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Dec 12, 2016  The User Library folder is hidden by default in MacOS Catalina, MacOS Mojave, macOS High Sierra, and macOS Sierra, but some advanced users may wish to show and access the /Library/ folder, which contains preference files, caches, and application support data. May 30, 2019  How to find the Library folder on Mac (macOS Sierra, Mojave or Catalina) Get the Library folder – Way 1. Open Finder window. Click Go in a Menu Bar → select Go to Folder. Or use the Cmd+Shift+G key shortcut. TRAKTOR cannot find the iTunes library file in the specified location; iTunes does not share its XML library file with other applications; TRAKTOR Cannot find the iTunes Library File. TRAKTOR needs to be pointed to the file 'iTunes Music Library.xml', which iTunes provides in order to enable third-party access to its library. Jul 22, 2011  Fortunately, this is easy to reverse and if you wish you can switch the behavior and instead show Library all the time with a quick terminal command. This tutorial will detail four different ways to access the User Library folder in Mac OS X from Mt Lion and beyond.

Mar 18, 2020  You can't move your library to a disk that's used for Time Machine backups. If the volume isn't formatted APFS or Mac OS Extended (Journaled), or has been used for Time Machine backups but hasn't been erased, this checkbox will either not be present,.

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  • Class

Class Mac

    • javax.crypto.Mac
  • All Implemented Interfaces:
    Cloneable

    This class provides the functionality of a 'Message Authentication Code' (MAC) algorithm.

    A MAC provides a way to check the integrity of information transmitted over or stored in an unreliable medium, based on a secret key. Typically, message authentication codes are used between two parties that share a secret key in order to validate information transmitted between these parties.

    A MAC mechanism that is based on cryptographic hash functions is referred to as HMAC. HMAC can be used with any cryptographic hash function, e.g., SHA256 or SHA384, in combination with a secret shared key. HMAC is specified in RFC 2104.

    Every implementation of the Java platform is required to support the following standard Mac algorithms:

    • HmacMD5
    • HmacSHA1
    • HmacSHA256
    These algorithms are described in the Mac section of the Java Cryptography Architecture Standard Algorithm Name Documentation. Consult the release documentation for your implementation to see if any other algorithms are supported.
    Since:
    1.4

    • Constructor Summary

      Constructors
      ModifierConstructor and Description
      protected Mac(MacSpi macSpi, Provider provider, String algorithm)

    • Method Summary

      Methods
      Modifier and TypeMethod and Description
      Objectclone()
      Returns a clone if the provider implementation is cloneable.
      byte[]doFinal()
      byte[]doFinal(byte[] input)
      Processes the given array of bytes and finishes the MAC operation.
      voiddoFinal(byte[] output, int outOffset)
      StringgetAlgorithm()
      Returns the algorithm name of this Mac object.
      static MacgetInstance(String algorithm)
      Returns a Mac object that implements the specified MAC algorithm.
      static MacgetInstance(String algorithm, Provider provider)
      Returns a Mac object that implements the specified MAC algorithm.
      static MacgetInstance(String algorithm, String provider)
      Returns a Mac object that implements the specified MAC algorithm.
      intgetMacLength()
      ProvidergetProvider()
      Returns the provider of this Mac object.
      voidinit(Key key)
      voidinit(Key key, AlgorithmParameterSpec params)
      Initializes this Mac object with the given key and algorithm parameters.
      voidreset()
      voidupdate(byte input)
      Processes the given byte.
      voidupdate(byte[] input)
      voidupdate(byte[] input, int offset, int len)
      Processes the first len bytes in input, starting at offset inclusive.
      voidupdate(ByteBuffer input)
      Processes input.remaining() bytes in the ByteBuffer input, starting at input.position().

      • Methods inherited from class java.lang.Object

        equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • Mac

        Parameters:
        macSpi - the delegate
        provider - the provider
        algorithm - the algorithm

    • Method Detail

      • getAlgorithm

        Returns the algorithm name of this Mac object.

        This is the same name that was specified in one of the getInstance calls that created this Mac object.

        Returns:
        the algorithm name of this Mac object.

      • getInstance

        Returns a Mac object that implements the specified MAC algorithm.

        This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Mac object encapsulating the MacSpi implementation from the first Provider that supports the specified algorithm is returned.

        Note that the list of registered providers may be retrieved via the Security.getProviders() method.

        Parameters:
        algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
        Returns:
        the new Mac object.
        Throws:
        NoSuchAlgorithmException - if no Provider supports a MacSpi implementation for the specified algorithm.
        See Also:
        Provider

      • getInstance

        Returns a Mac object that implements the specified MAC algorithm.

        A new Mac object encapsulating the MacSpi implementation from the specified provider is returned. The specified provider must be registered in the security provider list.

        Note that the list of registered providers may be retrieved via the Security.getProviders() method.

        Parameters:
        algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
        provider - the name of the provider.
        Returns:
        the new Mac object.
        Throws:
        NoSuchAlgorithmException - if a MacSpi implementation for the specified algorithm is not available from the specified provider.
        NoSuchProviderException - if the specified provider is not registered in the security provider list.
        IllegalArgumentException - if the provider is null or empty.
        See Also:
        Provider

      • getInstance

        Returns a Mac object that implements the specified MAC algorithm.

        A new Mac object encapsulating the MacSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.

