jarsigner(1) - phpMan

Command: man perldoc info search(apropos)  


jarsigner(1)                              Security Tools                             jarsigner(1)

NAME
       jarsigner - Signs and verifies Java Archive (JAR) files.

SYNOPSIS
       jarsigner [ options ] jar-file alias

       jarsigner -verify [ options ] jar-file [alias ...]

       options
              The command-line options. See Options.

       -verify
              The -verify option can take zero or more keystore alias names after the JAR file
              name. When the -verify option is specified, the jarsigner command checks that the
              certificate used to verify each signed entry in the JAR file matches one of the
              keystore aliases. The aliases are defined in the keystore specified by -keystore or
              the default keystore.

              If you also specified the -strict option, and the jarsigner command detected severe
              warnings, the message, "jar verified, with signer errors" is displayed.

       jar-file
              The JAR file to be signed.

              If you also specified the -strict option, and the jarsigner command detected severe
              warnings, the message, "jar signed, with signer errors" is displayed.

       alias  The aliases are defined in the keystore specified by -keystore or the default
              keystore.

DESCRIPTION
       The jarsigner tool has two purposes:

       o To sign Java Archive (JAR) files.

       o To verify the signatures and integrity of signed JAR files.

       The JAR feature enables the packaging of class files, images, sounds, and other digital
       data in a single file for faster and easier distribution. A tool named jar enables
       developers to produce JAR files. (Technically, any zip file can also be considered a JAR
       file, although when created by the jar command or processed by the jarsigner command, JAR
       files also contain a META-INF/MANIFEST.MF file.)

       A digital signature is a string of bits that is computed from some data (the data being
       signed) and the private key of an entity (a person, company, and so on). Similar to a
       handwritten signature, a digital signature has many useful characteristics:

       o Its authenticity can be verified by a computation that uses the public key corresponding
         to the private key used to generate the signature.

       o It cannot be forged, assuming the private key is kept secret.

       o It is a function of the data signed and thus cannot be claimed to be the signature for
         other data as well.

       o The signed data cannot be changed. If the data is changed, then the signature cannot be
         verified as authentic.

       To generate an entity's signature for a file, the entity must first have a public/private
       key pair associated with it and one or more certificates that authenticate its public key.
       A certificate is a digitally signed statement from one entity that says that the public
       key of another entity has a particular value.

       The jarsigner command uses key and certificate information from a keystore to generate
       digital signatures for JAR files. A keystore is a database of private keys and their
       associated X.509 certificate chains that authenticate the corresponding public keys. The
       keytool command is used to create and administer keystores.

       The jarsigner command uses an entity's private key to generate a signature. The signed JAR
       file contains, among other things, a copy of the certificate from the keystore for the
       public key corresponding to the private key used to sign the file. The jarsigner command
       can verify the digital signature of the signed JAR file using the certificate inside it
       (in its signature block file).

       The jarsigner command can generate signatures that include a time stamp that lets a
       systems or deployer (including Java Plug-in) to check whether the JAR file was signed
       while the signing certificate was still valid. In addition, APIs allow applications to
       obtain the timestamp information.

       At this time, the jarsigner command can only sign JAR files created by the jar command or
       zip files. JAR files are the same as zip files, except they also have a META-
       INF/MANIFEST.MF file. A META-INF/MANIFEST.MF file is created when the jarsigner command
       signs a zip file.

       The default jarsigner command behavior is to sign a JAR or zip file. Use the -verify
       option to verify a signed JAR file.

       The jarsigner command also attempts to validate the signer's certificate after signing or
       verifying. If there is a validation error or any other problem, the command generates
       warning messages. If you specify the -strict option, then the command treats severe
       warnings as errors. See Errors and Warnings.

   KEYSTORE ALIASES
       All keystore entities are accessed with unique aliases.

       When you use the jarsigner command to sign a JAR file, you must specify the alias for the
       keystore entry that contains the private key needed to generate the signature. For
       example, the following command signs the JAR file named MyJARFile.jar with the private key
       associated with the alias duke in the keystore named mystore in the working directory.
       Because no output file is specified, it overwrites MyJARFile.jar with the signed JAR file.

       jarsigner -keystore /working/mystore -storepass <keystore password>
             -keypass <private key password> MyJARFile.jar duke

       Keystores are protected with a password, so the store password must be specified. You are
       prompted for it when you do not specify it on the command line. Similarly, private keys
       are protected in a keystore with a password, so the private key's password must be
       specified, and you are prompted for the password when you do not specify it on the command
       line and it is not the same as the store password.

