\/\/ use_rsa.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 <string.h><\/p>\n
#include <openssl\/bio.h>
#include <openssl\/err.h>
#include <openssl\/bn.h>
#include <openssl\/rsa.h>
#include <openssl\/evp.h>
#include <openssl\/objects.h>
#include <openssl\/x509.h>
#include <openssl\/rand.h>
#include <openssl\/pem.h><\/p>\n
int main(int argc, char** argv)
{
\/\/ \ubcc0\uc218 \uc815\uc758
BIO *keyBIO = NULL;
BIO *errBIO = NULL;
BIO *rsa = NULL;
char keyFile[100];
char KeyFormat[10];
char encType[10];
char keyType[10];
char inFile[100];
char outFile[100];
BIO *inBIO = NULL;
BIO *outBIO = NULL;
\/\/ \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);
\/\/ \uc554\ud638\ud654\ub97c \ud55c\uac74\uc9c0 \ubcf5\ud638\ud654\ub97c \ud55c \uac74\uc9c0 \uc120\ud0dd
printf(“\uc554\ud638\ud654, \ubcf5\ud638\ud654 \uc120\ud0dd (e,d): “);
scanf(“%s”, encType);
\/\/ \ud0a4\ub97c \uacf5\uac1c\ud0a4\ub97c \uc0ac\uc6a9 \ud560 \uac74\uc9c0, \uac1c\uc778\ud0a4\ub97c \uc0ac\uc6a9 \ud560 \uac74\uc9c0 \uc120\ud0dd
printf(“\uacf5\uac1c\ud0a4, \uac1c\uc778\ud0a4 \uc120\ud0dd(pri,pub): “);
scanf(“%s”, keyType);
\/\/ \ud0a4 \ud30c\uc77c\uba85 \uc785\ub825
printf(“\ud0a4 \ud30c\uc77c\uc744 \uc785\ub825 \ud558\uc138\uc694: “);
scanf(“%s”, keyFile);
\/\/ \ud0a4 \ud30c\uc77c \ud615\uc2dd \uc785\ub825
printf(“\ud0a4 \ud30c\uc77c\uc758 \ud615\uc2dd\uc744 \uc785\ub825 \ud558\uc138\uc694. (PEM,DER): “);
scanf(“%s”, KeyFormat);
\/\/ \uc785\ub825 \ud30c\uc77c\uba85 \uc785\ub825
printf(“\uc785\ub825 \ud30c\uc77c\uba85\uc744 \uc785\ub825 \ud558\uc138\uc694: “);
scanf(“%s”, inFile);
\/\/ \ucd9c\ub825 \ud30c\uc77c\uba85 \uc785\ub825
printf(“\ucd9c\ub825 \ud30c\uc77c\uba85\uc744 \uc785\ub825 \ud558\uc138\uc694: “);
scanf(“%s”, outFile);
\/\/ \ud0a4 \ud30c\uc77c BIO \uc0dd\uc131
keyBIO = BIO_new(BIO_s_file());
if(keyBIO == NULL) {
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \ud0a4 \ud30c\uc77c \uc77d\uc74c
if(BIO_read_filename(keyBIO, keyFile) <= 0) {
BIO_printf(errBIO, “\ud0a4 \ud30c\uc77c [%s]\uc744 \uc5ec\ub294\ub370 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd \ud588\uc2b5\ub2c8\ub2e4.”, keyFile);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ DER \ud615\uc2dd\uc774\uba74, \ud0a4 \ud30c\uc77c BIO\uc5d0\uc11c \ud0a4 \ub0b4\uc6a9\uc744 \uc77d\uc5b4\uc11c rsa \uad6c\uc870\uccb4 \ud615\uc2dd\uc73c\ub85c \ubcc0\ud658
if(strcmp(KeyFormat, “DER”) == 0) {
\/\/ \uac1c\uc778\ud0a4\uc640 \uacf5\uac1c\ud0a4\uc5d0 \ub530\ub77c\uc11c \ub2e4\ub978 \ud568\uc218 \uc0ac\uc6a9
if(strcmp(keyType, “pub”) == 0)
rsa = d2i_RSAPublicKey_bio(keyBIO, NULL);
else
rsa = d2i_RSAPrivateKey_bio(keyBIO, NULL);
}
\/\/ PEM \ud615\uc2dd\uc774\uba74, \ud0a4 \ud30c\uc77c BIO\uc5d0\uc11c \ud0a4 \ub0b4\uc6a9\uc744 \uc77d\uc5b4\uc11c rsa \uad6c\uc870\uccb4 \ud615\uc2dd\uc73c\ub85c \ubcc0\ud658
else if(strcmp(KeyFormat, “PEM”) == 0) {
\/\/ \uac1c\uc778\ud0a4\uc640 \uacf5\uac1c\ud0a4\uc5d0 \ub530\ub77c\uc11c \ub2e4\ub978 \ud568\uc218 \uc0ac\uc6a9
if(strcmp(keyType, “pub”) == 0)
rsa = PEM_read_bio_RSA_PUBKEY(keyBIO, NULL, NULL, NULL);
else
rsa = PEM_read_bio_RSAPrivateKey(keyBIO, NULL, NULL, NULL);
}
else {
BIO_printf(errBIO, “\uc54c \uc218 \uc5c6\ub294 \ud3ec\uba67[%s] \uc785\ub2c8\ub2e4.”, KeyFormat);
}
\/\/ \ud0a4\ub97c \ub85c\ub4dc \ud558\ub294\ub370 \uc5d0\ub7ec \ubc1c\uc0dd
if(rsa == NULL) {
BIO_printf(errBIO, “\ud0a4\ub97c \ub85c\ub4dc \ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.”);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \uc785\ub825 \ud30c\uc77c\uc5d0\uc11c BIO \uc0dd\uc131
