bitwarden_core/key_management/

crypto_client.rs

#[cfg(any(feature = "wasm", test))]
use bitwarden_crypto::safe::{PasswordProtectedKeyEnvelope, PasswordProtectedKeyEnvelopeNamespace};
use bitwarden_crypto::{
    BitwardenLegacyKeyBytes, CryptoError, Decryptable, Kdf, PrimitiveEncryptable, RotateableKeySet,
    SymmetricCryptoKey, SymmetricKeyAlgorithm,
};
#[cfg(feature = "internal")]
use bitwarden_crypto::{EncString, UnsignedSharedKey};
use bitwarden_encoding::B64;
#[cfg(feature = "wasm")]
use wasm_bindgen::prelude::*;

use super::crypto::{
    DeriveKeyConnectorError, DeriveKeyConnectorRequest, EnrollAdminPasswordResetError,
    MakeJitMasterPasswordRegistrationResponse, MakeKeyConnectorRegistrationResponse,
    MakeKeyPairResponse, MakeUserMasterPasswordRegistrationResponse, VerifyAsymmetricKeysRequest,
    VerifyAsymmetricKeysResponse, derive_key_connector, make_key_pair,
    make_user_jit_master_password_registration, make_user_key_connector_registration,
    make_user_password_registration, verify_asymmetric_keys,
};
use crate::key_management::V2UpgradeToken;
#[cfg(feature = "uniffi")]
use crate::key_management::crypto::{
    ReinitUserCryptoError, ReinitUserCryptoRequest, reinit_user_crypto,
};
#[cfg(feature = "internal")]
use crate::key_management::{
    SymmetricKeySlotId,
    crypto::{
        DerivePinKeyResponse, InitOrgCryptoRequest, InitUserCryptoRequest, UpdatePasswordResponse,
        derive_pin_key, derive_pin_user_key, enroll_admin_password_reset, get_user_encryption_key,
        initialize_org_crypto, initialize_user_crypto, make_prf_user_key_set,
    },
};
#[expect(deprecated)]
use crate::{
    Client,
    client::encryption_settings::EncryptionSettingsError,
    error::{NotAuthenticatedError, StatefulCryptoError},
    key_management::crypto::{
        CryptoClientError, EnrollPinResponse, MakeKeysError, MakeTdeRegistrationResponse,
        UpdateKdfResponse, UserCryptoV2KeysResponse, enroll_pin, get_v2_rotated_account_keys,
        make_update_kdf, make_update_password, make_user_tde_registration,
        make_v2_keys_for_v1_user,
    },
};

/// A client for the crypto operations.
#[cfg_attr(feature = "wasm", wasm_bindgen)]
pub struct CryptoClient {
    pub(crate) client: crate::Client,
}

#[cfg_attr(feature = "wasm", wasm_bindgen)]
impl CryptoClient {
    /// Initialization method for the user crypto. Needs to be called before any other crypto
    /// operations.
    pub async fn initialize_user_crypto(
        &self,
        req: InitUserCryptoRequest,
    ) -> Result<(), EncryptionSettingsError> {
        initialize_user_crypto(&self.client, req).await
    }

    /// Initialization method for the organization crypto. Needs to be called after
    /// `initialize_user_crypto` but before any other crypto operations.
    pub async fn initialize_org_crypto(
        &self,
        req: InitOrgCryptoRequest,
    ) -> Result<(), EncryptionSettingsError> {
        initialize_org_crypto(&self.client, req).await
    }

    /// Generates a new key pair and encrypts the private key with the provided user key.
    /// Crypto initialization not required.
    pub fn make_key_pair(&self, user_key: B64) -> Result<MakeKeyPairResponse, CryptoError> {
        make_key_pair(user_key)
    }

    /// Verifies a user's asymmetric keys by decrypting the private key with the provided user
    /// key. Returns if the private key is decryptable and if it is a valid matching key.
    /// Crypto initialization not required.
    pub fn verify_asymmetric_keys(
        &self,
        request: VerifyAsymmetricKeysRequest,
    ) -> Result<VerifyAsymmetricKeysResponse, CryptoError> {
        verify_asymmetric_keys(request)
    }

