Package com.browserup.bup.mitm.util

Class EncryptionUtil

  • public class EncryptionUtil
extends java.lang.Object
    A collection of simple JCA-related utilities.

    • Constructor Summary

      Constructors 
      Constructor Description
      EncryptionUtil()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String getDigitalSignatureType​(java.security.Key signingKey)
      Returns the type of digital signature used with the specified signing key.
      static java.math.BigInteger getRandomBigInteger​(int bits)
      Creates a random BigInteger greater than 0 with the specified number of bits.
      static java.lang.String getSignatureAlgorithm​(java.lang.String messageDigest, java.security.Key signingKey)
      Creates a signature algorithm string using the specified message digest and the encryption type corresponding to the supplied signingKey.
      static boolean isEcKey​(java.security.Key key)
      Returns true if the key is an elliptic curve public or private key.
      static boolean isRsaKey​(java.security.Key key)
      Returns true if the key is an RSA public or private key.
      static boolean isUnlimitedStrengthAllowed()
      Determines if unlimited-strength cryptography is allowed, i.e.
      static java.lang.String readPemStringFromFile​(java.io.File file)
      Convenience method to read PEM data from a file.
      static void writePemStringToFile​(java.io.File file, java.lang.String pemDataToWrite)
      Convenience method to write PEM data to a file.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • EncryptionUtil

        public EncryptionUtil()

    • Method Detail

      • getSignatureAlgorithm

        public static java.lang.String getSignatureAlgorithm​(java.lang.String messageDigest,
                                                     java.security.Key signingKey)
        Creates a signature algorithm string using the specified message digest and the encryption type corresponding to the supplied signingKey. Useful when generating the signature algorithm to be used to sign server certificates using the CA root certificate's signingKey.

        For example, if the root certificate has an RSA private key, and you wish to use the SHA256 message digest, this method will return the string "SHA256withRSA". See the "Signature Algorithms" section of http://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html for a list of JSSE-supported signature algorithms.

        Parameters:
        messageDigest - digest to use to sign the certificate, such as SHA512
        signingKey - private key that will be used to sign the certificate
        Returns:
        a JCA-compatible signature algorithm

      • getDigitalSignatureType

        public static java.lang.String getDigitalSignatureType​(java.security.Key signingKey)
        Returns the type of digital signature used with the specified signing key.
        Parameters:
        signingKey - private key that will be used to sign a certificate (or something else)
        Returns:
        a string representing the digital signature type (ECDSA, RSA, etc.)

      • getRandomBigInteger

        public static java.math.BigInteger getRandomBigInteger​(int bits)
        Creates a random BigInteger greater than 0 with the specified number of bits.
        Parameters:
        bits - number of bits to generate
        Returns:
        random BigInteger

      • isRsaKey

        public static boolean isRsaKey​(java.security.Key key)
        Returns true if the key is an RSA public or private key.
        Parameters:
        key - key
        Returns:
        isRsaKey

      • isEcKey

        public static boolean isEcKey​(java.security.Key key)
        Returns true if the key is an elliptic curve public or private key.
        Parameters:
        key - key
        Returns:
        isEcKey

      • writePemStringToFile

        public static void writePemStringToFile​(java.io.File file,
                                        java.lang.String pemDataToWrite)
        Convenience method to write PEM data to a file. The file will be encoded in the US_ASCII character set.
        Parameters:
        file - file to write to
        pemDataToWrite - PEM data to write to the file

      • readPemStringFromFile

        public static java.lang.String readPemStringFromFile​(java.io.File file)
        Convenience method to read PEM data from a file. The file encoding must be US_ASCII.
        Parameters:
        file - file to read from
        Returns:
        PEM data from file

      • isUnlimitedStrengthAllowed

        public static boolean isUnlimitedStrengthAllowed()
        Determines if unlimited-strength cryptography is allowed, i.e. if this JRE has then the unlimited strength policy files installed.
        Returns:
        true if unlimited strength cryptography is allowed, otherwise false