\/\/ dec_evp.c
\/\/
\/\/ Copyright 2009 Kim Sung-tae <pchero21@gmail.com>
\/\/
\/\/ This program is free software; you can redistribute it and\/or modify
\/\/ it under the terms of the GNU General Public License as published by
\/\/ the Free Software Foundation; either version 2 of the License, or
\/\/ (at your option) any later version.
\/\/
\/\/ This program is distributed in the hope that it will be useful,
\/\/ but WITHOUT ANY WARRANTY; without even the implied warranty of
\/\/ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\/\/ GNU General Public License for more details.
\/\/
\/\/ You should have received a copy of the GNU General Public License
\/\/ along with this program; if not, write to the Free Software
\/\/ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
\/\/ MA 02110-1301, USA.<\/p>\n
#include <stdio.h>
#include <openssl\/bio.h>
#include <openssl\/err.h>
#include <openssl\/bn.h>
#include <openssl\/dh.h>
#include <openssl\/x509.h>
#include <openssl\/rand.h>
#include <openssl\/pem.h><\/p>\n
#define IN_FILE “encrypt.txt”
#define OUT_FILE “decrypt.txt”<\/p>\n
unsigned char* readFile(char *file, int *readLen);
unsigned char* readFileBio(BIO *fileBIO, int *readLen);
unsigned char* addString(unsigned char *destString, int destLen, const unsigned char *addString, int addLen);<\/p>\n
int main(int argc, char** argv)
{
\/\/ \ud0a4\uc640 IV \uac12\uc740 \uc9c1\uc811 \ub9cc\ub4e0
unsigned char key[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
unsigned char iv[] = {1, 2, 3, 4, 5, 6, 7, 8};
unsigned char* outbuf; \/\/ \ubcf5\ud638\ubb38\uc774 \uc800\uc7a5\ub420 \ubc84\ud37c
int outlen, tmplen;
BIO *errBIO = NULL;
BIO *outBIO = NULL;
\/\/ \uc5d0\ub7ec \ubc1c\uc0dd\uc758 \uacbd\uc6b0 \ud574\ub2f9 \uc5d0\ub7ec \uc2a4\ud2b8\ub9c1 \ucd9c\ub825\uc744 \uc704\ud574 \ubbf8\ub9ac \uc5d0\ub7ec \uc2a4\ud2b8\ub9c1\ub4e4\uc744 \ub85c\ub529.
ERR_load_crypto_strings();
\/\/ \ud45c\ub454 \ud654\uba74 \ucd9c\ub825 BIO \uc0dd\uc131
if((errBIO = BIO_new(BIO_s_file())) != NULL)
BIO_set_fp(errBIO, stderr, BIO_NOCLOSE | BIO_FP_TEXT);
\/\/ \ud30c\uc77c \ucd9c\ub825 BIO \uc0dd\uc131
outBIO = BIO_new_file(OUT_FILE, “wb”);
if(!outBIO) { \/\/ \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud55c \uacbd\uc6b0
BIO_printf(errBIO, “\ud30c\uc77c [%s]\uc744 \uc0dd\uc131\ud558\ub294\ub370 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd \ud588\uc2b5\ub2c8\ub2e4.”, OUT_FILE);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \ud30c\uc77c\uc5d0\uc11c \uc77d\uc5b4\uc624\uae30
int len;
unsigned char* readBuffer = readFile(IN_FILE, &len);
\/\/ \uc554\ud638\ud654 \ucee8\ud14d\uc2a4\ud2b8 EVP_CIPHER_CTX \uc0dd\uc131, \ucd08\uae30\ud654
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