    /// Makes a new signing key pair and signs the public key for the user
    pub fn make_keys_for_user_crypto_v2(
        &self,
    ) -> Result<UserCryptoV2KeysResponse, StatefulCryptoError> {
        #[expect(deprecated)]
        make_v2_keys_for_v1_user(&self.client)
    }

    /// Creates a rotated set of account keys for the current state
    pub fn get_v2_rotated_account_keys(
        &self,
    ) -> Result<UserCryptoV2KeysResponse, StatefulCryptoError> {
        #[expect(deprecated)]
        get_v2_rotated_account_keys(&self.client)
    }

    /// Create the data necessary to update the user's kdf settings. The user's encryption key is
    /// re-encrypted for the password under the new kdf settings. This returns the re-encrypted
    /// user key and the new password hash but does not update sdk state.
    pub async fn make_update_kdf(
        &self,
        password: String,
        kdf: Kdf,
    ) -> Result<UpdateKdfResponse, CryptoClientError> {
        make_update_kdf(&self.client, &password, &kdf).await
    }

    /// Protects the current user key with the provided PIN. The result can be stored and later
    /// used to initialize another client instance by using the PIN and the PIN key with
    /// `initialize_user_crypto`.
    pub fn enroll_pin(&self, pin: String) -> Result<EnrollPinResponse, CryptoClientError> {
        enroll_pin(&self.client, pin)
    }

    /// Protects the current user key with the provided PIN. The result can be stored and later
    /// used to initialize another client instance by using the PIN and the PIN key with
    /// `initialize_user_crypto`. The provided pin is encrypted with the user key.
    pub fn enroll_pin_with_encrypted_pin(
        &self,
        // Note: This will be replaced by `EncString` with https://bitwarden.atlassian.net/browse/PM-24775
        encrypted_pin: String,
    ) -> Result<EnrollPinResponse, CryptoClientError> {
        let encrypted_pin: EncString = encrypted_pin.parse()?;
        let pin = encrypted_pin.decrypt(
            &mut self.client.internal.get_key_store().context_mut(),
            SymmetricKeySlotId::User,
        )?;
        enroll_pin(&self.client, pin)
    }

    /// Decrypts a `PasswordProtectedKeyEnvelope`, returning the user key, if successful.
    /// This is a stop-gap solution, until initialization of the SDK is used.
    #[cfg(any(feature = "wasm", test))]
    pub fn unseal_password_protected_key_envelope(
        &self,
        pin: String,
        envelope: PasswordProtectedKeyEnvelope,
    ) -> Result<Vec<u8>, CryptoClientError> {
        let mut ctx = self.client.internal.get_key_store().context_mut();
        let key_slot = envelope.unseal(
            pin.as_str(),
            PasswordProtectedKeyEnvelopeNamespace::PinUnlock,
            &mut ctx,
        )?;
        #[allow(deprecated)]
        let key = ctx.dangerous_get_symmetric_key(key_slot)?;
        Ok(key.to_encoded().to_vec())
    }

    /// A stop gap-solution for encrypting with the local user data key, until the WASM client's
    /// password generator history encryption and email forwarders encryption is fully migrated to
    /// SDK.
    pub fn encrypt_with_local_user_data_key(
        &self,
        plaintext: String,
    ) -> Result<String, CryptoClientError> {
        let mut ctx = self.client.internal.get_key_store().context_mut();
        plaintext
            .encrypt(&mut ctx, SymmetricKeySlotId::LocalUserData)
            .map_err(CryptoClientError::Crypto)
            .map(|enc| enc.to_string())
    }

    /// A stop gap-solution for decrypting with the local user data key, until the WASM client's
    /// password generator history encryption and email forwarders encryption is fully migrated to
    /// SDK.
    pub fn decrypt_with_local_user_data_key(
        &self,
        encrypted_plaintext: String,
    ) -> Result<String, CryptoClientError> {
        let mut ctx = self.client.internal.get_key_store().context_mut();
        let encrypted: EncString = encrypted_plaintext
            .parse()
            .map_err(CryptoClientError::Crypto)?;
        encrypted
            .decrypt(&mut ctx, SymmetricKeySlotId::LocalUserData)
            .map_err(CryptoClientError::Crypto)
    }

