(Ruby) RSA Sign utf-8 Bytes of String to get Base64 RSA Signature

See more Apple Keychain Examples

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 cert: " + cert.subjectCN() + "\n";

# Create a string to be hashed and signed.
sb = Chilkat::CkStringBuilder.new()
crlfLineEnding = true

for i in 0 .. 10
    sb.AppendLine("This is a test.",crlfLineEnding)
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

# Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
# Return the signature in base64 format.
rsa.put_EncodingMode("base64")
rsa.put_Charset("utf-8")
stringToSign = sb.getAsString()
sigBase64 = rsa.signStringENC(stringToSign,"sha256")
if (rsa.get_LastMethodSuccess() == false)
    print rsa.lastErrorText() + "\n";
    exit
end

print "RSA signature as base64: " + sigBase64 + "\n";