Encryption over transit.

[CTLalit]

https://wizrocket.atlassian.net/browse/SDK-4341

Summary by CodeRabbit

• New Features
  • Enhanced encryption capabilities with improved public key management and secure response handling.
• Refactor
  • Streamlined cryptographic and network communication flows for better security and performance.
• Tests
  • Expanded test coverage to verify encryption configurations and secure data handling.

These updates further strengthen data security, ensure reliable encrypted communications, and provide a smoother, more robust configuration experience for end-users.

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Walkthrough

This pull request introduces extensive enhancements to encryption and network functionality in the CleverTap SDK. New classes for key management (e.g. CTKeyGenerator) and encryption (e.g. NetworkEncryptionManager, RSAEncryption) have been added, while existing factories and configuration classes are updated with public encryption key properties and methods. Cryptographic modules are refactored to decouple context from key generation. The network layer is restructured with a new Kotlin-based NetworkManager and improved response handling. Corresponding test cases and sample manifest configurations have been added or updated to validate and support the new encryption features.

Changes

File(s)	Summary of Changes
clevertap-core/.../CleverTapFactory.kt, CleverTapInstanceConfig.java, ManifestInfo.java, Constants.java	Updated factories and configurations to integrate encryption: added public encryption key fields, methods, constants, and modified instantiation logic for encryption managers.
clevertap-core/.../cryption/AESGCMCrypt.kt, CTKeyGenerator.kt, CryptExtensions.kt, CryptFactory.kt, CryptRepository.kt	Refactored cryptography modules: AESGCMCrypt now uses CTKeyGenerator; introduced CTKeyGenerator for key management, Base64 utility extensions, updated CryptFactory to remove context dependency and added RSA encryption support; added methods for local key storage and update.
clevertap-core/.../network/NetworkEncryptionManager.kt, NetworkManager.java, NetworkManager.kt, RSAEncryption.kt, CtApi.kt, EncryptedSendQueueRequestBody.kt, EncryptionResult.kt, Response.kt, UrlConnectionHttpClient.kt, CleverTapResponseDecorator.java	Redesigned network layer: removed old Java NetworkManager and introduced a new Kotlin NetworkManager with enhanced queue management and header handling; added NetworkEncryptionManager for response encryption; integrated RSAEncryption; updated CtApi to use string-based request bodies and conditionally include an encryption header; streamlined HTTP response handling.
clevertap-core/.../test/... (CleverTapFixtures.kt, CleverTapInstanceConfigTest.kt, NetworkManagerTest.kt, CtApiTest.kt, MockHttpClient.kt)	Extended test coverage: added encryption constants; created tests validating encryption configuration and header attachment; updated test mocks to align with new response handling logic.
sample/src/main/AndroidManifest.xml	Modified manifest: removed ad services configuration and added new meta-data for the public encryption key.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant CtApi
    participant NetworkEncryptionManager
    participant AESGCMCrypt
    participant CTKeyGenerator

    Client->>CtApi: sendQueue(isEncrypted=true, body)
    CtApi->>CtApi: Add encryption header if enabled
    CtApi->>NetworkEncryptionManager: encryptResponse(response)
    NetworkEncryptionManager->>CTKeyGenerator: Retrieve/generate session key
    NetworkEncryptionManager->>AESGCMCrypt: performCryptOperation(response, sessionKey)
    AESGCMCrypt-->>NetworkEncryptionManager: Return EncryptionResult
    NetworkEncryptionManager-->>CtApi: Encrypted response payload

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[darshanclevertap]

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