# ChildSaProposal
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary:[Nested Classes](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#nestedclasses)\|[Inherited Constants](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#inhconstants)\|[Methods](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#inhmethods)
# ChildSaProposal
*** ** * ** ***
[Kotlin](https://developer.android.com/reference/kotlin/android/net/ipsec/ike/ChildSaProposal "View this page in Kotlin")\|Java
`
public
final
class
ChildSaProposal
`
`
``
extends `[SaProposal](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal)`
``
`
|---|---|---------------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [android.net.ipsec.ike.SaProposal](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal) ||
| | ↳ | android.net.ipsec.ike.ChildSaProposal |
*** ** * ** ***
ChildSaProposal represents a proposed configuration to negotiate a Child SA.
ChildSaProposal will contain cryptograhic algorithms and key generation materials for the negotiation of a Child SA.
User must provide at least one valid ChildSaProposal when they are creating a new Child SA.
**See also:**
- [RFC 7296, Internet Key Exchange Protocol Version 2 (IKEv2)](https://tools.ietf.org/html/rfc7296#section-3.3)
## Summary
| ### Nested classes ||
|----------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` class` | [ChildSaProposal.Builder](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal.Builder) This class is used to incrementally construct a ChildSaProposal. |
| ### Inherited constants |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From class[android.net.ipsec.ike.SaProposal](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal) |-------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | [DH_GROUP_1024_BIT_MODP](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_1024_BIT_MODP) 1024-bit MODP Diffie-Hellman Group. | | `int` | [DH_GROUP_1536_BIT_MODP](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_1536_BIT_MODP) 1536-bit MODP Diffie-Hellman Group. | | `int` | [DH_GROUP_2048_BIT_MODP](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_2048_BIT_MODP) 2048-bit MODP Diffie-Hellman Group. | | `int` | [DH_GROUP_3072_BIT_MODP](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_3072_BIT_MODP) 3072-bit MODP Diffie-Hellman Group. | | `int` | [DH_GROUP_4096_BIT_MODP](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_4096_BIT_MODP) 4096-bit MODP Diffie-Hellman Group. | | `int` | [DH_GROUP_CURVE_25519](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_CURVE_25519) Elliptic Curve Diffie-Hellman 25519. | | `int` | [DH_GROUP_NONE](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#DH_GROUP_NONE) None Diffie-Hellman Group. | | `int` | [ENCRYPTION_ALGORITHM_3DES](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_3DES) 3DES Encryption/Ciphering Algorithm. | | `int` | [ENCRYPTION_ALGORITHM_AES_CBC](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_AES_CBC) AES-CBC Encryption/Ciphering Algorithm. | | `int` | [ENCRYPTION_ALGORITHM_AES_CTR](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_AES_CTR) AES-CTR Encryption/Ciphering Algorithm. | | `int` | [ENCRYPTION_ALGORITHM_AES_GCM_12](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_AES_GCM_12) AES-GCM Authentication/Integrity + Encryption/Ciphering Algorithm with 12-octet ICV (truncation). | | `int` | [ENCRYPTION_ALGORITHM_AES_GCM_16](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_AES_GCM_16) AES-GCM Authentication/Integrity + Encryption/Ciphering Algorithm with 16-octet ICV (truncation). | | `int` | [ENCRYPTION_ALGORITHM_AES_GCM_8](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_AES_GCM_8) AES-GCM Authentication/Integrity + Encryption/Ciphering Algorithm with 8-octet ICV (truncation). | | `int` | [ENCRYPTION_ALGORITHM_CHACHA20_POLY1305](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#ENCRYPTION_ALGORITHM_CHACHA20_POLY1305) ChaCha20-Poly1305 Authentication/Integrity + Encryption/Ciphering Algorithm with 16-octet ICV (truncation). | | `int` | [INTEGRITY_ALGORITHM_AES_CMAC_96](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_AES_CMAC_96) AES-CMAC-96 Authentication/Integrity Algorithm. | | `int` | [INTEGRITY_ALGORITHM_AES_XCBC_96](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_AES_XCBC_96) AES-XCBC-96 Authentication/Integrity Algorithm. | | `int` | [INTEGRITY_ALGORITHM_HMAC_SHA1_96](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_HMAC_SHA1_96) HMAC-SHA1 Authentication/Integrity Algorithm. | | `int` | [INTEGRITY_ALGORITHM_HMAC_SHA2_256_128](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_HMAC_SHA2_256_128) HMAC-SHA256 Authentication/Integrity Algorithm with 128-bit truncation. | | `int` | [INTEGRITY_ALGORITHM_HMAC_SHA2_384_192](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_HMAC_SHA2_384_192) HMAC-SHA384 