   KEYSTORE LOCATION
       The jarsigner command has a -keystore option for specifying the URL of the keystore to be
       used. The keystore is by default stored in a file named .keystore in the user's home
       directory, as determined by the user.home system property.

       On Oracle Solaris systems, user.home defaults to the user's home directory.

       The input stream from the -keystore option is passed to the KeyStore.load method. If NONE
       is specified as the URL, then a null stream is passed to the KeyStore.load method. NONE
       should be specified when the KeyStore class is not file based, for example, when it
       resides on a hardware token device.

   KEYSTORE IMPLEMENTATION
       The KeyStore class provided in the java.security package supplies a number of well-defined
       interfaces to access and modify the information in a keystore. You can have multiple
       different concrete implementations, where each implementation is for a particular type of
       keystore.

       Currently, there are two command-line tools that use keystore implementations (keytool and
       jarsigner), and a GUI-based tool named Policy Tool. Because the KeyStore class is publicly
       available, JDK users can write additional security applications that use it.

       There is a built-in default implementation provided by Oracle that implements the keystore
       as a file, that uses a proprietary keystore type (format) named JKS. The built-in
       implementation protects each private key with its individual password and protects the
       integrity of the entire keystore with a (possibly different) password.

       Keystore implementations are provider-based, which means the application interfaces
       supplied by the KeyStore class are implemented in terms of a Service Provider Interface
       (SPI). There is a corresponding abstract KeystoreSpi class, also in the java.security
       package, that defines the Service Provider Interface methods that providers must
       implement. The term provider refers to a package or a set of packages that supply a
       concrete implementation of a subset of services that can be accessed by the Java Security
       API. To provide a keystore implementation, clients must implement a provider and supply a
       KeystoreSpi subclass implementation, as described in How to Implement a Provider in the
       Java Cryptography Architecture at
       http://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/HowToImplAProvider.html

       Applications can choose different types of keystore implementations from different
       providers, with the getInstance factory method in the KeyStore class. A keystore type
       defines the storage and data format of the keystore information and the algorithms used to
       protect private keys in the keystore and the integrity of the keystore itself. Keystore
       implementations of different types are not compatible.

       The jarsigner and policytool commands can read file-based keystores from any location that
       can be specified using a URL. In addition, these commands can read non-file-based
       keystores such as those provided by MSCAPI on Windows and PKCS11 on all platforms.

       For the jarsigner and keytool commands, you can specify a keystore type at the command
       line with the -storetype option. For Policy Tool, you can specify a keystore type with the
       Edit command in the KeyStore menu.

       If you do not explicitly specify a keystore type, then the tools choose a keystore
       implementation based on the value of the keystore.type property specified in the security
       properties file. The security properties file is called java.security, and it resides in
       the JDK security properties directory, java.home/lib/security, where java.home is the
       runtime environment's directory. The jre directory in the JDK or the top-level directory
       of the Java Runtime Environment (JRE).

       Each tool gets the keystore.type value and then examines all the installed providers until
       it finds one that implements keystores of that type. It then uses the keystore
       implementation from that provider.

       The KeyStore class defines a static method named getDefaultType that lets applications and
       applets retrieve the value of the keystore.type property. The following line of code
       creates an instance of the default keystore type as specified in the keystore.type
       property:

       KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());

       The default keystore type is jks (the proprietary type of the keystore implementation
       provided by Oracle). This is specified by the following line in the security properties
       file:

       keystore.type=jks

       Case does not matter in keystore type designations. For example, JKS is the same as jks.

       To have the tools use a keystore implementation other than the default, change that line
       to specify a different keystore type. For example, if you have a provider package that
       supplies a keystore implementation for a keystore type called pkcs12, then change the line
       to the following:

       keystore.type=pkcs12

       Note: If you use the PKCS 11 provider package, then see "KeyTool" and "JarSigner" in Java
       PKCS #11 Reference Guide at
       http://docs.oracle.com/javase/8/docs/technotes/guides/security/p11guide.html

   SUPPORTED ALGORITHMS
       By default, the jarsigner command signs a JAR file using one of the following algorithms:

       o Digital Signature Algorithm (DSA) with the SHA1 digest algorithm

       o RSA algorithm with the SHA256 digest algorithm

       o Elliptic Curve (EC) cryptography algorithm with the SHA256 with Elliptic Curve Digital
         Signature Algorithm (ECDSA).

       If the signer's public and private keys are DSA keys, then jarsigner signs the JAR file
       with the SHA1withDSA algorithm. If the signer's keys are RSA keys, then jarsigner attempts
       to sign the JAR file with the SHA256withRSA algorithm. If the signer's keys are EC keys,
       then jarsigner signs the JAR file with the SHA256withECDSA algorithm.

       These default signature algorithms can be overridden using the -sigalg option.

   THE SIGNED JAR FILE
       When the jarsigner command is used to sign a JAR file, the output signed JAR file is
       exactly the same as the input JAR file, except that it has two additional files placed in
       the META-INF directory:

       o A signature file with an .SF extension

       o A signature block file with a .DSA, .RSA, or .EC extension

       The base file names for these two files come from the value of the -sigFile option. For
       example, when the option is -sigFile MKSIGN, the files are named MKSIGN.SF and MKSIGN.DSA

       If no -sigfile option appears on the command line, then the base file name for the .SF and
       .DSA files is the first 8 characters of the alias name specified on the command line, all
       converted to uppercase. If the alias name has fewer than 8 characters, then the full alias
       name is used. If the alias name contains any characters that are not allowed in a
       signature file name, then each such character is converted to an underscore (_) character
       in forming the file name. Valid characters include letters, digits, underscores, and
       hyphens.

       Signature File

       A signature file (.SF file) looks similar to the manifest file that is always included in
       a JAR file when the jarsigner command is used to sign the file. For each source file
       included in the JAR file, the .SF file has three lines, such as in the manifest file, that
       list the following:

       o File name

       o Name of the digest algorithm (SHA)

       o SHA digest value

       In the manifest file, the SHA digest value for each source file is the digest (hash) of
       the binary data in the source file. In the .SF file, the digest value for a specified
       source file is the hash of the three lines in the manifest file for the source file.

       The signature file, by default, includes a header with a hash of the whole manifest file.
       The header also contains a hash of the manifest header. The presence of the header enables
       verification optimization. See JAR File Verification.

       Signature Block File

       The .SF file is signed and the signature is placed in the signature block file. This file
       also contains, encoded inside it, the certificate or certificate chain from the keystore
       that authenticates the public key corresponding to the private key used for signing. The
       file has the extension .DSA, .RSA, or .EC, depending on the digest algorithm used.

   SIGNATURE TIME STAMP
       The jarsigner command can generate and store a signature time stamp when signing a JAR
       file. In addition, jarsigner supports alternative signing mechanisms. This behavior is
       optional and is controlled by the user at the time of signing through these options. See
       Options.

       -tsa url
       -tsacert alias
       -altsigner class
       -altsignerpath classpathlist
       -tsapolicyid policyid

   JAR FILE VERIFICATION
       A successful JAR file verification occurs when the signatures are valid, and none of the
       files that were in the JAR file when the signatures were generated have changed since
       then. JAR file verification involves the following steps:

       1.  Verify the signature of the .SF file.

           The verification ensures that the signature stored in each signature block (.DSA) file
           was generated using the private key corresponding to the public key whose certificate
           (or certificate chain) also appears in the .DSA file. It also ensures that the
           signature is a valid signature of the corresponding signature (.SF) file, and thus the
           .SF file was not tampered with.

       2.  Verify the digest listed in each entry in the .SF file with each corresponding section
           in the manifest.

           The .SF file by default includes a header that contains a hash of the entire manifest
           file. When the header is present, the verification can check to see whether or not the
           hash in the header matches the hash of the manifest file. If there is a match, then
           verification proceeds to the next step.

           If there is no match, then a less optimized verification is required to ensure that
           the hash in each source file information section in the .SF file equals the hash of
           its corresponding section in the manifest file. See Signature File.

           One reason the hash of the manifest file that is stored in the .SF file header might
           not equal the hash of the current manifest file is that one or more files were added
           to the JAR file (with the jar tool) after the signature and .SF file were generated.
           When the jar tool is used to add files, the manifest file is changed by adding
           sections to it for the new files, but the .SF file is not changed. A verification is
           still considered successful when none of the files that were in the JAR file when the
           signature was generated have been changed since then. This happens when the hashes in
           the non-header sections of the .SF file equal the hashes of the corresponding sections
           in the manifest file.

       3.  Read each file in the JAR file that has an entry in the .SF file. While reading,
           compute the file's digest and compare the result with the digest for this file in the
           manifest section. The digests should be the same or verification fails.

           If any serious verification failures occur during the verification process, then the
           process is stopped and a security exception is thrown. The jarsigner command catches
           and displays the exception.

       Note: You should read any addition warnings (or errors if you specified the -strict
       option), as well as the content of the certificate (by specifying the -verbose and -certs
       options) to determine if the signature can be trusted.

   MULTIPLE SIGNATURES FOR A JAR FILE
       A JAR file can be signed by multiple people by running the jarsigner command on the file
       multiple times and specifying the alias for a different person each time, as follows:

       jarsigner myBundle.jar susan
       jarsigner myBundle.jar kevin

       When a JAR file is signed multiple times, there are multiple .SF and .DSA files in the
       resulting JAR file, one pair for each signature. In the previous example, the output JAR
       file includes files with the following names:

       SUSAN.SF
       SUSAN.DSA
       KEVIN.SF
       KEVIN.DSA

OPTIONS
       The following sections describe the various jarsigner options. Be aware of the following
       standards:

       o All option names are preceded by a minus sign (-).

       o The options can be provided in any order.

       o Items that are in italics or underlined (option values) represent the actual values that
         must be supplied.

       o The -storepass, -keypass, -sigfile, -sigalg, -digestalg, -signedjar, and TSA-related
         options are only relevant when signing a JAR file; they are not relevant when verifying
         a signed JAR file. The -keystore option is relevant for signing and verifying a JAR
         file. In addition, aliases are specified when signing and verifying a JAR file.

       -keystore url
         Specifies the URL that tells the keystore location. This defaults to the file .keystore
         in the user's home directory, as determined by the user.home system property.

         A keystore is required when signing. You must explicitly specify a keystore when the
         default keystore does not exist or if you want to use one other than the default.

         A keystore is not required when verifying, but if one is specified or the default exists
         and the -verbose option was also specified, then additional information is output
         regarding whether or not any of the certificates used to verify the JAR file are
         contained in that keystore.

         The -keystore argument can be a file name and path specification rather than a URL, in
         which case it is treated the same as a file: URL, for example, the following are
         equivalent:

         -keystore filePathAndName
         -keystore file:filePathAndName

         If the Sun PKCS #11 provider was configured in the java.security security properties
         file (located in the JRE's $JAVA_HOME/lib/security directory), then the keytool and
         jarsigner tools can operate on the PKCS #11 token by specifying these options:

         -keystore NONE
         -storetype PKCS11

         For example, the following command lists the contents of the configured PKCS#11 token:

         keytool -keystore NONE -storetype PKCS11 -list

       -storetype storetype
         Specifies the type of keystore to be instantiated. The default keystore type is the one
         that is specified as the value of the keystore.type property in the security properties
         file, which is returned by the static getDefaultType method in java.security.KeyStore.

         The PIN for a PCKS #11 token can also be specified with the -storepass option. If none
         is specified, then the keytool and jarsigner commands prompt for the token PIN. If the
         token has a protected authentication path (such as a dedicated PIN-pad or a biometric
         reader), then the -protected option must be specified and no password options can be
         specified.

       -storepass[:env | :file] argument
         Specifies the password that is required to access the keystore. This is only needed when
         signing (not verifying) a JAR file. In that case, if a -storepass option is not provided
         at the command line, then the user is prompted for the password.

         If the modifier env or file is not specified, then the password has the value argument.
         Otherwise, the password is retrieved as follows:

         o env: Retrieve the password from the environment variable named argument.

         o file: Retrieve the password from the file named argument.

       Note: The password should not be specified on the command line or in a script unless it is
       for testing purposes, or you are on a secure system.

