DbEnv::set_encrypt()
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## DbEnv::set_encrypt()

    #include <db_cxx.h>

    int
    DbEnv::set_encrypt(const char *passwd, u_int32_t flags);

Set the password used by the Berkeley DB library to perform encryption and decryption.

The `DbEnv::set_encrypt()` method configures a database environment, not only operations performed using the specified DbEnv handle.

The `DbEnv::set_encrypt()` method may not be called after the DbEnv::open() method is called. If the database environment already exists when DbEnv::open() is called, the information specified to `DbEnv::set_encrypt()` must be consistent with the existing environment or an error will be returned.

The `DbEnv::set_encrypt()` method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

### Parameters

#### flags

The flags parameter must be set to 0 or the following value:

- `DB_ENCRYPT_AES`

  Use the Rijndael/AES (also known as the Advanced Encryption Standard and Federal Information Processing Standard (FIPS) 197) algorithm for encryption or decryption.

#### passwd

The passwd parameter is the password used to perform encryption and decryption.

### Errors

The `DbEnv::set_encrypt()` method may fail and throw a DbException exception, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

#### EINVAL

If the method was called after DbEnv::open() was called; or if an invalid flag value or parameter was specified.

#### EOPNOTSUPP

Cryptography is not available in this Berkeley DB release.

### Class

DbEnv

### See Also

Database Environments and Related Methods

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