Scala for Cryptography I on Coursera //google
A simple (initially 5 classes) library for working with Hex / Decimal / Binary data in the Scala REPL or in a program.
Crypto primitives can be applied to Hex / Decimal / Binary data.
The library was developed to complete Dan Boneh's Cryptography I course on Coursera.
Provided under the Apache 2 Licence. Please don't add exercise specific code if you use it for the same purpose.
@marklister Thanks a lot for your tool that saved me a lot of time during the course and allowed me to focus purely on cryptography during assignments. See the pull request #1 and #3 for details.
Simply cloning the project, installing a jdk and sbt will give you a working environment. Run sbt console
from the cloned directory. sbt run will activate the improved ammonite REPL.
To use as a library execute sbt publishLocal
Strings are implicitly converted into BaseN objects. You invoke the h method to convert from Hex d to convert from Decimal and b from binary
Byte arrays are implicitly converted into Objects of type CryptoOps.
You can add subtract multiply divide, xor etc any of your BaseN objects. You can convert them to hex decimal binary or BigInts.
You can encrypt, hash, decrypt, pkspad your converted byte arrays.
The REPL tab key might be useful.
If you are running from the REPL imports are handled automatically. If you are writing a program then include:
import org.github.marklister.basen.BaseN._
import org.github.marklister.basen.CryptoOps._Welcome to Scala 2.12.2 (OpenJDK 64-Bit Server VM, Java 1.8.0_121).
Type in expressions for evaluation. Or try :help.
scala> //working with Hex / Decimal / Binary
import org.github.marklister.basen.BaseN._
import org.github.marklister.basen.CryptoOps._
scala> "255".d
res0: org.github.marklister.basen.Decimal = 000:255 [base: 10]
scala> "ff".h
res1: org.github.marklister.basen.Hex = 00:ff [base: 16]
scala> "10".d * 2
res2: org.github.marklister.basen.BaseN = 020 [base: 10]
scala> "10101010".b xor "01010101".b
res3: org.github.marklister.basen.BaseN = 00000000:11111111 [base: 2]
scala> "2".d + "f".h
res4: org.github.marklister.basen.BaseN = 017 [base: 10]
scala>
scala> //Convert hex to binary
scala> "ff".h.b
res5: org.github.marklister.basen.Binary = 00000000:11111111 [base: 2]
scala>
scala> //Crypto stuff
scala> "Hello".getBytes.h
res6: org.github.marklister.basen.Hex = 48:65:6c:6c:6f [base: 16]
scala> "Hello".getBytes.sha256.h
res7: org.github.marklister.basen.Hex = 18:5f:8d:b3:22:71:fe:25:f5:61:a6:fc:93:8b:2e:26:43:06:ec:30:4e:da:51:80:07:d1:76:48:26:38:19:69 [base: 16]
scala> val encrypted="Hello World".getBytes.pkcs5Pad.aesEncrypt("my key".getBytes.pkcs5Pad)
encrypted: Array[Byte] = Array(-80, 101, 29, 31, 83, -62, 3, 95, -61, -73, -17, -45, -38, -83, 78, 22)
scala> encrypted.aesDecrypt("my key".getBytes.pkcs5Pad).h.toByteArray.map(_.toChar)
res8: Array[Char] = Array(H, e, l, l, o, , W, o, r, l, d, ?, ?, ?, ?, ?)