def encrypt(message, matrix, encryption=True):
"""
Hill encryption (decryption).
"""
message = message.upper()
if not utils.invertible(matrix):
# The matrix should be invertible.
return "Non invertible matrix"
if len(message) % 2 != 0:
message = message + 'X'
couple = [
list(message[i * 2:(i * 2) + 2]) for i in range(0,
len(message) / 2)
]
result = [i[:] for i in couple]
if not encryption:
# To decrypt, just need to inverse the matrix.
matrix = utils.inverse_matrix(matrix)
for i, c in enumerate(couple):
if c[0].isalpha() and c[1].isalpha():
result[i][0] = chr(((ord(c[0])-65) * matrix[0][0] + \
(ord(c[1])-65) * matrix[0][1]) % 26 + 65)
result[i][1] = chr(((ord(c[0])-65) * matrix[1][0] + \
(ord(c[1])-65) * matrix[1][1]) % 26 + 65)
return "".join(["".join(i) for i in result])
def hill(message, matrix, encryption = False):
import utils
if not utils.invertible(matrix):
# The matrix should be invertible.
raise Exception, "Non invertible matrix. Please enter a matrix that is invertible."
try:
if len(message) % 2 != 0:
message = message + 'X'
couple = [list(message[i*2:(i*2)+2]) for i in range(0, len(message)/2)]
result = [i[:] for i in couple]
if not encryption:
# To decrypt, just need to inverse the matrix.
matrix = utils.inverse_matrix(matrix)
for i, c in enumerate(couple):
if c[0].isalpha() and c[1].isalpha():
result[i][0] = chr(((ord(c[0])-65) * matrix[0][0] + \
(ord(c[1])-65) * matrix[0][1]) % 26 + 65)
result[i][1] = chr(((ord(c[0])-65) * matrix[1][0] + \
(ord(c[1])-65) * matrix[1][1]) % 26 + 65)
return "".join(["".join(i) for i in result])
except:
raise Exception, "Input is not valid. Please enter valid matrix."
def encrypt(message, matrix, encryption=True):
message = message.upper()
if not utils.invertible(matrix):
# The matrix should be invertible.
return "Non invertible matrix"
if len(message) % 2 != 0:
message = message + 'X'
couple = [list(message[i*2:(i*2)+2]) for i in range(0, len(message)/2)]
result = [i[:] for i in couple]
if not encryption:
# To decrypt, just need to inverse the matrix.
matrix = utils.inverse_matrix(matrix)
for i, c in enumerate(couple):
if c[0].isalpha() and c[1].isalpha():
result[i][0] = chr(((ord(c[0])-65) * matrix[0][0] + \
(ord(c[1])-65) * matrix[0][1]) % 26 + 65)
result[i][1] = chr(((ord(c[0])-65) * matrix[1][0] + \
(ord(c[1])-65) * matrix[1][1]) % 26 + 65)
return "".join(["".join(i) for i in result])
