security=> (count byte-arr)
115
tprat...@neuromancer:~$ wc public.der
5 11 294 public.der
your byte-seq does not do what the java version does :)
On Aug 31, 9:19 pm, Sam Hughes <samuel.jenni...@gmail.com> wrote:
> Hey,
>
> I'm trying to write a Clojure security library. My first step is
> porting some working Java code into Clojure. The Java and Clojure
> snippets below are more or less the same, but with the Clojure code,
> I'm getting: "java.security.InvalidKeyException: IOException: null
> [Thrown class java.security.spec.InvalidKeySpecException]," which I
> can't seem to replicate with the Java code.
>
> The goal of the code is to read in a DER file, use it to encrypt a
> "Hello World" message, then output the encrypted message as a new
> file.
>
> Neither of these snippets necessarily follow good coding standards.
> That said, here's the working Java code snippet:
>
> final File keyFile = new File("public.der");
> byte[] encodedKey = new byte[(int) keyFile.length()];
>
> new FileInputStream(keyFile).read(encodedKey);
> final byte[] newEncoded = encodedKey;
>
> final X509EncodedKeySpec keySpec = new X509EncodedKeySpec(newEncoded);
> KeyFactory kf = KeyFactory.getInstance("RSA");
> PublicKey pk = kf.generatePublic(keySpec);
>
> Cipher rsa = Cipher.getInstance("RSA");
> rsa.init(Cipher.ENCRYPT_MODE, pk);
> OutputStream os = new CipherOutputStream(new FileOutputStream
> ("encrypted.rsa"), rsa);
>
> Writer out = new OutputStreamWriter(os);
> out.write("Hello World");
> out.close();
> os.close();
>
> And here's the Exception throwing Clojure code:
>
> (ns security
> (:import
> [java.io File FileInputStream IOException]
> [java.security.spec X509EncodedKeySpec]
> [java.security KeyFactory PublicKey
> KeyPairGenerator NoSuchAlgorithmException KeyPair]
> [javax.crypto KeyGenerator Cipher]))
>
> (defn byte-seq [rdr]
> (let [result (byte (. rdr read))]
> (if (= result -1)
> (do (. rdr close) nil)
> (lazy-seq (cons result (byte-seq rdr))))))
>
> (def stream (new FileInputStream (new File "public.der")))
> (def byte-arr (into-array Byte/TYPE (byte-seq stream)))
> (def pk-spec (new X509EncodedKeySpec byte-arr))
> (def kf (. KeyFactory (getInstance "RSA")))
> (def pk (. kf (generatePublic pk-spec))) ; exception thrown
> here
>
> Does anyone have any suggestion for what could be causing the
> exception? I'm perplexed because, right now, I'm just trying to
> replicate Java code in Clojure -- nothing too fancy.
>
> Thanks a lot,
> Sam
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