    /// ⚠️⚠️⚠️ HAZMAT WARNING: DO NOT USE THIS ⚠️⚠️⚠️
    ///
    /// Get the uses's decrypted encryption key. Note: It's very important
    /// to keep this key safe, as it can be used to decrypt all of the user's data. It is
    /// only permitted to use for a transition period where side effects such as biometrics
    /// and never-lock are set from within the client code.
    pub async fn get_user_encryption_key(&self) -> Result<B64, CryptoClientError> {
        get_user_encryption_key(&self.client).await
    }

    /// Takes a raw key and returns the corresponding key id. This is used for the biometrics
    /// subsystem and should be removed after moving over biometric management to the SDK.
    pub fn get_key_id_for_symmetric_key(
        key: Vec<u8>,
    ) -> Result<Option<Vec<u8>>, CryptoClientError> {
        let symmetric_key = SymmetricCryptoKey::try_from(&BitwardenLegacyKeyBytes::from(key))?;
        Ok(symmetric_key.key_id().map(|id| id.as_slice().to_vec()))
    }
}

impl CryptoClient {
    /// Create the data necessary to update the user's password. The user's encryption key is
    /// re-encrypted with the new password. This returns the new encrypted user key and the new
    /// password hash but does not update sdk state.
    pub async fn make_update_password(
        &self,
        new_password: String,
    ) -> Result<UpdatePasswordResponse, CryptoClientError> {
        make_update_password(&self.client, new_password).await
    }

    /// Generates a PIN protected user key from the provided PIN. The result can be stored and later
    /// used to initialize another client instance by using the PIN and the PIN key with
    /// `initialize_user_crypto`.
    pub async fn derive_pin_key(
        &self,
        pin: String,
    ) -> Result<DerivePinKeyResponse, CryptoClientError> {
        derive_pin_key(&self.client, pin).await
    }

    /// Derives the pin protected user key from encrypted pin. Used when pin requires master
    /// password on first unlock.
    pub async fn derive_pin_user_key(
        &self,
        encrypted_pin: EncString,
    ) -> Result<EncString, CryptoClientError> {
        derive_pin_user_key(&self.client, encrypted_pin).await
    }

    /// Creates a new rotateable key set for the current user key protected
    /// by a key derived from the given PRF.
    pub fn make_prf_user_key_set(&self, prf: B64) -> Result<RotateableKeySet, CryptoClientError> {
        make_prf_user_key_set(&self.client, prf)
    }

    /// Prepares the account for being enrolled in the admin password reset feature. This encrypts
    /// the users [UserKey][bitwarden_crypto::UserKey] with the organization's public key.
    pub fn enroll_admin_password_reset(
        &self,
        public_key: B64,
    ) -> Result<UnsignedSharedKey, EnrollAdminPasswordResetError> {
        enroll_admin_password_reset(&self.client, public_key)
    }

    /// Derive the master key for migrating to the key connector
    pub fn derive_key_connector(
        &self,
        request: DeriveKeyConnectorRequest,
    ) -> Result<B64, DeriveKeyConnectorError> {
        derive_key_connector(request)
    }

    /// Creates a new V2 account cryptographic state for TDE registration.
    /// This generates fresh cryptographic keys (private key, signing key, signed public key,
    /// and security state) wrapped with a new user key.
    pub fn make_user_tde_registration(
        &self,
        org_public_key: B64,
    ) -> Result<MakeTdeRegistrationResponse, MakeKeysError> {
        make_user_tde_registration(&self.client, org_public_key)
    }

    /// Creates a new V2 account cryptographic state for Key Connector registration.
    /// This generates fresh cryptographic keys (private key, signing key, signed public key,
    /// and security state) wrapped with a new user key.
    pub fn make_user_key_connector_registration(
        &self,
    ) -> Result<MakeKeyConnectorRegistrationResponse, MakeKeysError> {
        make_user_key_connector_registration(&self.client)
    }

    /// Creates a new V2 account cryptographic state for SSO JIT master password registration.
    /// This generates fresh cryptographic keys (private key, signing key, signed public key,
    /// and security state) wrapped with a new user key.
    pub fn make_user_jit_master_password_registration(
        &self,
        master_password: String,
        salt: String,
        org_public_key: B64,
    ) -> Result<MakeJitMasterPasswordRegistrationResponse, MakeKeysError> {
        make_user_jit_master_password_registration(
            &self.client,
            master_password,
            salt,
            org_public_key,
        )
    }

