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- #include "Decryptor.h"
- #include "sgx_tseal.h"
- #include "sgx_tcrypto.h"
- #include "sgx_dh.h"
- #include "datatypes.h"
- #include "error_codes.h"
- ECDSASignatureBox Decryptor::signatureBox;
- HybridEncryptionBox Decryptor::hybridEncryptionBoxClient;
- SymmetricEncryptionBox Decryptor::symmetricEncryptionBoxApache;
- SymmetricEncryptionBox Decryptor::symmetricEncryptionBoxVerifier;
- uint8_t Decryptor::verifier_mr_enclave[32] = {0};
- uint8_t Decryptor::apache_mr_signer[32] = {0};
- unsigned int successful_la_count;
- uint8_t Decryptor::plaintext_mitigator_header_H[ECDH_PUBLIC_KEY_SIZE + 32 + 64] = {0};
- uint8_t Decryptor::first_decryption_output[1092] = {0};
- uint8_t Decryptor::plaintext_client_data[1000] = {0};
- // INTERNAL
- uint32_t Decryptor::create_mitigator_token_M(uint8_t* token)
- {
- uint32_t internal_return_status;
- uint32_t counter;
- // create short-term ECDH key pair
- internal_return_status = hybridEncryptionBoxClient.generate_keypair();
- if(internal_return_status != 0)
- return internal_return_status;
- hybridEncryptionBoxClient.get_public_key(token);
- // create token: concatenate short-term keypair with verifiers mrenclave.
- for(counter=0;counter<32;counter++)
- *(token + counter + ECDH_PUBLIC_KEY_SIZE) = verifier_mr_enclave[counter];
- return 0;
- }
- // INTERNAL
- uint32_t Decryptor::create_mitigator_header_H(uint8_t* signature_data_and_signature)
- {
- uint32_t internal_return_status;
- uint8_t local_signature_data_and_signature[ECDH_PUBLIC_KEY_SIZE + 32 + 64];
- uint32_t counter;
- internal_return_status = Decryptor::create_mitigator_token_M(local_signature_data_and_signature);
- if(internal_return_status != 0x0)
- return internal_return_status;
- internal_return_status = signatureBox.sign(local_signature_data_and_signature, ECDH_PUBLIC_KEY_SIZE + 32, local_signature_data_and_signature + ECDH_PUBLIC_KEY_SIZE + 32);
- if(internal_return_status != 0x0)
- return internal_return_status;
- for(counter=0;counter<ECDH_PUBLIC_KEY_SIZE + 32 + 64;counter++)
- signature_data_and_signature[counter] = local_signature_data_and_signature[counter];
- return 0;
- }
- uint32_t Decryptor::create_and_encrypt_mitigator_header_H(uint8_t* ciphertext_token_H_plus_tag, uint32_t* op_length)
- {
- uint32_t temp_ciphertext_token_H_iv_tag_length;
- uint32_t internal_return_status;
- uint8_t plaintext_mitigator_header_H[ECDH_PUBLIC_KEY_SIZE + 32 + 64] = {0x42};
- if(successful_la_count != 2)
- return 0x33;
- internal_return_status = create_mitigator_header_H(plaintext_mitigator_header_H);
- if(internal_return_status != 0)
- return internal_return_status;
- internal_return_status = symmetricEncryptionBoxApache.encrypt_decrypt(1, plaintext_mitigator_header_H, ECDH_PUBLIC_KEY_SIZE + 32 + 64, ciphertext_token_H_plus_tag, &temp_ciphertext_token_H_iv_tag_length);
- *op_length = temp_ciphertext_token_H_iv_tag_length;
- return internal_return_status;
- }
- // INTERNAL. done. But there might be one more return statement for the case when get_keypair returns sth (it is non void).
- uint32_t Decryptor::create_long_term_signing_keypair(uint8_t* private_public_key_string)
- {
- uint32_t internal_return_status;
- internal_return_status = signatureBox.generate_keypair();
- if(internal_return_status != 0)
- return internal_return_status;
- signatureBox.get_keypair(private_public_key_string);
- return 0;
- }
- // INTERNAL.
- // TODO: Edit to process a list of fields.
