org.cryptacular.util

Class PemUtil

java.lang.Object

org.cryptacular.util.PemUtil

public final class PemUtil
extends Object

Utility class with helper methods for common PEM encoding operations.

Author:

Middleware Services

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEK_INFO Decryption infor tag for PEM-encoded private key in OpenSSL format.
static String	FOOTER_END PEM encoding footer start string.
static String	HEADER_BEGIN PEM encoding header start string.
static int	LINE_LENGTH Line length.
static String	PROC_TYPE Procedure type tag for PEM-encoded private key in OpenSSL format.

Method Summary

Modifier and Type	Method and Description
static byte[]	decode(byte[] pem) Decodes a PEM-encoded cryptographic object into the raw bytes of its ASN.1 encoding.
static byte[]	decode(String pem) Decodes one or more PEM-encoded cryptographic objects into the raw bytes of their ASN.1 encoding.
static boolean	isBase64Char(byte b) Determines whether the given byte represents an ASCII character in the character set for base64 encoding.
static boolean	isPem(byte[] data) Determines whether the data in the given byte array is base64-encoded data of PEM encoding.

Methods inherited from class java.lang.Object

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

Field Detail

LINE_LENGTH

public static final int LINE_LENGTH

Line length.

See Also:

Constant Field Values

HEADER_BEGIN

public static final String HEADER_BEGIN

PEM encoding header start string.

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Constant Field Values

FOOTER_END

public static final String FOOTER_END

PEM encoding footer start string.

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Constant Field Values

PROC_TYPE

public static final String PROC_TYPE

Procedure type tag for PEM-encoded private key in OpenSSL format.

See Also:

Constant Field Values

DEK_INFO

public static final String DEK_INFO

Decryption infor tag for PEM-encoded private key in OpenSSL format.

See Also:

Constant Field Values

Method Detail

isPem

public static boolean isPem(byte[] data)

Determines whether the data in the given byte array is base64-encoded data of PEM encoding. The determination is made using as little data from the given array as necessary to make a reasonable determination about encoding.

Parameters:

data - Data to test for PEM encoding

Returns:

True if data appears to be PEM encoded, false otherwise.

isBase64Char

public static boolean isBase64Char(byte b)

Determines whether the given byte represents an ASCII character in the character set for base64 encoding.

Parameters:

b - Byte to test.

Returns:

True if the byte represents an ASCII character in the set of valid characters for base64 encoding, false otherwise. The padding character '=' is not considered valid since it may only appear at the end of a base64 encoded value.

decode

public static byte[] decode(byte[] pem)

Decodes a PEM-encoded cryptographic object into the raw bytes of its ASN.1 encoding. Header/footer data and metadata info, e.g. Proc-Type, are ignored.

Parameters:

pem - Bytes of PEM-encoded data to decode.

Returns:

ASN.1 encoded bytes.

decode

public static byte[] decode(String pem)

Decodes one or more PEM-encoded cryptographic objects into the raw bytes of their ASN.1 encoding. All header and metadata, e.g. Proc-Type, are ignored. If multiple cryptographic objects are represented, the decoded bytes of each object are concatenated together and returned.

Parameters:

pem - PEM-encoded data to decode.

Returns:

ASN.1 encoded bytes.