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## com.ibm.security.keystoreski
Interface SKIDefinition

    public interface SKIDefinition

Defines the process of extracting a Subject Key Identifier from a `Certificate`. This may include inspection of the extensions fields of the certificate, generating a hash of the certificate or some other attempt to identify the certificate. RFC 3280 Section 4.2.1.2 specifies various recommended methods of generating the Subject Key Identifier for a certificate.

See Also:
  RFC 3280 Section 4.2.1.2

Method Summary
`String` | `getSubjectKeyIdentifier(X509Certificate cert)` Returns the Subject Key Identifier for a certificate or `null` if the subject key identifier cannot be determined.

Method Detail

### getSubjectKeyIdentifier

    String getSubjectKeyIdentifier(X509Certificate cert)
                                   throws NullPointerException

  Returns the Subject Key Identifier for a certificate or `null` if the subject key identifier cannot be determined.

  Parameters:
    `cert` - The certificate for which to obtain the Subject Key Identifier for.
  Returns:
    The Subject Key Identifier for a certificate or `null` if the subject key identifier cannot be determined.
  Throws:
    `NullPointerException` - If `cert` is `null`.

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