- uint32_t Decryptor::initialize_symmetric_key_decrypt_client_data(uint8_t* plaintext_client_public_key_plus_encrypted_data_plus_tag, uint32_t total_length, uint8_t* plaintext_client_data, uint32_t* plaintext_client_data_length)
- {
- uint8_t* ciphertext_plus_tag;
- uint32_t ciphertext_plus_tag_length;
- uint32_t internal_return_status;
- // I will derive a shared key from the plaintext_client_public_key
- internal_return_status = hybridEncryptionBoxClient.initialize_symmetric_key(plaintext_client_public_key_plus_encrypted_data_plus_tag);
- if(internal_return_status != 0)
- return internal_return_status;
- // and then I will decrypt the rest of the client data with that key.
- ciphertext_plus_tag = plaintext_client_public_key_plus_encrypted_data_plus_tag + ECDH_PUBLIC_KEY_SIZE;
- ciphertext_plus_tag_length = total_length - ECDH_PUBLIC_KEY_SIZE;
- internal_return_status = hybridEncryptionBoxClient.encrypt_decrypt(0, ciphertext_plus_tag, ciphertext_plus_tag_length, plaintext_client_data, plaintext_client_data_length);
- return internal_return_status;
- }
- void Decryptor::testing_long_term_verification_key(uint8_t* output)
- {
- uint8_t keypair[ECDH_PUBLIC_KEY_SIZE + ECDH_PRIVATE_KEY_SIZE];
- uint32_t counter;
- signatureBox.get_keypair(keypair);
- for(counter=0;counter<ECDH_PUBLIC_KEY_SIZE; counter++)
- output[counter]=keypair[ECDH_PRIVATE_KEY_SIZE+counter];
- }
- // EXTERNAL. DONE.
- uint32_t Decryptor::create_and_seal_long_term_signing_key_pair(uint32_t* sealed_data_length, uint8_t* sealed_data)
- {
- uint32_t sgx_libcall_status;
- uint32_t internal_return_status;
- uint32_t temp_sealed_data_length;
- uint8_t* temp_sealed_data;
- uint8_t private_public_key_string[ECDH_PUBLIC_KEY_SIZE + ECDH_PRIVATE_KEY_SIZE];
- uint32_t counter;
- temp_sealed_data_length = sgx_calc_sealed_data_size(0, ECDH_PUBLIC_KEY_SIZE + ECDH_PRIVATE_KEY_SIZE);
- if(temp_sealed_data_length == 0xFFFFFFFF)
- return 0x01;
- temp_sealed_data = (uint8_t*) malloc(temp_sealed_data_length);
- internal_return_status = create_long_term_signing_keypair(private_public_key_string);
- if(internal_return_status != 0)
- {
- free(temp_sealed_data);
- return internal_return_status;
- }
- sgx_libcall_status = sgx_seal_data(0, NULL, 3*SGX_ECP256_KEY_SIZE, private_public_key_string, temp_sealed_data_length, (sgx_sealed_data_t*) temp_sealed_data);
- if(sgx_libcall_status != SGX_SUCCESS)
- {
- free(temp_sealed_data);
- return sgx_libcall_status;
- }
- for(counter=0;counter<temp_sealed_data_length;counter++)
- *(sealed_data + counter)= *(temp_sealed_data + counter);
- *sealed_data_length = temp_sealed_data_length;
- free(temp_sealed_data);
- return 0;
- }
- // EXTERNAL. DONE.
- uint32_t Decryptor::unseal_and_restore_long_term_signing_key_pair(uint8_t* sealed_data, uint32_t* sgx_sealed_data_length)
- {
- uint32_t temp_plaintext_length;
- uint8_t* temp_plaintext;
- uint32_t counter;
- uint32_t ret_status;
- uint8_t* temp_sealed_data ;
- temp_sealed_data = (uint8_t*) malloc(*sgx_sealed_data_length);
- for(counter=0;counter<*sgx_sealed_data_length;counter++)
- *(temp_sealed_data+counter)=*(sealed_data+counter);
- temp_plaintext_length = sgx_get_encrypt_txt_len((sgx_sealed_data_t*)sealed_data);
- if(temp_plaintext_length == 0xffffffff)
- return 0xFFFFFFFF;
- temp_plaintext = (uint8_t*)malloc( temp_plaintext_length );
- ret_status = sgx_unseal_data((sgx_sealed_data_t*)temp_sealed_data, NULL, 0, temp_plaintext, &temp_plaintext_length);
- free(temp_sealed_data);
- if(ret_status != SGX_SUCCESS)
- {
- free(temp_plaintext);
- return ret_status;
- }
- signatureBox.set_private_public_key(temp_plaintext, temp_plaintext + ECDH_PRIVATE_KEY_SIZE);
- free(temp_plaintext);
- return 0;
- }
- uint32_t Decryptor::process_verifiers_message(uint8_t* input_ciphertext_plus_tag, uint32_t length)
- {
- uint8_t first_decryption_output[150];
- uint32_t first_decryption_output_length;
- uint32_t internal_return_status;
- uint32_t counter;
- if(successful_la_count != 1) // else, the untrusted application can call this on the first message by apache and cause the verifier to set its mrsigner.
