58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
#include <string.h>
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#include <jni.h>
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#include <stdio.h>
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#include <android/log.h>
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#include <openssl/md5.h>
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#include <openssl/blowfish.h>
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JNIEXPORT void JNICALL Java_f_f_freezer_Deezer_decryptFile(JNIEnv *env, jobject obj, jstring jTrackId, jstring jInputFilename, jstring jOutputFilename) {
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//Get parameters from jstring to base C
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const char *inputFilename = (*env)->GetStringUTFChars(env, jInputFilename, NULL);
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const char *outputFilename = (*env)->GetStringUTFChars(env, jOutputFilename, NULL);
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const char *trackId = (*env)->GetStringUTFChars(env, jTrackId, NULL);
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//Calculate track id MD5
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unsigned char digest[MD5_DIGEST_LENGTH];
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MD5_CTX context;
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MD5_Init(&context);
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MD5_Update(&context, trackId, strlen(trackId));
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MD5_Final(digest, &context);
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char MD5String[33];
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for (int i = 0; i < 16; i++)
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sprintf(&MD5String[i*2], "%02x", (unsigned int)digest[i]);
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//Generate decryption key
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char bfKey[17] = "";
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const char secret[] = "g4el58wc0zvf9na1";
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for(int i=0; i<16; i++)
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bfKey[i] = MD5String[i] ^ MD5String[i+16] ^ secret[i];
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//__android_log_print(ANDROID_LOG_WARN, "DECRYPTOR", "TRACK: %s, MD5: %s, KEY: %s", trackId, MD5String, bfKey);
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BF_KEY key;
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BF_set_key(&key, 16, bfKey);
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//Open files
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FILE *ifile = fopen(inputFilename, "rb");
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FILE *ofile = fopen(outputFilename, "wb");
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//Decrypt
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int i=0;
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while (!feof(ifile)) {
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unsigned char buffer[2048];
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int read = fread(buffer, 1, 2048, ifile);
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if (i % 3 == 0 && read == 2048) {
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unsigned char decrypted[2048];
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unsigned char IV[8] = {0,1,2,3,4,5,6,7};
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BF_cbc_encrypt(buffer, decrypted, 2048, &key, IV, BF_DECRYPT);
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fwrite(decrypted, sizeof(unsigned char), sizeof(decrypted), ofile);
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} else {
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int written = fwrite(buffer, sizeof(unsigned char), (size_t)read, ofile);
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}
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i++;
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}
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fclose(ifile);
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fclose(ofile);
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//Free the parameters
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(*env)->ReleaseStringUTFChars(env, jInputFilename, inputFilename);
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(*env)->ReleaseStringUTFChars(env, jOutputFilename, outputFilename);
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(*env)->ReleaseStringUTFChars(env, jTrackId, trackId);
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} |