(Ruby) RSA Sign an Encoded Hash

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Demonstrates signing a hash (e.g., SHA256) provided as an encoded string (e.g., base64 or hex).

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

require 'chilkat'

# Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
# this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

# Chilkat automatically detects and determines the way in which the HSM is used,
# which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

cert = Chilkat::CkCert.new()

# Set the token/smartcard PIN prior to loading.
cert.put_SmartCardPin("123456")

# Specify the certificate by its common name.
success = cert.LoadFromSmartcard("cn=chilkat-rsa-2048")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

print "Signing with the private key for this cert: " + cert.subjectCN() + "\n";

# Create data to be hashed and signed.
bd = Chilkat::CkBinData.new()

for i in 0 .. 100
    bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex")
end

rsa = Chilkat::CkRsa.new()

# Use the certificate's private key for signing.
success = rsa.SetX509Cert(cert,true)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# We'll first compute the hash and then pass the encoded hash to be signed.
sha256_base64 = bd.getHash("sha256","base64")
print "sha256 hash in base64 format: " + sha256_base64 + "\n";

# Pass in the base64 hash and return a base64 signature.
rsa.put_EncodingMode("base64")
rsaSig_base64 = rsa.signHashENC(sha256_base64,"sha256")
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

print "RSA signature as base64: " + rsaSig_base64 + "\n";