jBase Infobasic Function DECRYPT

The DECRYPT function encrypts strings. see also ENCRYPT

Command Syntax

DECRYPT(string, key, method)

Syntax Elements

string => specifies the string to be encrypted.
key => is the value used to encrypt the string. Its use depends on method.
method => is a value, which indicates the encryption mechanism to use (See below):

The ENCRYPT and DECRYPT functions that are part of jBASE BASIC now support the following cipher methods (Defined in JBC.h)

JBASE_CRYPT_GENERAL	General-purpose encryption scheme
JBASE_CRYPT_ROT13	Simple ROT13 algorithm. (Key not used)
JBASE_CRYPT_XOR11	XOR MOD11 algorithm. Uses the first character of a key as a seed value.
JBASE_CRYPT_RC2	RC2 algorithm
JBASE_CRYPT_DES	DES algorithm
JBASE_CRYPT_3DES	Three Key, Triple DES algorithm
JBASE_CRYPT_BLOWFISH	Blowfish algorithm
JBASE_CRYPT_BASE64	(See below)

BASE64 is not really an encryption method, but more of an encoding. The reason for this is that the output of an encryption often results in a binary string. It allows binary data to be represented as a character string. BASE64 operation is not required but is performed in addition to the primary algorithm. e.g. JBASE_CRYPT_RC2_BASE64 ENCRYPT with this method is the same as a DECRYPT with method JBASE_CRYPT_RC2 followed
by DECRYPT with method JBASE_CRYPT_BASE64. DECRYPT with this method is the same as a DECRYPT with method JBASE_CRYPT_BASE64 followed by DECRYPT with method JBASE_CRYPT_RC2.

JBASE_CRYPT_RC2_BASE64	RC2 algorithm
JBASE_CRYPT_DES_BASE64	DES algorithm
JBASE_CRYPT_3DES_BASE64	Triple DES algorithm
JBASE_CRYPT_BLOWFISH _BASE64	Blowfish algorithm

Example

INCLUDE JBC.h
X = DECRYPT(X, Ekey, JBASE_CRYPT_GENERAL)
IF DECRYPT("rknzcyr”,"", JBASE_CRYPT_ROT13) = "example" THEN
CRT "ROT13 ok"
END
IF ENCRYPT("g{ehvkm","9", JBASE_CRYPT_XOR11) = "example" THEN
CRT "XOR.MOD11 ok"
END
cipher = JBASE_CRYPT_BLOWFISH_BASE64
key = "Our Very Secret Key"
str = "String to encrypt"
enc = ENCRYPT( str, key, cipher )
CRT "Encrypted: ":enc
dec = DECRYPT( enc, key, cipher )
CRT "Decrypted: ":dec

Output

Encrypted: xuy6DXxUkD32spyfsKEvUtXrsjP7mC+R
Decrypted: String to encrypt