    /// Creates new V2 account cryptographic state for password-based registration
    /// This generates fresh cryptographic keys (private key, signing key, signed public key,
    /// security state) wrapped with a new user key.
    pub fn make_user_password_registration(
        &self,
        master_password: String,
        salt: String,
    ) -> Result<MakeUserMasterPasswordRegistrationResponse, MakeKeysError> {
        make_user_password_registration(&self.client, master_password, salt)
    }

    /// Gets the upgraded V2 user key using an upgrade token.
    /// If the current key is already V2, returns it directly.
    /// If the current key is V1 and a token is provided, extracts the V2 key.
    pub fn get_upgraded_user_key(
        &self,
        upgrade_token: Option<V2UpgradeToken>,
    ) -> Result<B64, CryptoClientError> {
        let mut ctx = self.client.internal.get_key_store().context_mut();

        let algorithm = ctx
            .get_symmetric_key_algorithm(SymmetricKeySlotId::User)
            .map_err(|_| CryptoClientError::NotAuthenticated(NotAuthenticatedError))?;

        match (algorithm, upgrade_token) {
            // Already V2, return current key
            (SymmetricKeyAlgorithm::XChaCha20Poly1305, _) => {
                #[allow(deprecated)]
                let current_key = ctx
                    .dangerous_get_symmetric_key(SymmetricKeySlotId::User)
                    .map_err(|_| CryptoClientError::NotAuthenticated(NotAuthenticatedError))?;
                Ok(current_key.clone().to_base64())
            }
            // V1 with token, extract V2
            (SymmetricKeyAlgorithm::Aes256CbcHmac, Some(token)) => {
                let v2_key_id = token
                    .unwrap_v2(SymmetricKeySlotId::User, &mut ctx)
                    .map_err(|_| CryptoClientError::InvalidUpgradeToken)?;
                #[allow(deprecated)]
                let v2_key = ctx
                    .dangerous_get_symmetric_key(v2_key_id)
                    .map_err(|_| CryptoClientError::InvalidUpgradeToken)?;
                Ok(v2_key.clone().to_base64())
            }
            // V1 without token, error
            (SymmetricKeyAlgorithm::Aes256CbcHmac, None) => {
                Err(CryptoClientError::UpgradeTokenRequired)
            }
            (SymmetricKeyAlgorithm::Aes256Gcm, _) => Err(CryptoClientError::InvalidKeyType),
        }
    }
}

#[cfg(feature = "uniffi")]
impl CryptoClient {
    /// Re-initialize the user's cryptographic state during an unlock session.
    ///
    /// Requires the SDK to be unlocked. Replaces the in-memory account
    /// cryptographic state with the provided one, and upgrades the active user key from V1 to V2.
    pub async fn reinit_user_crypto(
        &self,
        req: ReinitUserCryptoRequest,
    ) -> Result<(), ReinitUserCryptoError> {
        reinit_user_crypto(&self.client, req).await
    }
}

impl Client {
    /// Access to crypto functionality.
    pub fn crypto(&self) -> CryptoClient {
        CryptoClient {
            client: self.clone(),
        }
    }
}

#[cfg(test)]
mod tests {
    use bitwarden_crypto::{BitwardenLegacyKeyBytes, KeyStore, SymmetricCryptoKey};

    use super::*;
    use crate::{
        client::test_accounts::{test_bitwarden_com_account, test_bitwarden_com_account_v2},
        key_management::{KeySlotIds, V2UpgradeToken},
    };

    #[tokio::test]
    async fn test_enroll_pin_envelope() {
        // Initialize a test client with user crypto
        let client = Client::init_test_account(test_bitwarden_com_account()).await;
        let user_key_initial =
            SymmetricCryptoKey::try_from(client.crypto().get_user_encryption_key().await.unwrap())
                .unwrap();

        // Enroll with a PIN, then re-enroll
        let pin = "1234";
        let enroll_response = client.crypto().enroll_pin(pin.to_string()).unwrap();
        let re_enroll_response = client
            .crypto()
            .enroll_pin_with_encrypted_pin(enroll_response.user_key_encrypted_pin.to_string())
            .unwrap();

        let secret = BitwardenLegacyKeyBytes::from(
            client
                .crypto()
                .unseal_password_protected_key_envelope(
                    pin.to_string(),
                    re_enroll_response.pin_protected_user_key_envelope,
                )
                .unwrap(),
        );
        let user_key_final = SymmetricCryptoKey::try_from(&secret).expect("valid user key");
        assert_eq!(user_key_initial, user_key_final);
    }