\/\/ \ucd08\uae30\ud654
EVP_DecryptInit_ex(&ctx, EVP_bf_cbc(), NULL, key, iv);
\/\/ \ucd08\uae30\ud654\uac00 \ub05d\ub09c\ud6c4\uc5d0 \ud574\uc57c \ud55c\ub2e4. \ubcf5\ud638\ubb38 \uc800\uc7a5\ud560 \ubc84\ud37c \uc0dd\uc131
outbuf = (unsigned char*)malloc(sizeof(unsigned char) * len);
\/\/ \uc5c5\ub370\uc774\ud2b8, \ub9c8\uc9c0\ub9c9 \ube14\ub85d\uc744 \uc81c\uc678\ud558\uace0 \ubaa8\ub450 \ubcf5\ud638\ud654
if(!EVP_DecryptUpdate(&ctx, outbuf, &outlen, readBuffer, len)) {
return 0;
}
\/\/ \uc885\ub8cc. \ub9c8\uc9c0\ub9c9 \ube14\ub85d\uc744 \ubcf5\ud638\ud654
if(!EVP_DecryptFinal_ex(&ctx, outbuf + outlen, &tmplen)) {
return 0;
}
\/\/ \ubcf5\ud638\ubb38 \uae38\uc774\ub294 \uc5c5\ub370\uc774\ud2b8, \uc885\ub8cc \uacfc\uc815\uc5d0\uc11c \ub098\uc628 \uacb0\uacfc\uc758 \ud569
outlen += tmplen;
EVP_CIPHER_CTX_cleanup(&ctx);
BIO_printf(errBIO, “\ubcf5\ud638\ud654\uac00 \uc644\ub8cc\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \ubcf5\ud638\ubb38\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.nn”);
outbuf[outlen] = 0;
printf(“%s”, outbuf);
\/\/ \ud30c\uc77c\uc5d0 \uac19\uc740 \ub0b4\uc6a9\uc744 \ucd9c\ub825\ud55c\ub2e4.
BIO_write(outBIO, outbuf, outlen);<\/p>\n
\/\/ \uac1d\uccb4 \uc81c\uac70
BIO_free(outBIO);
return 0;
}<\/p>\n
unsigned char* readFile(char *file, int *readLen)
{
unsigned char *retBuffer = NULL;
unsigned char *buffer = NULL;
int length = 0;
\/\/ \ud30c\uc77c BIO \uc815\uc758
BIO *fileBIO = NULL;
\/\/ \uc778\uc790\ub85c \ub118\uc5b4\uc628 \ud30c\uc77c\uc744 \uc5f4\uace0, \ud30c\uc77c BIO \uc0dd\uc131
fileBIO = BIO_new_file(file, “rb”);
if(!fileBIO) { \/\/ \ud30c\uc77c\uc744 \uc5ec\ub294\ub370 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud55c \uacbd\uc6b0
printf(“\uc785\ub825 \ud30c\uc77c [%s] \uc744 \uc5ec\ub294\ub370 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd \ud588\uc2b5\ub2c8\ub2e4.n”, file);
exit(1);
}
\/\/ \uc784\uc2dc\ub85c 1000 \ubc14\uc774\ud2b8 \ub9cc\ud07c\uc758 \uc77d\uc740 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud560 \ubc84\ud37c \uc0dd\uc131
buffer = (unsigned char*)malloc(1001);
*readLen = 0;
while(1) {
\/\/ \ud30c\uc77c BIO\uc5d0\uc11c 1000 \ubc14\uc774\ud2b8 \ub9cc\ud07c \uc77d\uc5b4\uc11c buffer\uc5d0 \uc800\uc7a5\ud55c\ub2e4.
length = BIO_read(fileBIO, buffer, 1000);
\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub05d\uc740 NULL\ub85c \ucc44\uc6b4\ub2e4.
buffer[length] = 0;
\/\/ \uc784\uc2dc\ub85c \uc77d\uc740 1000\ubc14\uc774\ud2b8\uc758 \ub370\uc774\ud130\ub97c \ub9ac\ud134 \ubc84\ud37c\uc5d0 \ub354\ud55c\ub2e4.
retBuffer = addString(retBuffer, *readLen, buffer, length);
\/\/ \uc9c0\uae08\uae4c\uc9c0 \uc77d\uc740 \ub370\uc774\ud130\uc758 \uae38\uc774\ub97c \ub354\ud55c\ub2e4.
