Sha256: ddc7f2a32ed1a6c8211a26096764dbc4defe55f6cc1ea8ff7e040f75fd005bab
Contents?: true
Size: 1.13 KB
Versions: 9
Compression:
Stored size: 1.13 KB
Contents
module Bitcoin
# Base58Check encoding
# https://en.bitcoin.it/wiki/Base58Check_encoding
module Base58
module_function
ALPHABET = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
SIZE = ALPHABET.size
# encode hex value to base58 string.
def encode(hex)
leading_zero_bytes = (hex.match(/^([0]+)/) ? $1 : '').size / 2
int_val = hex.to_i(16)
base58_val = ''
while int_val > 0
int_val, remainder = int_val.divmod(SIZE)
base58_val = ALPHABET[remainder] + base58_val
end
('1' * leading_zero_bytes) + base58_val
end
# decode base58 string to hex value.
def decode(base58_val)
int_val = 0
base58_val.reverse.split(//).each_with_index do |char,index|
raise ArgumentError, 'Value passed not a valid Base58 String.' if (char_index = ALPHABET.index(char)).nil?
int_val += char_index * (SIZE**index)
end
s = int_val.to_even_length_hex
s = '' if s == '00'
leading_zero_bytes = (base58_val.match(/^([1]+)/) ? $1 : '').size
s = ('00' * leading_zero_bytes) + s if leading_zero_bytes > 0
s
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems