JARSIGNER(1) JDK Commands JARSIGNER(1) NAME jarsigner - sign and verify Java Archive (JAR) files SYNOPSIS jarsigner [options] jar-file alias jarsigner -verify [options] jar-file [alias ...] jarsigner -version options The command-line options. See Options for jarsigner. -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 specify the -strict option, and the jarsigner com- mand detects 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 com- mand 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. -version The -version option prints the program version of jarsigner. DESCRIPTION The jarsigner tool has two purposes: • To sign Java Archive (JAR) files. • 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 distribu- tion. 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: • Its authenticity can be verified by a computation that uses the pub- lic key corresponding to the private key used to generate the signa- ture. • It can't be forged, assuming the private key is kept secret. • It is a function of the data signed and thus can't be claimed to be the signature for other data as well. • The signed data can't be changed. If the data is changed, then the signature can't 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 cer- tificates that authenticate its public key. A certificate is a digi- tally 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 key- store 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 signa- ture. 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 in- side it (in its signature block file). The jarsigner command can generate signatures that include a time stamp that enables a systems or deployer to check whether the JAR file was signed while the signing certificate was still valid. In addition, APIs allow applications to obtain the timestamp informa- tion. 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, ex- cept they also have a META-INF/MANIFEST.MF file. A META-INF/MANI- FEST.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 certifi- cate after signing or verifying. During validation, it checks the re- vocation status of each certificate in the signer's certificate chain when the -revCheck option is specified. 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. If no output file is specified, it over- writes the original JAR file with the signed JAR file. Keystores are protected with a password, so the store password must be specified. You are prompted for it when you don't 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 don't specify it on the command line and it isn't 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 us- er.home system property. Linux and macOS: user.home defaults to the user's home directory. The input stream from the -keystore option is passed to the Key- Store.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 isn't 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 implementa- tions, where each implementation is for a particular type of keystore. Currently, there are two command-line tools that use keystore implemen- tations (keytool and jarsigner). The default keystore implementation is PKCS12. This is a cross plat- form keystore based on the RSA PKCS12 Personal Information Exchange Syntax Standard. This standard is primarily meant for storing or transporting a user's private keys, certificates, and miscellaneous se- crets. There is another built-in implementation, provided by Oracle. It implements the keystore as a file with a proprietary keystore type (format) named JKS. It protects each private key with its individual password, and also protects the integrity of the entire keystore with a (possibly different) password. Keystore implementations are provider-based, which means the applica- tion interfaces supplied by the KeyStore class are implemented in terms of a Service Provider Interface (SPI). There is a corresponding ab- stract KeystoreSpi class, also in the java.security package, that de- fines the Service Provider Interface methods that providers must imple- ment. 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 implementa- tion, clients must implement a provider and supply a KeystoreSpi sub- class implementation, as described in How to Implement a Provider in the Java Cryptography Architecture [https://www.oracle.com/pls/top- ic/lookup?ctx=en/java/javase&id=security_guide_implement_provider_jca]. 