- return 0x23;
- internal_return_status = symmetricEncryptionBoxVerifier.encrypt_decrypt(0, input_ciphertext_plus_tag, length, first_decryption_output, &first_decryption_output_length);
- if(internal_return_status != 0)
- return internal_return_status;
-
- if(first_decryption_output_length != 32)
- return 0x33;
-
- for(counter=0; counter<32; counter++)
- apache_mr_signer[counter] = *(first_decryption_output + counter);
-
-
- return 0;
- }
- uint32_t Decryptor::encrypt_decrypt_fields_list(SymmetricEncryptionBox &symmetricEncryptionBox , uint32_t encrypt_decrypt,
- uint8_t *input_fields_list, uint32_t *input_field_sizes,
- uint32_t no_of_fields,
- uint8_t *output_fields_list,
- uint32_t *output_field_sizes, uint32_t* total_output_length) {
- // Enc-dec loops over no_of_fields.
- uint32_t field_counter, input_byte_accumulator=0, byte_counter, field_size, output_byte_accumulator=0;
- uint8_t* input_field, *output_field;
- uint32_t input_field_length, output_field_length, internal_return_status, counter;
- output_field = output_fields_list;
- for(field_counter=0; field_counter< no_of_fields; field_counter++)
- {
- input_field_length = input_field_sizes[field_counter];
- input_field = input_fields_list + input_byte_accumulator;
- output_field = output_fields_list + output_byte_accumulator;
- internal_return_status = symmetricEncryptionBox.encrypt_decrypt(encrypt_decrypt, input_field, input_field_length, output_field, &output_field_length);
- if(internal_return_status != 0)
- return internal_return_status;
- output_field_sizes[field_counter] = output_field_length;
- input_byte_accumulator += input_field_length;
- output_byte_accumulator += output_field_length;
- }
- *total_output_length = output_byte_accumulator;
- return 0;
- }
- uint32_t Decryptor::decrypt_client_data(uint8_t *input_fields_list, uint32_t *input_field_sizes,
- uint32_t no_of_fields, uint32_t total_input_size,
- uint8_t *output_fields_list,
- uint32_t *output_field_sizes) {
- uint8_t *intermediate_fields_list, *plaintext_fields_list, *temp_output_list;
- uint32_t *intermediate_fields_sizes, *plaintext_fields_sizes, *temp_output_sizes;
- uint32_t internal_return_status, total_intermediate_fields_length;
- uint32_t total_plaintext_fields_length, total_output_fields_length, counter;
- // List of symmetric decryption outputs - will get rid of 12 bytes of IV and 16 bytes of tag.
- intermediate_fields_list = (uint8_t*) malloc(total_input_size ); // - (28 * no_of_fields)
- intermediate_fields_sizes = (uint32_t*) malloc(no_of_fields);
- // Remove outermost layer of decryption, namely the one with the target enclave.
- internal_return_status = encrypt_decrypt_fields_list(symmetricEncryptionBoxApache, 0, input_fields_list,
- input_field_sizes, no_of_fields,
- intermediate_fields_list, intermediate_fields_sizes, &total_intermediate_fields_length);
- if(internal_return_status != 0)
- return internal_return_status;
- // Establish a symmetric encryption key with the client, using the client's public key.
- // TODO: Change this function to take in the key length.
- internal_return_status = hybridEncryptionBoxClient.initialize_symmetric_key(intermediate_fields_list);
- if(internal_return_status != 0)
- return internal_return_status;
- // The public key, which was the first element of the output list above, has been processed.
- // Do not attempt to decrypt it one more time.
- intermediate_fields_list += intermediate_fields_sizes[0];
- intermediate_fields_sizes += 1;
- no_of_fields -= 1;
- total_intermediate_fields_length -= intermediate_fields_sizes[0];
- // Initializing lists for the plaintext data.
- plaintext_fields_list = (uint8_t*) malloc(total_intermediate_fields_length);
- plaintext_fields_sizes = (uint32_t*) malloc(no_of_fields);
- // Obtain plaintext data by decrypting with the above newly-established key with the client.
