Encryption (Rijndael Cipher) With C/C++ in Android NDK -

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i want convert c#(managed) decryption method android ndk, c/c++ (no java)

i see there crypto. on java side want keep away jni, , see there's mcrypt , crypt++ cant find compiled lib android.

here example in c# want translate, c/c++

    public byte[] decryptbytes(byte[] encryptedbytes)                {     rijndaelmanaged rijndaelcipher = new rijndaelmanaged();               rijndaelcipher.mode = ciphermode.cbc;              icryptotransform decryptor = rijndaelcipher.createdecryptor(bytes32_key, bytes16_iv);              memorystream memorystream = new memorystream(encryptedbytes);             cryptostream cryptostream = new cryptostream(memorystream, decryptor, cryptostreammode.read);             byte[] plainbytes = new byte[encryptedbytes.length];              int decryptedcount = cryptostream.read(plainbytes, 0, plainbytes.length);              memorystream.close();             cryptostream.close();              return plainbytes;      };

update best i've found far use openssl aes, have downloaded pre-compiled lib android, i'm struggling work example posted working here c code example

void test_enc(){      int keylength = 256;      //  // 256bit key         uint8_t key[32] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,             0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,             0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f};          //128bit iv         uint8_t iv[16] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};           //input data         uint8_t input[64] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,             0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};      size_t inputslength = 10;     int x;      uint8_t *aes_key = key;      uint8_t *aes_input = input;      uint8_t *iv_enc = iv;     uint8_t *iv_dec = iv;      // buffers encryption , decryption     const size_t encslength = ((inputslength + aes_block_size) / aes_block_size) * aes_block_size;     uint8_t *enc_out = (uint8_t*)malloc(sizeof(uint8_t) *encslength);     uint8_t *dec_out = (uint8_t*)malloc(sizeof(uint8_t) *inputslength);     memset(enc_out, 0, encslength);     memset(dec_out, 0, inputslength);      // can aes-cbc-128 aes-cbc-192 aes-cbc-256     aes_key enc_key, dec_key;     aes_set_encrypt_key(aes_key, keylength, &enc_key);     aes_cbc_encrypt(input, enc_out, inputslength, &enc_key, iv_enc, aes_encrypt);      aes_set_decrypt_key(aes_key, keylength, &dec_key);       aes_cbc_encrypt(enc_out, dec_out, encslength, &dec_key, iv_dec, aes_decrypt);      logi("before:");     for(x=0;x<inputslength;x++)         logi("%02x, ", input[x]);      logi("encrypted:");     for(x=0;x<encslength;x++)         logi("%02x, ", enc_out[x]);      logi("decrypted:");     for(x=0;x<encslength;x++)         logi("%02x, ", dec_out[x]); };

the encrypted bytes aren't same c# , decrypt doesn't go input, have gone wrong ?

solved:

issue appears array held iv gets altered after encryption need reset before decrypt result

using pre-built openssl android can find here openssl-for-android-prebuilt

and code above remember set iv before each call aes_cbc_encrypt.


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