Ruby

Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

See more RSA Examples

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Ruby

require 'chilkat'

success = false

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

pkey = Chilkat::CkPrivateKey.new()

# Load the private key from an RSA PEM file:
success = pkey.LoadPemFile("myKey.pem")

rsa = Chilkat::CkRsa.new()

# Import the private key into the RSA component:
success = rsa.UsePrivateKey(pkey)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# OpenSSL uses BigEndian byte ordering:
rsa.put_LittleEndian(false)

# The resulting signature will be a Base64 string:
rsa.put_EncodingMode("base64")

# For simplicity, we're not loading
# the data to be signed from a file.  We are instead simply
# using a literal string value.  
strData = "This is the text to be signed."

# Hash the input using MD5, and then sign the hash:
# Other valid hash algorithm choices are "md2" and "sha-1".
base64Sig = rsa.signStringENC(strData,"md5")

print base64Sig + "\n";

print "Success!" + "\n";