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. Key- store implementations of different types aren't compatible. The jarsigner 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 Win- dows 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. If you don't explicitly specify a keystore type, then the tools choose a keystore implementation based on the value of the keystore.type prop- erty specified in the security properties file. The security proper- ties file is called java.security, and it resides in the JDK security properties directory, java.home/conf/security. Each tool gets the keystore.type value and then examines all the in- stalled 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 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.getDefault- Type()); The default keystore type is pkcs12, which is a cross platform keystore based on the RSA PKCS12 Personal Information Exchange Syntax Standard. This is specified by the following line in the security properties file: keystore.type=pkcs12 Case doesn't matter in keystore type designations. For example, JKS is the same as jks. To have the tools utilize a keystore implementation other than the de- fault, you can change that line to specify a different keystore type. For example, if you want to use the Oracle's jks keystore implementa- tion, then change the line to the following: keystore.type=jks SUPPORTED ALGORITHMS By default, the jarsigner command signs a JAR file using one of the following algorithms and block file extensions depending on the type and size of the private key: Default Signature Algorithms and Block File Extensions keyalg keysize default sigalg block file ex- tension ──────────────────────────────────────────────────────────── DSA any size SHA256withDSA .DSA RSA < 624 SHA256withRSA .RSA <= 7680 SHA384withRSA > 7680 SHA512withRSA EC < 512 SHA384withECDSA .EC >= 512 SHA512withECDSA RSASSA-PSS < 624 RSASSA-PSS (with .RSA SHA-256) <= 7680 RSASSA-PSS (with SHA-384) > 7680 RSASSA-PSS (with SHA-512) EdDSA 255 Ed25519 .EC 448 Ed448 • If an RSASSA-PSS key is encoded with parameters, then jarsigner will use the same parameters in the signature. Otherwise, jarsigner will use parameters that are determined by the size of the key as speci- fied in the table above. For example, an 3072-bit RSASSA-PSS key will use RSASSA-PSS as the signature algorithm and SHA-384 as the hash and MGF1 algorithms. These default signature algorithms can be overridden by using the -sigalg option. The jarsigner command uses the jdk.jar.disabledAlgorithms and jdk.secu- rity.legacyAlgorithms security properties to determine which algorithms are considered a security risk. If the JAR file was signed with any algorithms that are disabled, it will be treated as an unsigned JAR file. If the JAR file was signed with any legacy algorithms, it will be treated as signed with an informational warning to inform users that the legacy algorithm will be disabled in a future update. For detailed verification output, include -J-Djava.security.debug=jar. The jdk.jar.disabledAlgorithms and jdk.security.legacyAlgorithms security properties are defined in the java.security file (located in the JDK's $JAVA_HOME/conf/security directory). Note: In order to improve out of the box security, default key size and sig- nature algorithm names are periodically updated to stronger values with each release of the JDK. If interoperability with older releases of the JDK is important, please make sure the defaults are supported by those releases, or alternatively use the -sigalg option to override the default values at your own risk. 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: • A signature file with an .SF extension • 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.RSA. In this document, we assume the signer always uses an RSA key. If no -sigfile option appears on the command line, then the base file name for the .SF and the signature block files is the first 8 charac- ters 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 aren't 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 two lines, such as in the manifest file, that list the follow- ing: • File name • Name of the digest algorithm (SHA) • SHA digest value Note: The name of the digest algorithm (SHA) and the SHA digest value are on the same line. 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 two 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 certifi- cate or certificate chain from the keystore that authenticates the pub- lic key corresponding to the private key used for signing. The file has the extension .DSA, .RSA, or .EC, depending on the key algorithm used. See the table in Supported Algorithms. SIGNATURE TIME STAMP The jarsigner command used with the following options generates and stores a signature time stamp when signing a JAR file: • -tsa url • -tsacert alias • -tsapolicyid policyid • -tsadigestalg algorithm See Options for jarsigner. 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 signa- tures 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 signa- ture block file was generated using the private key corresponding to the public key whose certificate (or certificate chain) also ap- pears in the signature block file. It also ensures that the signa- ture is a valid signature of the corresponding signature (.SF) file, and thus the .SF file wasn't 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 verifi- cation 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 re- quired to ensure that the hash in each source file information sec- tion 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 it might contain sections for newly added files after the file was signed. For example, suppose one or more files were added to the signed JAR file (using the jar tool) that already contains a signature and a .SF file. If the JAR file is signed again by a different signer, then the manifest file is changed (sections are added to it for the new files by the jarsigner tool) and a new .SF file is created, but the original .SF file is unchanged. A verifi- cation is still considered successful if none of the files that were in the JAR file when the original signature was generated have been changed since then. This is because the hashes in the non- header sections of the .SF file equal the hashes of the correspond- ing 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. 