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package java.security.spec;

import java.security.spec.AlgorithmParameterSpec;

This class specifies the set of parameters used with mask generation function MGF1 in OAEP Padding and RSASSA-PSS signature scheme, as defined in the PKCS#1 v2.2 standard.

Its ASN.1 definition in PKCS#1 standard is described below:

PKCS1MGFAlgorithms    ALGORITHM-IDENTIFIER ::= {
  { OID id-mgf1 PARAMETERS HashAlgorithm },
  ...  -- Allows for future expansion --
}
where
HashAlgorithm ::= AlgorithmIdentifier {
  {OAEP-PSSDigestAlgorithms}
}
OAEP-PSSDigestAlgorithms    ALGORITHM-IDENTIFIER ::= {
  { OID id-sha1       PARAMETERS NULL }|
  { OID id-sha224     PARAMETERS NULL }|
  { OID id-sha256     PARAMETERS NULL }|
  { OID id-sha384     PARAMETERS NULL }|
  { OID id-sha512     PARAMETERS NULL }|
  { OID id-sha512-224 PARAMETERS NULL }|
  { OID id-sha512-256 PARAMETERS NULL },
  ...  -- Allows for future expansion --
}
Author:Valerie Peng
See Also:
Since:1.5
/** * This class specifies the set of parameters used with mask generation * function MGF1 in OAEP Padding and RSASSA-PSS signature scheme, as * defined in the * <a href="https://tools.ietf.org/rfc/rfc8017.txt">PKCS#1 v2.2</a> standard. * * <p>Its ASN.1 definition in PKCS#1 standard is described below: * <pre> * PKCS1MGFAlgorithms ALGORITHM-IDENTIFIER ::= { * { OID id-mgf1 PARAMETERS HashAlgorithm }, * ... -- Allows for future expansion -- * } * </pre> * where * <pre> * HashAlgorithm ::= AlgorithmIdentifier { * {OAEP-PSSDigestAlgorithms} * } * * OAEP-PSSDigestAlgorithms ALGORITHM-IDENTIFIER ::= { * { OID id-sha1 PARAMETERS NULL }| * { OID id-sha224 PARAMETERS NULL }| * { OID id-sha256 PARAMETERS NULL }| * { OID id-sha384 PARAMETERS NULL }| * { OID id-sha512 PARAMETERS NULL }| * { OID id-sha512-224 PARAMETERS NULL }| * { OID id-sha512-256 PARAMETERS NULL }, * ... -- Allows for future expansion -- * } * </pre> * @see PSSParameterSpec * @see javax.crypto.spec.OAEPParameterSpec * * @author Valerie Peng * * @since 1.5 */
public class MGF1ParameterSpec implements AlgorithmParameterSpec {
The MGF1ParameterSpec which uses "SHA-1" message digest
/** * The MGF1ParameterSpec which uses "SHA-1" message digest */
public static final MGF1ParameterSpec SHA1 = new MGF1ParameterSpec("SHA-1");
The MGF1ParameterSpec which uses "SHA-224" message digest
/** * The MGF1ParameterSpec which uses "SHA-224" message digest */
public static final MGF1ParameterSpec SHA224 = new MGF1ParameterSpec("SHA-224");
The MGF1ParameterSpec which uses "SHA-256" message digest
/** * The MGF1ParameterSpec which uses "SHA-256" message digest */
public static final MGF1ParameterSpec SHA256 = new MGF1ParameterSpec("SHA-256");
The MGF1ParameterSpec which uses "SHA-384" message digest
/** * The MGF1ParameterSpec which uses "SHA-384" message digest */
public static final MGF1ParameterSpec SHA384 = new MGF1ParameterSpec("SHA-384");
The MGF1ParameterSpec which uses SHA-512 message digest
/** * The MGF1ParameterSpec which uses SHA-512 message digest */
public static final MGF1ParameterSpec SHA512 = new MGF1ParameterSpec("SHA-512");
The MGF1ParameterSpec which uses SHA-512/224 message digest
/** * The MGF1ParameterSpec which uses SHA-512/224 message digest */
public static final MGF1ParameterSpec SHA512_224 = new MGF1ParameterSpec("SHA-512/224");
The MGF1ParameterSpec which uses SHA-512/256 message digest
/** * The MGF1ParameterSpec which uses SHA-512/256 message digest */
public static final MGF1ParameterSpec SHA512_256 = new MGF1ParameterSpec("SHA-512/256"); private String mdName;
Constructs a parameter set for mask generation function MGF1 as defined in the PKCS #1 standard.
Params:
  • mdName – the algorithm name for the message digest used in this mask generation function MGF1.
Throws:
/** * Constructs a parameter set for mask generation function MGF1 * as defined in the PKCS #1 standard. * * @param mdName the algorithm name for the message digest * used in this mask generation function MGF1. * @throws NullPointerException if {@code mdName} is null. */
public MGF1ParameterSpec(String mdName) { if (mdName == null) { throw new NullPointerException("digest algorithm is null"); } this.mdName = mdName; }
Returns the algorithm name of the message digest used by the mask generation function.
Returns:the algorithm name of the message digest.
/** * Returns the algorithm name of the message digest used by the mask * generation function. * * @return the algorithm name of the message digest. */
public String getDigestAlgorithm() { return mdName; } }