How do I decrypt an AES key using C# Bouncy Castle that was encrypted using Libgcrypt raw flag

Question

Summary: I am attempting to decrypt (and eventually encrypt and return) files that are AES128 encrypted. The AES key is encrypted using libcrypt's RSA provider. When I attempt to decrypt the AESKey on Windows 7 using C# & BouncyCastle a "block truncated" error is thrown when I call "ProcessBlock". I have tried converting the data to BigEndian and I'll get a "Not a valid RSA exponent" when I try to create the RsaKeyParameters.

The encryption was done using libgcrypt 1.2x on a linux system. I think it's a padding issue since this snippet of code indicates that no padding is used. gcry_sexp_build(&PlainKeyExp, NULL, "(data (flags raw) (value %s))", AESKey );

Unfortunately I cannot change the originating system. I'm including code samples & keys below to help. This has been driving me insane for the past 3 days. I've scoured the interwebz and have not found a solution. Thank you in advance for your help.

Originating code snippet

static const char RSAPrivateKey[] =
"(private-key"
" (rsa"
"  (n #00e0ce96f90b6c9e02f3922beada93fe50a875eac6bcc18bb9a9cf2e84965caa"
"      2d1ff95a7f542465c6c0c19d276e4526ce048868a7a914fd343cc3a87dd74291"
"      ffc565506d5bbb25cbac6a0e2dd1f8bcaab0d4a29c2f37c950f363484bf269f7"
"      891440464baf79827e03a36e70b814938eebdc63e964247be75dc58b014b7ea251#)"
"  (e #010001#)"
"  (d #046129f2489d71579be0a75fe029bd6cdb574ebf57ea8a5b0fda942cab943b11"
"      7d7bb95e5d28875e0f9fc5fcc06a72f6d502464dabded78ef6b716177b83d5bd"
"      c543dc5d3fed932e59f5897e92e6f58a0f33424106a3b6fa2cbf877510e4ac21"
"      c3ee47851e97d12996222ac3566d4ccb0b83d164074abf7de655fc2446da1781#)"
"  (p #00e861b700e17e8afe6837e7512e35b6ca11d0ae47d8b85161c67baf64377213"
"      fe52d772f2035b3ca830af41d8a4120e1c1c70d12cc22f00d28d31dd48a8d424f1#)"
"  (q #00f7a7ca5367c661f8e62df34f0d05c10c88e5492348dd7bddc942c9a8f369f9"
"      35a07785d2db805215ed786e4285df1658eed3ce84f469b81b50d358407b4ad361#)"
"  (u #304559a9ead56d2309d203811a641bb1a09626bc8eb36fffa23c968ec5bd891e"
"      ebbafc73ae666e01ba7c8990bae06cc2bbe10b75e69fcacb353a6473079d8e9b#)))";

Error = gcry_sexp_sscan(&PublicKey, NULL, RSAPublicKey, strlen(RSAPublicKey));
if ( Error ) { goto Return; }

Error = gcry_sexp_sscan(&PrivateKey, NULL, RSAPrivateKey, strlen(RSAPrivateKey));
if ( Error ) { goto Return; }

Error = gcry_sexp_build(&PlainKeyExp, NULL, "(data (flags raw) (value %s))", AESKey );
gpg_strerror_r(Error, Output, 500);
if ( Error ) { goto Return; }

Error = gcry_pk_encrypt(&Encrypted, PlainKeyExp, PublicKey);
if ( Error ) { goto Return; }

if ( gcry_sexp_sprint(Encrypted, GCRYSEXP_FMT_CANON, Output, 500) <= 0 ) { Error = TRUE; goto Return; }
Encrypted = gcry_sexp_find_token(Encrypted, "a", 0);
if ( Encrypted == NULL ) { Error = TRUE; goto Return; }

if ( gcry_sexp_sprint(Encrypted, GCRYSEXP_FMT_ADVANCED, Output, 500) <= 0 ) { Error = TRUE; goto Return; }
if ( strtok(Output, "#") != NULL ) {
    Output2 = strtok(NULL, "#");
    if ( Output2 != NULL ) { sprintf(EncryptedKey,"%s", Output2); }
    else { Error = TRUE; }
} else { Error = TRUE; }

Decoding code snippet

var modulus ="00e0ce96f90b6c9e02f3922beada93fe50a875eac6bcc18bb9a9cf2e84965caa2d1ff95a7f542465c6c0c19d276e4526ce048868a7a914fd343cc3a87dd74291ffc565506d5bbb25cbac6a0e2dd1f8bcaab0d4a29c2f37c950f363484bf269f7891440464baf79827e03a36e70b814938eebdc63e964247be75dc58b014b7ea251";

var privateExponent ="046129f2489d71579be0a75fe029bd6cdb574ebf57ea8a5b0fda942cab943b117d7bb95e5d28875e0f9fc5fcc06a72f6d502464dabded78ef6b716177b83d5bdc543dc5d3fed932e59f5897e92e6f58a0f33424106a3b6fa2cbf877510e4ac21c3ee47851e97d12996222ac3566d4ccb0b83d164074abf7de655fc2446da1781";

var encryptedAesKey ="77FD84196959DDE3C367952B3C25B34582B489A705FB3C61D69D04DDA16B011F6358F32834DD76BF81A1DF28106F377FF1125F91CA39BB92D293B8F5134C15C17DE1157390723301A01B938489E04DA1D8D4A70511F0FF2508984710CEB3F18D4BA929C18487A0977011BDE169DBBF3047646FBFBC50ED5A02FC40E53E59B8CD";

try
{
  // Convert to biginteger
  var bcMod = new Org.BouncyCastle.Math.BigInteger(Hex.Decode(modulus));
  var bcPrivateExponent = new Org.BouncyCastle.Math.BigInteger(Hex.Decode(privateExponent));
  byte[] decodedAesKey = Hex.Decode(encryptedAesKey);

  // Init bouncyCastle
  var privParameters = new RsaKeyParameters(true, bcMod, bcPrivateExponent);
  var eng = new Pkcs1Encoding(new RsaEngine());
  eng.Init(false, privParameters);

  var ret = eng.ProcessBlock(decodedAesKey, 0, 128);
}
catch (Exception e)
{
  Console.WriteLine(e);
}

Answer 1

The answer is simply to remove the new Pkcs1Encoding() constructor call and directly use RsaEngine. If there is no padding, then there is no need to remove or validate it.

Note that padding is a requirement to create a secure RSA based ciphertext. So this is OK to overcome compatibility issues, but the system should be replaced right away.