title: Can't decrypt RSA data with open SSL
body: <p>I try to encrypt some data in matlab using a public key I created with openssl</p>
  
  <p>I created the keys using:</p>
  
  <pre><code>openssl genrsa -des3 -out private.pem 1024
  openssl rsa -in private.pem -pubout -outform DER -out public.der
  </code></pre>
  
  <p>I encrypt my data using this matlab code (with Java libraries):</p>
  
  <pre><code>import java.security.spec.RSAPublicKeySpec
  import javax.crypto.Cipher;
  import java.security.KeyFactory
  import java.math.BigInteger
  
  fid = fopen('public.der');
  a = fread(fid);
  key = java.security.spec.X509EncodedKeySpec(a);
  kf = KeyFactory.getInstance('RSA');
  KEY = kf.generatePublic(key);
  
  cipher = Cipher.getInstance('RSA/ECB/PKCS1Padding');
  cipher.init(Cipher.ENCRYPT_MODE, KEY)
  
  plaintextBytes = [24];
  ciphertext = cipher.doFinal(plaintextBytes)' ;
  
  fid2 = fopen('msg.txt','w');
  fwrite(fid2,ciphertext);
  fclose(fid2);
  </code></pre>
  
  <p>I try to decrypt it using:</p>
  
  <pre><code>openssl rsautl -decrypt -inkey private.pem  -in msg.txt -keyform PEM -pkcs
  </code></pre>
  
  <p>Then I get this error:</p>
  
  <pre><code>RSA operation error
  80305:error:0407109F:rsa routines:RSA_padding_check_PKCS1_type_2:pkcs decoding error:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-59.40.2/src/crypto/rsa/rsa_pk1.c:267:
  80305:error:04065072:rsa routines:RSA_EAY_PRIVATE_DECRYPT:padding check failed:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-59.40.2/src/crypto/rsa/rsa_eay.c:614:
  </code></pre>