Encryption Mechanism:

The payload of the supported APIs are encrypted with the following method. We use AES-512 & RSA for encryption of payload.

Summary of Steps:

1. Download the Public Key (public_key.pem) file from “Edit Flow” section.

2. Take the valid JSON payload of the API which needs to be passed. Let’s call it “payload”

3. Encode the payload using Base64 encoding. Let’s call the result “payload-B64”.

4. Generate a random string of upto 2048 characters to be used as the signature key

5. Encode that with Base64 encoding. Let’s call it “signatureKey-B64”

6. Use AES-512/ECB/PKCS5Padding encryption method to encrypt “payload-B64” with “signatureKey-B64”. Let’s call the result “payload-B64-AES”.

7. Encrypt the encoded signature key with RSA Encryption using the Public Key obtained on step 1. Let’s call it “signatureKey-B64-RSA”.

8. Send both “payload-B64-AES” and “signatureKey-B64-RSA” as parameters to the encrypted API.

Sample Example:

1. Original Sample Request Data :

{
	"api-version": "1.0",
	"security-id": "f534794a88b87200f1fd7c6af0c09ffcf9a4abf465c09a957c22c22b00ce2221",
	"flow-id": "BTFpAuqF",
	"calls": [
		{
			"client-identifier": "{% now 'iso-8601', '' %}",
			"start-time": "{% now 'iso-8601', '' %}",
			"contact-numbers": [
				"6262772728"
			],
			"keys": [
				{
					"name": "$flow.key.customername",
					"value": "Parin"
				},
				{
					"name": "$flow.key.product",
					"value": "Health"
				}
			]
		}
	]
}

2. Base64 Encoded String :

Online site to convert normal text to base64: https://www.base64encode.org/

IHsKICAidmlzaXRvciI6ICI5MTk4Nzk1ODU3MDAiLAogICJjdXN0VG9rZW4iOiAidTFkOXowM2IiLAogICJkdXJhdGlvbiI6ICI5MDAiLAogICJzY2hlZHVsZWRfY2FsbGJhY2tfdGltZSI6ICIyMDIxLTAzLTI3IDEyOjAwOjAwIiwKICAidWRmNSI6ICJST1NTRSIsCiAgInVkZjciOiAiU0NIRU1FTkFNRVNXSVRDSCBJTiIsCiAgInVkZjExIjogInBhZ2U7Uk9TU0lEO0lOVkVTVE9STkFNRTtTQ0hFTUVOQU1FO0FNT1VOVDtVTklUUztFWElUTE9BREFNVDtPdGhlcmRldGFpbHM7Rm9saW8gY291bnQ7RGV0YWlscztSZWRlbXB0aW9uZm9saW9jb3VudDtTd2l0Y2hmb2xpb2NvdW50IiwKICAidWRmMTIiOiAiUmVhc29uO0ZPTElPTk87Q1JFQVRFRE9OIiwKfQ==

3. Generate a random string for encryption as symmetric and encode it with Base64 Encoding

Random Key : test1234
Base64 Encoded:: dGVzdDEyMzQ=

4. Symmetric Key encryption of data from Point 2 & 3 – Algorithm : AES/ECB/PKCS5Padding

AES Encryption Data :

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

Sample Link For AES Encryption: https://howtodoinjava.com/java/java-security/java-aes-encryption-example/

Note: Please use MessageDigest.getInstance("SHA-256");

5. RSA Encryption For Base64 encoded random Key :

VZATnCid3xMId80c4NVx365ubTYEEOE7y/3/sEjgKpWHyVsZmtuTuLC8ohdgunFmT8SsAYZtGydhKH9LJG6PwmYBCb+DNxdXnZ3Vrg+V+m/uA0tFp1CarEr5J5fMqN5fO9Qyb82JKk5ZamVmv0NRlMXxBi7S1hT0b85ZrpKaIX2OP6rYnDVeXDwIObj1XzvUna+sidbkHNeFJ+/m7xJONOof8Mv2FtAh65JWW/mdUzRbFCv/lBNHO7P6j6E1wNAE8UUgR7WrPusYlaw0S76yGo5p2r+mlG5/hZZMVU3ZUJvm4rP++tiZFuz1mpGjm4g2eUv6ugJ7fPyKSiFySNgX7g==

Sample Link For RAS Encryption: https://www.javainterviewpoint.com/rsa-encryption-and-decryption/

Note: Use public-key shared by phonon to encrypt key data.

6. Final Encrypted JSON Request -

In the end the whole JSON Request will look like this :

{
"RequestEncryptedValue":"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",
"RequestDigitalSignatureValue":"VZATnCid3xMId80c4NVx365ubTYEEOE7y/3/sEjgKpWHyVsZmtuTuLC8ohdgunFmT8SsAYZtGydhKH9LJG6PwmYBCb+DNxdXnZ3Vrg+V+m/uA0tFp1CarEr5J5fMqN5fO9Qyb82JKk5ZamVmv0NRlMXxBi7S1hT0b85ZrpKaIX2OP6rYnDVeXDwIObj1XzvUna+sidbkHNeFJ+/m7xJONOof8Mv2FtAh65JWW/mdUzRbFCv/lBNHO7P6j6E1wNAE8UUgR7WrPusYlaw0S76yGo5p2r+mlG5/hZZMVU3ZUJvm4rP++tiZFuz1mpGjm4g2eUv6ugJ7fPyKSiFySNgX7g==",

"flow-id": "ZH0RKJvh"
}

7. Response

You’ll be getting the general response that you get from either API.

{
  "api-response-code": 200,
  "api-response-message": "Success",
  "request-id": "367a25ec-065b-4ca7-a73f-70d1da818a22",
  "call-details": [
    {
      "client-identifier": "2021-05-17T05:47:30.536Z",
      "phonon-uuid": "6a79da04-cf07-4c42-973f-998ea3380708"
    }
  ]
}