    #[test]
    fn test_get_upgraded_user_key_not_authenticated() {
        let client = Client::new(None);
        let result = client.crypto().get_upgraded_user_key(None);
        assert!(matches!(
            result,
            Err(CryptoClientError::NotAuthenticated(_))
        ));
    }

    #[tokio::test]
    async fn test_get_upgraded_user_key_v1_no_token_returns_error() {
        let client = Client::init_test_account(test_bitwarden_com_account()).await;
        let result = client.crypto().get_upgraded_user_key(None);
        assert!(matches!(
            result,
            Err(CryptoClientError::UpgradeTokenRequired)
        ));
    }

    #[tokio::test]
    async fn test_get_upgraded_user_key_v1_with_token_returns_v2_key() {
        let client = Client::init_test_account(test_bitwarden_com_account()).await;

        // Add a fresh V2 key to the client's keystore and build a token linking it to the V1 key
        let (token, expected_v2_b64) = {
            let mut ctx = client.internal.get_key_store().context_mut();
            let v2_key_id = ctx.make_symmetric_key(SymmetricKeyAlgorithm::XChaCha20Poly1305);
            #[allow(deprecated)]
            let v2_key = ctx.dangerous_get_symmetric_key(v2_key_id).unwrap().clone();
            let token = V2UpgradeToken::create(SymmetricKeySlotId::User, v2_key_id, &ctx).unwrap();
            (token, v2_key.to_base64())
        };

        let result = client.crypto().get_upgraded_user_key(Some(token)).unwrap();
        assert_eq!(result, expected_v2_b64);
    }

    #[tokio::test]
    async fn test_get_upgraded_user_key_v1_invalid_token_returns_error() {
        let client = Client::init_test_account(test_bitwarden_com_account()).await;

        // Token built with a different V1 key — unwrapping with the client's V1 key will fail
        let mismatched_token = {
            let key_store = KeyStore::<KeySlotIds>::default();
            let mut ctx = key_store.context_mut();
            let wrong_v1_id = ctx.make_symmetric_key(SymmetricKeyAlgorithm::Aes256CbcHmac);
            let v2_id = ctx.make_symmetric_key(SymmetricKeyAlgorithm::XChaCha20Poly1305);
            V2UpgradeToken::create(wrong_v1_id, v2_id, &ctx).unwrap()
        };

        let result = client
            .crypto()
            .get_upgraded_user_key(Some(mismatched_token));
        assert!(matches!(
            result,
            Err(CryptoClientError::InvalidUpgradeToken)
        ));
    }

    #[tokio::test]
    async fn test_get_upgraded_user_key_already_v2_no_token_returns_v2_key() {
        let client = Client::init_test_account(test_bitwarden_com_account_v2()).await;

        let result = client.crypto().get_upgraded_user_key(None).unwrap();
        let result_key = SymmetricCryptoKey::try_from(result).unwrap();
        assert!(
            matches!(result_key, SymmetricCryptoKey::XChaCha20Poly1305Key(_)),
            "V2 user should receive a V2 key"
        );
    }

    #[tokio::test]
    async fn test_get_upgraded_user_key_already_v2_with_token_ignored() {
        let client = Client::init_test_account(test_bitwarden_com_account_v2()).await;

        // Build a structurally valid token with unrelated keys; it must be ignored for V2 users.
        let dummy_token = {
            let key_store = KeyStore::<KeySlotIds>::default();
            let mut ctx = key_store.context_mut();
            let v1_id = ctx.make_symmetric_key(SymmetricKeyAlgorithm::Aes256CbcHmac);
            let v2_id = ctx.make_symmetric_key(SymmetricKeyAlgorithm::XChaCha20Poly1305);
            V2UpgradeToken::create(v1_id, v2_id, &ctx).unwrap()
        };

        let result_with_token = client
            .crypto()
            .get_upgraded_user_key(Some(dummy_token))
            .unwrap();
        let result_no_token = client.crypto().get_upgraded_user_key(None).unwrap();
        assert_eq!(
            result_with_token, result_no_token,
            "Token must be ignored for a V2 user"
        );
    }
}