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pg_themis.c
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pg_themis.c
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/*
Copyright (c) 2016 Cossack Labs Limited
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "postgres.h"
#include "fmgr.h"
#include <stdlib.h>
#include <themis/themis.h>
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(pg_themis_scell_encrypt_seal);
PG_FUNCTION_INFO_V1(pg_themis_scell_decrypt_seal);
PG_FUNCTION_INFO_V1(pg_themis_smessage_encrypt);
PG_FUNCTION_INFO_V1(pg_themis_smessage_decrypt);
Datum pg_themis_scell_encrypt_seal(PG_FUNCTION_ARGS){
bytea* data = PG_GETARG_BYTEA_P(0);
bytea* key = PG_GETARG_BYTEA_P(1);
size_t encrypted_data_len=0;
bytea* encrypted_data=NULL;
if(THEMIS_BUFFER_TOO_SMALL!=themis_secure_cell_encrypt_seal((const uint8_t*)VARDATA(key), VARSIZE(key)-VARHDRSZ, NULL, 0, (const uint8_t*)VARDATA(data), VARSIZE(data)-VARHDRSZ, NULL, &encrypted_data_len)){
ereport(ERROR,(errcode(-1), errmsg("ERR secure seal encription failed"), errdetail("length determination"), NULL));
}
encrypted_data = palloc(encrypted_data_len+VARHDRSZ);
if(!encrypted_data){
ereport(ERROR,(errcode(-1), errmsg("ERR allocation error"), NULL, NULL));
}
SET_VARSIZE(encrypted_data, encrypted_data_len+VARHDRSZ);
if(THEMIS_SUCCESS!=themis_secure_cell_encrypt_seal((const uint8_t*)VARDATA(key), VARSIZE(key)-VARHDRSZ, NULL, 0, (const uint8_t*)VARDATA(data), VARSIZE(data)-VARHDRSZ, (uint8_t*)VARDATA(encrypted_data), &encrypted_data_len)){
pfree(encrypted_data);
ereport(ERROR,(errcode(-1), errmsg("ERR secure seal encription failed"), NULL, NULL));
}
PG_RETURN_BYTEA_P(encrypted_data);
}
Datum pg_themis_scell_decrypt_seal(PG_FUNCTION_ARGS){
bytea* data = PG_GETARG_BYTEA_P(0);
bytea* key = PG_GETARG_BYTEA_P(1);
size_t decrypted_data_len=0;
bytea* decrypted_data=NULL;
if(THEMIS_BUFFER_TOO_SMALL!=themis_secure_cell_decrypt_seal((const uint8_t*)VARDATA(key), VARSIZE(key)-VARHDRSZ, NULL, 0, (const uint8_t*)VARDATA(data), VARSIZE(data)-VARHDRSZ, NULL, &decrypted_data_len)){
ereport(ERROR,(errcode(-1), errmsg("ERR secure seal decription failed"), errdetail("length determination"), NULL));
}
decrypted_data = palloc(decrypted_data_len+VARHDRSZ);
if(!decrypted_data){
ereport(ERROR,(errcode(-1), errmsg("ERR allocation error"), NULL, NULL));
}
SET_VARSIZE(decrypted_data, decrypted_data_len+VARHDRSZ);
if(THEMIS_SUCCESS!=themis_secure_cell_decrypt_seal((const uint8_t*)VARDATA(key), VARSIZE(key)-VARHDRSZ, NULL, 0, (const uint8_t*)VARDATA(data), VARSIZE(data)-VARHDRSZ, (uint8_t*)VARDATA(decrypted_data), &decrypted_data_len)){
pfree(decrypted_data);
ereport(ERROR,(errcode(-1), errmsg("ERR secure seal decription failed"), NULL, NULL));
}
PG_RETURN_BYTEA_P(decrypted_data);
}
//encrypt data with acra ctruct
static int smessage_encrypt(const uint8_t* data, const uint32_t data_length, const uint8_t* private_key, const uint32_t private_key_length, const uint8_t* public_key, const uint32_t public_key_length, const uint8_t* peer_public_key, const uint32_t peer_public_key_length, bytea** enc_data){
size_t encrypted_data_len=0;
if(THEMIS_BUFFER_TOO_SMALL!=themis_secure_message_wrap(private_key, private_key_length, peer_public_key, peer_public_key_length, data, data_length, NULL, &encrypted_data_len)){
return -1;
}
*enc_data = palloc(public_key_length+sizeof(uint32_t)+encrypted_data_len+VARHDRSZ);
