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I am attempting to decrypt a number encrypted by another program that uses the BouncyCastle library for Java.
In Java, I can set the key like this: key = Hex.decode("5F3B603AFCE22359");
I am trying to figure out how to represent that same step in Ruby.
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Strings can be converted to arrays using a combination of the split method and some regular expressions. The split method serves to break up the string into distinct parts that can be placed into array element. The regular expression tells split what to use as the break point during the conversion process.
Converting Strings to Numbers Ruby provides the to_i and to_f methods to convert strings to numbers. to_i converts a string to an integer, and to_f converts a string to a float.
The Encoding. GetBytes() method converts a string into a bytes array. The example below converts a string into a byte array in Ascii format and prints the converted bytes to the console.
To get Integer — just str.hex. You may get byte array in several ways:
str.scan(/../).map(&:hex)
[str].pack('H*').unpack('C*')
[str].pack('H*').bytes.to_a
See other options for pack/unpack here: http://ruby-doc.org/core/classes/String.html#method-i-unpack
And examples here: http://www.codeweblog.com/ruby-string-pack-unpack-detailed-usage/
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