CiphersInPython/RailFence.py at master · certix7/CiphersInPython · GitHub

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import re


def cipher_encryption():
    msg = input("Enter message: ")
    rails = int(input("Enter number of rails: "))

    # removing white space from message
    msg = msg.replace(" ", "")

    # creating an empty matrix
    railMatrix = []
    for i in range(rails):
        railMatrix.append([])
    for row in range(rails):
        for column in range(len(msg)):
            railMatrix[row].append('.')
        # inner for
    # for

    # testing the matrix
    # for row in railMatrix:
    #     for column in row:
    #         print(column, end="")
    #     print("\n")
    #     # inner for
    # # for

    # putting letters of message one by one in the matrix in zig-zag
    row = 0
    check = 0
    for i in range(len(msg)):
        if check == 0:
            railMatrix[row][i] = msg[i]
            row += 1
            if row == rails:
                check = 1
                row -= 1
            # inner if
        elif check == 1:
            row -= 1
            railMatrix[row][i] = msg[i]
            if row == 0:
                check = 0
                row = 1
            # inner if
        # if-else

    # testing the matrix with message in zig-zag
    # for row in railMatrix:
    #     for column in row:
    #         print(column, end="")
    #     print("\n")
    #     # inner for
    # # for

    encryp_text = ""
    for i in range(rails):
        for j in range(len(msg)):
            encryp_text += railMatrix[i][j]
    # for

    # removing '.' from encrypted text
    encryp_text = re.sub(r"\.", "", encryp_text)
    print("Encrypted Text: {}".format(encryp_text))


def cipher_decryption():
    msg = input("Enter message: ")
    rails = int(input("Enter number of rails: "))

    # removing white space from message
    msg = msg.replace(" ", "")

    # creating an empty matrix
    railMatrix = []
    for i in range(rails):
        railMatrix.append([])
    for row in range(rails):
        for column in range(len(msg)):
            railMatrix[row].append('.')
        # inner for
    # for

    # testing the matrix
    # for row in railMatrix:
    #     for column in row:
    #         print(column, end="")
    #     print("\n")
    #     # inner for
    # # for

    # putting letters of message one by one in the matrix in zig-zag
    row = 0
    check = 0
    for i in range(len(msg)):
        if check == 0:
            railMatrix[row][i] = msg[i]
            row += 1
            if row == rails:
                check = 1
                row -= 1
                # inner if
        elif check == 1:
            row -= 1
            railMatrix[row][i] = msg[i]
            if row == 0:
                check = 0
                row = 1
            # inner if
        # if-else

    # testing the matrix with message in zig-zag
    # for row in railMatrix:
    #     for column in row:
    #         print(column, end="")
    #     print("\n")
    #     # inner for
    # # for

    # reordering the matrix
    ordr = 0
    for i in range(rails):
        for j in range(len(msg)):
            temp = railMatrix[i][j]
            if re.search("\\.", temp):
                # skipping '.'
                continue
            else:
                railMatrix[i][j] = msg[ordr]
                ordr += 1
            # if-else
        # inner for
    # for

    # testing matrix reorder
    for i in railMatrix:
        for column in i:
            print(column, end="")
        #inner for
        print("\n")
    # for

    # putting reordered matrix into decrypted text string to get decrypted text
    check = 0
    row = 0
    decryp_text = ""
    for i in range(len(msg)):
        if check == 0:
            decryp_text += railMatrix[row][i]
            row += 1
            if row == rails:
                check = 1
                row -= 1
            # inner if
        elif check == 1:
            row -= 1
            decryp_text += railMatrix[row][i]
            if row == 0:
                check = 0
                row = 1
            # inner if
        # if-else
    # for

    decryp_text = re.sub(r"\.", "", decryp_text)
    print("Decrypted Text: {}".format(decryp_text))


def main():
    choice = int(input("1. Encryption\n2. Decryption\nChoose(1,2): "))
    if choice == 1:
        print("---Encryption---")
        cipher_encryption()
    elif choice == 2:
        print("---Decryption---")
        cipher_decryption()
    else:
        print("Invalid Choice")

if __name__ == "__main__":
    main()