Clean up PK decryption encoding.

Previously RSA and ElGamal stripped off leading zeros which were then
assumed by the padding decoders. Instead have them produce ciphertexts
with leading zeros. Changes EME_Raw to strip leading zeros to match
existing behavior.

1 files changed, 1 insertions, 6 deletions

diff --git a/src/lib/pubkey/pk_ops.cpp b/src/lib/pubkey/pk_ops.cpp
index 37c31777d..654b68255 100644
--- a/src/lib/pubkey/pk_ops.cpp
+++ b/src/lib/pubkey/pk_ops.cpp
@@ -31,12 +31,7 @@ secure_vector<byte> PK_Ops::Encryption_with_EME::encrypt(const byte msg[], size_
                                                          RandomNumberGenerator& rng)
    {
    const size_t max_raw = max_raw_input_bits();
-
    const std::vector<byte> encoded = unlock(m_eme->encode(msg, msg_len, max_raw, rng));
-
-   if(8*(encoded.size() - 1) + high_bit(encoded[0]) > max_raw)
-      throw Exception("Input is too large to encrypt with this key");
-
    return raw_encrypt(encoded.data(), encoded.size(), rng);
    }
 
@@ -60,7 +55,7 @@ PK_Ops::Decryption_with_EME::decrypt(byte& valid_mask,
                                      size_t ciphertext_len)
    {
    const secure_vector<byte> raw = raw_decrypt(ciphertext, ciphertext_len);
-   return m_eme->unpad(valid_mask, raw.data(), raw.size(), max_raw_input_bits());
+   return m_eme->unpad(valid_mask, raw.data(), raw.size());
    }
 
 PK_Ops::Key_Agreement_with_KDF::Key_Agreement_with_KDF(const std::string& kdf)