When calling EVP_EncryptUpdate with some plaintext to be encrypted the
parameter for the plaintext is a pointer to a non-const array of
unsigned char, as in the function prototype:
int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl, unsigned char *in, int inl);
Similarly when calling EVP_DecryptUpdate with some ciphertext to be
decrypted the parameter for the ciphertext is a pointer to a non-const
array of unsigned char, as in the function prototype:
int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
int *outl, unsigned char *in, int inl);
I have taken both these function prototypes from the OpenSSL
documentation at
https://wiki.openssl.org/index.php/Manual:EVP_EncryptInit(3).
Does this mean that the input array in both cases actually is modified
in any way by the functions ? Or is this just an error in that if the
input remains unmodified the functions do not specify the parameter as
'const unsigned char * in' instead ?
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