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affordable tomcat development However, while the digest values in the manifest are computed from the files themselves, the digest values in the signature file are computed from the corresponding entries in the manifest. Signature files also contain a digest value for the entire manifest (see the SHA1-Digest-Manifest header in the above example).When a signed JAR file is being verified, the digests of each of its files are re-computed and compared with the digests recorded in the manifest to ensure that the contents of the JAR file haven't changed since it was signed. As an additional check, digest values for the manifest file itself are re-computed and compared against the values recorded in the signature file.You can read additional information about signature files on the Manifest Format page of the JDKTM documentation.
affordable tomcat development The Signature Block FileIn addition to the signature file, a signature block file is automatically placed in the META-INF directory when a JAR file is signed. Unlike the manifest file or the signature file, signature block files are not human-readable.The signature block file contains two elements essential for verification: The digital signature for the JAR file that was generated with the signer's private key The certificate containing the signer's public key, to be used by anyone wanting to verify the signed JAR file Signature block filenames typically will have a .DSA extension indicating that they were created by the default Digital Signature Algorithm. Other filename extensions are possible if keys associated with some other standard algorithm are used for signing.
affordable tomcat development Related Documentation For additional information about keys, certificates, and certification authorities, see The JDK Security Tools X.509 Certificates For more information about the Java platform's security architecture, see this related documentation: Security Features in Java SE The Java Cryptography Extension web site JDK Security Documentation « Previous • Trail • Next » Problems with the examples? Try Compiling and Running the Examples: FAQs. Complaints? Compliments? Suggestions? Give us your feedback. Copyright 1995-2007 Sun Microsystems, Inc. All rights reserved.
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