third_party/picosha2/picosha2.h

   1 /*
   2 The MIT License (MIT)
   3
   4 Copyright (C) 2017 okdshin
   5
   6 Permission is hereby granted, free of charge, to any person obtaining a copy
   7 of this software and associated documentation files (the "Software"), to deal
   8 in the Software without restriction, including without limitation the rights
   9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 copies of the Software, and to permit persons to whom the Software is
  11 furnished to do so, subject to the following conditions:
  12
  13 The above copyright notice and this permission notice shall be included in
  14 all copies or substantial portions of the Software.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 THE SOFTWARE.
  23 */
  24 #ifndef PICOSHA2_H
  25 #define PICOSHA2_H
  26 // picosha2:20140213
  27
  28 #ifndef PICOSHA2_BUFFER_SIZE_FOR_INPUT_ITERATOR
  29 #define PICOSHA2_BUFFER_SIZE_FOR_INPUT_ITERATOR \
  30     1048576  //=1024*1024: default is 1MB memory
  31 #endif
  32
  33 #include <algorithm>
  34 #include <cassert>
  35 #include <iterator>
  36 #include <sstream>
  37 #include <vector>
  38 #include <fstream>
  39 namespace picosha2 {
  40 typedef unsigned long word_t;
  41 typedef unsigned char byte_t;
  42
  43 static const size_t k_digest_size = 32;
  44
  45 namespace detail {
  46 inline byte_t mask_8bit(byte_t x) { return x & 0xff; }
  47
  48 inline word_t mask_32bit(word_t x) { return x & 0xffffffff; }
  49
  50 const word_t add_constant[64] = {
  51     0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
  52     0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
  53     0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
  54     0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  55     0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
  56     0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
  57     0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
  58     0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  59     0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
  60     0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
  61     0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
  62
  63 const word_t initial_message_digest[8] = {0x6a09e667, 0xbb67ae85, 0x3c6ef372,
  64                                           0xa54ff53a, 0x510e527f, 0x9b05688c,
  65                                           0x1f83d9ab, 0x5be0cd19};
  66
  67 inline word_t ch(word_t x, word_t y, word_t z) { return (x & y) ^ ((~x) & z); }
  68
  69 inline word_t maj(word_t x, word_t y, word_t z) {
  70     return (x & y) ^ (x & z) ^ (y & z);
  71 }
  72
  73 inline word_t rotr(word_t x, std::size_t n) {
  74     assert(n < 32);
  75     return mask_32bit((x >> n) | (x << (32 - n)));
  76 }
  77
  78 inline word_t bsig0(word_t x) { return rotr(x, 2) ^ rotr(x, 13) ^ rotr(x, 22); }
  79
  80 inline word_t bsig1(word_t x) { return rotr(x, 6) ^ rotr(x, 11) ^ rotr(x, 25); }
  81
  82 inline word_t shr(word_t x, std::size_t n) {
  83     assert(n < 32);
  84     return x >> n;
  85 }
  86
  87 inline word_t ssig0(word_t x) { return rotr(x, 7) ^ rotr(x, 18) ^ shr(x, 3); }
  88
  89 inline word_t ssig1(word_t x) { return rotr(x, 17) ^ rotr(x, 19) ^ shr(x, 10); }
  90
  91 template <typename RaIter1, typename RaIter2>
  92 void hash256_block(RaIter1 message_digest, RaIter2 first, RaIter2 last) {
  93     assert(first + 64 == last);
  94     static_cast<void>(last);  // for avoiding unused-variable warning
  95     word_t w[64];
  96     std::fill(w, w + 64, word_t(0));
  97     for (std::size_t i = 0; i < 16; ++i) {
  98         w[i] = (static_cast<word_t>(mask_8bit(*(first + i * 4))) << 24) |
  99                (static_cast<word_t>(mask_8bit(*(first + i * 4 + 1))) << 16) |
 100                (static_cast<word_t>(mask_8bit(*(first + i * 4 + 2))) << 8) |
 101                (static_cast<word_t>(mask_8bit(*(first + i * 4 + 3))));
 102     }
 103     for (std::size_t i = 16; i < 64; ++i) {
 104         w[i] = mask_32bit(ssig1(w[i - 2]) + w[i - 7] + ssig0(w[i - 15]) +
 105                           w[i - 16]);
 106     }
 107
 108     word_t a = *message_digest;
 109     word_t b = *(message_digest + 1);
 110     word_t c = *(message_digest + 2);
 111     word_t d = *(message_digest + 3);
 112     word_t e = *(message_digest + 4);
 113     word_t f = *(message_digest + 5);
 114     word_t g = *(message_digest + 6);
 115     word_t h = *(message_digest + 7);
 116
 117     for (std::size_t i = 0; i < 64; ++i) {
 118         word_t temp1 = h + bsig1(e) + ch(e, f, g) + add_constant[i] + w[i];
 119         word_t temp2 = bsig0(a) + maj(a, b, c);
 120         h = g;
 121         g = f;
 122         f = e;
 123         e = mask_32bit(d + temp1);
