0;
+ data_length_digits_[0] += n;
+ for (std::size_t i = 0; i < 4; ++i) {
+ data_length_digits_[i] += carry;
+ if (data_length_digits_[i] >= 65536u) {
+ carry = data_length_digits_[i] >> 16;
+ data_length_digits_[i] &= 65535u;
+ } else {
+ break;
+ }
+ }
+ }
+ void write_data_bit_length(byte_t* begin) {
+ word_t data_bit_length_digits[4];
+ std::copy(data_length_digits_, data_length_digits_ + 4,
+ data_bit_length_digits);
+
+ // convert byte length to bit length (multiply 8 or shift 3 times left)
+ word_t carry = 0;
+ for (std::size_t i = 0; i < 4; ++i) {
+ word_t before_val = data_bit_length_digits[i];
+ data_bit_length_digits[i] <<= 3;
+ data_bit_length_digits[i] |= carry;
+ data_bit_length_digits[i] &= 65535u;
+ carry = (before_val >> (16 - 3)) & 65535u;
+ }
+
+ // write data_bit_length
+ for (int i = 3; i >= 0; --i) {
+ (*begin++) = static_cast<byte_t>(data_bit_length_digits[i] >> 8);
+ (*begin++) = static_cast<byte_t>(data_bit_length_digits[i]);
+ }
+ }
+ std::vector<byte_t> buffer_;
+ word_t data_length_digits_[4]; // as 64bit integer (16bit x 4 integer)
+ word_t h_[8];
+};
+
+inline void get_hash_hex_string(const hash256_one_by_one& hasher,
+ std::string& hex_str) {
+ byte_t hash[k_digest_size];
+ hasher.get_hash_bytes(hash, hash + k_digest_size);
+ return bytes_to_hex_string(hash, hash + k_digest_size, hex_str);
+}
+
+inline std::string get_hash_hex_string(const hash256_one_by_one& hasher) {
+ std::string hex_str;
+ get_hash_hex_string(hasher, hex_str);
+ return hex_str;
+}
+
+namespace impl {
+template <typename RaIter, typename OutIter>
+void hash256_impl(RaIter first, RaIter last, OutIter first2, OutIter last2, int,
+ std::random_access_iterator_tag) {
+ hash256_one_by_one hasher;
+ // hasher.init();
+ hasher.process(first, last);
+ hasher.finish();
+ hasher.get_hash_bytes(first2, last2);
+}
+
+template <typename InputIter, typename OutIter>
+void hash256_impl(InputIter first, InputIter last, OutIter first2,
+ OutIter last2, int buffer_size, std::input_iterator_tag) {
+ std::vector<byte_t> buffer(buffer_size);
+ hash256_one_by_one hasher;
+ // hasher.init();
+ while (first != last) {
+ int size = buffer_size;
+ for (int i = 0; i != buffer_size; ++i, ++first) {
+ if (first == last) {
+ size = i;
+ break;
+ }
+ buffer[i] = *first;
+ }
+ hasher.process(buffer.begin(), buffer.begin() + size);
+ }
+ hasher.finish();
+ hasher.get_hash_bytes(first2, last2);
+}
+}
+
+template <typename InIter, typename OutIter>
+void hash256(InIter first, InIter last, OutIter first2, OutIter last2,
+ int buffer_size = PICOSHA2_BUFFER_SIZE_FOR_INPUT_ITERATOR) {
+ picosha2::impl::hash256_impl(
+ first, last, first2, last2, buffer_size,
+ typename std::iterator_traits<InIter>::iterator_category());
+}
+
+template <typename InIter, typename OutContainer>
+void hash256(InIter first, InIter last, OutContainer& dst) {
+ hash256(first, last, dst.begin(), dst.end());
+}
+
+template <typename InContainer, typename OutIter>
+void hash256(const InContainer& src, OutIter first, OutIter last) {
+ hash256(src.begin(), src.end(), first, last);
+}
+
+template <typename InContainer, typename OutContainer>
+void hash256(const InContainer& src, OutContainer& dst) {
+ hash256(src.begin(), src.end(), dst.begin(), dst.end());
+}
+
+template <typename InIter>
+void hash256_hex_string(InIter first, InIter last, std::string& hex_str) {
+ byte_t hashed[k_digest_size];
+ hash256(first, last, hashed, hashed + k_digest_size);
+ std::ostringstream oss;
+ output_hex(hashed, hashed + k_digest_size, oss);
+ hex_str.assign(oss.str());
+}
+
+template <typename InIter>
+std::string hash256_hex_string(InIter first, InIter last) {
+ std::string hex_str;
+ hash256_hex_string(first, last, hex_str);
+ return hex_str;
+}
+
+inline void hash256_hex_string(const std::string& src, std::string& hex_str) {
+ hash256_hex_string(src.begin(), src.end(), hex_str);
+}
+
+template <typename InContainer>
+void hash256_hex_string(const InContainer& src, std::string& hex_str) {
+ hash256_hex_string(src.begin(), src.end(), hex_str);
+}
+
+template <typename InContainer>
+std::string hash256_hex_string(const InContainer& src) {
+ return hash256_hex_string(src.begin(), src.end());
+}
+
+} // namespace picosha2
+
+#endif // PICOSHA2_H
\ No newline at end of file