*readLen = *readLen + length;
\/\/ \ub9cc\uc57d \uc9c0\uae08 \ud30c\uc77c\uc5d0\uc11c \uc77d\uc740 \ub370\uc774\ud130\uc758 \uae38\uc774\uac00 \uaf2d 1000 \ubc14\uc774\ud2b8\ub77c\uba74 \uc55e\uc73c\ub85c \ub354 \uc77d\uc744
\/\/ \ub370\uc774\ud130\uac00 \uc5c6\uc744 \uac83\uc774\ub2e4. \ud558\uc9c0\ub9cc 1000 \ubc14\uc774\ud2b8\ubcf4\ub2e4 \uc791\ub2e4\uba74 \ub354 \uc774\uc0c1 \uc77d\uc744 \ub370\uc774\ud130\uac00
\/\/ \uc5c6\uc744 \uac83\uc774\ubbc0\ub85c \uc885\ub8cc\ud55c\ub2e4.
if(length == 1000)
\/\/ \ud30c\uc77c \ud3ec\uc778\ud130\ub97c 1000 \ubc14\uc774\ud2b8 \ub4a4\ub85c \uc62e\uae34\ub2e4.
BIO_seek(fileBIO, 1000);
else
break;
}
\/\/ \uac1d\uccb4 \uc0ad\uc81c
BIO_free(fileBIO);
free(buffer);
return retBuffer;
}<\/p>\n
unsigned char* readFileBio(BIO *fileBIO, int *readLen)
{
unsigned char* retBuffer = NULL;
\/\/ \uc784\uc2dc\ub85c 1000\ubc14\uc774\ud2b8 \ub9cc\ud07c\uc758 \uc77d\uc740 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud560 \ubc84\ud37c \uc0dd\uc131
unsigned char* buffer = (unsigned char*)malloc(1001);
int length = 0;
*readLen = 0;
while(1) {
\/\/ \ud30c\uc77c BIO\uc5d0\uc11c 1000\ubc14\uc774\ud2b8 \ub9cc\ud07c \uc77d\uc5b4\uc11c buffer\uc5d0 \uc800\uc7a5\ud55c\ub2e4.
length = BIO_read(fileBIO, buffer, 1000);
\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub05d\uc740 NULL\ub85c \ucc44\uc6b4\ub2e4
buffer[length] = 0;
\/\/ \uc784\uc2dc\ub85c \uc77d\uc740 1000\ubc14\uc774\ud2b8\uc758 \ub370\uc774\ud130 \ub9ac\ud134 \ubc84\ud37c\uc5d0 \ub354\ud55c\ub2e4.
retBuffer = addString(retBuffer, *readLen, buffer, length);
\/\/ \uc9c0\uae08\uae4c\uc9c0 \uc77d\uc740 \ub370\uc774\ud130\uc758 \uae38\uc774\ub97c \ub354\ud55c\ub2e4.
*readLen = *readLen + length;
\/\/ \ub9cc\uc57d \uc9c0\uae08 \ud30c\uc77c\uc5d0\uc11c \uc77d\uc740 \ub370\uc774\ud130\uc758 \uae38\uc774\uac00 \uaf2d 1000 \ubc14\uc774\ud2b8\ub77c\uba74 \uc55e\uc73c\ub85c \ub354 \uc77d\uc744
\/\/ \ub370\uc774\ud130\uac00 \uc788\uc744 \uac83\uc774\ub2e4. \ud558\uc9c0\ub9cc 1000 \ubc14\uc774\ud2b8\ubcf4\ub2e4 \uc791\ub2e4\uba74 \ub354 \uc774\uc0c1 \uc77d\uc744 \ub370\uc774\ud130\uac00
\/\/ \uc5c6\uc744 \uac83\uc774\ubbc0\ub85c \uc885\ub8cc \ud55c\ub2e4.
if(length == 1000)
\/\/ \ud30c\uc77c \ud3ec\uc778\ud130\ub97c 1000\ubc14\uc774\ud2b8 \ub4a4\ub85c \uc62e\uae34\ub2e4.