       -keypass [:env | :file] argument
         Specifies the password used to protect the private key of the keystore entry addressed
         by the alias specified on the command line. The password is required when using
         jarsigner to sign a JAR file. If no password is provided on the command line, and the
         required password is different from the store password, then the user is prompted for
         it.

         If the modifier env or file is not specified, then the password has the value argument.
         Otherwise, the password is retrieved as follows:

         o env: Retrieve the password from the environment variable named argument.

         o file: Retrieve the password from the file named argument.

       Note: The password should not be specified on the command line or in a script unless it is
       for testing purposes, or you are on a secure system.

       -sigfile file
         Specifies the base file name to be used for the generated .SF and .DSA files. For
         example, if file is DUKESIGN, then the generated .SF and .DSA files are named
         DUKESIGN.SF and DUKESIGN.DSA, and placed in the META-INF directory of the signed JAR
         file.

         The characters in the file must come from the set a-zA-Z0-9_-. Only letters, numbers,
         underscore, and hyphen characters are allowed. All lowercase characters are converted to
         uppercase for the .SF and .DSA file names.

         If no -sigfile option appears on the command line, then the base file name for the .SF
         and .DSA files is the first 8 characters of the alias name specified on the command
         line, all converted to upper case. If the alias name has fewer than 8 characters, then
         the full alias name is used. If the alias name contains any characters that are not
         valid in a signature file name, then each such character is converted to an underscore
         (_) character to form the file name.

       -sigalg algorithm
         Specifies the name of the signature algorithm to use to sign the JAR file.

         For a list of standard signature algorithm names, see "Appendix A: Standard Names" in
         the Java Cryptography Architecture (JCA) Reference Guide at
         http://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA

         This algorithm must be compatible with the private key used to sign the JAR file. If
         this option is not specified, then SHA1withDSA, SHA256withRSA, or SHA256withECDSA are
         used depending on the type of private key. There must either be a statically installed
         provider supplying an implementation of the specified algorithm or the user must specify
         one with the -providerClass option; otherwise, the command will not succeed.

       -digestalg algorithm
         Specifies the name of the message digest algorithm to use when digesting the entries of
         a JAR file.

         For a list of standard message digest algorithm names, see "Appendix A: Standard Names"
         in the Java Cryptography Architecture (JCA) Reference Guide at
         http://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/CryptoSpec.html#AppA

         If this option is not specified, then SHA256 is used. There must either be a statically
         installed provider supplying an implementation of the specified algorithm or the user
         must specify one with the -providerClass option; otherwise, the command will not
         succeed.

       -certs
         If the -certs option appears on the command line with the -verify and -verbose options,
         then the output includes certificate information for each signer of the JAR file. This
         information includes the name of the type of certificate (stored in the .DSA file) that
         certifies the signer's public key, and if the certificate is an X.509 certificate (an
         instance of the java.security.cert.X509Certificate), then the distinguished name of the
         signer.

         The keystore is also examined. If no keystore value is specified on the command line,
         then the default keystore file (if any) is checked. If the public key certificate for a
         signer matches an entry in the keystore, then the alias name for the keystore entry for
         that signer is displayed in parentheses.

       -certchain file
         Specifies the certificate chain to be used when the certificate chain associated with
         the private key of the keystore entry that is addressed by the alias specified on the
         command line is not complete. This can happen when the keystore is located on a hardware
         token where there is not enough capacity to hold a complete certificate chain. The file
         can be a sequence of concatenated X.509 certificates, or a single PKCS#7 formatted data
         block, either in binary encoding format or in printable encoding format (also known as
         Base64 encoding) as defined by the Internet RFC 1421 standard. See Internet RFC 1421
         Certificate Encoding Standard and http://tools.ietf.org/html/rfc1421.

       -verbose
         When the -verbose option appears on the command line, it indicates verbose mode, which
         causes jarsigner to output extra information about the progress of the JAR signing or
         verification.

       -internalsf
         In the past, the .DSA (signature block) file generated when a JAR file was signed
         included a complete encoded copy of the .SF file (signature file) also generated. This
         behavior has been changed. To reduce the overall size of the output JAR file, the .DSA
         file by default does not contain a copy of the .SF file anymore. If -internalsf appears
         on the command line, then the old behavior is utilized. This option is useful for
         testing. In practice, do not use the -internalsf option because it incurs higher
         overhead.

