Package org.apache.shiro.crypto
Enum OperationMode
- java.lang.Object
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- java.lang.Enum<OperationMode>
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- org.apache.shiro.crypto.OperationMode
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- All Implemented Interfaces:
Serializable
,Comparable<OperationMode>
public enum OperationMode extends Enum<OperationMode>
A cipher mode of operation directs a cipher algorithm how to convert data during the encryption or decryption process. This enum represents all JDK-standard Cipher operation mode names as defined in JDK Security Standard Names, as well as a few more that are well-known and supported by other JCA Providers. Thisenum
exists to provide Shiro end-users type-safety when declaring an operation mode. This helps reduce error by providing a compile-time mechanism to specify a mode and guarantees a valid name that will be recognized by an underlying JCA Provider.Standard or Non-Standard?
All modes listed specify whether they are a JDK standard mode or a non-standard mode. Standard modes are included in all JDK distributions. Non-standard modes can sometimes result in better performance or more secure output, but may not be available on the target JDK platform and rely on an external JCA Provider to be installed. Some providers (like Bouncy Castle) may support these modes however.- Since:
- 1.0
- See Also:
- Block Cipher Modes of Operation
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Enum Constant Summary
Enum Constants Enum Constant Description CBC
Cipher-block Chaining mode, defined in FIPS PUB 81.CCM
Counter with CBC-MAC mode* - for block ciphers with 128 bit block-size only.CFB
CTR
Counter Mode, aka Integer Counter Mode (ICM) and Segmented Integer Counter (SIC).EAX
EAX Mode*.ECB
Electronic Codebook mode, defined in FIPS PUB 81.GCM
Galois/Counter mode* - for block ciphers with 128 bit block-size only.NONE
No mode.OCB
Offset Codebook mode*.OFB
Output Feedback mode, defined in FIPS PUB 81.PCBC
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static OperationMode
valueOf(String name)
Returns the enum constant of this type with the specified name.static OperationMode[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Detail
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CBC
public static final OperationMode CBC
Cipher-block Chaining mode, defined in FIPS PUB 81. This is a standard JDK operation mode and should be supported by all JDK environments.
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CCM
public static final OperationMode CCM
Counter with CBC-MAC mode* - for block ciphers with 128 bit block-size only. See RFC 3610 for AES Ciphers. This mode has essentially been replaced by the more-capableEAX
mode. *THIS IS A NON-STANDARD MODE. It is not guaranteed to be supported across JDK installations. You must ensure you have a JCA Provider that can support this cipher operation mode. Bouncy Castle may be one such provider.
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CFB
public static final OperationMode CFB
Cipher Feedback mode, defined in FIPS PUB 81. This is a standard JDK operation mode and should be supported by all JDK environments.
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CTR
public static final OperationMode CTR
Counter Mode, aka Integer Counter Mode (ICM) and Segmented Integer Counter (SIC). Counter is a simplification ofOFB
and updates the input block as a counter. This is a standard JDK operation mode and should be supported by all JDK environments.
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EAX
public static final OperationMode EAX
EAX Mode*. This is a patent-free but less-effecient alternative toOCB
and has capabilities beyond whatCCM
can provide. *THIS IS A NON-STANDARD MODE. It is not guaranteed to be supported across JDK installations. You must ensure you have a JCA Provider that can support this cipher operation mode. Bouncy Castle may be one such provider.
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ECB
public static final OperationMode ECB
Electronic Codebook mode, defined in FIPS PUB 81. ECB is the only mode that does not require an Initialization Vector, but because of this, can be seen as less secure than operation modes that require an IV. This is a standard JDK operation mode and should be supported by all JDK environments.
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GCM
public static final OperationMode GCM
Galois/Counter mode* - for block ciphers with 128 bit block-size only. *THIS IS A NON-STANDARD MODE. It is not guaranteed to be supported across JDK installations. You must ensure you have a JCA Provider that can support this cipher operation mode. Bouncy Castle may be one such provider.
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NONE
public static final OperationMode NONE
No mode. This is a standard JDK operation mode and should be supported by all JDK environments.
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OCB
public static final OperationMode OCB
Offset Codebook mode*. Parallel mode that provides both message privacy and authenticity in a single pass. This is a very efficient mode, but is patent-encumbered. A less-efficient (two pass) alternative is available by usingEAX
mode. *THIS IS A NON-STANDARD MODE. It is not guaranteed to be supported across JDK installations. You must ensure you have a JCA Provider that can support this cipher operation mode. Bouncy Castle may be one such provider.
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OFB
public static final OperationMode OFB
Output Feedback mode, defined in FIPS PUB 81. This is a standard JDK operation mode and should be supported by all JDK environments.
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PCBC
public static final OperationMode PCBC
Propagating Cipher Block Chaining mode, defined in Kerberos version 4. This is a standard JDK operation mode and should be supported by all JDK environments.
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Method Detail
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values
public static OperationMode[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:for (OperationMode c : OperationMode.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
public static OperationMode valueOf(String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException
- if this enum type has no constant with the specified nameNullPointerException
- if the argument is null
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