BIO_seek(fileBIO, 1000);
else
break;
}
return retBuffer;
}<\/p>\n
unsigned char* addString(unsigned char *destString, int destLen, const unsigned char *addString, int addLen)
{
\/\/ \ub9ac\ud134 \ud560 \ubc84\ud37c \uc815\uc758
unsigned char *retString;
int i;
\/\/ \ub9cc\uc57d \ub367\ubd99\uc77c \ub300\uc0c1 \ubc84\ud37c\uac00 NULL, \uc774\uac70\ub098 \uae38\uc774\uac00 0\uc774\uba74 \ub367\ubd99\uc77c \ub300\uc0c1\ubc84\ud37c\uac00 \uc5c6\ub294 \uacbd\uc6b0
\/\/ \uc774\ubbc0\ub85c \uc0c8\ub85c \uc0dd\uc131\ud558\uace0, \ub367\ubd99\uc77c \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \ubcf5\uc0ac\ud55c\ub2e4.
if((destString == NULL) || (destLen == 0)) {
\/\/ \ub367\ubd99\uc77c \ubc84\ud37c\uc758 \uae38\uc774 \ub9cc\ud07c\uc758 \ubc84\ud37c \uc0dd\uc131
retString = (unsigned char*)malloc(sizeof(unsigned char) * (addLen + 1));
\/\/ \ub367\ubd99\uc77c \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \uc0c8\ub85c\uc6b4 \ubc84\ud37c\uc5d0 \ubcf5\uc0ac
for(i = 0; i < addLen; i++) {
retString[i] = addString[i];
}
\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub9c8\uc9c0\ub9c9\uc5d0 NULL \ubc14\uc774\ud2b8\ub97c \ubd99\uc778\ub2e4.
retString[i] = NULL;
}
else { \/\/ \ub367\ubd99\uc77c \ub300\uc0c1 \ubc84\ud37c\uac00 \uc788\ub294 \uacbd\uc6b0 \uc774\ubbc0\ub85c \ub300\uc0c1 \ubc84\ud37c\uc758 \uae38\uc774\uc640 \ub367\ubd99\uc77c \ubc84\ud37c\uc758 \uae38\uc774\ub97c
\/\/ \ub354\ud55c \ub9cc\ud07c\uc758 \ubc84\ud37c\ub97c \uc0c8\ub85c \uc0dd\uc131\ud558\uace0, \ub450 \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \uc0c8\ub85c\uc6b4 \ubc84\ud130\uc5d0 \ubcf5\uc0ac\ud55c\ub2e4.
retString = (unsigned char*)malloc(sizeof(unsigned char) * (destLen + addLen + 1));
\/\/ \ub367\ubd99\uc77c \ub300\uc0c1 \ubc84\ud37c \ub0b4\uc6a9\uc744 \uc0c8\ub85c\uc6b4 \ubc84\ud37c\uc5d0 \ubcf5\uc0ac
for(i = 0; i < destLen; i++) {
retString[i] = destString[i];
}
\/\/ \ub367\ubd99\uc77c \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \uc0c8\ub85c\uc6b4 \ubc84\ud37c\uc5d0 \ubcf5\uc0ac
for(i = 0; i < addLen; i++) {
retString[i + destLen] = addString[i];
}
\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub9c8\uc9c0\ub9c9\uc5d0 NULL \ubc14\uc774\ud2b8\ub97c \ubd99\uc778\ub2e4.
retString[i + destLen] = NULL;
}
\/\/ \uba54\ubaa8\ub9ac\uc5d0\uc11c \uc0ad\uc81c
free(destString);
return retString;
}<\/p>\n","protected":false},"excerpt":{"rendered":"
\/\/ dec_evp.c\/\/ \/\/ Copyright 2009 Kim Sung-tae <pchero21@gmail.com>\/\/ \/\/ This program is free software; you can redistribute it and\/or modify\/\/ it under the terms of the GNU General … Continue reading