 124         d = c;
 125         c = b;
 126         b = a;
 127         a = mask_32bit(temp1 + temp2);
 128     }
 129     *message_digest += a;
 130     *(message_digest + 1) += b;
 131     *(message_digest + 2) += c;
 132     *(message_digest + 3) += d;
 133     *(message_digest + 4) += e;
 134     *(message_digest + 5) += f;
 135     *(message_digest + 6) += g;
 136     *(message_digest + 7) += h;
 137     for (std::size_t i = 0; i < 8; ++i) {
 138         *(message_digest + i) = mask_32bit(*(message_digest + i));
 139     }
 140 }
 141
 142 }  // namespace detail
 143
 144 template <typename InIter>
 145 void output_hex(InIter first, InIter last, std::ostream& os) {
 146     os.setf(std::ios::hex, std::ios::basefield);
 147     while (first != last) {
 148         os.width(2);
 149         os.fill('0');
 150         os << static_cast<unsigned int>(*first);
 151         ++first;
 152     }
 153     os.setf(std::ios::dec, std::ios::basefield);
 154 }
 155
 156 template <typename InIter>
 157 void bytes_to_hex_string(InIter first, InIter last, std::string& hex_str) {
 158     std::ostringstream oss;
 159     output_hex(first, last, oss);
 160     hex_str.assign(oss.str());
 161 }
 162
 163 template <typename InContainer>
 164 void bytes_to_hex_string(const InContainer& bytes, std::string& hex_str) {
 165     bytes_to_hex_string(bytes.begin(), bytes.end(), hex_str);
 166 }
 167
 168 template <typename InIter>
 169 std::string bytes_to_hex_string(InIter first, InIter last) {
 170     std::string hex_str;
 171     bytes_to_hex_string(first, last, hex_str);
 172     return hex_str;
 173 }
 174
 175 template <typename InContainer>
 176 std::string bytes_to_hex_string(const InContainer& bytes) {
 177     std::string hex_str;
 178     bytes_to_hex_string(bytes, hex_str);
 179     return hex_str;
 180 }
 181
 182 class hash256_one_by_one {
 183    public:
 184     hash256_one_by_one() { init(); }
 185
 186     void init() {
 187         buffer_.clear();
 188         std::fill(data_length_digits_, data_length_digits_ + 4, word_t(0));
 189         std::copy(detail::initial_message_digest,
 190                   detail::initial_message_digest + 8, h_);
 191     }
 192
 193     template <typename RaIter>
 194     void process(RaIter first, RaIter last) {
 195         add_to_data_length(static_cast<word_t>(std::distance(first, last)));
 196         std::copy(first, last, std::back_inserter(buffer_));
 197         std::size_t i = 0;
 198         for (; i + 64 <= buffer_.size(); i += 64) {
 199             detail::hash256_block(h_, buffer_.begin() + i,
 200                                   buffer_.begin() + i + 64);
 201         }
 202         buffer_.erase(buffer_.begin(), buffer_.begin() + i);
 203     }
 204
 205     void finish() {
 206         byte_t temp[64];
 207         std::fill(temp, temp + 64, byte_t(0));
 208         std::size_t remains = buffer_.size();
 209         std::copy(buffer_.begin(), buffer_.end(), temp);
 210         temp[remains] = 0x80;
 211
 212         if (remains > 55) {
 213             std::fill(temp + remains + 1, temp + 64, byte_t(0));
 214             detail::hash256_block(h_, temp, temp + 64);
 215             std::fill(temp, temp + 64 - 4, byte_t(0));
 216         } else {
 217             std::fill(temp + remains + 1, temp + 64 - 4, byte_t(0));
 218         }
 219
 220         write_data_bit_length(&(temp[56]));
 221         detail::hash256_block(h_, temp, temp + 64);
 222     }
 223
 224     template <typename OutIter>
 225     void get_hash_bytes(OutIter first, OutIter last) const {
 226         for (const word_t* iter = h_; iter != h_ + 8; ++iter) {
 227             for (std::size_t i = 0; i < 4 && first != last; ++i) {
 228                 *(first++) = detail::mask_8bit(
 229                     static_cast<byte_t>((*iter >> (24 - 8 * i))));
 230             }
 231         }
 232     }
 233
 234    private:
 235     void add_to_data_length(word_t n) {
 236         word_t carry = 0;
 237         data_length_digits_[0] += n;
 238         for (std::size_t i = 0; i < 4; ++i) {
 239             data_length_digits_[i] += carry;
 240             if (data_length_digits_[i] >= 65536u) {
 241                 carry = data_length_digits_[i] >> 16;
 242                 data_length_digits_[i] &= 65535u;
 243             } else {
 244                 break;
 245             }
 246         }
 247     }
 248     void write_data_bit_length(byte_t* begin) {
 249         word_t data_bit_length_digits[4];
 250         std::copy(data_length_digits_, data_length_digits_ + 4,
 251                   data_bit_length_digits);
 252
 253         // convert byte length to bit length (multiply 8 or shift 3 times left)
 254         word_t carry = 0;