       -sectionsonly
         If the -sectionsonly option appears on the command line, then the .SF file (signature
         file) generated when a JAR file is signed does not include a header that contains a hash
         of the whole manifest file. It contains only the information and hashes related to each
         individual source file included in the JAR file. See Signature File.

         By default, this header is added, as an optimization. When the header is present,
         whenever the JAR file is verified, the verification can first check to see whether the
         hash in the header matches the hash of the whole manifest file. When there is a match,
         verification proceeds to the next step. When there is no match, it is necessary to do a
         less optimized verification that the hash in each source file information section in the
         .SF file equals the hash of its corresponding section in the manifest file. See JAR File
         Verification.

         The -sectionsonly option is primarily used for testing. It should not be used other than
         for testing because using it incurs higher overhead.

       -protected
         Values can be either true or false. Specify true when a password must be specified
         through a protected authentication path such as a dedicated PIN reader.

       -providerClass provider-class-name
         Used to specify the name of cryptographic service provider's master class file when the
         service provider is not listed in the java.security security properties file.

         Used with the -providerArg ConfigFilePath option, the keytool and jarsigner tools
         install the provider dynamically and use ConfigFilePath for the path to the token
         configuration file. The following example shows a command to list a PKCS #11 keystore
         when the Oracle PKCS #11 provider was not configured in the security properties file.

         jarsigner -keystore NONE -storetype PKCS11 \
                   -providerClass sun.security.pkcs11.SunPKCS11 \
                   -providerArg /mydir1/mydir2/token.config \
                   -list

       -providerName providerName
         If more than one provider was configured in the java.security security properties file,
         then you can use the -providerName option to target a specific provider instance. The
         argument to this option is the name of the provider.

         For the Oracle PKCS #11 provider, providerName is of the form SunPKCS11-TokenName, where
         TokenName is the name suffix that the provider instance has been configured with, as
         detailed in the configuration attributes table. For example, the following command lists
         the contents of the PKCS #11 keystore provider instance with name suffix SmartCard:

         jarsigner -keystore NONE -storetype PKCS11 \
                 -providerName SunPKCS11-SmartCard \
                 -list

       -Jjavaoption
         Passes through the specified javaoption string directly to the Java interpreter. The
         jarsigner command is a wrapper around the interpreter. This option should not contain
         any spaces. It is useful for adjusting the execution environment or memory usage. For a
         list of possible interpreter options, type java -h or java -X at the command line.

       -tsa url
         If -tsa http://example.tsa.url appears on the command line when signing a JAR file then
         a time stamp is generated for the signature. The URL, http://example.tsa.url, identifies
         the location of the Time Stamping Authority (TSA) and overrides any URL found with the
         -tsacert option. The -tsa option does not require the TSA public key certificate to be
         present in the keystore.

         To generate the time stamp, jarsigner communicates with the TSA with the Time-Stamp
         Protocol (TSP) defined in RFC 3161. When successful, the time stamp token returned by
         the TSA is stored with the signature in the signature block file.

       -tsacert alias
         When -tsacert alias appears on the command line when signing a JAR file, a time stamp is
         generated for the signature. The alias identifies the TSA public key certificate in the
         keystore that is in effect. The entry's certificate is examined for a Subject
         Information Access extension that contains a URL identifying the location of the TSA.

         The TSA public key certificate must be present in the keystore when using the -tsacert
         option.

       -tsapolicyid policyid
         Specifies the object identifier (OID) that identifies the policy ID to be sent to the
         TSA server. If this option is not specified, no policy ID is sent and the TSA server
         will choose a default policy ID.

         Object identifiers are defined by X.696, which is an ITU Telecommunication
         Standardization Sector (ITU-T) standard. These identifiers are typically period-
         separated sets of non-negative digits like 1.2.3.4, for example.

       -altsigner class
         This option specifies an alternative signing mechanism. The fully qualified class name
         identifies a class file that extends the com.sun.jarsigner.ContentSigner abstract class.
         The path to this class file is defined by the -altsignerpath option. If the -altsigner
         option is used, then the jarsigner command uses the signing mechanism provided by the
         specified class. Otherwise, the jarsigner command uses its default signing mechanism.

         For example, to use the signing mechanism provided by a class named
         com.sun.sun.jarsigner.AuthSigner, use the jarsigner option -altsigner
         com.sun.jarsigner.AuthSigner.

