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CHANGE: crypt port (work in progress)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /*********************************************************************** | ||
| ** | ||
| ** REBOL [R3] Language Interpreter and Run-time Environment | ||
| ** | ||
| ** Copyright 2012 REBOL Technologies | ||
| ** Copyright 2012-2021 Rebol Open Source Contributors | ||
| ** REBOL is a trademark of REBOL Technologies | ||
| ** | ||
| ** 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. | ||
| ** | ||
| ************************************************************************ | ||
| ** | ||
| ** Module: n-crypt-aes.c | ||
| ** Summary: native functions for old AES code | ||
| ** Section: natives | ||
| ** Author: Oldes, Cyphre | ||
| ** Notes: | ||
| ** | ||
| ***********************************************************************/ | ||
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| #include "sys-core.h" | ||
| #include "sys-aes.h" | ||
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| /*********************************************************************** | ||
| ** | ||
| */ REBNATIVE(aes) | ||
| /* | ||
| // aes: native [ | ||
| // "Encrypt/decrypt data using AES algorithm. Returns stream cipher context handle or encrypted/decrypted data." | ||
| // /key "Provided only for the first time to get stream HANDLE!" | ||
| // crypt-key [binary!] "Crypt key (16 or 32 bytes)." | ||
| // iv [none! binary!] "Optional initialization vector (16 bytes)." | ||
| // /decrypt "Use the crypt-key for decryption (default is to encrypt)" | ||
| // /stream | ||
| // ctx [handle!] "Stream cipher context." | ||
| // data [binary!] "Data to encrypt/decrypt." | ||
| // ] | ||
| ***********************************************************************/ | ||
| { | ||
| REBOOL ref_key = D_REF(1); | ||
| REBVAL *val_crypt_key = D_ARG(2); | ||
| REBVAL *val_iv = D_ARG(3); | ||
| REBOOL ref_decrypt = D_REF(4); | ||
| REBOOL ref_stream = D_REF(5); | ||
| REBVAL *val_ctx = D_ARG(6); | ||
| REBVAL *val_data = D_ARG(7); | ||
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| REBVAL *ret = D_RET; | ||
| REBINT len, pad_len; | ||
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| //TODO: could be optimized by reusing the handle | ||
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| if (ref_key) { | ||
| //key defined - setup new context | ||
|
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| uint8_t iv[AES_IV_SIZE]; | ||
|
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| if (IS_BINARY(val_iv)) { | ||
| if (VAL_LEN(val_iv) < AES_IV_SIZE) { | ||
| return R_NONE; | ||
| } | ||
| memcpy(iv, VAL_BIN_AT(val_iv), AES_IV_SIZE); | ||
| } else { | ||
| //TODO: Use ECB encryption if IV is not specified | ||
| memset(iv, 0, AES_IV_SIZE); | ||
| } | ||
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| len = VAL_LEN(val_crypt_key) << 3; | ||
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| if (len != 128 && len != 256) { | ||
| return R_NONE; | ||
| } | ||
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| MAKE_HANDLE(ret, SYM_AES); | ||
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| AES_set_key( | ||
| (AES_CTX*)VAL_HANDLE_CONTEXT_DATA(ret), | ||
| VAL_BIN_AT(val_crypt_key), | ||
| (const uint8_t *)iv, | ||
| (len == 128) ? AES_MODE_128 : AES_MODE_256 | ||
| ); | ||
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| if (ref_decrypt) AES_convert_key((AES_CTX*)VAL_HANDLE_CONTEXT_DATA(ret)); | ||
|
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| } else if(ref_stream) { | ||
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| if (NOT_VALID_CONTEXT_HANDLE(val_ctx, SYM_AES)) { | ||
| Trap0(RE_INVALID_HANDLE); | ||
| return R_NONE; | ||
| } | ||
| AES_CTX *aes_ctx = (AES_CTX *)VAL_HANDLE_CONTEXT_DATA(val_ctx); | ||
|
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| len = VAL_LEN(val_data); | ||
| if (len == 0) return R_NONE; | ||
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| pad_len = (((len - 1) >> 4) << 4) + AES_BLOCKSIZE; | ||
|
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| REBYTE *data = VAL_BIN_AT(val_data); | ||
| REBYTE *pad_data; | ||
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| if (len < pad_len) { | ||
| // make new data input with zero-padding | ||
| //TODO: instead of making new data, the original could be extended with padding. | ||
| pad_data = (REBYTE*)MAKE_MEM(pad_len); | ||
| memset(pad_data, 0, pad_len); | ||
| memcpy(pad_data, data, len); | ||
| data = pad_data; | ||
| } | ||
| else { | ||
| pad_data = NULL; | ||
| } | ||
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| REBSER *binaryOut = Make_Binary(pad_len); | ||
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| if (aes_ctx->key_mode == AES_MODE_DECRYPT) { | ||
| AES_cbc_decrypt(aes_ctx, data, BIN_HEAD(binaryOut), pad_len); | ||
| } | ||
| else { | ||
| AES_cbc_encrypt(aes_ctx, data, BIN_HEAD(binaryOut), pad_len); | ||
| } | ||
| if (pad_data) FREE_MEM(pad_data); | ||
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| SET_BINARY(ret, binaryOut); | ||
| VAL_TAIL(ret) = pad_len; | ||
|
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| } | ||
| return R_RET; | ||
| } |
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