 255         for (std::size_t i = 0; i < 4; ++i) {
 256             word_t before_val = data_bit_length_digits[i];
 257             data_bit_length_digits[i] <<= 3;
 258             data_bit_length_digits[i] |= carry;
 259             data_bit_length_digits[i] &= 65535u;
 260             carry = (before_val >> (16 - 3)) & 65535u;
 261         }
 262
 263         // write data_bit_length
 264         for (int i = 3; i >= 0; --i) {
 265             (*begin++) = static_cast<byte_t>(data_bit_length_digits[i] >> 8);
 266             (*begin++) = static_cast<byte_t>(data_bit_length_digits[i]);
 267         }
 268     }
 269     std::vector<byte_t> buffer_;
 270     word_t data_length_digits_[4];  // as 64bit integer (16bit x 4 integer)
 271     word_t h_[8];
 272 };
 273
 274 inline void get_hash_hex_string(const hash256_one_by_one& hasher,
 275                                 std::string& hex_str) {
 276     byte_t hash[k_digest_size];
 277     hasher.get_hash_bytes(hash, hash + k_digest_size);
 278     return bytes_to_hex_string(hash, hash + k_digest_size, hex_str);
 279 }
 280
 281 inline std::string get_hash_hex_string(const hash256_one_by_one& hasher) {
 282     std::string hex_str;
 283     get_hash_hex_string(hasher, hex_str);
 284     return hex_str;
 285 }
 286
 287 namespace impl {
 288 template <typename RaIter, typename OutIter>
 289 void hash256_impl(RaIter first, RaIter last, OutIter first2, OutIter last2, int,
 290                   std::random_access_iterator_tag) {
 291     hash256_one_by_one hasher;
 292     // hasher.init();
 293     hasher.process(first, last);
 294     hasher.finish();
 295     hasher.get_hash_bytes(first2, last2);
 296 }
 297
 298 template <typename InputIter, typename OutIter>
 299 void hash256_impl(InputIter first, InputIter last, OutIter first2,
 300                   OutIter last2, int buffer_size, std::input_iterator_tag) {
 301     std::vector<byte_t> buffer(buffer_size);
 302     hash256_one_by_one hasher;
 303     // hasher.init();
 304     while (first != last) {
 305         int size = buffer_size;
 306         for (int i = 0; i != buffer_size; ++i, ++first) {
 307             if (first == last) {
 308                 size = i;
 309                 break;
 310             }
 311             buffer[i] = *first;
 312         }
 313         hasher.process(buffer.begin(), buffer.begin() + size);
 314     }
 315     hasher.finish();
 316     hasher.get_hash_bytes(first2, last2);
 317 }
 318 }
 319
 320 template <typename InIter, typename OutIter>
 321 void hash256(InIter first, InIter last, OutIter first2, OutIter last2,
 322              int buffer_size = PICOSHA2_BUFFER_SIZE_FOR_INPUT_ITERATOR) {
 323     picosha2::impl::hash256_impl(
 324         first, last, first2, last2, buffer_size,
 325         typename std::iterator_traits<InIter>::iterator_category());
 326 }
 327
 328 template <typename InIter, typename OutContainer>
 329 void hash256(InIter first, InIter last, OutContainer& dst) {
 330     hash256(first, last, dst.begin(), dst.end());
 331 }
 332
 333 template <typename InContainer, typename OutIter>
 334 void hash256(const InContainer& src, OutIter first, OutIter last) {
 335     hash256(src.begin(), src.end(), first, last);
 336 }
 337
 338 template <typename InContainer, typename OutContainer>
 339 void hash256(const InContainer& src, OutContainer& dst) {
 340     hash256(src.begin(), src.end(), dst.begin(), dst.end());
 341 }
 342
 343 template <typename InIter>
 344 void hash256_hex_string(InIter first, InIter last, std::string& hex_str) {
 345     byte_t hashed[k_digest_size];
 346     hash256(first, last, hashed, hashed + k_digest_size);
 347     std::ostringstream oss;
 348     output_hex(hashed, hashed + k_digest_size, oss);
 349     hex_str.assign(oss.str());
 350 }
 351
 352 template <typename InIter>
 353 std::string hash256_hex_string(InIter first, InIter last) {
 354     std::string hex_str;
 355     hash256_hex_string(first, last, hex_str);
 356     return hex_str;
 357 }
 358
 359 inline void hash256_hex_string(const std::string& src, std::string& hex_str) {
 360     hash256_hex_string(src.begin(), src.end(), hex_str);
 361 }
 362
 363 template <typename InContainer>
 364 void hash256_hex_string(const InContainer& src, std::string& hex_str) {
 365     hash256_hex_string(src.begin(), src.end(), hex_str);
 366 }
 367
 368 template <typename InContainer>
 369 std::string hash256_hex_string(const InContainer& src) {
 370     return hash256_hex_string(src.begin(), src.end());
 371 }
 372 template<typename OutIter>void hash256(std::ifstream& f, OutIter first, OutIter last){
 373     hash256(std::istreambuf_iterator<char>(f), std::istreambuf_iterator<char>(), first,last);
 374
 375 }
 376 }// namespace picosha2
 377 #endif  // PICOSHA2_H