Perl Requires Chilkat v11.0.0+
Perl
Validate JWS with Multiple Signatures using the General JSON Serialization Format
See more JSON Web Signatures (JWS) Examples
Validates and recovers data and headers from a JSON Web Signature (JWS) containing 3 signatures.Note: Chilkat supports all of the following JWS algorithms:
+--------------+-------------------------------+--------------------+ | "alg" Param | Digital Signature or MAC | Implementation | | Value | Algorithm | Requirements | +--------------+-------------------------------+--------------------+ | HS256 | HMAC using SHA-256 | Required | | HS384 | HMAC using SHA-384 | Optional | | HS512 | HMAC using SHA-512 | Optional | | RS256 | RSASSA-PKCS1-v1_5 using | Recommended | | | SHA-256 | | | RS384 | RSASSA-PKCS1-v1_5 using | Optional | | | SHA-384 | | | RS512 | RSASSA-PKCS1-v1_5 using | Optional | | | SHA-512 | | | ES256 | ECDSA using P-256 and SHA-256 | Recommended+ | | ES384 | ECDSA using P-384 and SHA-384 | Optional | | ES512 | ECDSA using P-521 and SHA-512 | Optional | | PS256 | RSASSA-PSS using SHA-256 and | Optional | | | MGF1 with SHA-256 | | | PS384 | RSASSA-PSS using SHA-384 and | Optional | | | MGF1 with SHA-384 | | | PS512 | RSASSA-PSS using SHA-512 and | Optional | | | MGF1 with SHA-512 | | +--------------+-------------------------------+--------------------+
Chilkat Perl Downloads
use chilkat();
$success = 0;
# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.
# First, prepare the public keys that will be needed for each signature.
# ---------------------------------------------------
# Use the following RSA key loaded from JWK format.
$sbRsaJwk = chilkat::CkStringBuilder->new();
$sbRsaJwk->Append("{\"kty\":\"RSA\",");
$sbRsaJwk->Append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx");
$sbRsaJwk->Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs");
$sbRsaJwk->Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH");
$sbRsaJwk->Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV");
$sbRsaJwk->Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8");
$sbRsaJwk->Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",");
$sbRsaJwk->Append("\"e\":\"AQAB\"");
$sbRsaJwk->Append("}");
$rsaKey = chilkat::CkPublicKey->new();
$success = $rsaKey->LoadFromString($sbRsaJwk->getAsString());
if ($success == 0) {
print $rsaKey->lastErrorText() . "\r\n";
exit;
}
# ---------------------------------------------------
# Use the following ECC public key loaded from JWK format.
$sbEccJwk = chilkat::CkStringBuilder->new();
$sbEccJwk->Append("{\"kty\":\"EC\",");
$sbEccJwk->Append("\"crv\":\"P-256\",");
$sbEccJwk->Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",");
$sbEccJwk->Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\"");
$sbEccJwk->Append("}");
$eccKey = chilkat::CkPublicKey->new();
$success = $eccKey->LoadFromString($sbEccJwk->getAsString());
if ($success == 0) {
print $eccKey->lastErrorText() . "\r\n";
exit;
}
# ---------------------------------------------------
# The HMAC key (in base64url format)
$hmacKey = "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow";
# The code below will verify each of the signatures in this JWS:
# {
# "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
# "signatures": [
# {
# "protected": "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0",
# "signature": "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw"
# },
# {
# "protected": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ",
# "signature": "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw"
# },
# {
# "protected": "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0",
# "signature": "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw"
# }
# ]
# }
$sbJws = chilkat::CkStringBuilder->new();
$sbJws->Append("{ ");
$sbJws->Append(" \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\",");
$sbJws->Append(" \"signatures\": [");
$sbJws->Append(" { ");
$sbJws->Append(" \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\",");
$sbJws->Append(" \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\"");
$sbJws->Append(" },");
$sbJws->Append(" { ");
$sbJws->Append(" \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\",");
$sbJws->Append(" \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\"");
$sbJws->Append(" },");
$sbJws->Append(" { ");
$sbJws->Append(" \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\",");
$sbJws->Append(" \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\"");
$sbJws->Append(" }");
$sbJws->Append(" ]");
$sbJws->Append("}");
$jws = chilkat::CkJws->new();
$success = $jws->LoadJwsSb($sbJws);
if ($success == 0) {
print $jws->lastErrorText() . "\r\n";
exit;
}
# The payload is easily accessible:
print "Payload: " . $jws->getPayload("utf-8") . "\r\n";
$sbKeyId = chilkat::CkStringBuilder->new();
$bCaseSensitive = 0;
$protHeader = chilkat::CkJsonObject->new();
$numSignatures = $jws->get_NumSignatures();
$i = 0;
while ($i < $numSignatures) {
$success = $jws->GetProtectedH($i,$protHeader);
if ($success == 0) {
print $jws->lastErrorText() . "\r\n";
exit;
}
print "--------------------------" . "\r\n";
print $i . ": " . "\r\n";
# Get the protected header.
$protHeader->put_EmitCompact(0);
print $protHeader->emit() . "\r\n";
# Get the key ID ("kid") member.
# Note: In this example, the "kid" values are contained in the protected headers.
# They could've just as easily been located in unprotected headers. In that case,
# we would've called GetUnprotectedH instead of GetProtectedH(i).
$sbKeyId->Clear();
$sbKeyId->Append($protHeader->stringOf("kid"));
# Set the key based on key ID.
if ($sbKeyId->ContentsEqual("myRsaKey",$bCaseSensitive) == 1) {
$jws->SetPublicKey($i,$rsaKey);
}
if ($sbKeyId->ContentsEqual("myEcKey",$bCaseSensitive) == 1) {
$jws->SetPublicKey($i,$eccKey);
}
if ($sbKeyId->ContentsEqual("myMacKey",$bCaseSensitive) == 1) {
$jws->SetMacKey($i,$hmacKey,"base64url");
}
# Validate this signature.
$v = $jws->Validate($i);
if ($v < 0) {
# Perhaps Chilkat was not unlocked or the trial expired..
print "Validate failed for some other reason." . "\r\n";
print $jws->lastErrorText() . "\r\n";
}
else {
if ($v == 0) {
print "Invalid signature. The key was incorrect, the JWS was invalid, or both." . "\r\n";
}
else {
print "Signature validated." . "\r\n";
}
}
$i = $i + 1;
}
# The output of this program is:
# Payload: In our village, folks say God crumbles up the old moon into stars.
# --------------------------
# 0:
# {
# "alg": "RS256",
# "kid": "myRsaKey"
# }
#
# Signature validated.
# --------------------------
# 1:
# {
# "alg": "ES256",
# "kid": "myEcKey"
# }
#
# Signature validated.
# --------------------------
# 2:
# {
# "alg": "HS256",
# "kid": "myMacKey"
# }
#
# Signature validated.