【发布时间】：2014-09-18 14:57:42
【问题描述】：
经过研究，我认为是时候寻求帮助了，因为我不明白问题出在哪里。 我正在使用 OpenSSL 进行加密和解密。 我修复了代码，以便更清楚谁可能愿意帮助我。 它基本上由三个函数组成：generate_key_pair、example_one、example_two 在示例中，我加载文件的内容，密码学家，将内容放入变量中，解密变量的内容，将结果放入另一个变量中。 一切都很完美。 在示例二中，我携带文件的内容，密码学家，将内容放入文件，加载文件内容，解密。 在这种情况下，当我解密时会出现一个我无法确定如何避免的“污垢”。 我把这几个词放在代码中，我用来编译的命令和得到的结果。 已经很感谢大家了。
编译：
gcc -std=c99 source\RSA\RSA.c source\RSA\applink.c -Isource\RSA\include -Lsource\RSA\lib\openssl -leay32 -lssleay32 -o build\rsa.exe
代码：
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <stdio.h>
#include <string.h>
int generate_key_pair(int KEY_LENGTH, char *PRIVATE_KEY_FILENAME, char *PUBLIC_KEY_FILENAME)
{
FILE *KEY_FILE;
RSA *KEY_PAIR;
int RESULT = 0;
KEY_PAIR = RSA_generate_key(KEY_LENGTH, 17, NULL, NULL);
KEY_FILE = fopen(PRIVATE_KEY_FILENAME,"w");
RESULT = PEM_write_RSAPrivateKey(KEY_FILE, KEY_PAIR, NULL, NULL, 0, NULL, NULL);
fclose(KEY_FILE);
KEY_FILE = fopen(PUBLIC_KEY_FILENAME,"w");
RESULT = (RESULT && PEM_write_RSAPublicKey(KEY_FILE, KEY_PAIR));
fclose(KEY_FILE);
return RESULT;
}
void example_one(int KEY_LENGTH, char *PRIVATE_KEY_FILENAME, char *PUBLIC_KEY_FILENAME)
{
printf("--- EXAMPLE 1: BEGIN---\r\n\r\n");
RSA *PUBLIC_KEY = NULL;
RSA *PRIVATE_KEY = NULL;
FILE *KEY_FILE;
KEY_FILE = fopen(PUBLIC_KEY_FILENAME, "r");
PUBLIC_KEY = PEM_read_RSAPublicKey(KEY_FILE,NULL,NULL,NULL);
KEY_FILE = fopen(PRIVATE_KEY_FILENAME, "r");
PRIVATE_KEY = PEM_read_RSAPrivateKey(KEY_FILE,NULL,NULL,NULL);
int PUBLIC_KEY_SIZE = RSA_size(PUBLIC_KEY);
int PRIVATE_KEY_SIZE = RSA_size(PRIVATE_KEY);
FILE *INPUT_FILE = fopen("BUFFER.TXT", "r");
fseek(INPUT_FILE, 0, SEEK_END);
int INPUT_FILE_SIZE = ftell(INPUT_FILE);
rewind(INPUT_FILE);
char *FILE_CONTENTS = malloc(KEY_LENGTH/8);
fread(FILE_CONTENTS, sizeof(char), INPUT_FILE_SIZE, INPUT_FILE);
fclose(INPUT_FILE);
FILE_CONTENTS[INPUT_FILE_SIZE] = '\0';
printf("ORIGINAL FILE_CONTENTS=\r\n%s\r\n\r\n",FILE_CONTENTS);
char *ENCRYPTED = NULL;
char *DECRYPTED = NULL;
ENCRYPTED = malloc(PUBLIC_KEY_SIZE);
RSA_public_encrypt(strlen(FILE_CONTENTS), (unsigned char*)FILE_CONTENTS, (unsigned char*)ENCRYPTED, PUBLIC_KEY, RSA_PKCS1_OAEP_PADDING);
printf("ENCRYPTED=\r\n%s\r\n\r\n",ENCRYPTED);
DECRYPTED = malloc(PRIVATE_KEY_SIZE);
RSA_private_decrypt(PRIVATE_KEY_SIZE, (unsigned char*)ENCRYPTED, (unsigned char*)DECRYPTED, PRIVATE_KEY, RSA_PKCS1_OAEP_PADDING);
printf("DECRYPTED=\r\n%s\r\n\r\n",DECRYPTED);
free(ENCRYPTED);
ENCRYPTED = NULL;
free(DECRYPTED);
DECRYPTED = NULL;
printf("--- EXAMPLE 1: END---\r\n\r\n");
}
