Package org.xipki.security.util

Class PKCS1Util

java.lang.Object

org.xipki.security.util.PKCS1Util

public class PKCS1Util
extends Object

PKCS#1 utility class.

Since:

5.3.14

Author:

Lijun Liao (xipki)

Constructor Summary

Constructors

Constructor	Description
PKCS1Util()

Method Summary

Modifier and Type	Method	Description
static byte[]	EMSA_PKCS1_v1_5_encoding(byte[] encodedDigestInfo, int modulusBigLength)
static byte[]	EMSA_PKCS1_v1_5_encoding(byte[] hashValue, int modulusBigLength, HashAlgo hashAlgo)
static boolean	EMSA_PSS_DECODE(HashAlgo mgfDigest, byte[] mHash, byte[] EM, int sLen, int modulusBitLength)	The decoding operation EMSA-PSS-Decode recovers the message hash from an encoded message EM and compares it to the hash of M.
static byte[]	EMSA_PSS_ENCODE(HashAlgo contentDigest, byte[] hashValue, HashAlgo mgfDigest, int saltLen, int modulusBitLength, SecureRandom random)
static byte[]	getDigestPkcsPrefix(HashAlgo hashAlgo)
static byte[]	RSAES_OAEP_DECODE(byte[] EM, int modulusBigLength, HashAlgo hashAlgo)
static byte[]	RSAES_OAEP_ENCODE(byte[] M, int modulusBigLength, HashAlgo hashAlgo, SecureRandom random)

Methods inherited from class java.lang.Object

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

Constructor Detail

PKCS1Util

public PKCS1Util()

Method Detail

EMSA_PKCS1_v1_5_encoding

public static byte[] EMSA_PKCS1_v1_5_encoding(byte[] hashValue,
                                              int modulusBigLength,
                                              HashAlgo hashAlgo)
                                       throws XiSecurityException

Throws:

XiSecurityException

EMSA_PKCS1_v1_5_encoding

public static byte[] EMSA_PKCS1_v1_5_encoding(byte[] encodedDigestInfo,
                                              int modulusBigLength)
                                       throws XiSecurityException

Throws:

XiSecurityException

EMSA_PSS_ENCODE

public static byte[] EMSA_PSS_ENCODE(HashAlgo contentDigest,
                                     byte[] hashValue,
                                     HashAlgo mgfDigest,
                                     int saltLen,
                                     int modulusBitLength,
                                     SecureRandom random)
                              throws XiSecurityException

Throws:

XiSecurityException

EMSA_PSS_DECODE

public static boolean EMSA_PSS_DECODE(HashAlgo mgfDigest,
                                      byte[] mHash,
                                      byte[] EM,
                                      int sLen,
                                      int modulusBitLength)

The decoding operation EMSA-PSS-Decode recovers the message hash from an encoded message EM and compares it to the hash of M.

Parameters:

mgfDigest - The MGF digest.

mHash - the byte sequence resulting from applying the message digest algorithm Hash to the message M.

EM - the encoded message, an octet string of length emLen = CEILING(emBits/8).

sLen - the length, in octets, of the expected salt.

modulusBitLength - bit length of the RSA modulus.

Returns:

true if the result of the verification was consistent with the expected result; and false if the result was inconsistent.

Throws:

IllegalArgumentException - if an exception occurs.

getDigestPkcsPrefix

public static byte[] getDigestPkcsPrefix(HashAlgo hashAlgo)

RSAES_OAEP_ENCODE

public static byte[] RSAES_OAEP_ENCODE(byte[] M,
                                       int modulusBigLength,
                                       HashAlgo hashAlgo,
                                       SecureRandom random)

RSAES_OAEP_DECODE

public static byte[] RSAES_OAEP_DECODE(byte[] EM,
                                       int modulusBigLength,
                                       HashAlgo hashAlgo)