Authentication/Integrity Algorithm with 192-bit truncation. | | `int` | [INTEGRITY_ALGORITHM_HMAC_SHA2_512_256](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_HMAC_SHA2_512_256) HMAC-SHA512 Authentication/Integrity Algorithm with 256-bit truncation. | | `int` | [INTEGRITY_ALGORITHM_NONE](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#INTEGRITY_ALGORITHM_NONE) None Authentication/Integrity Algorithm. | | `int` | [KEY_LEN_AES_128](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#KEY_LEN_AES_128) AES Encryption/Ciphering Algorithm key length 128 bits. | | `int` | [KEY_LEN_AES_192](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#KEY_LEN_AES_192) AES Encryption/Ciphering Algorithm key length 192 bits. | | `int` | [KEY_LEN_AES_256](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#KEY_LEN_AES_256) AES Encryption/Ciphering Algorithm key length 256 bits. | | `int` | [KEY_LEN_UNUSED](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#KEY_LEN_UNUSED) Key length unused. | | `int` | [PSEUDORANDOM_FUNCTION_AES128_CMAC](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#PSEUDORANDOM_FUNCTION_AES128_CMAC) AES128-CMAC Pseudorandom Function. | | `int` | [PSEUDORANDOM_FUNCTION_AES128_XCBC](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#PSEUDORANDOM_FUNCTION_AES128_XCBC) AES128-XCBC Pseudorandom Function. | | `int` | [PSEUDORANDOM_FUNCTION_HMAC_SHA1](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#PSEUDORANDOM_FUNCTION_HMAC_SHA1) HMAC-SHA1 Pseudorandom Function. | | `int` | [PSEUDORANDOM_FUNCTION_SHA2_256](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#PSEUDORANDOM_FUNCTION_SHA2_256) HMAC-SHA2-256 Pseudorandom Function. | | `int` | [PSEUDORANDOM_FUNCTION_SHA2_384](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#PSEUDORANDOM_FUNCTION_SHA2_384) HMAC-SHA2-384 Pseudorandom Function. | | `int` | [PSEUDORANDOM_FUNCTION_SHA2_512](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#PSEUDORANDOM_FUNCTION_SHA2_512) HMAC-SHA2-384 Pseudorandom Function. | |
| ### Public methods ||
|--------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` boolean` | ` `[equals](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` o) ` Indicates whether some other object is "equal to" this one. |
| ` static `[Set](https://developer.android.com/reference/java/util/Set)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | ` `[getSupportedEncryptionAlgorithms](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#getSupportedEncryptionAlgorithms())`() ` Returns supported encryption algorithms for Child SA proposal negotiation. |
| ` static `[Set](https://developer.android.com/reference/java/util/Set)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | ` `[getSupportedIntegrityAlgorithms](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#getSupportedIntegrityAlgorithms())`() ` Returns supported integrity algorithms for Child SA proposal negotiation. |
| ` int` | ` `[hashCode](https://developer.android.com/reference/android/net/ipsec/ike/ChildSaProposal#hashCode())`() ` Returns a hash code value for the object. |
| ### Inherited methods |
|-----------------------|---|
| From class` `[android.net.ipsec.ike.SaProposal](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal)` ` |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` boolean` | ` `[equals](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` o) ` Indicates whether some other object is "equal to" this one. | | ` `[List](https://developer.android.com/reference/java/util/List)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | ` `[getDhGroups](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#getDhGroups())`() ` Gets all proposed Diffie-Hellman groups | | ` `[List](https://developer.android.com/reference/java/util/List)`<`[Pair](https://developer.android.com/reference/android/util/Pair)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`, `[Integer](https://developer.android.com/reference/java/lang/Integer)`>>` | ` `[getEncryptionAlgorithms](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#getEncryptionAlgorithms())`() ` Gets all proposed encryption algorithms | | ` `[List](https://developer.android.com/reference/java/util/List)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | ` `[getIntegrityAlgorithms](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#getIntegrityAlgorithms())`() ` Gets all proposed integrity algorithms | | ` static `[Set](https://developer.android.com/reference/java/util/Set)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | ` `[getSupportedDhGroups](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#getSupportedDhGroups())`() ` Returns supported DH groups for IKE and Child SA proposal negotiation. | | ` int` | ` `[hashCode](https://developer.android.com/reference/android/net/ipsec/ike/SaProposal#hashCode())`() ` Returns a hash code value for the object. | ||
