(PowerShell) Signing HTTP Messages

Demonstrates how to sign HTTP messages per draft-cavage-http-signatures-10

For more information, see https://tools.ietf.org/html/draft-cavage-http-signatures-10

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$bCrlf = $true
$sbPublicKeyPem = New-Object Chilkat.StringBuilder
$sbPublicKeyPem.AppendLine("-----BEGIN PUBLIC KEY-----",$bCrlf)
$sbPublicKeyPem.AppendLine("MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDCFENGw33yGihy92pDjZQhl0C3",$bCrlf)
$sbPublicKeyPem.AppendLine("6rPJj+CvfSC8+q28hxA161QFNUd13wuCTUcq0Qd2qsBe/2hFyc2DCJJg0h1L78+6",$bCrlf)
$sbPublicKeyPem.AppendLine("Z4UMR7EOcpfdUE9Hf3m/hs+FUR45uBJeDK1HSFHD8bHKD6kv8FPGfJTotc+2xjJw",$bCrlf)
$sbPublicKeyPem.AppendLine("oYi+1hqp1fIekaxsyQIDAQAB",$bCrlf)
$sbPublicKeyPem.AppendLine("-----END PUBLIC KEY-----",$bCrlf)

$pubKey = New-Object Chilkat.PublicKey
$pubKey.LoadFromString($sbPublicKeyPem.GetAsString())

$sbPrivateKeyPem = New-Object Chilkat.StringBuilder
$sbPrivateKeyPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",$bCrlf)
$sbPrivateKeyPem.AppendLine("MIICXgIBAAKBgQDCFENGw33yGihy92pDjZQhl0C36rPJj+CvfSC8+q28hxA161QF",$bCrlf)
$sbPrivateKeyPem.AppendLine("NUd13wuCTUcq0Qd2qsBe/2hFyc2DCJJg0h1L78+6Z4UMR7EOcpfdUE9Hf3m/hs+F",$bCrlf)
$sbPrivateKeyPem.AppendLine("UR45uBJeDK1HSFHD8bHKD6kv8FPGfJTotc+2xjJwoYi+1hqp1fIekaxsyQIDAQAB",$bCrlf)
$sbPrivateKeyPem.AppendLine("AoGBAJR8ZkCUvx5kzv+utdl7T5MnordT1TvoXXJGXK7ZZ+UuvMNUCdN2QPc4sBiA",$bCrlf)
$sbPrivateKeyPem.AppendLine("QWvLw1cSKt5DsKZ8UETpYPy8pPYnnDEz2dDYiaew9+xEpubyeW2oH4Zx71wqBtOK",$bCrlf)
$sbPrivateKeyPem.AppendLine("kqwrXa/pzdpiucRRjk6vE6YY7EBBs/g7uanVpGibOVAEsqH1AkEA7DkjVH28WDUg",$bCrlf)
$sbPrivateKeyPem.AppendLine("f1nqvfn2Kj6CT7nIcE3jGJsZZ7zlZmBmHFDONMLUrXR/Zm3pR5m0tCmBqa5RK95u",$bCrlf)
$sbPrivateKeyPem.AppendLine("412jt1dPIwJBANJT3v8pnkth48bQo/fKel6uEYyboRtA5/uHuHkZ6FQF7OUkGogc",$bCrlf)
$sbPrivateKeyPem.AppendLine("mSJluOdc5t6hI1VsLn0QZEjQZMEOWr+wKSMCQQCC4kXJEsHAve77oP6HtG/IiEn7",$bCrlf)
$sbPrivateKeyPem.AppendLine("kpyUXRNvFsDE0czpJJBvL/aRFUJxuRK91jhjC68sA7NsKMGg5OXb5I5Jj36xAkEA",$bCrlf)
$sbPrivateKeyPem.AppendLine("gIT7aFOYBFwGgQAQkWNKLvySgKbAZRTeLBacpHMuQdl1DfdntvAyqpAZ0lY0RKmW",$bCrlf)
$sbPrivateKeyPem.AppendLine("G6aFKaqQfOXKCyWoUiVknQJAXrlgySFci/2ueKlIE1QqIiLSZ8V8OlpFLRnb1pzI",$bCrlf)
$sbPrivateKeyPem.AppendLine("7U1yQXnTAEFYM560yJlzUpOb1V4cScGd365tiSMvxLOvTA==",$bCrlf)
$sbPrivateKeyPem.AppendLine("-----END RSA PRIVATE KEY-----",$bCrlf)

