@govtechsg/oa-encryption
v1.3.5
Published
Shared library for managing oa encrypted file transfers
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2,686
Readme
Open Attestation (Encryption)
The Open Attestation (Encryption) repository is the codebase for the npm module that allows you to encrypt documents in order to share and store them safely.
This module does not provide the following functionality:
- Programmatic wrapping of OA documents (refer to Open Attestation)
- Programmatic verification of OA documents (refer to Open Attestation (Verify))
- Programmatic issuance/revocation of document on the Ethereum blockchain
This library is used for encrypting OpenAttestation files in transit
Installation
npm i @govtechsg/oa-encryption
Usage
Encrypting a document
const { encryptString } = require("@govtechsg/oa-encryption");
const document = {
version: "https://schema.openattestation.com/2.0/schema.json",
data: {
issuers: [
{
documentStore: "5924d910-8916-446a-b1c3-55e2f86dd8f3:string:0xabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd",
name: "0f737b20-9e5e-4ec4-bffd-c63002616bfd:string:University of Blockchain",
identityProof: {
type: "5fc379dd-cd24-4c91-a4c7-cf76f9c96d8d:string:DNS-TXT",
location: "62e1c6c3-09a9-4e52-aaf6-9daf24d43657:string:example.com",
},
},
],
},
privacy: { obfuscatedData: [] },
signature: {
type: "SHA3MerkleProof",
targetHash: "956e27c86d4893a971600d328e235ede886f1c00b183257a822667b69886fced",
proof: [],
merkleRoot: "956e27c86d4893a971600d328e235ede886f1c00b183257a822667b69886fced",
},
};
const encryptedDocument = encryptString(JSON.stringify(document));
console.log(encryptedDocument);
Will display something like (when you will run it, the values will be different) :
{
cipherText:
'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',
iv: 'TG47WMwppeS9oICk',
tag: 'Iox0laR51y8czUw8Yx6mGQ==',
key:
'04d49fe8ac0a0afa5e9e2fa617551b5d7be532d0c8586a0809d7d223316d7cc5',
type: 'OPEN-ATTESTATION-TYPE-1'
}
The key from the encrypted document can be extracted out and the rest of the document can be stored anywhere. To decrypt the document, the key will be needed, hence the content of your document is safe.
Decrypting a document
const { decryptString } = require("@govtechsg/oa-encryption");
const encryptedDocument = {
cipherText:
"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",
iv: "WK7OMSRG5ODxonBO",
tag: "pXV7QvmTRA00OkL510pSvw==",
key: "46b1f4f0b53e5a5b92dd8e7c9a53826a41a03d9333a501ebeb1710fcd2741420",
type: "OPEN-ATTESTATION-TYPE-1",
};
const decryptedDocument = decryptString(encryptedDocument);
console.log(JSON.parse(decryptedDocument));
The content of your document is retrieved.
Dont forget to put back the key in the object passed to
decryptString
function, when you separate the key from the encrypted document.
- Found a bug? Have a question? Want to share an idea? Reach us on the Github repository.
API
Table of Contents
- ENCRYPTION_PARAMETERS
- generateEncryptionKey
- encodeDocument
- decodeDocument
- IEncryptionResults
- encryptString
- decryptString
ENCRYPTION_PARAMETERS
Default options from responses here https://crypto.stackexchange.com/questions/26783/ciphertext-and-tag-size-and-iv-transmission-with-aes-in-gcm-mode/26787
algorithm
keyLength
ivLength
tagLength
version
generateEncryptionKey
Generates a random key represented as a hexadecimal string
Parameters
keyLengthInBits
number Key length (optional, defaultENCRYPTION_PARAMETERS.keyLength
)
encodeDocument
Parameters
document
string
decodeDocument
Parameters
encoded
string
IEncryptionResults
encryptString
Encrypts a given string with symmetric AES
Parameters
Returns IEncryptionResults cipherText cipher text in base64
Returns any iv iv in base64
Returns any tag authenticated encryption tag in base64
Returns any key encryption key in hexadecimal
Returns any type The encryption algorithm identifier
decryptString
Decrypts a given ciphertext along with its associated variables
Parameters
$0.cipherText
$0.tag
$0.iv
$0.key
$0.type
cipherText
string cipher text base64 encodedtag
string aes authentication tag base64 encodediv
string iv base64 encodedkey
string decryption key hexademical encodedtype
string encryption algorithm identifier
Returns string