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## org.mozilla.jss.crypto
Class HMACAlgorithm

    java.lang.Object
      |
      +--org.mozilla.jss.crypto.Algorithm
            |
            +--org.mozilla.jss.crypto.DigestAlgorithm
                  |
                  +--org.mozilla.jss.crypto.HMACAlgorithm

public class HMACAlgorithm
extends DigestAlgorithm

Algorithms for performing HMACs. These can be used to create MessageDigests.

Field Summary
`private static java.util.Hashtable` | `oidMap`
`static HMACAlgorithm` | `SHA1` SHA-1 HMAC.

Fields inherited from class org.mozilla.jss.crypto.DigestAlgorithm
`MD2, MD5`

Fields inherited from class org.mozilla.jss.crypto.Algorithm
`ANSI_X9_ALGORITHM, CKM_AES_CBC, CKM_AES_CBC_PAD, CKM_AES_ECB, CKM_AES_KEY_GEN, CKM_DES_CBC_PAD, CKM_DES_KEY_GEN, CKM_DES3_CBC_PAD, CKM_DES3_ECB, CKM_DES3_KEY_GEN, CKM_DSA_KEY_PAIR_GEN, CKM_PBA_SHA1_WITH_SHA1_HMAC, CKM_RC4_KEY_GEN, CKM_RSA_PKCS_KEY_PAIR_GEN, CKM_SHA_1_HMAC, name, oid, oidIndex, SEC_OID_ANSIX9_DSA_SIGNATURE, SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST, SEC_OID_DES_CBC, SEC_OID_DES_ECB, SEC_OID_DES_EDE3_CBC, SEC_OID_MD2, SEC_OID_MD5, SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION, SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_PKCS1_RSA_ENCRYPTION, SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_128_BIT_RC2_CBC, SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_128_BIT_RC4, SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_3KEY_TRIPLE_DES_CBC, SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_40_BIT_RC2_CBC, SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_40_BIT_RC4, SEC_OID_PKCS5_PBE_WITH_MD2_AND_DES_CBC, SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_PKCS5_PBE_WITH_SHA1_AND_DES_CBC, SEC_OID_RC2_CBC, SEC_OID_RC4, SEC_OID_SHA1`

Constructor Summary
`protected` | `HMACAlgorithm(int oidIndex, java.lang.String name, OBJECT_IDENTIFIER oid, int outputSize)`

Method Summary
`static DigestAlgorithm` | `fromOID(OBJECT_IDENTIFIER oid)` Looks up the HMAC algorithm with the given OID.

Methods inherited from class org.mozilla.jss.crypto.DigestAlgorithm
`getOutputSize`

Methods inherited from class org.mozilla.jss.crypto.Algorithm
`getParameterClass, toOID, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### oidMap

    private static java.util.Hashtable oidMap

### SHA1

    public static final HMACAlgorithm SHA1

  SHA-1 HMAC. This is a Message Authentication Code that uses a symmetric key together with SHA-1 digesting to create a form of signature.

Constructor Detail

### HMACAlgorithm

    protected HMACAlgorithm(int oidIndex,
                            java.lang.String name,
                            OBJECT_IDENTIFIER oid,
                            int outputSize)

Method Detail

### fromOID

    public static DigestAlgorithm fromOID(OBJECT_IDENTIFIER oid)
                                   throws java.security.NoSuchAlgorithmException

  Looks up the HMAC algorithm with the given OID.

  Throws:
    `java.security.NoSuchAlgorithmException` - If no registered HMAC algorithm has the given OID.

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