if(!(*enc_data)){
return -2;
}
memcpy((uint8_t*)VARDATA(*enc_data), &public_key_length, sizeof(public_key_length));
memcpy((uint8_t*)VARDATA(*enc_data)+sizeof(public_key_length), public_key, public_key_length);
if(THEMIS_SUCCESS!=themis_secure_message_wrap(private_key, private_key_length, peer_public_key, peer_public_key_length, data, data_length, (uint8_t*)VARDATA(*enc_data)+sizeof(public_key_length)+public_key_length, &encrypted_data_len)){
pfree(*enc_data);
return -1;
}
encrypted_data_len+=sizeof(public_key_length)+public_key_length;
SET_VARSIZE(*enc_data, encrypted_data_len+VARHDRSZ);
return 0;
}
//decrypt acra structed data
static int smessage_decrypt(const uint8_t* data, const uint32_t data_length, const uint8_t* private_key, const uint32_t private_key_length, bytea** dec_data){
size_t decrypted_data_len=0;
const uint32_t public_key_length = *((const uint32_t*)data);
const uint8_t* public_key = data+sizeof(uint32_t);
const uint8_t* data_ = public_key+public_key_length;
size_t data_length_ = data_length-public_key_length-sizeof(uint32_t);
if(data_length<=public_key_length+sizeof(uint32_t)){
return -1;
}
if(THEMIS_BUFFER_TOO_SMALL!=themis_secure_message_unwrap(private_key, private_key_length, public_key, public_key_length, data_, data_length_, NULL, &decrypted_data_len)){
return -1;
}
*dec_data = palloc(decrypted_data_len+VARHDRSZ);
if(!(*dec_data)){
return -2;
}
if(THEMIS_SUCCESS!=themis_secure_message_unwrap(private_key, private_key_length, public_key, public_key_length, data_, data_length_, (uint8_t*)VARDATA(*dec_data), &decrypted_data_len)){
pfree(*dec_data);
return -1;
}
SET_VARSIZE(*dec_data, decrypted_data_len+VARHDRSZ);
return 0;
}
static int smessage_enc(const uint8_t* public_key, const uint32_t public_key_length, const uint8_t* data, const uint8_t data_length, bytea** enc_data){
uint8_t new_private_key[10240];
uint8_t new_public_key[10240];
size_t new_private_key_length=10240, new_public_key_length=10240;
if(THEMIS_SUCCESS!=themis_gen_ec_key_pair(new_private_key, &new_private_key_length, new_public_key, &new_public_key_length)){
return -1;
}
return smessage_encrypt(data, data_length, new_private_key, new_private_key_length, new_public_key, new_public_key_length, public_key, public_key_length, enc_data);
}
static int smessage_dec(const uint8_t* private_key, const uint32_t private_key_length, const uint8_t* data, const uint8_t data_length, bytea** dec_data){
return smessage_decrypt(data, data_length, private_key, private_key_length, dec_data);
}
Datum pg_themis_smessage_encrypt(PG_FUNCTION_ARGS){
bytea* data = PG_GETARG_BYTEA_P(0);
bytea* key = PG_GETARG_BYTEA_P(1);
bytea* encrypted_data=NULL;
if(0!=smessage_enc((const uint8_t*)VARDATA(key), VARSIZE(key)-VARHDRSZ, (const uint8_t*)VARDATA(data), VARSIZE(data)-VARHDRSZ, &encrypted_data)){
ereport(ERROR,(errcode(-1), errmsg("ERR secure message encription failed"), NULL, NULL));
}
PG_RETURN_BYTEA_P(encrypted_data);
}
Datum pg_themis_smessage_decrypt(PG_FUNCTION_ARGS){
bytea* data = PG_GETARG_BYTEA_P(0);
bytea* key = PG_GETARG_BYTEA_P(1);
bytea* decrypted_data=NULL;
if(0!=smessage_dec((const uint8_t*)VARDATA(key), VARSIZE(key)-VARHDRSZ, (const uint8_t*)VARDATA(data), VARSIZE(data)-VARHDRSZ, &decrypted_data)){
ereport(ERROR,(errcode(-1), errmsg("ERR secure message decription failed"), NULL, NULL));
}
PG_RETURN_BYTEA_P(decrypted_data);
}