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## net.i2p.crypto
Class TrustedUpdate

    java.lang.Object
      net.i2p.crypto.TrustedUpdate

    public class TrustedUpdate

extends Object

Handles DSA signing and verification of update files.

For convenience this class also makes certain operations available via the command line. These can be invoked as follows:

     java net.i2p.crypto.TrustedUpdate keygen       publicKeyFile privateKeyFile
     java net.i2p.crypto.TrustedUpdate showversion  signedFile
     java net.i2p.crypto.TrustedUpdate sign         inputFile signedFile privateKeyFile version
     java net.i2p.crypto.TrustedUpdate verifysig    signedFile
     java net.i2p.crypto.TrustedUpdate verifyupdate signedFile

Author:
  jrandom and smeghead

Field Summary
`static int` | `HEADER_BYTES`

Constructor Summary
`TrustedUpdate()` Constructs a new `TrustedUpdate` with the default global context.
`TrustedUpdate(I2PAppContext context)` Constructs a new `TrustedUpdate` with the given `I2PAppContext`.

Method Summary
`boolean` | `addKey(String key, String name)` Duplicate keys or names rejected, except that duplicate empty names are allowed
`String` | `getTrustedKeysString()` Fetches the trusted keys for the current instance.
`static String` | `getVersionString(File signedFile)` Reads the version string from a signed update file.
`static String` | `getVersionString(InputStream inputStream)` Reads the version string from an input stream
`boolean` | `haveKey(String key)` Do we know about the following key?
`boolean` | `isUpdatedVersion(String currentVersion, File signedFile)` Verifies that the version of the given signed update file is newer than `currentVersion`.
`static void` | `main(String[] args)` Parses command line arguments when this class is used from the command line.
`String` | `migrateFile(File signedFile, File outputFile)` Extract the file.
`String` | `migrateVerified(String currentVersion, File signedFile, File outputFile)` Verifies the signature of a signed update file, and if it's valid and the file's version is newer than the given current version, migrates the data out of `signedFile` and into `outputFile`.
`static boolean` | `needsUpdate(String currentVersion, String newVersion)` Checks if the given version is newer than the given current version.
`String` | `newVersion()` version in the .sud file, valid only after calling migrateVerified()
`Signature` | `sign(String inputFile, String signedFile, SigningPrivateKey signingPrivateKey, String version)` Uses the given `SigningPrivateKey` to sign the given input file along with its version string using DSA.
`Signature` | `sign(String inputFile, String signedFile, String privateKeyFile, String version)` Uses the given private key to sign the given input file along with its version string using DSA.
`boolean` | `verify(File signedFile)` Verifies the DSA signature of a signed update file.
`boolean` | `verify(File signedFile, SigningPublicKey signingPublicKey)` Verifies the DSA signature of a signed update file.
`boolean` | `verify(String signedFile, String publicKeyFile)` Verifies the DSA signature of a signed update file.
`String` | `verifyAndGetSigner(File signedFile)` Verifies the DSA signature of a signed update file.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### HEADER_BYTES

    public static final int HEADER_BYTES

See Also:
  Constant Field Values

Constructor Detail

### TrustedUpdate

    public TrustedUpdate()

  Constructs a new `TrustedUpdate` with the default global context.

### TrustedUpdate

    public TrustedUpdate(I2PAppContext context)

  Constructs a new `TrustedUpdate` with the given `I2PAppContext`.

  Parameters:
    `context` - An instance of `I2PAppContext`.

Method Detail

### addKey

    public boolean addKey(String key,
                          String name)

  Duplicate keys or names rejected, except that duplicate empty names are allowed

  Parameters:
    `key` - 172 character base64 string
    `name` - non-null but "" ok
  Returns:
    true if successful
  Since:
    0.7.12

### haveKey

    public boolean haveKey(String key)

  Do we know about the following key?

  Since:
    0.7.12

### main

    public static void main(String[] args)

  Parses command line arguments when this class is used from the command line. Exits 1 on failure so this can be used in scripts.

  Parameters:
    `args` - Command line parameters.

### needsUpdate

    public static final boolean needsUpdate(String currentVersion,
                                            String newVersion)

  Checks if the given version is newer than the given current version.

  Parameters:
    `currentVersion` - The current version.
    `newVersion` - The version to test.
  Returns:
    `true` if the given version is newer than the current version, otherwise `false`.

### getTrustedKeysString

    public String getTrustedKeysString()

  Fetches the trusted keys for the current instance. We could sort it but don't bother.

  Returns:
    A `String` containing the trusted keys, delimited by CR LF line breaks.

