function
Library: Blowfish (OMFFBLOWFISH)
Import : omffblowfish.xmd |
Returns: A scannable input source for streaming data |
export string source function reader-decrypt from value string source input-data with-key value string encryption-key trimming-mode value trimming-mode-type trimming-mode optional elsewhere
Use reader-decrypt
to read a string source
, its first argument, and
decrypt it using an encryption key, its second argument. The decrypted
data is returned as a string source
that can be further processed.
Note that the Blowfish algorithm processes data in 64-bit chunks. If
the length of input-data
is not a multiple of 64 bits, it will be
padded with null bytes. Similarly, the length of the data generated by
reader-decrypt
will be a multiple of 64 bits, and may therefore be
null padded.
The optional third argument can be used to specify if the null padding should be removed. The default behavior is not to trim the null bytes. If their trimming is desired, you should specify trimming-mode null-trimming
as the third argument.
To use reader-decrypt
, you must import OMFFBLOWFISH.XMD into your
program using a statement like this:
import "omffblowfish.xmd" prefixed by blowfish.
(Please see the import topic for more on importing.)
import "omffblowfish.xmd" prefixed by blowfish. process local string encryption-key initial { "ENCRYPTION KEY" } set file "clear.txt" to blowfish.reader-decrypt from file "cypher.txt" with-key encryption-key trimming-mode null-trimming