Db::set_encrypt()
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## Db::set_encrypt()

    #include <db_cxx.h>

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

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

Because databases opened within Berkeley DB environments use the password specified to the environment, it is an error to attempt to set a password in a database created within an environment.

The `Db::set_encrypt()` method may not be called after the Db::open() method is called.

The `Db::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 `Db::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 Db::open() was called; or if an invalid flag value or parameter was specified.

#### EOPNOTSUPP

Cryptography is not available in this Berkeley DB release.

### Class

Db

### See Also

Database and Related Methods

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