Create a Public/Private Key from a PEM Base64Encode string in Haskell - haskell

Question

I'm trying to use RSA from cryptonite package to handle encryption and try to create an X509 cert (Data.X509) from a pem encoded cert base64Encoded string so i can access the Public and Private Key. However, i kept getting a "StreamConstructionWrongSize" error. I think i'm missing something here when reading the base64Encoded string in. I included the snippet of the codes. Perhaps, someone can spot the mistake. I'd really appreciate any help.
import Data.String.Conversions (cs)
import Crypto.Hash (hash, SHA256(..), Digest)
import Data.ByteString (ByteString)
import Data.Text.Encoding (encodeUtf8)
import qualified Data.Text.IO as TIO
import System.IO (hFlush, stdout)
import Data.ByteArray.Encoding (convertToBase, Base (Base64))
import Data.X509
main :: IO ()
main = do
let certBS = encodeUtf8 "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"
cert = decodeSignedCertificate certBS
case cert of
Left st -> putStrLn $ "Error reading cert: " ++ st
Right scrt -> do
let crt = getCertificate scrt
putStrLn $ show crt

Answer 1

Updated: I found the solution to my question. Hope this helps other who has the same problem
{-# LANGUAGE OverloadedStrings #-}
module Main where
import Data.String.Conversions (cs)
import Crypto.Hash (hash, SHA256(..), Digest)
import qualified Data.ByteString as BS (ByteString, readFile)
import Data.Text.Encoding (encodeUtf8)
import qualified Data.Text.IO as TIO
import System.IO (hFlush, stdout)
import Data.ByteArray.Encoding (convertToBase, Base (Base64))
import Data.List (head)
import Data.Text (Text(..))
----- Read file import
import Data.Monoid ((<>))
import Control.Applicative
import Data.ASN1.Types
import Data.ASN1.BinaryEncoding
import Data.ASN1.Encoding
import Data.Maybe
import qualified Data.X509 as X509
import Data.X509.Memory (pemToKey)
import Data.PEM (pemParseLBS, pemParseBS, pemWriteBS, pemContent, pemName, PEM)
import qualified Data.ByteString.Lazy as L
-------------------------
main :: IO ()
main = do
--pems <- readPEMs "./certs/test.pem" -- read from file
let cert1 = "-----BEGIN CERTIFICATE-----\n" ++ "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" ++ "\n-----END CERTIFICATE-----"
pems <- readPEM cert1
let certx = X509.decodeSignedObject $ pemContent $ head pems
case certx of
Left st1 -> putStrLn $ "Error reading cert: " ++ st1
Right scrt1 -> do
let crt1 = X509.getCertificate scrt1
print crt1
readPEM :: String -> IO [PEM]
readPEM content = --do
return $ either error id $ pemParseBS $ cs content
readPEMs :: FilePath -> IO [PEM]
readPEMs filepath = do
content <- BS.readFile filepath
return $ either error id $ pemParseBS content