- internal_return_status = encrypt_decrypt_fields_list(hybridEncryptionBoxClient, 0,
- intermediate_fields_list, intermediate_fields_sizes, no_of_fields,
- plaintext_fields_list, plaintext_fields_sizes, &total_plaintext_fields_length);
- if(internal_return_status != 0)
- return internal_return_status;
- temp_output_list = (uint8_t*) malloc(total_input_size);
- temp_output_sizes = (uint32_t*) malloc(no_of_fields);
- // Finally, encrypt the plaintext back to the target enclave.
- internal_return_status = encrypt_decrypt_fields_list(symmetricEncryptionBoxApache, 1, plaintext_fields_list, plaintext_fields_sizes,
- no_of_fields, temp_output_list, temp_output_sizes, &total_output_fields_length);
- if(internal_return_status != 0)
- return internal_return_status;
- for(counter=0; counter<total_output_fields_length; counter++)
- output_fields_list[counter] = temp_output_list[counter];
- for(counter=0;counter<no_of_fields; counter++)
- output_field_sizes[counter] = temp_output_sizes[counter];
- return 0;
- }
- uint32_t Decryptor::process_apache_message_generate_response(uint8_t* input_ciphertext, uint32_t input_ciphertext_plus_tag_length, uint8_t* output_ciphertext_plus_tag, uint32_t* output_ciphertext_plus_tag_length)
- {
- uint32_t first_decryption_output_length, plaintext_client_data_length;
- uint32_t internal_return_status;
- // TODO: May be have temporary variables for input ciphertext as they can't be passed directly to functions?
- // first, I decrypt the message from the target enclave, to get the client's public key and ciphertext data (and tag and IV)
- internal_return_status = symmetricEncryptionBoxApache.encrypt_decrypt(0, input_ciphertext, input_ciphertext_plus_tag_length, first_decryption_output, &first_decryption_output_length);
- if(internal_return_status != 0)
- return internal_return_status;
-
- // then I obtain the plaintext client data, using the client's public key and own key to ultimately decrypt the client's ciphertext data
- internal_return_status = initialize_symmetric_key_decrypt_client_data(first_decryption_output, first_decryption_output_length, plaintext_client_data, &plaintext_client_data_length);
- if(internal_return_status != 0)
- return internal_return_status;
- // then I will encrypt the plaintext data to the target enclave.
- internal_return_status = symmetricEncryptionBoxApache.encrypt_decrypt(1, plaintext_client_data, plaintext_client_data_length, output_ciphertext_plus_tag, output_ciphertext_plus_tag_length);
- return internal_return_status;
- }
- // INTERNAL.
- uint32_t Decryptor::verify_peer_enclave_trust(uint8_t* given_mr_enclave, uint8_t* given_mr_signer, uint8_t* dhaek)
- {
- uint32_t count;
- uint32_t internal_return_status;
- if(successful_la_count == 0) // verifier enclave
- {
- for(count=0; count<SGX_HASH_SIZE; count++)
- verifier_mr_enclave[count] = given_mr_enclave[count];
- symmetricEncryptionBoxVerifier.set_symmetric_key(dhaek);
- }
- else // apache enclave
- {
- /*
- for(count=0; count<SGX_HASH_SIZE; count++)
- {
- if( given_mr_signer[count] != apache_mr_signer[count] )
- return ENCLAVE_TRUST_ERROR;
- }
- */
- symmetricEncryptionBoxApache.set_symmetric_key(dhaek);
- }
- successful_la_count ++;
- return SGX_SUCCESS;
- }
- void Decryptor::calculate_sealed_keypair_size(uint32_t* output_length)
- {
- *output_length = sgx_calc_sealed_data_size(0, ECDH_PUBLIC_KEY_SIZE + ECDH_PRIVATE_KEY_SIZE);
- }
- void Decryptor::testing_get_verifier_mrenclave_apache_mrsigner(uint8_t* output)
- {
- uint32_t counter;
- for(counter=0; counter<32;counter++)
- {
- output[counter]=verifier_mr_enclave[counter];
- output[counter+32]=apache_mr_signer[counter];
- }
- }
- void Decryptor::testing_get_short_term_public_key(uint8_t* output)
- {
- hybridEncryptionBoxClient.get_public_key(output);
- }
- void Decryptor::testing_get_apache_iv(uint8_t* op)
- {
- // symmetricEncryptionBoxApache.get_iv(op);
- }
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