Function hpkeOpen

hpkeOpen(
    options: {
        recipientPrivateKey: string;
        encapsulatedKey: string;
        ciphertext: string;
        info?: string;
        aad?: string;
        suite?: HpkeSuiteOptions;
        psk?: HpkePskOptions;
    },
): HpkeOpenResult
Decrypt (open) an HPKE ciphertext.

Decapsulates the shared secret using the recipient's private key, re-derives the AEAD key material, and decrypts the ciphertext.
Parameters
- options: {
      recipientPrivateKey: string;
      encapsulatedKey: string;
      ciphertext: string;
      info?: string;
      aad?: string;
      suite?: HpkeSuiteOptions;
      psk?: HpkePskOptions;
  }
  Open options.
  - recipientPrivateKey: string
    
    Hex-encoded recipient private key.
  - encapsulatedKey: string
    
    Hex-encoded encapsulated key (from seal).
  - ciphertext: string
    
    Hex-encoded ciphertext (from seal).
  - Optionalinfo?: string
    
    Hex-encoded info string (must match seal).
  - Optionalaad?: string
    
    Hex-encoded additional authenticated data (must match seal).
  - Optionalsuite?: HpkeSuiteOptions
    
    Cipher suite selection (must match seal).
  - Optionalpsk?: HpkePskOptions
    
    Pre-shared key options (must match seal).
Returns HpkeOpenResult
Hex-encoded plaintext.
Example
```
const kp = hpkeGenerateKeyPair();
const sealed = hpkeSeal({
  recipientPublicKey: kp.publicKey,
  plaintext: "48656c6c6f",
});
const opened = hpkeOpen({
  recipientPrivateKey: kp.privateKey,
  encapsulatedKey: sealed.encapsulatedKey,
  ciphertext: sealed.ciphertext,
});
console.log(opened.plaintext); // "48656c6c6f"
```
- Defined in modern/hpke.ts:577