       -altsignerpath classpathlist
         Specifies the path to the class file and any JAR file it depends on. The class file name
         is specified with the -altsigner option. If the class file is in a JAR file, then this
         option specifies the path to that JAR file.

         An absolute path or a path relative to the current directory can be specified. If
         classpathlist contains multiple paths or JAR files, then they should be separated with a
         colon (:) on Oracle Solaris and a semicolon (;) on Windows. This option is not necessary
         when the class is already in the search path.

         The following example shows how to specify the path to a JAR file that contains the
         class file. The JAR file name is included.

         -altsignerpath /home/user/lib/authsigner.jar

         The following example shows how to specify the path to the JAR file that contains the
         class file. The JAR file name is omitted.

         -altsignerpath /home/user/classes/com/sun/tools/jarsigner/

       -strict
         During the signing or verifying process, the command may issue warning messages. If you
         specify this option, the exit code of the tool reflects the severe warning messages that
         this command found. See Errors and Warnings.

       -verbose suboptions
         For the verifying process, the -verbose option takes suboptions to determine how much
         information is shown. If the -certs option is also specified, then the default mode (or
         suboption all) displays each entry as it is being processed, and after that, the
         certificate information for each signer of the JAR file. If the -certs and the
         -verbose:grouped suboptions are specified, then entries with the same signer info are
         grouped and displayed together with their certificate information. If -certs and the
         -verbose:summary suboptions are specified, then entries with the same signer information
         are grouped and displayed together with their certificate information. Details about
         each entry are summarized and displayed as one entry (and more). See Examples.

ERRORS AND WARNINGS
       During the signing or verifying process, the jarsigner command may issue various errors or
       warnings.

       If there is a failure, the jarsigner command exits with code 1. If there is no failure,
       but there are one or more severe warnings, the jarsigner command exits with code 0 when
       the -strict option is not specified, or exits with the OR-value of the warning codes when
       the -strict is specified. If there is only informational warnings or no warning at all,
       the command always exits with code 0.

       For example, if a certificate used to sign an entry is expired and has a KeyUsage
       extension that does not allow it to sign a file, the jarsigner command exits with code 12
       (=4+8) when the -strict option is specified.

       Note: Exit codes are reused because only the values from 0 to 255 are legal on Unix-based
       operating systems.

       The following sections describes the names, codes, and descriptions of the errors and
       warnings that the jarsigner command can issue.

   FAILURE
       Reasons why the jarsigner command fails include (but are not limited to) a command line
       parsing error, the inability to find a keypair to sign the JAR file, or the verification
       of a signed JAR fails.

       failure
              Code 1. The signing or verifying fails.

   SEVERE WARNINGS
       Note: Severe warnings are reported as errors if you specify the -strict option.

       Reasons why the jarsigner command issues a severe warning include the certificate used to
       sign the JAR file has an error or the signed JAR file has other problems.

       hasExpiredCert
              Code 4. This jar contains entries whose signer certificate has expired.

       notYetValidCert
              Code 4. This jar contains entries whose signer certificate is not yet valid.

       chainNotValidated
              Code 4. This jar contains entries whose certificate chain cannot be correctly
              validated.

       badKeyUsage
              Code 8. This jar contains entries whose signer certificate's KeyUsage extension
              doesn't allow code signing.

       badExtendedKeyUsage
              Code 8. This jar contains entries whose signer certificate's ExtendedKeyUsage
              extension doesn't allow code signing.

       badNetscapeCertType
              Code 8. This jar contains entries whose signer certificate's NetscapeCertType
              extension doesn't allow code signing.

       hasUnsignedEntry
              Code 16. This jar contains unsigned entries which have not been integrity-checked.

       notSignedByAlias
              Code 32. This jar contains signed entries which are not signed by the specified
              alias(es).

       aliasNotInStore
              Code 32. This jar contains signed entries that are not signed by alias in this
              keystore.

   INFORMATIONAL WARNINGS
       Informational warnings include those that are not errors but regarded as bad practice.
       They do not have a code.

       hasExpiringCert
              This jar contains entries whose signer certificate will expire within six months.

       noTimestamp
              This jar contains signatures that does not include a timestamp. Without a
              timestamp, users may not be able to validate this JAR file after the signer
              certificate's expiration date (YYYY-MM-DD) or after any future revocation date.

