You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: path_encrypt.go
    path of file: ./repos/goldfish/vendor/github.com/hashicorp/vault/builtin/logical/transit
    
    the code of the file until where you have to start completion: package transit

import (
	"encoding/base64"
	"fmt"
	"sync"

	"github.com/hashicorp/vault/helper/errutil"
	"github.com/hashicorp/vault/helper/keysutil"
	"github.com/hashicorp/vault/logical"
	"github.com/hashicorp/vault/logical/framework"
	"github.com/mitchellh/mapstructure"
)

// BatchRequestItem represents a request item for batch processing
type BatchRequestItem struct {
	// Context for key derivation. This is required for derived keys.
	Context string `json:"context" structs:"context" mapstructure:"context"`

	// DecodedContext is the base64 decoded version of Context
	DecodedContext []byte

	// Plaintext for encryption
	Plaintext string `json:"plaintext" structs:"plaintext" mapstructure:"plaintext"`

	// Ciphertext for decryption
	Ciphertext string `json:"ciphertext" structs:"ciphertext" mapstructure:"ciphertext"`

	// Nonce to be used when v1 convergent encryption is used
	Nonce string `json:"nonce" structs:"nonce" mapstructure:"nonce"`

	// The key version to be used for encryption
	KeyVersion int `json:"key_version" structs:"key_version" mapstructure:"key_version"`

	// DecodedNonce is the base64 decoded version of Nonce
	DecodedNonce []byte
}

// BatchResponseItem represents a response item for batch processing
type BatchResponseItem struct {
	// Ciphertext for the plaintext present in the corresponding batch
	// request item
	Ciphertext string `json:"ciphertext,omitempty" structs:"ciphertext" mapstructure:"ciph
    
func (b *backend) pathEncrypt() *framework.Path {
	return &framework.Path{
		Pattern: "encrypt/" + framework.GenericNameRegex("name"),
		Fields: map[string]*framework.FieldSchema{
			"name": &framework.FieldSchema{
				Type:        framework.TypeString,
				Description: "Name of the policy",
			},

			"plaintext": &framework.FieldSchema{
				Type:        framework.TypeString,
				Description: "Base64 encoded plaintext value to be encrypted",
			},

			"context": &framework.FieldSchema{
				Type:        framework.TypeString,
				Description: "Base64 encoded context for key derivation. Required if key derivation is enabled",
			},

			"nonce": &framework.FieldSchema{
				Type: framework.TypeString,
				Description: `
Base64 encoded nonce value. Must be provided if convergent encryption is
enabled for this key and the key was generated with Vault 0.6.1. Not required
for keys created in 0.6.2+. The value must be exactly 96 bits (12 bytes) long
and the user must ensure that for any given context (and thus, any given
encryption key) this nonce value is **never reused**.
`,
			},

			"type": &framework.FieldSchema{
				Type:    framework.TypeString,
				Default: "aes256-gcm96",
				Description: `
This parameter is required when encryption key is expected to be created.
When performing an upsert operation, the type of key to create. Currently,
"aes256-gcm96" (symmetric) is the only type supported. Defaults to
"aes256-gcm96".`,
			},

			"convergent_encryption": &framework.FieldSchema{
				Type: framework.TypeBool,
				Description: `
This parameter will only be used when a key is expected to be created.  Whether
to support convergent encryption. This is only supported when using a key with
key derivation enabled and will require all requests to carry both a context
and 96-bit (12-byte) nonce. The given nonce will be used in place of a randomly
generated nonce. As a result, when the same context and nonce are supplied, the
same ciphertext is generated. It is *very important* when using this mode that
you ensure that all nonces are unique for a given context.  Failing to do so
will severely impact the ciphertext's security.`,
			},

			"key_version": &framework.FieldSchema{
				Type: framework.TypeInt,
				Description: `The version of the key to use for encryption.
Must be 0 (for latest) or a value greater than or equal
to the min_encryption_version configured on the key.`,
			},
		},

		Callbacks: map[logical.Operation]framework.OperationFunc{
			logical.CreateOperation: b.pathEncryptWrite,
			logical.UpdateOperation: b.pathEncryptWrite,
		},

		ExistenceCheck: b.pathEncryptExistenceCheck,

		HelpSynopsis:    pathEncryptHelpSyn,
		HelpDescription: pathEncryptHelpDesc,
	}
}