1 files changed, 313 insertions, 0 deletions
diff --git a/src/pubkey/pk_codecs/pkcs8.cpp b/src/pubkey/pk_codecs/pkcs8.cpp
new file mode 100644
index 000000000..87f05da92
--- /dev/null
+++ b/src/pubkey/pk_codecs/pkcs8.cpp
@@ -0,0 +1,313 @@
+/*
+* PKCS #8
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/pkcs8.h>
+#include <botan/get_pbe.h>
+#include <botan/der_enc.h>
+#include <botan/ber_dec.h>
+#include <botan/asn1_obj.h>
+#include <botan/pk_algs.h>
+#include <botan/oids.h>
+#include <botan/pem.h>
+#include <memory>
+
+namespace Botan {
+
+namespace PKCS8 {
+
+namespace {
+
+/*
+* Get info from an EncryptedPrivateKeyInfo
+*/
+SecureVector<byte> PKCS8_extract(DataSource& source,
+                                 AlgorithmIdentifier& pbe_alg_id)
+   {
+   SecureVector<byte> key_data;
+
+   BER_Decoder(source)
+      .start_cons(SEQUENCE)
+         .decode(pbe_alg_id)
+         .decode(key_data, OCTET_STRING)
+      .verify_end();
+
+   return key_data;
+   }
+
+/*
+* PEM decode and/or decrypt a private key
+*/
+SecureVector<byte> PKCS8_decode(DataSource& source, const User_Interface& ui,
+                                AlgorithmIdentifier& pk_alg_id)
+   {
+   AlgorithmIdentifier pbe_alg_id;
+   SecureVector<byte> key_data, key;
+   bool is_encrypted = true;
+
+   try {
+      if(ASN1::maybe_BER(source) && !PEM_Code::matches(source))
+         key_data = PKCS8_extract(source, pbe_alg_id);
+      else
+         {
+         std::string label;
+         key_data = PEM_Code::decode(source, label);
+         if(label == "PRIVATE KEY")
+            is_encrypted = false;
+         else if(label == "ENCRYPTED PRIVATE KEY")
+            {
+            DataSource_Memory key_source(key_data);
+            key_data = PKCS8_extract(key_source, pbe_alg_id);
+            }
+         else
+            throw PKCS8_Exception("Unknown PEM label " + label);
+         }
+
+      if(key_data.is_empty())
+         throw PKCS8_Exception("No key data found");
+      }
+   catch(Decoding_Error)
+      {
+      throw Decoding_Error("PKCS #8 private key decoding failed");
+      }
+
+   if(!is_encrypted)
+      key = key_data;
+
+   const u32bit MAX_TRIES = 3;
+
+   u32bit tries = 0;
+   while(true)
+      {
+      try {
+         if(MAX_TRIES && tries >= MAX_TRIES)
+            break;
+
+         if(is_encrypted)
+            {
+            DataSource_Memory params(pbe_alg_id.parameters);
+            std::unique_ptr<PBE> pbe(get_pbe(pbe_alg_id.oid, params));
+
+            User_Interface::UI_Result result = User_Interface::OK;
+            const std::string passphrase =
+               ui.get_passphrase("PKCS #8 private key", source.id(), result);
+
+            if(result == User_Interface::CANCEL_ACTION)
+               break;
+
+            pbe->set_key(passphrase);
+            Pipe decryptor(pbe.release());
+
+            decryptor.process_msg(key_data, key_data.size());
+            key = decryptor.read_all();
+            }
+
+         u32bit version;
+
+         BER_Decoder(key)
+            .start_cons(SEQUENCE)
+               .decode(version)
+               .decode(pk_alg_id)
+               .decode(key, OCTET_STRING)
+               .discard_remaining()
+            .end_cons();
+
+         if(version != 0)
+            throw Decoding_Error("PKCS #8: Unknown version number");
+
+         break;
+         }
+      catch(Decoding_Error)
+         {
+         ++tries;
+         }
+      }
+
+   if(key.is_empty())
+      throw Decoding_Error("PKCS #8 private key decoding failed");
+   return key;
+   }
+
+}
+
+/*
+* DER or PEM encode a PKCS #8 private key
+*/
+void encode(const Private_Key& key, Pipe& pipe, X509_Encoding encoding)
+   {
+   std::unique_ptr<PKCS8_Encoder> encoder(key.pkcs8_encoder());
+   if(!encoder.get())
+      throw Encoding_Error("PKCS8::encode: Key does not support encoding");
+
+   const u32bit PKCS8_VERSION = 0;
+
+   SecureVector<byte> contents =
+      DER_Encoder()
+         .start_cons(SEQUENCE)
+            .encode(PKCS8_VERSION)
+            .encode(encoder->alg_id())
+            .encode(encoder->key_bits(), OCTET_STRING)
+         .end_cons()
+      .get_contents();