inBIO = BIO_new_file(inFile, “rb”);
if(!inBIO) {
BIO_printf(errBIO, “\uc785\ub825 \ud30c\uc77c [%s]\uc744 \uc5ec\ub294\ub370 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd \ud588\uc2b5\ub2c8\ub2e4.”, inFile);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \ucd9c\ub825 \ud30c\uc77c\uc5d0\uc11c BIO \uc0dd\uc131
outBIO = BIO_new_file(outFile, “wb”);
if(!outBIO) {
BIO_printf(errBIO, “\ucd9c\ub825 \ud30c\uc77c [%s]\uc744 \uc0dd\uc131\ud558\ub294\ub370 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd \ud588\uc2b5\ub2c8\ub2e4.”, outFile);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \uc77d\uc740 \ud0a4\uc758 \uae38\uc774\ub97c \uc5bb\uc74c
int keySize = RSA_size(rsa);
\/\/ \uc785\ub825\ubb38 \ub0b4\uc6a9\uc774 \ub4e4\uc5b4\uac08 \ubc84\ud37c\uc640, \ucd9c\ub825\ubb38 \ub0b4\uc6a9\uc774 \ub4e4\uc5b4\uac08 \ubc84\ud37c \uc0dd\uc131
\/\/ \uc785\ub825 \ubc84\ud37c\uc758 \uae38\uc774\ub294 \ud0a4 \uae38\uc774\uc758 \ub450\ubc30, \ucd9c\ub825 \ubc84\ud37c\ub294 \ud0a4 \uae38\uc774\uc640 \ub3d9\uc77c
unsigned char *inBuffer = (unsigned char *)malloc(keySize * 2);
unsigned char *outBuffer = (unsigned char *)malloc(keySize);
\/\/ \ud328\ub529 \uc815\uc758, \uc77c\ubc18\uc801\uc778 \ud328\ub529\uc73c\ub85c \uc0ac\uc6a9
unsigned char pad = RSA_PKCS1_PADDING;
\/\/ \uc785\ub825\ubb38 \ud30c\uc77c\uc5d0\uc11c \ub0b4\uc6a9 \uc77d\uc5b4 \ubc84\ud37c\uc5d0 \uc800\uc7a5
int inLength = BIO_read(inBIO, inBuffer, keySize * 2);
int outLength = 0;
\/\/ \uacf5\uac1c\ud0a4\ub85c \uc554\ud638\ud654 \ud560\ub54c, \uc785\ub825 \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \uc554\ud638\ud654\ud574\uc11c \ucd9c\ub825 \ubc84\ud37c\uc5d0 \ub123\uc74c
if((strcmp(encType, “e”) == 0) && (strcmp(keyType, “pub”) == 0))
outLength = RSA_public_encrypt(inLength, inBuffer, outBuffer, rsa, pad);
\/\/ \uac1c\uc778\ud0a4\ub85c \uc554\ud638\ud654 \ud560\ub54c, \uc785\ub825 \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \uc554\ud638\ud654\ud574\uc11c \ucd9c\ub825 \ubc84\ud37c\uc5d0 \ub123\uc74c
else if((strcmp(encType, “e”) == 0) && (strcmp(keyType, “pri”) == 0))
outLength = RSA_private_encrypt(inLength, inBuffer, outBuffer, rsa, pad);
\/\/ \uacf5\uce90\ud0a4\ub85c \ubcf5\ud638\ud654 \ud560\ub54c, \uc785\ub825 \ubc84\ud37c\uc758 \ub0b4\uc6a9\uc744 \ubcf5\ud638\ud654\ud574\uc11c \ucd9c\ub825 \ubc84\ud37c\uc5d0 \ub123\uc74c
else if((strcmp(encType, “d”) == 0) && (strcmp(keyType, “pub”) == 0))
outLength = RSA_public_decrypt(inLength, inBuffer, outBuffer, rsa, pad);
else if((strcmp(encType, “d”) == 0) && (strcmp(keyType, “pri”) == 0))
outLength = RSA_private_decrypt(inLength, inBuffer, outBuffer, rsa, pad);
\/\/ \uc554\ud638\ud654 \ud639\uc740 \ubcf5\ud638\ud654\uc2dc \uc5d0\ub7ec \ubc1c\uc0dd \uccb4\ud06c
if(outLength <= 0) {
BIO_printf(errBIO, “RSA \uc554\ud638\ud654\uc2dc \uc5d0\ub7ec \ubc1c\uc0dd”);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \ucd9c\ub825 \ud30c\uc77c\uc5d0 \ucd9c\ub825 \ubc84\ud37c\uc758 \ub0b4\uc6a9 \uc800\uc7a5
BIO_write(outBIO, outBuffer, outLength);
BIO_printf(errBIO, “\uc644\ub8cc \ub418\uc5c8\uc2b5\ub2c8\ub2e4.”);
\/\/ \uac1d\uccb4 \uc81c\uac70
if(keyBIO != NULL)
BIO_free(keyBIO);
if(rsa != NULL)
RSA_free(rsa);
free(inBuffer);
free(outBuffer);
return 0;
}<\/p>\n","protected":false},"excerpt":{"rendered":"
\/\/ use_rsa.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