4. Check for disabled algorithm usage. See Supported Algorithms. Note: You should read any addition warnings (or errors if you specified the -strict option), as well as the content of the certificate (by specify- ing 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 dif- ferent 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 signature block files in the resulting JAR file, one pair for each sig- nature. In the previous example, the output JAR file includes files with the following names: SUSAN.SF SUSAN.RSA KEVIN.SF KEVIN.RSA OPTIONS FOR JARSIGNER The following sections describe the options for the jarsigner. Be aware of the following standards: • All option names are preceded by a hyphen sign (-). • The options can be provided in any order. • Items that are in italics or underlined (option values) represent the actual values that must be supplied. • The -storepass, -keypass, -sigfile, -sigalg, -digestalg, -signedjar, and TSA-related options are only relevant when signing a JAR file; they aren't relevant when verifying a signed JAR file. The -keystore option is relevant for signing and verifying a JAR file. In addi- tion, 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 doesn't exist or if you want to use one other than the default. A keystore isn't 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 key- store. 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 se- curity properties file (located in the JDK's $JAVA_HOME/conf/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 config- ured PKCS#11 token: keytool -keystore NONE -storetype PKCS11 -list -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 isn't provided at the command line, then the user is prompted for the password. If the modifier env or file isn't specified, then the password has the value argument. Otherwise, the password is retrieved as follows: • env: Retrieve the password from the environment variable named ar- gument. • file: Retrieve the password from the file named argument. Note: The password shouldn't be specified on the command line or in a script unless it is for testing purposes, or you are on a secure sys- tem. -storetype storetype Specifies the type of keystore to be instantiated. The default key- store type is the one that is specified as the value of the key- store.type property in the security properties file, which is re- turned by the static getDefaultType method in java.security.KeyStore. The PIN for a PKCS #11 token can also be specified with the -storepass option. If none is specified, then the keytool and jar- signer commands prompt for the token PIN. If the token has a pro- tected authentication path (such as a dedicated PIN-pad or a biomet- ric reader), then the -protected option must be specified and no password options can be specified. -keypass [:env | :file] argument -certchain file Specifies the password used to protect the private key of the key- store 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 pass- word is different from the store password, then the user is prompted for it. If the modifier env or file isn't specified, then the password has the value argument. Otherwise, the password is retrieved as follows: • env: Retrieve the password from the environment variable named ar- gument. • file: Retrieve the password from the file named argument. Note: The password shouldn't be specified on the command line or in a script unless it is for testing purposes, or you are on a secure sys- tem. -certchain file Specifies the certificate chain to be used when the certificate chain associated with the private key of the keystore entry that is ad- dressed by the alias specified on the command line isn't complete. This can happen when the keystore is located on a hardware token where there isn't enough capacity to hold a complete certificate chain. The file can be a sequence of concatenated X.509 certifi- cates, or a single PKCS#7 formatted data block, either in binary en- coding format or in printable encoding format (also known as Base64 encoding) as defined by Internet RFC 1421 Certificate Encoding Stan- dard [http://tools.ietf.org/html/rfc1421]. -sigfile file Specifies the base file name to be used for the generated .SF and signature block files. For example, if file is DUKESIGN, then the generated .SF and signature block files are named DUKESIGN.SF and DUKESIGN.RSA, 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 sig- nature