\n
\n#include <stdio.h>
#include <string.h>
#include <openssl\/bio.h>
#include <openssl\/err.h>
#include <openssl\/bn.h>
#include <openssl\/dh.h>
#include <openssl\/rand.h>
#include <openssl\/pem.h><\/P>
\n<\/P>
\n#define IN_FILE “.\/plain.txt” \/\/ plain file
#define OUT_FILE “.\/encrypt.txt” \/\/ cipher file<\/P>
\n<\/P>
\nunsigned 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<\/P>
\nint main(int argc, char* argv[])
{
\/\/ \ud0a4\uc640 IV\uac12\uc740 \ud3b8\uc758\ub97c \uc704\ud574 \uc9c1\uc811 \ub9cc\ub4e0\ub2e4.<\/P>
\nunsigned 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};<\/P>
\nint len;
unsigned char *readBuffer, *outbuf;
int outlen, tmplen;<\/P>
\n
BIO *errBIO = NULL;
BIO *outBIO = NULL;<\/P>
\n<\/P>
\n\/\/ \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();<\/P>
\n<\/P>
\n\/\/ \ud45c\uc900 \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);<\/P>
\n<\/P>
\n\/\/ \ud30c\uc77c \ucd9c\ub825 BIO \uc0dd\uc131
outBIO = BIO_new_file(OUT_FILE, “wb”);
if(!outBIO) {
BIO_printf(errBIO, “Can not create file [%s]!”, OUT_FILE);
ERR_print_errors(errBIO);
exit(1);
}<\/P>
\n<\/P>
\n\/\/ \ud30c\uc77c\uc5d0\uc11c \ub370\uc774\ud130 \uc77d\uc5b4\uc624\uae30
readBuffer = readFile(IN_FILE, &len);<\/P>
\n<\/P>
\n\/\/ \uc554\ud638\ud654 \ucee8\ud14d\uc2a4\ud2b8 EVP_CIPHER_CTX \uc0dd\uc131, \ucd08\uae30\ud654
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);<\/P>
\n<\/P>
\n\/\/ \ucd08\uae30\ud654
EVP_EncryptInit_ex(&ctx, EVP_bf_cbc(), NULL, key, iv);<\/P>
\n<\/P>
\n\/\/ \ucd08\uae30\ud654\uac00 \ub05d\ub09c\ud6c4\uc5d0 \ud574\uc57c \ud55c\ub2e4. \uc554\ud638\ubb38 \uc800\uc7a5\ud560 \ubc84\ud37c \uc0dd\uc131
outbuf = (unsigned char*)malloc(sizeof(unsigned char) * (len + EVP_CIPHER_CTX_block_size(&ctx)));<\/P>
\n<\/P>
\n\/\/ \uc5c5\ub370\uc774\ud2b8. \ub9c8\uc9c0\ub9c9 \ube14\ub85d\uc744 \uc81c\uc678\ud558\uace0 \ubaa8\ub450 \uc554\ud638\ud654.
if(!EVP_EncryptUpdate(&ctx, outbuf, &outlen, readBuffer, strlen((char *)readBuffer))) {
return 0;
}<\/P>
\n<\/P>
\n\/\/ \uc885\ub8cc. \ub9c8\uc9c0\ub9c9 \ube14\ub85d\uc744 \uc554\ud638\ud654
if(!EVP_EncryptFinal_ex(&ctx, outbuf + outlen, &tmplen)) {
return 0;
}<\/P>
\n<\/P>
\n\/\/ \uc554\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);<\/P>
\nBIO_printf(errBIO, “Create Cipher Complete.nSaving [%s] filen”, OUT_FILE);<\/P>
\n<\/P>
\n\/\/ \ud30c\uc77c\uc5d0 \uac19\uc740 \ub0b4\uc6a9\uc744 \ucd9c\ub825\ud55c\ub2e4.
BIO_write(outBIO, outbuf, outlen);<\/P>
\n<\/P>
\n\/\/ \uac1d\uccb4 \uc81c\uac70
BIO_free(outBIO);<\/P>
\n<\/P>
\nreturn 0;
}<\/P>
\n<\/P>
\n<\/P>
\nunsigned char* readFile(char *file, int *readLen)
{
unsigned char *retBuffer = NULL;
unsigned char *buffer = NULL;
int length = 0;<\/P>
\n<\/P>
\n\/\/ \ud30c\uc77c BIO \uc815\uc758
BIO *fileBIO = NULL;<\/P>
\n<\/P>
\n\/\/ \uc778\uc790\ub85c \ub118\uc5b4\uc628 \ud30c\uc77c\uc744 \uc5f4\uace0, \ud30c\uc77c BIO \uc0dd\uc131
fileBIO = BIO_new_file(file, “rb”);
if(!fileBIO) {
printf(“file open(%s) error!n”, file);
exit(1);
}<\/P>
\n<\/P>
\n\/\/ \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;<\/P>
\n<\/P>
\nwhile(1) {<\/P>
\n\/\/ \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);<\/P>
\n<\/P>
\n\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub05d\uc740 NULL\ub85c \ucc44\uc6b4\ub2e4.
buffer[length] = 0;<\/P>
\n<\/P>
\n\/\/ \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);<\/P>
\n<\/P>
\n\/\/ \uc9c0\uae08\uae4c\uc9c0 \uc77d\uc740 \ub370\uc774\ud130\uc758 \uae38\uc774\ub97c \ub354\ud55c\ub2e4.
