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docs/developers/provider/encryption-decryption.md

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# Encryption / Decryption
### Encrypt endpoint
* **Endpoint**: `POST /api/services/encrypt`
* **Parameters**: The body of the request should contain a binary application/octet-stream.
* **Purpose**: This endpoint is used to encrypt a document. It accepts binary data and returns an encrypted bytes string.
* **Responses**:
* **200**: This is a successful HTTP response code. It returns a bytes string containing the encrypted document. For example: `b'0x04b2bfab1f4e...7ed0573'`
Example response:
```
b'0x04b2bfab1f4e...7ed0573'
```
#### Javascript Example
```runkit nodeVersion="18.x.x"
const fetch = require('cross-fetch')
const data = "test"
const response = await fetch('https://v4.provider.oceanprotocol.com/api/services/encrypt?chainId=1', {
method: 'POST',
body: JSON.stringify(data),
headers: { 'Content-Type': 'application/octet-stream' }
})
console.log(response)
```
#### GET /api/services/initialize
Parameters
```
documentId: String object containing document id (e.g. a DID)
serviceId: String, ID of the service the datatoken is attached to
consumerAddress: String object containing consumer's address
environment: String representing a compute environment offered by the provider
validUntil: Integer, date of validity of the service (optional)
fileIndex: Integer, the index of the file from the files list in the dataset. If set, provider will validate the file access. (optional)
```
Returns: Json document with a quote for amount of tokens to transfer to the provider account.
Example:
```
GET /api/services/initialize
payload:
{
"documentId":"0x1111",
"serviceId": 0,
"consumerAddress":"0x990922334",
}
payload (with optional parameters):
{
"documentId":"0x1111",
"serviceId": 0,
"consumerAddress":"0x990922334",
"validUntil": 1578004800,
"fileIndex": 1
}
```
Response:
```json
{
"datatoken": "0x21fa3ea32892091...",
"nonce": 23,
"providerFee": {
"providerFeeAddress": "0xabc123...",
"providerFeeToken": "0xabc123...",
"providerFeeAmount": "200",
"providerData": "0xabc123...",
"v": 27,
"r": "0xabc123...",
"s": "0xabc123...",
"validUntil": 123456,
},
"computeAddress": "0x8123jdf8sdsa..."
}
```
### Decrypt endpoint
* **Endpoint**: `POST /api/services/decrypt`
* **Parameters**: The body of the request should contain a JSON object with the following properties:
* `decrypterAddress`: A string containing the address of the decrypter (required).
* `chainId`: The chain ID of the network the document is on (required).
* `transactionId`: The transaction ID of the encrypted document (optional).
* `dataNftAddress`: The address of the data non-fungible token (optional).
* `encryptedDocument`: The encrypted document (optional).
* `flags`: The flags of the encrypted document (optional).
* `documentHash`: The hash of the encrypted document (optional).
* `nonce`: The nonce of the encrypted document (required).
* `signature`: The signature of the encrypted document (required).
* **Purpose**: This endpoint is used to decrypt a document. It accepts the decrypter address, chain ID, and other optional parameters, and returns the decrypted document.
* **Responses**:
* **200**: This is a successful HTTP response code. It returns a bytes string containing the decrypted document.
Example response:
```
b'{"@context": ["https://w3id.org/did/v1"], "id": "did:op:0c184915b07b44c888d468be85a9b28253e80070e5294b1aaed81c ...'
```