https://openjdk.java.net/ 
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Provides classes for public key certificates. The classes in this package have been deprecated. New classes should not be added to this package. These classes include a simplified version of the java.security.cert package. These classes were developed as part of the Java Secure Socket Extension (JSSE). When JSSE was added to the J2SE version 1.4, this package was added for backward-compatibility reasons only. New applications should not use this package, but rather java.security.cert. 
Since:1.4
/**
 * Provides classes for public key certificates.
 *
 * The classes in this package have been deprecated. New classes should not
 * be added to this package. These classes include a simplified version of
 * the {@code java.security.cert} package.  These classes were developed as
 * part of the Java Secure Socket Extension (JSSE).  When JSSE was added to
 * the J2SE version 1.4, this package was added for backward-compatibility
 * reasons only.
 *
 * New applications should not use this package, but rather
 * {@code java.security.cert}.
 *
 * @since 1.4
 */
package javax.security.cert;