Rust Requires Chilkat v11.0.0+

Ibanity HTTP Signature for XS2A, Isabel Connect, Ponto Connect

See more Ibanity Examples

Demonstrates how to add a Signature header for Ibanity HTTP requests. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// In order to sign your HTTP requests, you have to add 2 headers to the HTTP request: Digest: the digest of the request payload and Signature: the actual signature of the request. 

// POST /xs2a/customer-access-tokens HTTP/1.1
// Host: api.ibanity.com
// Content-Type: application/json
// Digest: SHA-512=z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
// Ibanity-Idempotency-Key: 61f02718-eeee-46e1-b5eb-e8fd6e799c2d
// Signature: keyId="62f02718-eeee-46e1-b5eb-e8fd6e799c2e",created=1599659223,algorithm="hs2019",headers="(request-target) host digest (created) ibanity-idempotency-key",signature="SjWJWbWN7i0...zsbM="
// 
// {"data":{"type":"customerAccessToken", "attributes":{"applicationCustomerReference":"15874569"}}}

// The payload (body) of the above HTTP request is the JSON.
// Build the JSON above.
// Use this online tool to generate code from sample JSON: 
// Generate Code to Create JSON
let json = chilkat::JsonObject::new();
let _ = json.update_string("data.type", "customerAccessToken");
let _ = json.update_string("data.attributes.applicationCustomerReference", "15874569");

let payload = json.emit().unwrap_or_default();
println!("payload = {}", payload);

// Step 1: Build the (created) virtual header

let dt_now = chilkat::DateTime::new();
let _ = dt_now.set_from_current_system_time();
let created = dt_now.get_as_unix_time_str(false).unwrap_or_default();
println!("created = {}", created);

// Step 2: Build the Digest header
let crypt = chilkat::Crypt2::new();
crypt.set_hash_algorithm("sha512");
crypt.set_encoding_mode("base64");
crypt.set_charset("utf-8");

let sb_digest_hdr_value = chilkat::StringBuilder::new();
let _ = sb_digest_hdr_value.append("SHA-512=");
let _ = sb_digest_hdr_value.append(&crypt.hash_string_enc(&json.emit().unwrap_or_default()).unwrap_or_default());

println!("{}", sb_digest_hdr_value.get_as_string().unwrap_or_default());

// Step 3: Build the (request target) virtual header

// In order to build the signature you will need a virtual header named (request-target) (the parentheses are important). 
// The (request-target) is the string concatenation of the HTTP method (in lowercase) with the path and query parameters.
let request_target = "post /xs2a/customer-access-tokens".to_string();

// Step 4: Build the signing string

// The signing string is the concatenation of the signed header names (in lowercase) and values separated by a LF.

// You must always sign the following headers: (request-target), host, (created), digest. 
// If used, you must also sign the authorization header and any ibanity-* headers, such as ibanity-idempotency-key. 

let sb_signing_string = chilkat::StringBuilder::new();
let _ = sb_signing_string.append("(request-target): ");
let _ = sb_signing_string.append_line(&request_target, false);
let _ = sb_signing_string.append("host: ");
let _ = sb_signing_string.append_line("api.ibanity.com", false);
let _ = sb_signing_string.append("digest: ");
let _ = sb_signing_string.append_line(&sb_digest_hdr_value.get_as_string().unwrap_or_default(), false);
let _ = sb_signing_string.append("(created): ");
let _ = sb_signing_string.append_line(&created, false);
let _ = sb_signing_string.append("ibanity-idempotency-key: ");
let idempotency_key = crypt.generate_uuid().unwrap_or_default();
let _ = sb_signing_string.append(&idempotency_key);

// Step 5: Build the signed headers list

// To allow Ibanity to check the signed headers, you must provide a list of the header names. They should be lowercase and in the same order used to create the signing string. 
let signed_headers_list = "(request-target) host digest (created) ibanity-idempotency-key".to_string();

// Step 6: Build the Signature header

// This is where the real signing happens. The signature header is a combination of several sub-headers -
// 
//     keyId: the identifier for the application's signature certificate, obtained from the Developer Portal
//     algorithm: the digital signature algorithm used to generate the signature (must be hs2019)
//     headers: The list of HTTP headers created in step 5
//     signature: the Base64-encoded digital signature of the signing string created in step 4.

let priv_key = chilkat::PrivateKey::new();
if priv_key.load_encrypted_pem_file("my_ibanity_signature_private_key.pem", "pem_password").is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

let rsa = chilkat::Rsa::new();
rsa.set_pss_salt_len(32);
rsa.set_encoding_mode("base64");
// Use the RSASSA-PSS signature algorithm
rsa.set_pkcs_padding(false);

if rsa.use_private_key(&priv_key).is_err() {
    println!("{}", rsa.last_error_text());
    return;
}

// Sign the signing string.
let Ok(sig_base64) = rsa.sign_string_enc(&sb_signing_string.get_as_string().unwrap_or_default(), "sha-256") else {
    println!("{}", rsa.last_error_text());
    return;
};

// Build the signature header value.
let sb_sig_header_value = chilkat::StringBuilder::new();
let _ = sb_sig_header_value.append("keyId=\"");
// Use your identifier for the application's signature certificate, obtained from the Developer Portal
let _ = sb_sig_header_value.append("62f02718-eeee-46e1-b5eb-e8fd6e799c2e");
let _ = sb_sig_header_value.append("\",created=");
let _ = sb_sig_header_value.append(&created);
let _ = sb_sig_header_value.append(",algorithm=\"hs2019\",headers=\"");
let _ = sb_sig_header_value.append(&signed_headers_list);
let _ = sb_sig_header_value.append("\",signature=\"");
let _ = sb_sig_header_value.append(&sig_base64);
let _ = sb_sig_header_value.append("\"");

println!("{}", sb_sig_header_value.get_as_string().unwrap_or_default());