package javax.crypto.spec; /** * This class specifies the source for encoding input P in OAEP Padding, as * defined in the {@link http://www.ietf.org/rfc/rfc3447.txt PKCS #1} standard. * *
* * PKCS1PSourceAlgorithms ALGORITHM-IDENTIFIER ::= { * { OID id-pSpecified PARAMETERS OCTET STRING }, * ... -- Allows for future expansion -- * } **/ public class PSource { /** * This class is used to explicitly specify the value for encoding input P * in OAEP Padding. * */ public final static class PSpecified extends PSource { private byte[] p; /** * The encoding input P whose value equals byte[0]. */ public static final PSpecified DEFAULT = new PSpecified(new byte[0]); /** * Constructs the source explicitly with the specified value p as the * encoding input P. * * @param p the value of the encoding input. The contents of the array * are copied to protect against subsequent modification. * @throws NullPointerException if p is null. */ public PSpecified(byte[] p) { super("PSpecified"); if (p == null) { throw new NullPointerException("The encoding input is null"); } this.p = copyOf(p); } /** * Returns the value of encoding input P. * * @return the value of encoding input P. A new array is returned each * time this method is called. */ public byte[] getValue() { return copyOf(p); } private byte[] copyOf(byte[] b) { byte[] tmp = new byte[b.length]; System.arraycopy(b, 0, tmp, 0, b.length); return tmp; } } private String pSrcName; /** * Constructs a source of the encoding input P for OAEP padding as defined * in the PKCS #1 standard using the specified PSource algorithm. * * @param pSrcName the algorithm for the source of the encoding input P. * @throws NullPointerException if pSrcName is null. */ protected PSource(String pSrcName) { if (pSrcName == null) { throw new NullPointerException("pSrcName is null"); } this.pSrcName = pSrcName; } /** * Returns the PSource algorithm name. * * @return the PSource algorithm name. */ public String getAlgorithm() { return pSrcName; } }