Lua Requires Chilkat v11.0.0+

Duplicate OpensSSL Command that Decrypts Binary DER

See more OpenSSL Examples

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Lua

local chilkat = require("chilkat")

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

local crypt = chilkat.Crypt2.new()

crypt.crypt_algorithm = "pki"

local pem = chilkat.Pem.new()
local success = pem:load_pem_file("qa_data/pem/myPem.pem", "password")
if not success then
    print(pem.last_error_text)
    return
end

local privkey = chilkat.PrivateKey.new()
success = pem:private_key_at(0, privkey)
if not success then
    print(pem.last_error_text)
    return
end

local cert = chilkat.Cert.new()
success = pem:cert_at(0, cert)
if not success then
    print(pem.last_error_text)
    return
end

success = crypt:set_decrypt_cert2(cert, privkey)
if not success then
    print(crypt.last_error_text)
    return
end

success = crypt:ck_decrypt_file("qa_data/infile.enc", "qa_output/outfile.dat")
if not success then
    print(crypt.last_error_text)
    return
end

print("Success.")