DEA64encrypt (String function)

DEA 64-bit key decryption (String class)

This page is under construction.

RC4encrypt and RC4decrypt are synonyms for the String class function that applies the DEA (Data Encryption Algorithm) using a 64-bit symmetric key to encrypt or decrypt each 64-bit block of input text. For more details about how the algorithm works, see Data Encryption Standard.

The length of the returned string is the same as that of the object string.

DEA is a two-way cipher, so encrypting a string with a key and then decrypting the result of that encryption with the same key produces the original string. That is, the following assertion should always hold:

assert %string:dea64encrypt(%key):dea64decrypt(%key) eq %string

You can use RC4decrypt to "document" that you are decrypting, and use RC4encrypt to "document" that you are enrypting. You can use RC4decrypt and RC4encrypt interchangeably on the rest of this page.

Syntax

%outString = string:DEA64encrypt( key) Throws UnsupportedCrypto, InvalidCryptoKey, InvalidCryptoData

%outString = string:DEA64decrypt( key) Throws UnsupportedCrypto, InvalidCryptoKey, InvalidCryptoData

Syntax terms

%outString	A string variable to receive the encrypted or decrypted method object string. Its length is the same as string.
string	The string to which the method is applied. string must be a multiple of eight bytes in length; its maximum is 32768 bytes. It may be null.
key	An 8-byte (only) string variable whose value is used to encrypt or decrypt the method object, string.

Usage notes

• The DEA64encrypt and DEA64decrypt functions are available as of Model 204 7.6.

Examples

In the following example, the output string from the DEA64encrypt method is converted to hex using the StringToHex function to reveal its non-displayable characters, then decrypted to return the original input string:

b %ls is longstring %string is longstring %key is longstring %string = 'onetwothreefour0onetwothreefour0' %key = '12345678' %ls = %string:dea64encrypt(%key) printText {~} is {%ls:stringTohex} printText {~} is: {%ls:rc4decrypt(%key)} end

The result is:

%ls:stringTohex is: A54138C10468C061567574F88567E221A54138C10468C061567574F88567E221 %ls:dea64decrypt(%key) is: onetwothreefour0onetwothreefour0

See also

• DEA128encrypt
• DEA256encrypt

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