void example_two(int KEY_LENGTH, char *PRIVATE_KEY_FILENAME, char *PUBLIC_KEY_FILENAME)
{
printf("--- EXAMPLE 2: BEGIN---\r\n\r\n");
RSA *PUBLIC_KEY = NULL;
RSA *PRIVATE_KEY = NULL;
FILE *KEY_FILE;
KEY_FILE = fopen(PUBLIC_KEY_FILENAME, "r");
PUBLIC_KEY = PEM_read_RSAPublicKey(KEY_FILE,NULL,NULL,NULL);
KEY_FILE = fopen(PRIVATE_KEY_FILENAME, "r");
PRIVATE_KEY = PEM_read_RSAPrivateKey(KEY_FILE,NULL,NULL,NULL);
int PUBLIC_KEY_SIZE = RSA_size(PUBLIC_KEY);
int PRIVATE_KEY_SIZE = RSA_size(PRIVATE_KEY);
FILE *INPUT_FILE = fopen("BUFFER.TXT", "r");
fseek(INPUT_FILE, 0, SEEK_END);
int INPUT_FILE_SIZE = ftell(INPUT_FILE);
rewind(INPUT_FILE);
char *FILE_CONTENTS = malloc(KEY_LENGTH/8);
fread(FILE_CONTENTS, sizeof(char), INPUT_FILE_SIZE, INPUT_FILE);
fclose(INPUT_FILE);
FILE_CONTENTS[INPUT_FILE_SIZE] = '\0';
printf("ORIGINAL FILE_CONTENTS=\r\n%s\r\n\r\n",FILE_CONTENTS);
char *ENCRYPTED = NULL;
char *DECRYPTED = NULL;
ENCRYPTED = malloc(PUBLIC_KEY_SIZE);
RSA_public_encrypt(strlen(FILE_CONTENTS), (unsigned char*)FILE_CONTENTS, (unsigned char*)ENCRYPTED, PUBLIC_KEY, RSA_PKCS1_OAEP_PADDING);
printf("ENCRYPTED=\r\n%s\r\n\r\n",ENCRYPTED);
FILE *FILE_OUT = fopen("BUFFER_ENCRYPTED.TXT", "w");
fwrite(ENCRYPTED,sizeof(char),strlen(ENCRYPTED),FILE_OUT);
fclose(FILE_OUT);
free(ENCRYPTED);
ENCRYPTED = NULL;
FILE *FILE_IN = fopen("BUFFER_ENCRYPTED.TXT", "r");
fseek(FILE_IN, 0, SEEK_END);
INPUT_FILE_SIZE = ftell(FILE_IN);
rewind(FILE_IN);
FILE_CONTENTS = malloc(PRIVATE_KEY_SIZE);
fread(FILE_CONTENTS, sizeof(char), PRIVATE_KEY_SIZE, FILE_IN);
fclose(FILE_IN);
printf("ENCRYPTED FILE_CONTENTS=\r\n%s\r\n\r\n",FILE_CONTENTS);
DECRYPTED = malloc(PRIVATE_KEY_SIZE);
RSA_private_decrypt(PRIVATE_KEY_SIZE, (unsigned char*)FILE_CONTENTS, (unsigned char*)DECRYPTED, PRIVATE_KEY, RSA_PKCS1_OAEP_PADDING);
printf("DECRYPTED=\r\n%s\r\n\r\n",DECRYPTED);
FILE_OUT = fopen("BUFFER_DECRYPTED.TXT", "w");
fwrite(DECRYPTED,1,strlen(DECRYPTED),FILE_OUT);
fclose(FILE_OUT);
free(DECRYPTED);
DECRYPTED = NULL;
free(ENCRYPTED);
ENCRYPTED = NULL;
free(DECRYPTED);
DECRYPTED = NULL;
printf("--- EXAMPLE 2: END---\r\n\r\n");
}
int main(void) {
int KEY_LENGTH = 2048;
char *PRIVATE_KEY_FILENAME = "KPRIVATE.PEM";
char *PUBLIC_KEY_FILENAME = "KPUBLIC.PEM";
generate_key_pair(KEY_LENGTH,PRIVATE_KEY_FILENAME,PUBLIC_KEY_FILENAME);
example_one(KEY_LENGTH,PRIVATE_KEY_FILENAME,PUBLIC_KEY_FILENAME);
example_two(KEY_LENGTH,PRIVATE_KEY_FILENAME,PUBLIC_KEY_FILENAME);
return 0;
}
结果：
--- EXAMPLE 1: BEGIN---
ORIGINAL FILE_CONTENTS=
It is a test!
