Paul Zinselmeyer
ba8e969470
All checks were successful
Latex Build / build-latex (Assignment 4 - Protokollsicherheit (Praxis)) (push) Successful in 1m2s
Latex Build / build-latex (Assignment 5 - Software Security - Teil 1) (push) Successful in 1m3s
Latex Build / build-latex (Assignment 6 - Software Security - Teil 2) (push) Successful in 1m0s
Latex Build / build-latex (Assignment 4 - Protokollsicherheit (Praxis)) (pull_request) Successful in 30s
Latex Build / build-latex (Assignment 5 - Software Security - Teil 1) (pull_request) Successful in 10s
Latex Build / build-latex (Assignment 6 - Software Security - Teil 2) (pull_request) Successful in 8s
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
#include "Base64.h"
|
|
#include <iostream>
|
|
|
|
static const std::string base64_chars =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
"abcdefghijklmnopqrstuvwxyz"
|
|
"0123456789+/";
|
|
|
|
|
|
static inline bool is_base64(unsigned char c) {
|
|
return (isalnum(c) || (c == '+') || (c == '/'));
|
|
}
|
|
|
|
std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
|
|
std::string ret;
|
|
int i = 0;
|
|
int j = 0;
|
|
unsigned char char_array_3[3];
|
|
unsigned char char_array_4[4];
|
|
|
|
while (in_len--) {
|
|
char_array_3[i++] = *(bytes_to_encode++);
|
|
if (i == 3) {
|
|
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
|
|
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
|
|
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
|
|
char_array_4[3] = char_array_3[2] & 0x3f;
|
|
|
|
for (i=0; i<4; i++)
|
|
ret += base64_chars[char_array_4[i]];
|
|
i = 0;
|
|
}
|
|
}
|
|
|
|
if (i) {
|
|
for(j = i; j < 3; j++)
|
|
char_array_3[j] = '\0';
|
|
|
|
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
|
|
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
|
|
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
|
|
char_array_4[3] = char_array_3[2] & 0x3f;
|
|
|
|
for (j=0; j<i+1; j++)
|
|
ret += base64_chars[char_array_4[j]];
|
|
|
|
while((i++ < 3))
|
|
ret += '=';
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
std::string base64_decode(std::string const& encoded_string) {
|
|
int in_len = encoded_string.size();
|
|
int i = 0;
|
|
int j = 0;
|
|
int in_ = 0;
|
|
unsigned char char_array_4[4], char_array_3[3];
|
|
std::string ret;
|
|
|
|
while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
|
|
char_array_4[i++] = encoded_string[in_];
|
|
in_++;
|
|
if (i ==4) {
|
|
for (i=0; i<4; i++)
|
|
char_array_4[i] = base64_chars.find(char_array_4[i]);
|
|
|
|
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
|
|
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
|
|
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
|
|
|
|
for (i=0; i<3; i++)
|
|
ret += char_array_3[i];
|
|
i = 0;
|
|
}
|
|
}
|
|
|
|
if (i) {
|
|
for (j=i; j<4; j++)
|
|
char_array_4[j] = 0;
|
|
|
|
for (j=0; j<4; j++)
|
|
char_array_4[j] = base64_chars.find(char_array_4[j]);
|
|
|
|
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
|
|
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
|
|
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
|
|
|
|
for (j=0; j<i-1; j++)
|
|
ret += char_array_3[j];
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
|