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JCA, Cryptography for Java Programmer

JCA, Cryptography for Java Programmer. Shawn Shuang Zhang CS 627. Cryptography Users. Application. End User. PGP, SSL. Integration. Programmer. ?. Development. Cryptographer. Math, SPI. JCA. Figure 1-1. [1] Page 30 Figure 3-1. JCE. Java Cryptography Extension. Providers.

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JCA, Cryptography for Java Programmer

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  1. JCA, Cryptography for Java Programmer Shawn Shuang Zhang CS 627

  2. Cryptography Users Application End User PGP, SSL Integration Programmer ? Development Cryptographer Math, SPI

  3. JCA Figure 1-1. [1] Page 30 Figure 3-1

  4. JCE • Java Cryptography Extension

  5. Providers • Cipher API • Cipher SPI

  6. Restrictions

  7. SunJCE • RSA • DES • Triple DES • MD5 • SHA-1 • Hmac with MD5 • Hamc with SHA-1

  8. Cryptix • LIKI91 • Triple DES • DES2X • DESX • IDEA • RC2 • RC4 • Blowfish • CAST5 • SPEED • SQUARE

  9. IAIK-ICE • RSA • Triple DES • IDEA • RC2 • RC4 • MD2 • MD5 • SHA-1 • Hmac with MD5 • Hmac with SHA-1 • CAST5 • GOST

  10. Example • Get a Cipher • Public static Cipher getInstance(String algorithm, String provider) throws NoSuchAlgorithmException • Cipher cipher=Cipher.getInstance(“DEC”)

  11. Initialize a Cipher • ENCRYPT_MODE • DECRYPT_MODE • Public final void init(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException • Cipher.init(Cipher.ENCRYPT_MODE, Key);

  12. Feed the data • Public final byte[] update(byte[] input) throws IllegalStateException • Byte[] ciphertext=cipher.update(plaintext)

  13. doFinal • Public final byte[] doFinal() IllegalStateException, IllegalBlockSizeException, BadpaddingExceptioin • Byte[] ciphertext=cipher.doFinal();

  14. Example Cipher cipher=Cipher.getInstance(“DES/CBC/PKCS5Padding”); cipher.init(Cipher.ENCRYPT_MODE, key); Byte[] palintext=“plain”.getBytes(); Byte[] step=cipher.update(plaintext); Byte[] ciphertext=cipher.doFinal(plaintext);

  15. References • Java Cryptography by Jonathan Knudsen • Internet Cryptography by Richard E. Smith • http://java.sun.com/products/jsk/1.4/jce • http://www.systemics.com/software/cryptix-java • http://wwwjce.iaik.tu-graz.ac.at/

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