Ruby

RSA Hash Binary Data and Sign (and Verify)

See more RSA Examples

Demonstrates how to sign the hash of binary data. Also demonstrates how to verify the RSA signature. Ruby

require 'chilkat'

success = false

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

# Load an RSA private key for signing.
privKey = Chilkat::CkPrivateKey.new()
success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
if (success == false)
    print privKey.lastErrorText() + "\n";
    exit
end

rsa = Chilkat::CkRsa.new()
rsa.UsePrivateKey(privKey)

# We have some binary data (in hex) to sign
originalData = "0102030405060708090A"
bdData = Chilkat::CkBinData.new()
bdData.AppendEncoded(originalData,"hex")

# Hash (SHA-256) and sign the hash:
bdSignature = Chilkat::CkBinData.new()
success = rsa.SignBd(bdData,"sha256",bdSignature)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# Show the RSA signature in base64
print bdSignature.getEncoded("base64") + "\n";

# ------------------------------------------
# Get the public key from the private key
pubKey = Chilkat::CkPublicKey.new()
privKey.ToPublicKey(pubKey)

# Verify the signature..
rsa2 = Chilkat::CkRsa.new()
rsa2.UsePublicKey(pubKey)

bVerified = rsa2.VerifyBd(bdData,"sha256",bdSignature)
print "signature verified: " + bVerified.to_s() + "\n";