| From class` `[java.lang.Object](https://developer.android.com/reference/java/lang/Object)` ` |--------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object. | | ` boolean` | ` `[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` `[finalize](https://developer.android.com/reference/java/lang/Object#finalize())`() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final `[Class](https://developer.android.com/reference/java/lang/Class)`` | ` `[getClass](https://developer.android.com/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this`Object`. | | ` int` | ` `[hashCode](https://developer.android.com/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object. | | ` final void` | ` `[notify](https://developer.android.com/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` `[notifyAll](https://developer.android.com/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[toString](https://developer.android.com/reference/java/lang/Object#toString())`() ` Returns a string representation of the object. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long,%20int))`(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long))`(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait())`() ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*. | ||
## Public methods
### equals
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean equals (Object o)
```
Indicates whether some other object is "equal to" this one.
The`equals`method implements an equivalence relation on non-null object references:
- It is*reflexive* : for any non-null reference value`x`,`x.equals(x)`should return`true`.
- It is*symmetric* : for any non-null reference values`x`and`y`,`x.equals(y)`should return`true`if and only if`y.equals(x)`returns`true`.
- It is*transitive* : for any non-null reference values`x`,`y`, and`z`, if`x.equals(y)`returns`true`and`y.equals(z)`returns`true`, then`x.equals(z)`should return`true`.
- It is*consistent* : for any non-null reference values`x`and`y`, multiple invocations of`x.equals(y)`consistently return`true`or consistently return`false`, provided no information used in`equals`comparisons on the objects is modified.
- For any non-null reference value`x`,`x.equals(null)`should return`false`.
An equivalence relation partitions the elements it operates on into*equivalence classes*; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.
| Parameters ||
|-----|--------------------------------------------------------------|
| `o` | `Object`: the reference object with which to compare.
|
| Returns ||
|-----------|-------------------------------------------------------------------------------|
| `boolean` | `true`if this object is the same as the obj argument;`false`otherwise.
|
### getSupportedEncryptionAlgorithms
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static Set getSupportedEncryptionAlgorithms ()
```
Returns supported encryption algorithms for Child SA proposal negotiation.
Some algorithms may not be supported on old devices.
| Returns ||
|----------------------------------------------------------------------------------------------------------------------------------------|------------------------------------|
| [Set](https://developer.android.com/reference/java/util/Set)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | This value cannot be`null`.
|
### getSupportedIntegrityAlgorithms
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static Set getSupportedIntegrityAlgorithms ()
```
Returns supported integrity algorithms for Child SA proposal negotiation.
Some algorithms may not be supported on old devices.
| Returns ||
|----------------------------------------------------------------------------------------------------------------------------------------|------------------------------------|
| [Set](https://developer.android.com/reference/java/util/Set)`<`[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | This value cannot be`null`.
|
### hashCode
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int hashCode ()
```
Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by[HashMap](https://developer.android.com/reference/java/util/HashMap).
The general contract of`hashCode`is:
- Whenever it is invoked on the same object more than once during an execution of a Java application, the`hashCode`method must consistently return the same integer, provided no information used in`equals`comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))method, then calling the`hashCode`method on each of the two objects must produce the same integer result.
- It is*not* required that if two objects are unequal according to the[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))method, then calling the`hashCode`method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
| Returns ||
|-------|-------------------------------------------|
| `int` | a hash code value for this object.
|