org.bouncycastle.openpgp

Class PGPUtil

java.lang.Object

org.bouncycastle.openpgp.PGPUtil

All Implemented Interfaces:

HashAlgorithmTags

public class PGPUtil
extends java.lang.Object
implements HashAlgorithmTags

PGP utilities.

Field Summary

Fields inherited from interface org.bouncycastle.bcpg.HashAlgorithmTags

DOUBLE_SHA, HAVAL_5_160, MD2, MD5, RIPEMD160, SHA1, SHA224, SHA256, SHA384, SHA512, TIGER_192

Constructor Summary

Constructors

Constructor and Description
PGPUtil()

Method Summary

Modifier and Type	Method and Description
static java.io.InputStream	getDecoderStream(java.io.InputStream in) Obtains a stream that can be used to read PGP data from the provided stream.
static java.lang.String	getDefaultProvider() Deprecated. unused
static java.lang.String	getDigestName(int hashAlgorithm) Return an appropriate name for the hash algorithm represented by the passed in hash algorithm ID number.
static java.lang.String	getSignatureName(int keyAlgorithm, int hashAlgorithm) Return an appropriate name for the signature algorithm represented by the passed in public key and hash algorithm ID numbers.
static java.lang.String	getSymmetricCipherName(int algorithm) Return an appropriate name for the symmetric algorithm represented by the passed in symmetric algorithm ID number.
static byte[]	makeRandomKey(int algorithm, java.security.SecureRandom random) Generates a random key for a symmetric encryption algorithm .
static void	setDefaultProvider(java.lang.String provider) Deprecated. unused
static void	writeFileToLiteralData(java.io.OutputStream out, char fileType, java.io.File file) Write out the contents of the provided file as a literal data packet.
static void	writeFileToLiteralData(java.io.OutputStream out, char fileType, java.io.File file, byte[] buffer) Write out the contents of the provided file as a literal data packet in partial packet format.

Methods inherited from class java.lang.Object

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

Constructor Detail

PGPUtil

public PGPUtil()

Method Detail

getDigestName

public static java.lang.String getDigestName(int hashAlgorithm)
                                      throws PGPException

Return an appropriate name for the hash algorithm represented by the passed in hash algorithm ID number.

Parameters:

hashAlgorithm - the algorithm ID for a hash algorithm.

Returns:

a String representation of the hash name.

Throws:

PGPException

getSignatureName

public static java.lang.String getSignatureName(int keyAlgorithm,
                                                int hashAlgorithm)
                                         throws PGPException

Return an appropriate name for the signature algorithm represented by the passed in public key and hash algorithm ID numbers.

Parameters:

keyAlgorithm - the algorithm ID for the public key algorithm used in the signature.

hashAlgorithm - the algorithm ID for the hash algorithm used.

Returns:

a String representation of the signature name.

Throws:

PGPException

getSymmetricCipherName

public static java.lang.String getSymmetricCipherName(int algorithm)

Return an appropriate name for the symmetric algorithm represented by the passed in symmetric algorithm ID number.

Parameters:

algorithm - the algorithm ID for a symmetric cipher.

Returns:

a String representation of the cipher name.

getDefaultProvider

public static java.lang.String getDefaultProvider()

Deprecated. unused

Return the JCA/JCE provider that will be used by factory classes in situations where a provider must be determined on the fly.

Returns:

the name of the default provider.

setDefaultProvider

public static void setDefaultProvider(java.lang.String provider)

Deprecated. unused

Set the provider to be used by the package when it is necessary to find one on the fly.

Parameters:

provider - the name of the JCA/JCE provider to use by default.

makeRandomKey

public static byte[] makeRandomKey(int algorithm,
                                   java.security.SecureRandom random)
                            throws PGPException

Generates a random key for a symmetric encryption algorithm .

Parameters:

algorithm - the symmetric key algorithm identifier.

random - a source of random data.

Returns:

a key of the length required by the specified encryption algorithm.

Throws:

PGPException - if the encryption algorithm is unknown.

writeFileToLiteralData

public static void writeFileToLiteralData(java.io.OutputStream out,
                                          char fileType,
                                          java.io.File file)
                                   throws java.io.IOException

Write out the contents of the provided file as a literal data packet.

Parameters:

out - the stream to write the literal data to.

fileType - the PGPLiteralData type to use for the file data.

file - the file to write the contents of.

Throws:

java.io.IOException - if an error occurs reading the file or writing to the output stream.

writeFileToLiteralData

public static void writeFileToLiteralData(java.io.OutputStream out,
                                          char fileType,
                                          java.io.File file,
                                          byte[] buffer)
                                   throws java.io.IOException

Write out the contents of the provided file as a literal data packet in partial packet format.

Parameters:

out - the stream to write the literal data to.

fileType - the PGPLiteralData type to use for the file data.

file - the file to write the contents of.

buffer - buffer to be used to chunk the file into partial packets.

Throws:

java.io.IOException - if an error occurs reading the file or writing to the output stream.

See Also:

PGPLiteralDataGenerator.open(OutputStream, char, String, Date, byte[]).

getDecoderStream

public static java.io.InputStream getDecoderStream(java.io.InputStream in)
                                            throws java.io.IOException

Obtains a stream that can be used to read PGP data from the provided stream.

If the initial bytes of the underlying stream are binary PGP encodings, then the stream will be returned directly, otherwise an ArmoredInputStream is used to wrap the provided stream and remove ASCII-Armored encoding.

Parameters:

in - the stream to be checked and possibly wrapped.

Returns:

a stream that will return PGP binary encoded data.

Throws:

java.io.IOException - if an error occurs reading the stream, or initalising the ArmoredInputStream.