83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
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#include <cstdio>
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#include <iostream>
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#include <cstring>
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#include <cmath>
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#include <openssl/evp.h>
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#include <openssl/bio.h>
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using namespace std;
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int calcDecodeLength(const char *b64input, const size_t length) {
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int padding = 0;
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// Check for trailing '=''s as padding
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if(b64input[length-1] == '=' && b64input[length-2] == '=')
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padding = 2;
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else if (b64input[length-1] == '=')
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padding = 1;
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return (int)length*0.75 - padding;
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}
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char* base64_encode(const char *message, const size_t length) {
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BIO *bio;
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BIO *b64;
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FILE* stream;
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int encodedSize = 4*ceil((double)length/3);
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char *buffer = (char*)malloc(encodedSize+1);
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if(buffer == NULL) {
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fprintf(stderr, "Failed to allocate memory\n");
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exit(1);
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}
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stream = fmemopen(buffer, encodedSize+1, "w");
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b64 = BIO_new(BIO_f_base64());
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bio = BIO_new_fp(stream, BIO_NOCLOSE);
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bio = BIO_push(b64, bio);
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BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
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BIO_write(bio, message, length);
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(void)BIO_flush(bio);
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BIO_free_all(bio);
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fclose(stream);
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return buffer;
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}
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int base64_decode(const char *b64message, const size_t length, unsigned char **buffer) {
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BIO *bio;
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BIO *b64;
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int decodedLength = calcDecodeLength(b64message, length);
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*buffer = (unsigned char*)malloc(decodedLength+1);
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if(*buffer == NULL) {
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fprintf(stderr, "Failed to allocate memory\n");
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exit(1);
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}
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FILE* stream = fmemopen((char*)b64message, length, "r");
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b64 = BIO_new(BIO_f_base64());
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bio = BIO_new_fp(stream, BIO_NOCLOSE);
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bio = BIO_push(b64, bio);
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BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
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decodedLength = BIO_read(bio, *buffer, length);
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(*buffer)[decodedLength] = '\0';
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BIO_free_all(bio);
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fclose(stream);
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return decodedLength;
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}
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int main(int argc, char * argv[]) {
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const char *message;
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if(argc > 1) {
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message = argv[1];
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} else {
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message = "This isjlakjsdflkjalsfjasdlfjasdldjf a message.";
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}
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cout << base64_encode(message, strlen(message)) << endl;
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return 0;
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}
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