Ruby

Encrypt a file to a PKCS7 encrypted message using multiple certificates from different users

See more Encryption Examples

Demonstrates how to encrypt a file to a PKCS7 encrypted message using multiple certificates from different users. Any one of the users can decrypt using his/her own certificate + private key.

Note: When doing public key encryption, it is the public key that is used to encrypt. The private key is required for decryption.

Ruby

require 'chilkat'

success = false

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

crypt = Chilkat::CkCrypt2.new()

# Tell the crypt object to use 3 certificates.
# Do this by calling AddEncryptCert for each certificate.

# Load a digital certificate. 
# We don't need the private key for encryption.
# Only the public key is needed (which is included in a certificate).
cert1 = Chilkat::CkCert.new()
success = cert1.LoadFromFile("qa_data/user1/cert_user1.pem")
# Assume success for the example, but make sure your application checks for success/failure...
crypt.AddEncryptCert(cert1)

cert2 = Chilkat::CkCert.new()
success = cert2.LoadFromFile("qa_data/user2/cert_user2.pem")
crypt.AddEncryptCert(cert2)

cert3 = Chilkat::CkCert.new()
success = cert3.LoadFromFile("qa_data/user3/cert_user3.pem")
crypt.AddEncryptCert(cert3)

# Indicate that we want PKI encryption (i.e. public-key infrastructure)
# to produce a CMS message (Cryptographic Message Syntax/PKCS7),
# that is be created with RSAES-OAEP padding, SHA256, and AES-128 for the
# bulk encryption.
crypt.put_CryptAlgorithm("pki")
crypt.put_Pkcs7CryptAlg("aes")
crypt.put_KeyLength(128)
crypt.put_OaepHash("sha256")
crypt.put_OaepPadding(true)

# Load the file to be encrypted...
fileData = Chilkat::CkBinData.new()
success = fileData.LoadFile("qa_data/jpg/penguins.jpg")
# Your app should check for success/failure..

# Encrypt the data.  The contents of the fileData object are replaced with the PKCS7 encrypted message.
success = crypt.EncryptBd(fileData)
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

# Save the PKCS7 encrypted message to a file..
success = fileData.WriteFile("qa_output/pkcs7_encrypted.p7")

# Now indicate that the PKCS7 output is to be returned in the base64 encoding.
crypt.put_EncodingMode("base64")

print "OK." + "\n";