Question

I have an function which decodes the encoded base64 data in binary data but I dont know how to find the length of decoded data. I use the BIO functions in openssl.

unsigned char *unbase64(unsigned char *input, int length) {     BIO *b64, *bmem;      unsigned char *buffer = (unsigned char *)malloc(length);     memset(buffer, 0, length);      b64 = BIO_new(BIO_f_base64());     bmem = BIO_new_mem_buf(input, length);     bmem = BIO_push(b64, bmem);      BIO_read(bmem, buffer, length);      BIO_free_all(bmem);      return buffer; } 

Answer 1

BIO_read will return the number of bytes read. You should check for return values throughout, anyway.