(Ruby) Create Enveloping XML Signature with Multiple References

Demonstrates how to create an enveloping XML digital signature containing multiple Object references.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

# This example creates an XML signature that contains three Objects:
# 
# 1. A base64 encoded JPG image.
# 2. Some plain text.
# 3. Some JSON.
# 

# Get a small JPG image.
jpgData = Chilkat::CkBinData.new()
http = Chilkat::CkHttp.new()
success = http.QuickGetBd("https://www.chilkatsoft.com/images/starfish.jpg",jpgData)
if (success != true)
    print http.lastErrorText() + "\n";
    exit
end

# Get a small JSON document.
sbJson = Chilkat::CkStringBuilder.new()
success = http.QuickGetSb("https://www.chilkatsoft.com/exampleData/sample.json",sbJson)
if (success != true)
    print http.lastErrorText() + "\n";
    exit
end

# Get an RSA private key for signing.
sbPem = Chilkat::CkStringBuilder.new()
success = http.QuickGetSb("https://www.chilkatdownload.com/example_data/rsaprivkey_secret.pem",sbPem)
if (success != true)
    print http.lastErrorText() + "\n";
    exit
end

rsaKey = Chilkat::CkPrivateKey.new()
success = rsaKey.LoadEncryptedPem(sbPem.getAsString(),"secret")
if (success != true)
    print rsaKey.lastErrorText() + "\n";
    exit
end

# OK.. ready to begin building the signature.
gen = Chilkat::CkXmlDSigGen.new()

# Provide the RSA key to the XML Digital Signature generator
gen.SetPrivateKey(rsaKey)

# Add enveloped references to the content to be signed.
sbContent = Chilkat::CkStringBuilder.new()
sbContent.Append("The quick brown fox jumped over the lazy dog.")
gen.AddEnvelopedRef("aaa",sbContent,"sha256","C14N","")

gen.AddEnvelopedRef("bbb",sbJson,"sha256","C14N","")

sbBase64 = Chilkat::CkStringBuilder.new()
# Use "base64_mime" to encode the JPG data to base64 in multiple lines.
jpgData.GetEncodedSb("base64_mime",sbBase64)
gen.AddEnvelopedRef("ccc",sbBase64,"sha256","C14N","")

# Generate the XML digital signature.
sbXml = Chilkat::CkStringBuilder.new()
success = gen.CreateXmlDSigSb(sbXml)
if (success != true)
    print gen.lastErrorText() + "\n";
    exit
end

# Examine the enveloped signature, where the data for each reference is contained within the XML Signature
print sbXml.getAsString() + "\n";

# The exact XML signature looks like this:
# (A pretty-printed XML signature is shown further below, but beware that the introduced whitespace breaks the signature.)

# <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#aaa"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>f0KK1a9yt2XMxCcr5Keziiv4BpAev/rRt/CGSJwS9i0=</ds:DigestValue></ds:Reference><ds:Reference URI="#bbb"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>buBASaqBjJXez8r/hFz4ZIIf+1mgf63AoI8MihViJtU=</ds:DigestValue></ds:Reference><ds:Reference URI="#ccc"><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>+9PN/3Bz7xOuqi/wIBlGHEwPx+YUoILMsr2Iu0i1cCU=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>fI9l6/CKuwa7J2cczBzsKTOKec6cOVX/ehY2RcDZreGJlSo8bgv++nliFTwPyiZ8GT1Q2rDrA8biOt/ysZWnfim6AR79ld9CtLuKdqNsS/aSjwroDG/eWM0447zWoDSgAIsjXUAsF5xLschFW7+pGoPl5S1fVT/PUBkySlBi0I/U8P2UdiY8GoAL2rkHxTxDHaWh1GpBY28o9MSCuTgTiLVHF6WbmdHggqMc70OSTRh5vCMzZRTaAkTH6SWYt2WczKwmVea7hkM3BhpbA3EnpEIxK7TFl2GkFGXxAyXAxe2SVmXngt025LOFtU72fE+eChbqr5tejWl81z1g2F7ZnQ==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:RSAKeyValue><ds:Modulus>sXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNiwUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv/gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyTEvb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUbE9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue></ds:KeyValue></ds:KeyInfo><ds:Object Id="aaa">The quick brown fox jumped over the lazy dog.</ds:Object><ds:Object Id="bbb">{
#    "apple": "red",
#    "lime": "green",
#    "banana": "yellow",
#    "broccoli": "green",
#    "strawberry": "red"
# }
# </ds:Object><ds:Object Id="ccc">/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA
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