Perl

Ibanity HTTP Signature for XS2A, Isabel Connect, Ponto Connect

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

use chilkat();

$success = 0;

# 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
$json = chilkat::CkJsonObject->new();
$json->UpdateString("data.type","customerAccessToken");
$json->UpdateString("data.attributes.applicationCustomerReference","15874569");

$payload = $json->emit();
print "payload = " . $payload . "\r\n";

# Step 1: Build the (created) virtual header

$dtNow = chilkat::CkDateTime->new();
$dtNow->SetFromCurrentSystemTime();
$created = $dtNow->getAsUnixTimeStr(0);
print "created = " . $created . "\r\n";

# Step 2: Build the Digest header
$crypt = chilkat::CkCrypt2->new();
$crypt->put_HashAlgorithm("sha512");
$crypt->put_EncodingMode("base64");
$crypt->put_Charset("utf-8");

$sbDigestHdrValue = chilkat::CkStringBuilder->new();
$sbDigestHdrValue->Append("SHA-512=");
$sbDigestHdrValue->Append($crypt->hashStringENC($json->emit()));

print $sbDigestHdrValue->getAsString() . "\r\n";

# 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.
$request_target = "post /xs2a/customer-access-tokens";

# 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. 

$sbSigningString = chilkat::CkStringBuilder->new();
$sbSigningString->Append("(request-target): ");
$sbSigningString->AppendLine($request_target,0);
$sbSigningString->Append("host: ");
$sbSigningString->AppendLine("api.ibanity.com",0);
$sbSigningString->Append("digest: ");
$sbSigningString->AppendLine($sbDigestHdrValue->getAsString(),0);
$sbSigningString->Append("(created): ");
$sbSigningString->AppendLine($created,0);
$sbSigningString->Append("ibanity-idempotency-key: ");
$idempotencyKey = $crypt->generateUuid();
$sbSigningString->Append($idempotencyKey);

# 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. 
$signed_headers_list = "(request-target) host digest (created) ibanity-idempotency-key";

# 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.

$privKey = chilkat::CkPrivateKey->new();
$success = $privKey->LoadEncryptedPemFile("my_ibanity_signature_private_key.pem","pem_password");
if ($success == 0) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

$rsa = chilkat::CkRsa->new();
$rsa->put_PssSaltLen(32);
$rsa->put_EncodingMode("base64");
# Use the RSASSA-PSS signature algorithm
$rsa->put_PkcsPadding(0);

$success = $rsa->UsePrivateKey($privKey);
if ($success == 0) {
    print $rsa->lastErrorText() . "\r\n";
    exit;
}

# Sign the signing string.
$sigBase64 = $rsa->signStringENC($sbSigningString->getAsString(),"sha-256");
if ($rsa->get_LastMethodSuccess() == 0) {
    print $rsa->lastErrorText() . "\r\n";
    exit;
}

# Build the signature header value.
$sbSigHeaderValue = chilkat::CkStringBuilder->new();
$sbSigHeaderValue->Append("keyId=\"");
# Use your identifier for the application's signature certificate, obtained from the Developer Portal
$sbSigHeaderValue->Append("62f02718-eeee-46e1-b5eb-e8fd6e799c2e");
$sbSigHeaderValue->Append("\",created=");
$sbSigHeaderValue->Append($created);
$sbSigHeaderValue->Append(",algorithm=\"hs2019\",headers=\"");
$sbSigHeaderValue->Append($signed_headers_list);
$sbSigHeaderValue->Append("\",signature=\"");
$sbSigHeaderValue->Append($sigBase64);
$sbSigHeaderValue->Append("\"");

print $sbSigHeaderValue->getAsString() . "\r\n";