block file names. If no -sigfile option appears on the command line, then the base file name for the .SF and signature block files is the first 8 characters of the alias name specified on the command line, all converted to up- per 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 aren't valid in a signature file name, then each such character is converted to an underscore (_) character to form the file name. -signedjar file Specifies the name of signed JAR file. -digestalg algorithm Specifies the name of the message digest algorithm to use when di- gesting the entries of a JAR file. For a list of standard message digest algorithm names, see Java Secu- rity Standard Algorithm Names. If this option isn't specified, then SHA-384 is used. There must ei- ther be a statically installed provider supplying an implementation of the specified algorithm or the user must specify one with the -ad- dprovider or -providerClass options; otherwise, the command will not succeed. -sigalg algorithm Specifies the name of the signature algorithm to use to sign the JAR file. This algorithm must be compatible with the private key used to sign the JAR file. If this option isn't specified, then use a default al- gorithm matching the private key as described in the Supported Algo- rithms section. There must either be a statically installed provider supplying an implementation of the specified algorithm or you must specify one with the -addprovider or -providerClass option; other- wise, the command doesn't succeed. For a list of standard message digest algorithm names, see Java Secu- rity Standard Algorithm Names. -verify Verifies a signed JAR file. -verbose[:suboptions] When the -verbose option appears on the command line, it indicates that the jarsigner use the verbose mode when signing or verifying with the suboptions determining how much information is shown. This causes the , which causes jarsigner to output extra information about the progress of the JAR signing or verification. The suboptions can be all, grouped, or summary. If the -certs option is also specified, then the default mode (or suboption all) displays each entry as it is being processed, and af- ter 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 en- tries with the same signer information are grouped and displayed to- gether with their certificate information. Details about each entry are summarized and displayed as one entry (and more). See Example of Verifying a Signed JAR File and Example of Verification with Certificate Information. -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 signature block 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. -revCheck This option enables revocation checking of certificates when signing or verifying a JAR file. The jarsigner command attempts to make net- work connections to fetch OCSP responses and CRLs if the -revCheck option is specified on the command line. Note that revocation checks are not enabled unless this option is specified. -tsa url If -tsa http://example.tsa.url appears on the command line when sign- ing 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 -tsac- ert option. The -tsa option doesn't require the TSA public key cer- tificate 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 identi- fies the TSA public key certificate in the keystore that is in ef- fect. 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 isn't 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 Telecommuni- cation Standardization Sector (ITU-T) standard. These identifiers are typically period-separated sets of non-negative digits like 1.2.3.4, for example. -tsadigestalg algorithm Specifies the message digest algorithm that is used to generate the message imprint to be sent to the TSA server. If this option isn't specified, SHA-384 will be used. See Supported Algorithms. For a list of standard message digest algorithm names, see Java Secu- rity Standard Algorithm Names. -internalsf In the past, the 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 signature block file by de- fault doesn't 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, don't 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 doesn't in- clude 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 head- er 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 corre- sponding section in the manifest file. See JAR File Verification. The -sectionsonly option is primarily used for testing. It shouldn't be used other than for testing because using it incurs higher over- head. -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. -providerName providerName If more than one provider was configured in the java.security securi- ty properties file, then you can use the -providerName option to tar- get 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 con- figuration 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 -addprovider name [-providerArg arg] Adds a security provider by name (such as SunPKCS11) and an optional configure argument. The value of the security provider is the name of a