android heap corruption_native heap allocted_policecorruptio

It is working and it can decipher files without problems but I get random Heap Memory Corruptions when I work with large streams.

From above line it looks to me that your program is clearly overwriting the memory which was allocated implicitly or explicitly by your code. I was trying to understand your code however it was not clear to me. But I tried to look from memory corruption scenario and found that your program does have malloc/free call which might lead to memory overrun.

EVP_CIPHER_CTX *ctx = (EVP_CIPHER_CTX*) malloc(sizeof(EVP_CIPHER_CTX));
EVP_CIPHER_CTX_init(ctx);

EVP_CIPHER_CTX *ctx = (EVP_CIPHER_CTX*) malloc(sizeof(EVP_CIPHER_CTX));
EVP_CIPHER_CTX_init(ctx);

I tried to check the layout of the EVP_CIPHER_CTX structure but it was not available in your code. But I saw that these pointers are getting used in various context within your program. Now you should check that under which scenario your buffer can be overwritten as some places you have used different keyLength and depending on this your program is executing different function. I think you may want to review these codes and see whether overflow is possible!!!....

As your application would be running on android based system where we can not run any dynamic tool(Valgrind/WinDBG/Pageheap..) so I guess you need to review your code by putting some log at important place and see where you are overwriting.

Hope above information would be useful for you to understand your problem.

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