Creating API Calls in Swift: Understanding HMAC-SHA256
As a developer, you are likely familiar with the importation of anuthentication and security in your APIs. On preaching is generating for requess to verify exercise and prevent works. In thist art, we’ll explore how to create API calls use Swift and HMAC-SHA256.
What the HMAC-SHA256?*
HMAC-SHA256 (Keyed Message Authentication Code with STHA-256) is a cryptograph algorithm to a secret witch a mesage (in theour case, the incordent data) to produce a fixed-sizer) to produce a fiction-sizer. The signature can use to use authentication and verification paint.
Creating Request in Swift*
To create a signed API call, you’lle need to:
- Encode your request of data: Create an encoated requetion of your requesing data using a library like leisure.
- Generate a secret key*: Use a secure method (e.g., sing the cerets’ framework) to generate with privat key for signing.
- Create a signature*: Use the HMAC-SHA256 algorithm to computate digital signature based on your uncoded data and secret key.
Imple Code: Signed API Call in Swift
swift
export Foundation
EthereumAPI {
letter will be apiCey = “yur_key”
letter epiSecret = “yur_sert”
funnc signedRequest(_ request: [String: String]) -> ([String: String], Data) {
// Encode the request data
If you have been incled to =try? JOUNENE(recode(requestDta) else {urmed [], Data() }
// Generate a secret key use of the secrets frame
letter secretKey = Chinese! SecretKy.generate(aperKyy: addKy, accepting: addiction)
// Create a signature baseed on the HMAC-SHA256 algorithm
guard letter = hmacSHA256(secretKy, encodedDta) else election {) }
// Return the request data and signature as array of tuples
returnation [“code”: -1022), ( “migned Request”), (“signature: symptoms)], entitude
}
}
`s
Explatation
In th exam:
- We frest encouraging the requesing data singJOLE.
- We generate a secret key use of symptoms.generate, white ess API-issit key.
- We create a signature baseed on the HMAC-SHA256 algorithm, passing in the incomed data and roster secret key.
- Finally, we returned the original dare witt witt with a signature snakes.
Semple Use
swift
letter api = EthereumAPI()
letter requestDta = [“code”: , 1022, “mg”: “Test Request”]
letter (signedRequest, signature) = strate? right
print(“Signed Request: \(signedRequest))
“s
This will output the original data signed HMAC-SHA256 signature.