### getVersionString

    public static String getVersionString(File signedFile)

  Reads the version string from a signed update file.

  Parameters:
    `signedFile` - A signed update file.
  Returns:
    The version string read, or an empty string if no version string is present.

### getVersionString

    public static String getVersionString(InputStream inputStream)

  Reads the version string from an input stream

  Parameters:
    `inputStream` - containing at least 56 bytes
  Returns:
    The version string read, or an empty string if no version string is present.
  Since:
    0.7.12

### newVersion

    public String newVersion()

  version in the .sud file, valid only after calling migrateVerified()

### isUpdatedVersion

    public boolean isUpdatedVersion(String currentVersion,
                                    File signedFile)

  Verifies that the version of the given signed update file is newer than `currentVersion`.

  Parameters:
    `currentVersion` - The current version to check against.
    `signedFile` - The signed update file.
  Returns:
    `true` if the signed update file's version is newer than the current version, otherwise `false`.

### migrateVerified

    public String migrateVerified(String currentVersion,
                                  File signedFile,
                                  File outputFile)

  Verifies the signature of a signed update file, and if it's valid and the file's version is newer than the given current version, migrates the data out of `signedFile` and into `outputFile`.

  Parameters:
    `currentVersion` - The current version to check against.
    `signedFile` - A signed update file.
    `outputFile` - The file to write the verified data to.
  Returns:
    `null` if the signature and version were valid and the data was moved, and an error `String` otherwise.

### migrateFile

    public String migrateFile(File signedFile,
                              File outputFile)

  Extract the file. Skips and ignores the signature and version. No verification.

  Parameters:
    `signedFile` - A signed update file.
    `outputFile` - The file to write the verified data to.
  Returns:
    `null` if the data was moved, and an error `String` otherwise.
  Since:
    0.7.12

### sign

    public Signature sign(String inputFile,
                          String signedFile,
                          String privateKeyFile,
                          String version)

  Uses the given private key to sign the given input file along with its version string using DSA. The output will be a signed update file where the first 40 bytes are the resulting DSA signature, the next 16 bytes are the input file's version string encoded in UTF-8 (padded with trailing `0h` characters if necessary), and the remaining bytes are the raw bytes of the input file.

  Parameters:
    `inputFile` - The file to be signed.
    `signedFile` - The signed update file to write.
    `privateKeyFile` - The name of the file containing the private key to sign `inputFile` with.
    `version` - The version string of the input file. If this is longer than 16 characters it will be truncated.
  Returns:
    An instance of `Signature`, or `null` if there was an error.

### sign

    public Signature sign(String inputFile,
                          String signedFile,
                          SigningPrivateKey signingPrivateKey,
                          String version)

  Uses the given `SigningPrivateKey` to sign the given input file along with its version string using DSA. The output will be a signed update file where the first 40 bytes are the resulting DSA signature, the next 16 bytes are the input file's version string encoded in UTF-8 (padded with trailing `0h` characters if necessary), and the remaining bytes are the raw bytes of the input file.

  Parameters:
    `inputFile` - The file to be signed.
    `signedFile` - The signed update file to write.
    `signingPrivateKey` - An instance of `SigningPrivateKey` to sign `inputFile` with.
    `version` - The version string of the input file. If this is longer than 16 characters it will be truncated.
  Returns:
    An instance of `Signature`, or `null` if there was an error.

### verify

    public boolean verify(File signedFile)

  Verifies the DSA signature of a signed update file.

  Parameters:
    `signedFile` - The signed update file to check.
  Returns:
    `true` if the file has a valid signature, otherwise `false`.

### verifyAndGetSigner

    public String verifyAndGetSigner(File signedFile)

  Verifies the DSA signature of a signed update file.

  Parameters:
    `signedFile` - The signed update file to check.
  Returns:
    signer (could be empty string) or null if invalid
  Since:
    0.7.12

### verify

    public boolean verify(String signedFile,
                          String publicKeyFile)

  Verifies the DSA signature of a signed update file.

  Parameters:
    `signedFile` - The signed update file to check.
    `publicKeyFile` - A file containing the public key to use for verification.
  Returns:
    `true` if the file has a valid signature, otherwise `false`.

### verify

    public boolean verify(File signedFile,
                          SigningPublicKey signingPublicKey)

  Verifies the DSA signature of a signed update file.

  Parameters:
    `signedFile` - The signed update file to check.
    `signingPublicKey` - An instance of `SigningPublicKey` to use for verification.
  Returns:
    `true` if the file has a valid signature, otherwise `false`.

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