        Parameters:
        algorithm - the standard name of the requested MAC algorithm. See the Mac section in the Java Cryptography Architecture Standard Algorithm Name Documentation for information about standard algorithm names.
        provider - the provider.
        Returns:
        the new Mac object.
        Throws:
        NoSuchAlgorithmException - if a MacSpi implementation for the specified algorithm is not available from the specified Provider object.
        IllegalArgumentException - if the provider is null.
        See Also:
        Provider

      • getProvider

        Returns:
        the provider of this Mac object.

      • getMacLength

        Returns the length of the MAC in bytes.
        Returns:
        the MAC length in bytes.

      • init

        Parameters:
        key - the key.
        Throws:
        InvalidKeyException - if the given key is inappropriate for initializing this MAC.

      • init

        Initializes this Mac object with the given key and algorithm parameters.
        Parameters:
        key - the key.
        params - the algorithm parameters.
        Throws:
        InvalidKeyException - if the given key is inappropriate for initializing this MAC.
        InvalidAlgorithmParameterException - if the given algorithm parameters are inappropriate for this MAC.

      • update

        Parameters:
        input - the input byte to be processed.
        Throws:
        IllegalStateException - if this Mac has not been initialized.

      • update

        Processes the given array of bytes.
        Parameters:
        input - the array of bytes to be processed.
        Throws:
        IllegalStateException - if this Mac has not been initialized.

      • update

        Processes the first len bytes in input, starting at offset inclusive.
        Parameters:
        input - the input buffer.
        offset - the offset in input where the input starts.
        len - the number of bytes to process.
        Throws:
        IllegalStateException - if this Mac has not been initialized.

      • update

        Processes input.remaining() bytes in the ByteBuffer input, starting at input.position(). Upon return, the buffer's position will be equal to its limit; its limit will not have changed.
        Parameters:
        input - the ByteBuffer
        Throws:
        IllegalStateException - if this Mac has not been initialized.
        Since:
        1.5

      • doFinal

        Finishes the MAC operation.

        A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).

        Returns:
        the MAC result.
        Throws:
        IllegalStateException - if this Mac has not been initialized.

      • doFinal

        Finishes the MAC operation.

        A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).

        The MAC result is stored in output, starting at outOffset inclusive.

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        Parameters:
        output - the buffer where the MAC result is stored
        outOffset - the offset in output where the MAC is stored
        Throws:
        ShortBufferException - if the given output buffer is too small to hold the result
        IllegalStateException - if this Mac has not been initialized.

      • doFinal

        Processes the given array of bytes and finishes the MAC operation.

        A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).

        Parameters:
        input - data in bytes
        Returns:
        the MAC result.
        Throws:
        IllegalStateException - if this Mac has not been initialized.

      • reset

        Resets this Mac object.

        A call to this method resets this Mac object to the state it was in when previously initialized via a call to init(Key) or init(Key, AlgorithmParameterSpec). That is, the object is reset and available to generate another MAC from the same key, if desired, via new calls to update and doFinal. (In order to reuse this Mac object with a different key, it must be reinitialized via a call to init(Key) or init(Key, AlgorithmParameterSpec).

      • clone

        Returns a clone if the provider implementation is cloneable.
        Overrides:
        clone in class Object
        Returns:
        a clone if the provider implementation is cloneable.
        Throws:
        CloneNotSupportedException - if this is called on a delegate that does not support Cloneable.
        See Also:
        Cloneable
  • Class
  • Summary:
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  • Detail:
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Your Photos library holds all your photos, albums, slideshows, and print projects. If your library is large, and you want to free up storage space on your Mac, turn on iCloud Photo Library and use Optimize Mac Storage, or move your library to an external drive.

Before you start, be sure to back up your library.

Prepare your drive

You can store your library on an external storage device, such as a USB or Thunderbolt drive formatted as APFS or Mac OS Extended (Journaled).1 Find out how to check the format of your external storage device.

To prevent data loss, Apple doesn't recommend storing photo libraries on external storage devices like SD cards and USB flash drives, or drives that are shared on a network.

Move your Photos library to an external storage device

  1. Quit Photos.
  2. In the Finder, go to the external drive where you want to store your library.
  3. In another Finder window, find your library. The default location is Users > [username] > Pictures, and it's named Photos Library.
  4. Drag your library to its new location on the external drive. If you see an error, select your external drive's icon in the Finder, then choose File > Get Info. If the information under Sharing & Permissions isn't visible, click , then make sure the 'Ignore ownership on this volume' checkbox is selected. If it's not selected, click to unlock it, enter an administrator name and password, then select the checkbox.2

  5. After the move is finished, double-click Photos Library in its new location to open it.
  6. If you use iCloud Photo Library, designate this library as the System Photo Library.

Delete original library to save space

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After you open your library from its new location and make sure that it works as expected, you can delete the library from its original location.

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In a Finder window, go back to your Pictures folder (or whichever folder you copied your library from) and move Photos Library to the trash. Then choose Finder > Empty Trash to delete the library and reclaim disk space.

Open another Photos library

If you have multiple libraries, here's how to open a different one:

  1. Quit Photos.
  2. Press and hold the Option key while you open Photos.
  3. Select the library that you want to open, then click Choose Library.

Photos uses this library until you open a different one.

Learn more

If you have a permissions issue with your library, you might be able to resolve the issue by using the Photos library repair tool.

1. You can't move your library to a disk that's used for Time Machine backups.

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2. If the volume isn't formatted APFS or Mac OS Extended (Journaled), or has been used for Time Machine backups but hasn't been erased, this checkbox will either not be present, or won't be selectable after unlocking. Erase and reformat the drive for this option to be available.