security provider that is defined in a module. Used with the -providerArg ConfigFilePath option, the keytool and jarsigner tools install the provider dynamically and use Config- FilePath 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 wasn't configured in the security properties file. jarsigner -keystore NONE -storetype PKCS11 -addprovider SunPKCS11 -providerArg /mydir1/mydir2/token.config -providerClass provider-class-name [-providerArg arg] Used to specify the name of cryptographic service provider's master class file when the service provider isn't listed in the java.securi- ty security properties file. Adds a security provider by fully-qual- ified class name and an optional configure argument. Note: The preferred way to load PKCS11 is by using modules. See -ad- dprovider. -providerPath classpath Used to specify the classpath for providers specified by the -providerClass option. Multiple paths should be separated by the system-dependent path-separator character. -Jjavaoption Passes through the specified javaoption string directly to the Java interpreter. The jarsigner command is a wrapper around the inter- preter. This option shouldn't 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. -strict During the signing or verifying process, the command may issue warn- ing 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. -conf url Specifies a pre-configured options file. Read the keytool documenta- tion for details. The property keys supported are "jarsigner.all" for all actions, "jarsigner.sign" for signing, and "jarsigner.verify" for verification. jarsigner arguments including the JAR file name and alias name(s) cannot be set in this file. -version Prints the program version. ERRORS AND WARNINGS During the signing or verifying process, the jarsigner command may is- sue 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 doesn't allow it to sign a file, the jarsign- er command exits with code 12 (=4+8) when the -strict option is speci- fied. Note: Exit codes are reused because only the values from 0 to 255 are legal on Linux and macOS. 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 aren't 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 op- tion. 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. hasExpiredTsaCert Code 4. The timestamp has expired. notYetValidCert Code 4. This JAR contains entries whose signer certificate isn't yet valid. chainNotValidated Code 4. This JAR contains entries whose certificate chain isn't validated. tsaChainNotValidated Code 64. The timestamp is invalid. signerSelfSigned Code 4. This JAR contains entries whose signer certificate is self signed. disabledAlg Code 4. An algorithm used is considered a security risk and is disabled. 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 haven't been integrity-checked. notSignedByAlias Code 32. This JAR contains signed entries which aren't signed by the specified alias(es). aliasNotInStore Code 32. This JAR contains signed entries that aren't signed by alias in this keystore. tsaChainNotValidated Code 64. This JAR contains entries whose TSA certificate chain is invalid. INFORMATIONAL WARNINGS Informational warnings include those that aren't errors but regarded as bad practice. They don't have a code. extraAttributesDetected The POSIX file permissions and/or symlink attributes are detect- ed during signing or verifying a JAR file. The jarsigner tool preserves these attributes in the newly signed file but warns that these attributes are unsigned and not protected by the sig- nature. hasExpiringCert This JAR contains entries whose signer certificate expires with- in six months. hasExpiringTsaCert The timestamp will expire within one year on YYYY-MM-DD. legacyAlg An algorithm used is considered a security risk but not dis- abled. noTimestamp This JAR contains signatures that doesn't 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. EXAMPLE OF SIGNING 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_pass- word -keypass private_key_password -signedjar sbundle.jar bun- dle.jar jane There is no -sigfile specified in the previous command so the generated .SF and signature block files to be placed in the signed JAR file have default names based on the alias name. They are named JANE.SF and JANE.RSA. 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 bun- dle.jar jane If the keystore is the default keystore (.keystore in your home direc- tory), then you don't 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 (bun- dle.jar), then you don't need to specify a -signedjar option, as fol- lows: jarsigner bundle.jar jane EXAMPLE OF VERIFYING A SIGNED JAR FILE To verify a signed JAR file to ensure that the signature is valid and the JAR file wasn't been tampered with, use a command such as the fol- lowing: jarsigner -verify ButtonDemo.jar When the verification is successful, jar verified is displayed. Other- wise, an error message is displayed. You can get more information when you use the -verbose option. A sample use of jarsigner with the -ver- bose option follows: jarsigner -verify -verbose ButtonDemo.jar s 866 Tue Sep 12 20:08:48 EDT 2017 META-INF/MANIFEST.MF 825 Tue Sep 12 20:08:48 EDT 2017 META-INF/ORACLE_C.SF 7475 Tue Sep 12 20:08:48 EDT 2017 META-INF/ORACLE_C.RSA 0 Tue Sep 12 20:07:54 EDT 2017 META-INF/ 0 Tue Sep 12 20:07:16 EDT 2017 components/ 0 Tue Sep 12 20:07:16 EDT 2017 components/images/ sm 523 Tue Sep 12 20:07:16 EDT 2017 components/ButtonDemo$1.class sm 3440 Tue Sep 12 20:07:16 EDT 2017 components/ButtonDemo.class sm 2346 Tue Sep 12 20:07:16 EDT 2017 components/ButtonDemo.jnlp sm 172 Tue Sep 12 20:07:16 EDT 2017 components/images/left.gif sm 235 Tue Sep 12 20:07:16 EDT 2017 components/images/middle.gif sm 172 Tue Sep 12 20:07:16 EDT 2017 components/images/right.gif s = signature was verified m = entry is listed in manifest k = at least one certificate was found in keystore - Signed by "CN="Oracle America, Inc.", OU=Software Engineering, O="Oracle America, Inc.", L=Redwood City, ST=California, C=US" Digest algorithm: SHA-256 Signature algorithm: SHA256withRSA, 2048-bit key Timestamped by "CN=Symantec Time Stamping Services Signer - G4, O=Symantec Corporation, C=US" on Tue Sep 12 20:08:49 UTC 2017 Timestamp digest algorithm: SHA-1 Timestamp signature algorithm: SHA1withRSA, 2048-bit key jar verified. The signer certificate expired on 2018-02-01. However, the JAR will be valid until the timestamp expires on 2020-12-29. EXAMPLE OF 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 $JAVA_HOME/lib/security/cacerts -verify -verbose -certs ButtonDemo.jar s k 866 Tue Sep 12 20:08:48 EDT 2017 META-INF/MANIFEST.MF >>> Signer X.509, CN="Oracle America, Inc.", OU=Software Engineering, O="Oracle America, Inc.", L=Redwood City, ST=California, C=US [certificate is valid from 2017-01-30, 7:00 PM to 2018-02-01, 6:59 PM] X.509, CN=Symantec Class 3 SHA256 Code Signing CA, OU=Symantec Trust Network, O=Symantec Corporation, C=US [certificate is valid from 2013-12-09, 7:00 PM to 2023-12-09, 6:59 PM] X.509, CN=VeriSign Class 3 Public Primary Certification Authority - G5, OU="(c) 2006 VeriSign, Inc. - For authorized use only", OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US (verisignclass3g5ca [jdk]) [trusted certificate] >>> TSA X.509, CN=Symantec Time Stamping Services Signer - G4, O=Symantec Corporation, C=US [certificate is valid from 2012-10-17, 8:00 PM to 2020-12-29, 6:59 PM] X.509, CN=Symantec Time Stamping Services CA - G2, O=Symantec Corporation, C=US [certificate is valid from 2012-12-20, 7:00 PM to 2020-12-30, 6:59 PM] 825 Tue Sep 12 20:08:48 EDT 2017 META-INF/ORACLE_C.SF 7475 Tue Sep 12 20:08:48 EDT 2017 META-INF/ORACLE_C.RSA 0 Tue Sep 12 20:07:54 EDT 2017 META-INF/ 0 Tue Sep 12 20:07:16 EDT 2017 components/ 0 Tue Sep 12 20:07:16 EDT 2017 components/images/ smk 523 Tue Sep 12 20:07:16 EDT 2017 components/ButtonDemo$1.class [entry was signed on 2017-09-12, 4:08 PM] >>> Signer X.509, CN="Oracle America, Inc.", OU=Software Engineering, O="Oracle America, Inc.", L=Redwood City, ST=California, C=US [certificate is valid from 2017-01-30, 7:00 PM to 2018-02-01, 6:59 PM] X.509, CN=Symantec Class 3 SHA256 Code Signing CA, OU=Symantec Trust Network, O=Symantec Corporation, C=US [certificate is valid from 2013-12-09, 7:00 PM to 2023-12-09, 6:59 PM] X.509, CN=VeriSign Class 3 Public Primary Certification Authority - G5, OU="(c) 2006 VeriSign, Inc. - For authorized use only", OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US (verisignclass3g5ca [jdk]) [trusted certificate] >>> TSA X.509, CN=Symantec Time Stamping Services Signer - G4, O=Symantec Corporation, C=US [certificate is valid from 2012-10-17, 8:00 PM to 2020-12-29, 6:59 PM] X.509, CN=Symantec Time Stamping Services CA - G2, O=Symantec Corporation, C=US [certificate is valid from 2012-12-20, 7:00 PM to 2020-12-30, 6:59 PM] smk 3440 Tue Sep 12 20:07:16 EDT 2017 components/ButtonDemo.class ... smk 2346 Tue Sep 12 20:07:16 EDT 2017 components/ButtonDemo.jnlp ... smk 172 Tue Sep 12 20:07:16 EDT 2017 components/images/left.gif ... smk 235 Tue Sep 12 20:07:16 EDT 2017 components/images/middle.gif ... smk 172 Tue Sep 12 20:07:16 EDT 2017 components/images/right.gif ... s = signature was verified m = entry is listed in manifest k = at least one certificate was found in keystore - Signed by "CN="Oracle America, Inc.", OU=Software Engineering, O="Oracle America, Inc.", L=Redwood City, ST=California, C=US" Digest algorithm: SHA-256 Signature algorithm: SHA256withRSA, 2048-bit key Timestamped by "CN=Symantec Time Stamping Services Signer - G4, O=Symantec Corporation, C=US" on Tue Sep 12 20:08:49 UTC 2017 Timestamp digest algorithm: SHA-1 Timestamp signature algorithm: SHA1withRSA, 2048-bit key jar verified. The signer certificate expired on 2018-02-01. However, the JAR will be valid until the timestamp expires on 2020-12-29. If the certificate for a signer isn't an X.509 certificate, then there is no distinguished name information. In that case, just the certifi- cate 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). JDK 21 2023 JARSIGNER(1)
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