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  1. # your code goes here
  2. """ base58 encoding / decoding functions """
  3. import unittest
  4.  
  5. alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
  6. base_count = len(alphabet)
  7.  
  8. def encode(num):
  9. """ Returns num in a base58-encoded string """
  10. encode = ''
  11.  
  12. if (num < 0):
  13. return ''
  14.  
  15. while (num >= base_count):
  16. mod = num % base_count
  17. encode = alphabet[mod] + encode
  18. num = num / base_count
  19.  
  20. if (num):
  21. encode = alphabet[num] + encode
  22.  
  23. return encode
  24.  
  25. def decode(s):
  26. """ Decodes the base58-encoded string s into an integer """
  27. decoded = 0
  28. multi = 1
  29. s = s[::-1]
  30. for char in s:
  31. decoded += multi * alphabet.index(char)
  32. multi = multi * base_count
  33.  
  34. return decoded
  35.  
  36. class Base58Tests(unittest.TestCase):
  37.  
  38. def test_alphabet_length(self):
  39. self.assertEqual(58, len(alphabet))
  40.  
  41. def test_encode_10002343_returns_Tgmc(self):
  42. result = encode(10002343)
  43. self.assertEqual('Tgmc', result)
  44.  
  45. def test_decode_Tgmc_returns_10002343(self):
  46. decoded = decode('Tgmc')
  47. self.assertEqual(10002343, decoded)
  48.  
  49. def test_encode_1000_returns_if(self):
  50. result = encode(1000)
  51. self.assertEqual('if', result)
  52.  
  53. def test_decode_if_returns_1000(self):
  54. decoded = decode('if')
  55. self.assertEqual(1000, decoded)
  56.  
  57. def test_encode_zero_returns_empty_string(self):
  58. self.assertEqual('', encode(0))
  59.  
  60. def test_encode_negative_number_returns_empty_string(self):
  61. self.assertEqual('', encode(-100))
  62.  
  63. if __name__ == '__main__':
  64. #print encode(int("00B94BA6C51B3D8372D82FDE5DC78773D960B5A82FCDAC8181",16))
  65. print hex(decode("Wh4bh"))
Success #stdin #stdout 0.02s 7920KB
stdin
import hmac
import hashlib
import numpy as np

# Provided values
server_seed = "bd8c9006eb65df9efe0061723c696dc00a9e07ec2e02d7307bfdf3020468356a"
client_seed = "fJx1cbhdLq"
nonce = "112"

# Combine client seed and nonce
message = f"{client_seed}-{nonce}".encode()

# Calculate HMAC-SHA256
hmac_hash = hmac.new(server_seed.encode(), message, hashlib.sha256).hexdigest()

# Convert HMAC hash to a sequence of numbers between 0 and 1
hash_bytes = bytes.fromhex(hmac_hash)
num_positions = 25  # For a 5x5 grid

# Generate random numbers from the hash bytes
random_numbers = np.array([int(hash_bytes[i:i+2].hex(), 16) / 65535 for i in range(0, len(hash_bytes), 2)])

# Use the first 25 random numbers for the 5x5 grid (25 positions)
random_numbers = random_numbers[:num_positions]

# Map numbers to mine positions
mine_positions = (random_numbers > 0.5).astype(int)

# Reshape the result to fit a 5x5 grid
mine_grid = mine_positions.reshape((5, 5))
print(mine_grid)
stdout
0x1406e058