AES_128_ECB_PKCS5Padding_Decrypt

char * AES_128_ECB_PKCS5Padding_Decrypt(const char *in, const uint8_t* key)
{
    size_t inputLength = 0;
    uint8_t *inputDesBase64=b64_decode_ex(in,strlen(in), &inputLength);
//    const size_t inputLength= (strlen(in) / 4) * 3;
    uint8_t *out=malloc(inputLength);
    memset(out,0,inputLength);
    size_t count=inputLength/16;
    if (count<=0)
    {
        count=1;
    }
    size_t i;
    for ( i = 0; i < count; ++i) {
        AES128_ECB_decrypt(inputDesBase64+i*16,key,out+i*16);
    }


    // remove padding
    int index = findPaddingIndex(out, inputLength);
    if(index==NULL)
    {
        return (char*)out;
    }
    if(index < inputLength){//  if (index>strlen)  will crash.
        memset(out+index, '\0', inputLength-index);
    }

    free(inputDesBase64);
    return (char *) out;
}