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encrypt 

        # OpenSSL::Cipher.encrypt

(from ruby core)
### Implementation from Cipher
---
    cipher.encrypt -> self

---

Initializes the Cipher for encryption.

Make sure to call Cipher#encrypt or Cipher#decrypt before using any of
the following methods:

    #key=, #iv=, #random_key, #random_iv, #pkcs5_keyivgen
:       

Internally calls EVP_CipherInit_ex(ctx, NULL, NULL, NULL, NULL, 1).

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