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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 PowerShell Downloads
Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"
$success = $false
# 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 = New-Object Chilkat.StringBuilder
$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 = New-Object Chilkat.PublicKey
$success = $rsaKey.LoadFromString($sbRsaJwk.GetAsString())
if ($success -eq $false) {
$($rsaKey.LastErrorText)
exit
}
# ---------------------------------------------------
# Use the following ECC public key loaded from JWK format.
$sbEccJwk = New-Object Chilkat.StringBuilder
$sbEccJwk.Append("{`"kty`":`"EC`",")
$sbEccJwk.Append("`"crv`":`"P-256`",")
$sbEccJwk.Append("`"x`":`"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU`",")
$sbEccJwk.Append("`"y`":`"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0`"")
$sbEccJwk.Append("}")
$eccKey = New-Object Chilkat.PublicKey
$success = $eccKey.LoadFromString($sbEccJwk.GetAsString())
if ($success -eq $false) {
$($eccKey.LastErrorText)
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 = New-Object Chilkat.StringBuilder
$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 = New-Object Chilkat.Jws
$success = $jws.LoadJwsSb($sbJws)
if ($success -eq $false) {
$($jws.LastErrorText)
exit
}
# The payload is easily accessible:
$("Payload: " + $jws.GetPayload("utf-8"))
$sbKeyId = New-Object Chilkat.StringBuilder
$bCaseSensitive = $false
$protHeader = New-Object Chilkat.JsonObject
$numSignatures = $jws.NumSignatures
$i = 0
while ($i -lt $numSignatures) {
$success = $jws.GetProtectedH($i,$protHeader)
if ($success -eq $false) {
$($jws.LastErrorText)
exit
}
$("--------------------------")
$([string]$i + ": ")
# Get the protected header.
$protHeader.EmitCompact = $false
$($protHeader.Emit())
# 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) -eq $true) {
$jws.SetPublicKey($i,$rsaKey)
}
if ($sbKeyId.ContentsEqual("myEcKey",$bCaseSensitive) -eq $true) {
$jws.SetPublicKey($i,$eccKey)
}
if ($sbKeyId.ContentsEqual("myMacKey",$bCaseSensitive) -eq $true) {
$jws.SetMacKey($i,$hmacKey,"base64url")
}
# Validate this signature.
$v = $jws.Validate($i)
if ($v -lt 0) {
# Perhaps Chilkat was not unlocked or the trial expired..
$("Validate failed for some other reason.")
$($jws.LastErrorText)
}
else {
if ($v -eq 0) {
$("Invalid signature. The key was incorrect, the JWS was invalid, or both.")
}
else {
$("Signature validated.")
}
}
$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.