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Class iaik.asn1.ASN1

java.lang.Object
   |
   +----iaik.asn1.ASN1

public class ASN1

extends Object

DER

Global value for ASN.1 coding format DER.

PEM

Global value for ASN.1 coding format PEM.

startLine

First line of a file in PEM format.

ASN1()

Default constructor.

ASN1(ASN1Object)

Creates an ASN1 object from the internal ASN1Object representation.

ASN1(byte[])

Creates an ASN1Object from a byte array.

ASN1(InputStream)

Creates an ASN1 object from an InputStream.

ASN1(String)

Creates an ASN1 object from a file.

countComponents()

Returns the number of components in this ASN1Object.

fingerprint()

Returns a fingerprint (MD5 Hash of the whole ASN1Object).

getComponentAt(int)

Returns the ASN1Object at index if the ASN1Object is a SEQUENCE.

getFirstObject()

Returns the first object of the first sequence.

saveFormat()

Returns the file format: ASN1.DER, ASN1.PEM.

saveToFile(String)

Saves the ASN1Object to a DER file.

saveToFile(String, String, String)

Saves the ASN1Object to a PEM file.

toASN1Object()

Returns the ASN1Object.

toByteArray(int)

Returns the ASN1Object in DER format.

toString()

Returns a string that represents the contents of this ASN1Object.

 public static final int DER

Global value for ASN.1 coding format DER.

 public static final int PEM

Global value for ASN.1 coding format PEM.

 public static String startLine

First line of a file in PEM format. ASN(String fileName) first tries to find a line which starts with startLine and then reads the following ASN.1 object.

 public ASN1()

Default constructor. Creates an empty object.

 public ASN1(ASN1Object obj) throws CodingException

Creates an ASN1 object from the internal ASN1Object representation.

Parameters:

obj - the ASN1Object

Throws: CodingException

if the ASN1Object could not be DER encoded

 public ASN1(String fileName) throws IOException, CodingException

Creates an ASN1 object from a file. The format of the file could be PEM or DER. If the format is PEM the ASN1. object following the startLine is read from the file.

Parameters:

fileName - the name of the file

Throws: IOException

if there is a problem with the file

Throws: CodingException

if the object could not be decoded

 public ASN1(InputStream is) throws IOException, CodingException

Creates an ASN1 object from an InputStream. The data can be in DER or PEM format. To decide if the data is DER or PEM encoded this method uses the first byte of data: If the first byte has the value: 65-77, 103-122 the format is PEM. Otherwise the format is DER. DER uses the tags 1-24, 48, 49, and 128-. These values PEM encoded result in (65-77, 103-122) and thats why the algorithm should work :).

Parameters:

is - the InputStream containing the data

Throws: IOException

if there is a problem with the InputStream

Throws: CodingException

if the object could not be decoded

 public ASN1(byte array[]) throws CodingException

Creates an ASN1Object from a byte array. The format of the array could be PEM or DER.

Parameters:

array - the byte array containing the object

Throws: CodingException

if the object could not be decoded

 public ASN1Object getComponentAt(int index) throws CodingException

Returns the ASN1Object at index if the ASN1Object is a SEQUENCE.

Parameters:

index - position in the sequence

Returns:

the ASN1Object at this position

Throws: CodingException

if this ASN1Object does not support getComponentAt(int) or to indicate that the index is illegal

 public int countComponents() throws CodingException

Returns the number of components in this ASN1Object. Only useful with a SEQUENCE.

Returns:

the number of components in this ASN1Object

Throws: CodingException

if this ASN1Object does not support countComponents()

 public byte[] getFirstObject() throws CodingException

Returns the first object of the first sequence. To get the signed data from the original data. Otherwise the signature could be different.

Returns:

the data of the (signed) first object

Throws: CodingException

if there is no first object

 public byte[] toByteArray(int format)

Returns the ASN1Object in DER format.

Returns:

the ASN1Object in DER format

 public void saveToFile(String fileName) throws IOException

Saves the ASN1Object to a DER file.

Parameters:

fileName - the name of the file

Throws: IOException

if there is a problem with the file

 public void saveToFile(String fileName,
                        String begin,
                        String end) throws IOException

Saves the ASN1Object to a PEM file.

Parameters:

fileName - the name of the file

begin - the first line of the file

end - the last line of the file

Throws: IOException

if there is a problem with the file

 public int saveFormat()

Returns the file format: ASN1.DER, ASN1.PEM.

Returns:

the file format

 public String toString()

Returns a string that represents the contents of this ASN1Object.

Returns:

the string representation

Overrides:

toString in class Object

 public ASN1Object toASN1Object()

Returns the ASN1Object.

Returns:

the ASN1Object

 public byte[] fingerprint()

Returns a fingerprint (MD5 Hash of the whole ASN1Object).

Returns:

the fingerprint

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