+
+   if(encoding == PEM)
+      pipe.write(PEM_Code::encode(contents, "PRIVATE KEY"));
+   else
+      pipe.write(contents);
+   }
+
+/*
+* Encode and encrypt a PKCS #8 private key
+*/
+void encrypt_key(const Private_Key& key,
+                 Pipe& pipe,
+                 RandomNumberGenerator& rng,
+                 const std::string& pass, const std::string& pbe_algo,
+                 X509_Encoding encoding)
+   {
+   const std::string DEFAULT_PBE = "PBE-PKCS5v20(SHA-1,TripleDES/CBC)";
+
+   Pipe raw_key;
+   raw_key.start_msg();
+   encode(key, raw_key, RAW_BER);
+   raw_key.end_msg();
+
+   std::unique_ptr<PBE> pbe(get_pbe(((pbe_algo != "") ? pbe_algo : DEFAULT_PBE)));
+
+   pbe->new_params(rng);
+   pbe->set_key(pass);
+
+   AlgorithmIdentifier pbe_algid(pbe->get_oid(), pbe->encode_params());
+
+   Pipe key_encrytor(pbe.release());
+   key_encrytor.process_msg(raw_key);
+
+   SecureVector<byte> enc_key =
+      DER_Encoder()
+         .start_cons(SEQUENCE)
+            .encode(pbe_algid)
+            .encode(key_encrytor.read_all(), OCTET_STRING)
+         .end_cons()
+      .get_contents();
+
+   if(encoding == PEM)
+      pipe.write(PEM_Code::encode(enc_key, "ENCRYPTED PRIVATE KEY"));
+   else
+      pipe.write(enc_key);
+   }
+
+/*
+* PEM encode a PKCS #8 private key
+*/
+std::string PEM_encode(const Private_Key& key)
+   {
+   Pipe pem;
+   pem.start_msg();
+   encode(key, pem, PEM);
+   pem.end_msg();
+   return pem.read_all_as_string();
+   }
+
+/*
+* Encrypt and PEM encode a PKCS #8 private key
+*/
+std::string PEM_encode(const Private_Key& key,
+                       RandomNumberGenerator& rng,
+                       const std::string& pass,
+                       const std::string& pbe_algo)
+   {
+   if(pass == "")
+      return PEM_encode(key);
+
+   Pipe pem;
+   pem.start_msg();
+   encrypt_key(key, pem, rng, pass, pbe_algo, PEM);
+   pem.end_msg();
+   return pem.read_all_as_string();
+   }
+
+/*
+* Extract a private key and return it
+*/
+Private_Key* load_key(DataSource& source,
+                      RandomNumberGenerator& rng,
+                      const User_Interface& ui)
+   {
+   AlgorithmIdentifier alg_id;
+   SecureVector<byte> pkcs8_key = PKCS8_decode(source, ui, alg_id);
+
+   const std::string alg_name = OIDS::lookup(alg_id.oid);
+   if(alg_name == "" || alg_name == alg_id.oid.as_string())
+      throw PKCS8_Exception("Unknown algorithm OID: " +
+                            alg_id.oid.as_string());
+
+   std::unique_ptr<Private_Key> key(get_private_key(alg_name));
+
+   if(!key.get())
+      throw PKCS8_Exception("Unknown PK algorithm/OID: " + alg_name + ", " +
+                           alg_id.oid.as_string());
+
+   std::unique_ptr<PKCS8_Decoder> decoder(key->pkcs8_decoder(rng));
+
+   if(!decoder.get())
+      throw Decoding_Error("Key does not support PKCS #8 decoding");
+
+   decoder->alg_id(alg_id);
+   decoder->key_bits(pkcs8_key);
+
+   return key.release();
+   }
+
+/*
+* Extract a private key and return it
+*/
+Private_Key* load_key(const std::string& fsname,
+                      RandomNumberGenerator& rng,
+                      const User_Interface& ui)
+   {
+   DataSource_Stream source(fsname, true);
+   return PKCS8::load_key(source, rng, ui);
+   }
+
+/*
+* Extract a private key and return it
+*/
+Private_Key* load_key(DataSource& source,
+                      RandomNumberGenerator& rng,
+                      const std::string& pass)
+   {
+   return PKCS8::load_key(source, rng, User_Interface(pass));
+   }
+
+/*
+* Extract a private key and return it
+*/
+Private_Key* load_key(const std::string& fsname,
+                      RandomNumberGenerator& rng,
+                      const std::string& pass)
+   {
+   return PKCS8::load_key(fsname, rng, User_Interface(pass));
+   }
+
+/*
+* Make a copy of this private key
+*/
+Private_Key* copy_key(const Private_Key& key,
+                      RandomNumberGenerator& rng)
+   {
+   Pipe bits;
+
+   bits.start_msg();
+   PKCS8::encode(key, bits);
+   bits.end_msg();
+
+   DataSource_Memory source(bits.read_all());
+   return PKCS8::load_key(source, rng);
+   }
+
+}
+
+}