def share_string_to_point(share_string, charset):
""" Convert a share string to a point (a tuple of integers).
"""
# share should be in the format "01-d051080de7..."
if '-' in charset:
raise ValueError('The character "-" cannot be in the supplied charset.')
if not isinstance(share_string, str) and share_string.count('-') == 1:
raise ValueError('Share format is invalid.')
x_string, y_string = share_string.split('-')
if (set(x_string) - set(charset)) or (set(y_string) - set(charset)):
raise ValueError("Share has characters that aren't in the charset.")
x = charset_to_int(x_string, charset)
y = charset_to_int(y_string, charset)
return (x, y)
def share_string_to_point(share_string, charset):
""" Convert a share string to a point (a tuple of integers).
"""
# share should be in the format "01-d051080de7..."
if '-' in charset:
raise ValueError(
'The character "-" cannot be in the supplied charset.')
if not isinstance(share_string, str) and share_string.count('-') == 1:
raise ValueError('Share format is invalid.')
x_string, y_string = share_string.split('-')
if (set(x_string) - set(charset)) or (set(y_string) - set(charset)):
raise ValueError("Share has characters that aren't in the charset.")
x = charset_to_int(x_string, charset)
y = charset_to_int(y_string, charset)
return (x, y)
def split_secret(cls, secret_string, share_threshold, num_shares):
secret_int = charset_to_int(secret_string, cls.secret_charset)
points = secret_int_to_points(secret_int, share_threshold, num_shares)
shares = []
for point in points:
shares.append(point_to_share_string(point, cls.share_charset))
return shares
def split_secret(cls, secret_string, share_threshold, num_shares):
secret_int = charset_to_int(secret_string, cls.secret_charset)
points = secret_int_to_points(secret_int, share_threshold, num_shares)
shares = []
for point in points:
shares.append(point_to_share_string(point, cls.share_charset))
return shares