ENCRYPTED=
◄4ƒþ×^ÖÜ_)'┘ó(¿o╚¡Õßçxô╝♂:9·╗♂l│¿,<õС+¨═è╣╚IÙL¶,*A1´çØ↔ß%ém¦e sø¥Qþ¯█‼◄Ð]röwK╠
áWÁ]Úl╗Fv├Æ((Ó*║&^
DECRYPTED=
It is a test!
--- EXAMPLE 1: END---
--- EXAMPLE 2: BEGIN---
ORIGINAL FILE_CONTENTS=
It is a test!
ENCRYPTED=
îþ┘éÑ▬ı;Í5±òM¬ƒ¢ÈkÖ╣┌┬ÆbE☺ã`)[ıó▄■fÞ*ªÄ╚↕ 3É^¾µS86qÜz▬a↑zh▓j´¶È)ë├╬ƒC♂Ë·âÃxÛ╝°ÿ@
Å◄ÈJ~\÷a¼?m▒Ít@♀█ñ¼Ä:£z┤ÀýøGöÞ╩30☼→┘G┬$Ã╩ô°Z‗¢re8►♥k'♫W
ês=ðã;Gfd¬♀@¾þw╚¢Ó_lºóó.├╣ß8┤¼yÝ╚þ┬☼¦è+zP"│┴Isd19ģǹ×^╣ñ0‼▀Zƒ¾↑}▬.Æãáý·│yCb?ù©u
_|ıƒÀ
ENCRYPTED FILE_CONTENTS=
îþ┘éÑ▬ı;Í5±òM¬ƒ¢ÈkÖ╣┌┬ÆbE☺ã`)[ıó▄■fÞ*ªÄ╚↕ 3É^¾µS86qÜz▬a↑zh▓j´¶È)ë├╬ƒC♂Ë·âÃxÛ╝°ÿ@
Å◄ÈJ~\÷a¼?m▒Ít@♀█ñ¼Ä:£z┤ÀýøGöÞ╩30☼→┘G┬$Ã╩ô°Z‗¢re8►♥k'♫W
ês=ðã;Gfd¬♀@¾þw╚¢Ó_lºóó.├╣ß8┤¼yÝ╚þ┬☼¦è+zP"│┴Isd19ģǹ×^╣ñ0‼▀Zƒ¾↑}▬.Æãáý·│yCb?ù©u
_|ıƒÀ
DECRYPTED=
It is a test!òM¬ƒ¢ÈkÖ╣┌┬ÆbE☺ã`)[ıó▄■fÞ*ªÄ╚↕ 3É^¾µS86qÜz▬a↑zh▓j´¶È)ë├╬ƒC♂Ë·âÃxÛ╝°
Å◄ÈJ~\÷a¼?m▒Ít@♀█ñ¼Ä:£z┤ÀýøGöÞ╩30☼→┘G┬$Ã╩ô°Z‗¢re8►♥k'♫W
ês=ðã;Gfd¬♀@¾þw╚¢Ó_lºóó.├╣ß8┤¼yÝ╚þ┬☼¦è+zP"│┴Isd19ģǹ×^╣ñ0‼▀Zƒ¾↑}▬.Æãáý·│yCb?ù©u
_¶ƒÀ,
--- EXAMPLE 2: END---
【问题讨论】：
标签： c encryption openssl