Package com.itextpdf.text.pdf.security

Class DigestAlgorithms

java.lang.Object

com.itextpdf.text.pdf.security.DigestAlgorithms

public class DigestAlgorithms
extends java.lang.Object

Class that contains a map with the different message digest algorithms.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	RIPEMD160	Algorithm available for signatures since PDF 1.7
static java.lang.String	SHA1	Algorithm available for signatures since PDF 1.3
static java.lang.String	SHA256	Algorithm available for signatures since PDF 1.6
static java.lang.String	SHA384	Algorithm available for signatures since PDF 1.7
static java.lang.String	SHA512	Algorithm available for signatures since PDF 1.7

Constructor Summary

Constructors

Constructor	Description
DigestAlgorithms()

Method Summary

Modifier and Type	Method	Description
static byte[]	digest(java.io.InputStream data, java.lang.String hashAlgorithm, java.lang.String provider)	Creates a hash using a specific digest algorithm and a provider.
static byte[]	digest(java.io.InputStream data, java.security.MessageDigest messageDigest)
static java.lang.String	getAllowedDigests(java.lang.String name)	Returns the id of a digest algorithms that is allowed in PDF, or null if it isn't allowed.
static java.lang.String	getDigest(java.lang.String oid)	Gets the digest name for a certain id
static java.security.MessageDigest	getMessageDigest(java.lang.String hashAlgorithm, java.lang.String provider)	Creates a MessageDigest object that can be used to create a hash.
static java.security.MessageDigest	getMessageDigestFromOid(java.lang.String digestOid, java.lang.String provider)
static java.lang.String	normalizeDigestName(java.lang.String algo)

Methods inherited from class java.lang.Object

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

Field Detail

SHA1

public static final java.lang.String SHA1

Algorithm available for signatures since PDF 1.3

See Also:

Constant Field Values

SHA256

public static final java.lang.String SHA256

Algorithm available for signatures since PDF 1.6

See Also:

Constant Field Values

SHA384

public static final java.lang.String SHA384

Algorithm available for signatures since PDF 1.7

See Also:

Constant Field Values

SHA512

public static final java.lang.String SHA512

Algorithm available for signatures since PDF 1.7

See Also:

Constant Field Values

RIPEMD160

public static final java.lang.String RIPEMD160

Algorithm available for signatures since PDF 1.7

See Also:

Constant Field Values

Constructor Detail

DigestAlgorithms

public DigestAlgorithms()

Method Detail

getMessageDigestFromOid

public static java.security.MessageDigest getMessageDigestFromOid(java.lang.String digestOid,
                                                                  java.lang.String provider)
                                                           throws java.security.NoSuchAlgorithmException,
                                                                  java.security.NoSuchProviderException

Throws:

java.security.NoSuchAlgorithmException

java.security.NoSuchProviderException

getMessageDigest

public static java.security.MessageDigest getMessageDigest(java.lang.String hashAlgorithm,
                                                           java.lang.String provider)
                                                    throws java.security.NoSuchAlgorithmException,
                                                           java.security.NoSuchProviderException

Creates a MessageDigest object that can be used to create a hash.

Parameters:

hashAlgorithm - the algorithm you want to use to create a hash

provider - the provider you want to use to create the hash

Returns:

a MessageDigest object

Throws:

java.security.NoSuchAlgorithmException

java.security.NoSuchProviderException

java.security.GeneralSecurityException

digest

public static byte[] digest(java.io.InputStream data,
                            java.lang.String hashAlgorithm,
                            java.lang.String provider)
                     throws java.security.GeneralSecurityException,
                            java.io.IOException

Creates a hash using a specific digest algorithm and a provider.

Parameters:

data - the message of which you want to create a hash

hashAlgorithm - the algorithm used to create the hash

provider - the provider used to create the hash

Returns:

the hash

Throws:

java.security.GeneralSecurityException

java.io.IOException

digest

public static byte[] digest(java.io.InputStream data,
                            java.security.MessageDigest messageDigest)
                     throws java.security.GeneralSecurityException,
                            java.io.IOException

Throws:

java.security.GeneralSecurityException

java.io.IOException

getDigest

public static java.lang.String getDigest(java.lang.String oid)

Gets the digest name for a certain id

Parameters:

oid - an id (for instance "1.2.840.113549.2.5")

Returns:

a digest name (for instance "MD5")

normalizeDigestName

public static java.lang.String normalizeDigestName(java.lang.String algo)

getAllowedDigests

public static java.lang.String getAllowedDigests(java.lang.String name)

Returns the id of a digest algorithms that is allowed in PDF, or null if it isn't allowed.

Parameters:

name - the name of the digest algorithm

Returns:

an oid