*readLen = *readLen + length;
<\/P>
\n\/\/ \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<\/P>
\n\/\/ \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<\/P>
\n\/\/ \uc5c6\uc744 \uac83\uc774\ubbc0\ub85c \uc885\ub8cc\ud55c\ub2e4.<\/P>
\nif(length == 1000)<\/P>
\n\/\/ \ud30c\uc77c \ud3ec\uc778\ud130\ub97c 1000 \ubc14\uc774\ud2b8 \ub4a4\ub85c \uc62e\uae34\ub2e4.
BIO_seek(fileBIO, 1000);
else
break;
}<\/P>
\n<\/P>
\n\/\/ \uac1d\uccb4 \uc0ad\uc81c<\/P>
\nBIO_free(fileBIO);<\/P>
\nfree(buffer);<\/P>
\n<\/P>
\nreturn retBuffer;
}<\/P>
\n<\/P>
\n
unsigned char* addString(unsigned char* destString, int destLen, const unsigned char *addString, int addLen)
{<\/P>
\n\/\/ \ub9ac\ud134\ud560 \ubc84\ud37c \uc815\uc758
unsigned char *retString;
int i;<\/P>
\n<\/P>
\n\/\/ \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<\/P>
\n\/\/ \uc774\ubbc0\ub85c \uc0c8\ub85c \uc0dd\uc131\ud558\uace0, \ub367\ubd99\uc77c \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \ubcf5\uc0ac \ud55c\ub2e4.<\/P>
\nif((destString == NULL) || (destLen == 0)) {<\/P>
\n\/\/ \ub367\ubd99\uc77c \ubc84\ud37c \uae38\uc774 \ub9cc\ud07c\uc758 \ubc84\ud37c \uc0dd\uc131
retString = (unsigned char*)malloc(sizeof(unsigned char) * (addLen + 1));<\/P>
\n<\/P>
\n\/\/ \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];
}<\/P>
\n\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub9c8\uc9c0\ub9c9\uc5d0 NULL \ubc14\uc774\ud2b8\ub97c \ubb4d\uc778\ub2e4.
retString[i] = NULL;
}<\/P>
\n\/\/ \ub367\ubd99\uc77c \ub300\uc0c1 \ubc84\ud37c\uac00 \uc788\ub294 \uacbd\uc6b0\uc774\ubbc0\ub85c \ub367\ubd99\uc77c \ub300\uc0c1 \ubc84\ud37c\uc758 \uae38\uc774\ub97c<\/P>
\n\/\/ \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\ud37c\uc5d0 \ubcf5\uc0ac\ud55c\ub2e4.
else {<\/P>
\n\/\/ \ub300\uc0c1 \ubc84\ud37c\uc758 \uae38\uc774\uc640 \ub367\ubd99\uc77c \uae38\uc774\ub97c \ub354\ud55c \ub9cc\ud07c\uc758 \ubc84\ud37c \uc0dd\uc131
retString = (unsigned char*)malloc(sizeof(unsigned char) * (destLen + addLen + 1));<\/P>
\n\/\/ \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];
}<\/P>
\n\/\/ \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];
}<\/P>
\n\/\/ \uc548\uc804\uc744 \uc704\ud574 \ubc84\ud37c\uc758 \ub9c8\uc9c0\ub9c9\uc5d0 NULL \ubc14\uc774\ud2b8\ub97c \ubd99\uc778\ub2e4.
retString[i + destLen] = NULL;
}<\/P>
\n<\/P>
\n\/\/ \uba54\ubaa8\ub9ac\uc5d0\uc11c \uc0ad\uc81c<\/P>
\nfree(destString);<\/P>
\nreturn retString;
}<\/P><\/BLOCKQUOTE>
<\/P><\/p>\n","protected":false},"excerpt":{"rendered":"#include <stdio.h>#include <string.h>#include <openssl\/bio.h>#include <openssl\/err.h>#include <openssl\/bn.h>#include <openssl\/dh.h>#include <openssl\/rand.h>#include <openssl\/pem.h> #define IN_FILE “.\/plain.txt” \/\/ plain file#define OUT_FILE “.\/encrypt.txt” \/\/ cipher file unsigned char* readFile(char *file, int *readLen);unsigned char *readFileBio(BIO *fileBIO, int *readLen);unsigned char *addString(unsigned char … Continue reading