com.google.enterprise.connector.util

Class BasicChecksumGenerator

java.lang.Object

com.google.enterprise.connector.util.BasicChecksumGenerator

All Implemented Interfaces:

ChecksumGenerator

Direct Known Subclasses:

Base64ChecksumGenerator

public class BasicChecksumGenerator
extends java.lang.Object
implements ChecksumGenerator

An implementation of ChecksumGenerator that return hexadecimal-encoded checksums using algorithms from java.security.MessageDigest.

Since:

2.8

See Also:

MessageDigest

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	MD2 The MD2 message digest algorithm as defined in RFC 1319.
static java.lang.String	MD5 The MD5 message digest algorithm as defined in RFC 1321.
static java.lang.String	SHA1 The Secure Hash Algorithm, as defined in NIST FIPS 180-1.
static java.lang.String	SHA256 The Secure Hash Algorithm, as defined in NIST FIPS 180-2.
static java.lang.String	SHA384 The Secure Hash Algorithm, as defined in NIST FIPS 180-2.
static java.lang.String	SHA512 The Secure Hash Algorithm, as defined in NIST FIPS 180-2.

Constructor Summary

Constructors

Constructor and Description
BasicChecksumGenerator(java.lang.String algorithm) Constructs a BasicChecksumGenerator that uses the specified message digest algorithm.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getChecksum(java.io.InputStream in) Returns a hexadecimal string representation of the message digest checksum of the input stream.
java.lang.String	getChecksum(java.lang.String input) Returns a hexadecimal string representation of the message digest checksum of the input string.

Methods inherited from class java.lang.Object

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

Field Detail

MD2

public static final java.lang.String MD2

The MD2 message digest algorithm as defined in RFC 1319.

See Also:

Constant Field Values

MD5

public static final java.lang.String MD5

The MD5 message digest algorithm as defined in RFC 1321.

See Also:

Constant Field Values

SHA1

public static final java.lang.String SHA1

The Secure Hash Algorithm, as defined in NIST FIPS 180-1.

See Also:

Constant Field Values

SHA256

public static final java.lang.String SHA256

The Secure Hash Algorithm, as defined in NIST FIPS 180-2. SHA-256 is a 256-bit hash function intended to provide 128 bits of security against collision attacks.

See Also:

Constant Field Values

SHA384

public static final java.lang.String SHA384

The Secure Hash Algorithm, as defined in NIST FIPS 180-2. A 384-bit hash may be obtained by truncating the SHA-512 output.

See Also:

Constant Field Values

SHA512

public static final java.lang.String SHA512

The Secure Hash Algorithm, as defined in NIST FIPS 180-2. SHA-512 is a 512-bit hash function intended to provide 256 bits of security.

See Also:

Constant Field Values

Constructor Detail

BasicChecksumGenerator

public BasicChecksumGenerator(java.lang.String algorithm)

Constructs a BasicChecksumGenerator that uses the specified message digest algorithm. The supported algorithms are: "MD2", "MD5", "SHA-1", "SHA-256", "SHA-384", and "SHA-512"

Parameters:

algorithm - message digest algorithm

Method Detail

getChecksum

public java.lang.String getChecksum(java.io.InputStream in)
                             throws java.io.IOException

Returns a hexadecimal string representation of the message digest checksum of the input stream.

Specified by:

getChecksum in interface ChecksumGenerator

Parameters:

in - input stream to create a checksum for

Returns:

a checksum for the bytes of in

Throws:

java.io.IOException

getChecksum

public java.lang.String getChecksum(java.lang.String input)

Returns a hexadecimal string representation of the message digest checksum of the input string.

Specified by:

getChecksum in interface ChecksumGenerator

Parameters:

input - a String to create a checksum for

Returns:

a checksum for the bytes of input