EXAMPLES
   SIGN A JAR FILE
       Use the following command to sign bundle.jar with the private key of a user whose keystore
       alias is jane in a keystore named mystore in the working directory and name the signed JAR
       file sbundle.jar:

       jarsigner -keystore /working/mystore
           -storepass <keystore password>
           -keypass <private key password>
           -signedjar sbundle.jar bundle.jar jane

       There is no -sigfile specified in the previous command so the generated .SF and .DSA files
       to be placed in the signed JAR file have default names based on the alias name. They are
       named JANE.SF and JANE.DSA.

       If you want to be prompted for the store password and the private key password, then you
       could shorten the previous command to the following:

       jarsigner -keystore /working/mystore
           -signedjar sbundle.jar bundle.jar jane

       If the keystore is the default keystore (.keystore in your home directory), then you do
       not need to specify a keystore, as follows:

       jarsigner -signedjar sbundle.jar bundle.jar jane

       If you want the signed JAR file to overwrite the input JAR file (bundle.jar), then you do
       not need to specify a -signedjar option, as follows:

       jarsigner bundle.jar jane

   VERIFY A SIGNED JAR FILE
       To verify a signed JAR file to ensure that the signature is valid and the JAR file was not
       been tampered with, use a command such as the following:

       jarsigner -verify sbundle.jar

       When the verification is successful, jar verified is displayed. Otherwise, an error
       message is displayed. You can get more information when you use the -verbose option. A
       sample use of jarsigner with the-verbose option follows:

       jarsigner -verify -verbose sbundle.jar
                  198 Fri Sep 26 16:14:06 PDT 1997 META-INF/MANIFEST.MF
                  199 Fri Sep 26 16:22:10 PDT 1997 META-INF/JANE.SF
                 1013 Fri Sep 26 16:22:10 PDT 1997 META-INF/JANE.DSA
           smk   2752 Fri Sep 26 16:12:30 PDT 1997 AclEx.class
           smk    849 Fri Sep 26 16:12:46 PDT 1997 test.class
             s = signature was verified
             m = entry is listed in manifest
             k = at least one certificate was found in keystore
           jar verified.

   VERIFICATION WITH CERTIFICATE INFORMATION
       If you specify the -certs option with the -verify and -verbose options, then the output
       includes certificate information for each signer of the JAR file. The information includes
       the certificate type, the signer distinguished name information (when it is an X.509
       certificate), and in parentheses, the keystore alias for the signer when the public key
       certificate in the JAR file matches the one in a keystore entry, for example:

       jarsigner -keystore /working/mystore -verify -verbose -certs myTest.jar
                  198 Fri Sep 26 16:14:06 PDT 1997 META-INF/MANIFEST.MF
                  199 Fri Sep 26 16:22:10 PDT 1997 META-INF/JANE.SF
                 1013 Fri Sep 26 16:22:10 PDT 1997 META-INF/JANE.DSA
                  208 Fri Sep 26 16:23:30 PDT 1997 META-INF/JAVATEST.SF
                 1087 Fri Sep 26 16:23:30 PDT 1997 META-INF/JAVATEST.DSA
           smk   2752 Fri Sep 26 16:12:30 PDT 1997 Tst.class
             X.509, CN=Test Group, OU=Java Software, O=Oracle, L=CUP, S=CA, C=US (javatest)
             X.509, CN=Jane Smith, OU=Java Software, O=Oracle, L=cup, S=ca, C=us (jane)
             s = signature was verified
             m = entry is listed in manifest
             k = at least one certificate was found in keystore
           jar verified.

       If the certificate for a signer is not an X.509 certificate, then there is no
       distinguished name information. In that case, just the certificate type and the alias are
       shown. For example, if the certificate is a PGP certificate, and the alias is bob, then
       you would get: PGP, (bob).

SEE ALSO
       o jar(1)

       o keytool(1)

       o Trail: Security Features in Java SE at
         http://docs.oracle.com/javase/tutorial/security/index.html

JDK 8                                    21 November 2013                            jarsigner(1)

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2025-01-15 03:56 @3.15.237.229 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Valid XHTML 1.0!Valid CSS!