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

See more Apple Keychain Examples

Demonstrates how RSA sign the utf-8 byte representation of a string to get the signature in base64 format.

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";