$privKey = New-Object Chilkat.PrivateKey
$privKey.LoadPem($sbPrivateKeyPem.GetAsString())

#    All examples use this request:
# 
#    POST /foo?param=value&pet=dog HTTP/1.1
#    Host: example.com
#    Date: Sun, 05 Jan 2014 21:31:40 GMT
#    Content-Type: application/json
#    Digest: SHA-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=
#    Content-Length: 18
# 
#    {"hello": "world"}

# C.1.  Default Test
# 
#    If a list of headers is not included, the date is the only header
#    that is signed by default.  The string to sign would be:
# 
#    date: Sun, 05 Jan 2014 21:31:40 GMT
# 
#    The Authorization header would be:
# 
#    Authorization: Signature keyId="Test",algorithm="rsa-sha256",
#    signature="SjWJWbWN7i0wzBvtPl8rbASWz5xQW6mcJmn+ibttBqtifLN7Sazz
#    6m79cNfwwb8DMJ5cou1s7uEGKKCs+FLEEaDV5lp7q25WqS+lavg7T8hc0GppauB
#    6hbgEKTwblDHYGEtbGmtdHgVCk9SuS13F0hZ8FD0k/5OxEPXe5WozsbM="
# 
#    The Signature header would be:
# 
#    Signature: keyId="Test",algorithm="rsa-sha256",
#    signature="SjWJWbWN7i0wzBvtPl8rbASWz5xQW6mcJmn+ibttBqtifLN7Sazz
#    6m79cNfwwb8DMJ5cou1s7uEGKKCs+FLEEaDV5lp7q25WqS+lavg7T8hc0GppauB
#    6hbgEKTwblDHYGEtbGmtdHgVCk9SuS13F0hZ8FD0k/5OxEPXe5WozsbM="
# 

$dtNow = New-Object Chilkat.CkDateTime
$success = $dtNow.SetFromCurrentSystemTime()
$dateStr = $dtNow.GetAsRfc822($false)

# To duplicate the above result, we'll hard-code the date string.
$dateStr = "Sun, 05 Jan 2014 21:31:40 GMT"

$rsa = New-Object Chilkat.Rsa
$success = $rsa.ImportPrivateKeyObj($privKey)
if ($success -eq $false) {
    $($rsa.LastErrorText)
    exit
}

$sbStringToSign = New-Object Chilkat.StringBuilder
$sbStringToSign.Append("date: ")
$sbStringToSign.Append($dateStr)

$rsa.EncodingMode = "base64"
$b64Signature = $rsa.SignStringENC($sbStringToSign.GetAsString(),"SHA256")
$($b64Signature)
$("---------------------------")

# The result should be:
# SjWJWbWN7i0wzBvtPl8rbASW ... FD0k/5OxEPXe5WozsbM=

# ----------------------------------------------------------------------------------------------------

# C.2.  Basic Test
# 
#    The minimum recommended data to sign is the (request-target), host,
#    and date.  In this case, the string to sign would be:
# 
#    (request-target): post /foo?param=value&pet=dog
#    host: example.com
#    date: Sun, 05 Jan 2014 21:31:40 GMT
# 
#    The Authorization header would be:
# 
#    Authorization: Signature keyId="Test",algorithm="rsa-sha256",
#    headers="(request-target) host date", signature="qdx+H7PHHDZgy4
#    y/Ahn9Tny9V3GP6YgBPyUXMmoxWtLbHpUnXS2mg2+SbrQDMCJypxBLSPQR2aAjn
#    7ndmw2iicw3HMbe8VfEdKFYRqzic+efkb3nndiv/x1xSHDJWeSWkx3ButlYSuBs
#    kLu6kd9Fswtemr3lgdDEmn04swr2Os0="

$sbStringToSign.Clear()
$sbStringToSign.Append("(request-target): ")
$sbStringToSign.AppendLine("post /foo?param=value&pet=dog",$false)
$sbStringToSign.Append("host: ")
$sbStringToSign.AppendLine("example.com",$false)
$sbStringToSign.Append("date: ")
$sbStringToSign.Append($dateStr)

$("StringToSign:")
$($sbStringToSign.GetAsString())
$b64Signature = $rsa.SignStringENC($sbStringToSign.GetAsString(),"SHA256")
$($b64Signature)
$("---------------------------")

# The result should be:
# qdx+H7PHHDZgy4y/Ahn ... mn04swr2Os0=