org.cryptacular.util

Class PemUtil

java.lang.Object

org.cryptacular.util.PemUtil

public final class PemUtil
extends java.lang.Object

Utility class with helper methods for common PEM encoding operations.

Field Summary

Fields

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

Constructor Summary

Constructors

Modifier	Constructor and Description
private	PemUtil() Private constructor of utility class.

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(java.lang.String pem) Decodes a PEM-encoded cryptographic object into the raw bytes of its 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.
private static void	writeLine(java.nio.CharBuffer line, java.nio.CharBuffer output) Copies a non-header line to the output buffer.

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 java.lang.String HEADER_BEGIN

PEM encoding header start string.

See Also:

Constant Field Values

FOOTER_END

public static final java.lang.String FOOTER_END

PEM encoding footer start string.

See Also:

Constant Field Values

PROC_TYPE

public static final java.lang.String PROC_TYPE

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

See Also:

Constant Field Values

DEK_INFO

public static final java.lang.String DEK_INFO

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

See Also:

Constant Field Values

Constructor Detail

PemUtil

private PemUtil()

Private constructor of utility class.

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(java.lang.String 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 - PEM-encoded data to decode.

Returns:

ASN.1 encoded bytes.

writeLine

private static void writeLine(java.nio.CharBuffer line,
                              java.nio.CharBuffer output)

Copies a non-header line to the output buffer.

Parameters:

line - Line to consider writing.

output - Output buffer.