EVP_EncryptUpdate_ex function

@RecordUse.new() @Native<Int Function(Pointer<EVP_CIPHER_CTX>, Pointer<Uint8>, Pointer<Size>, Size, Pointer<Uint8>, Size)>(ffi.Pointer<EVP_CIPHER_CTX>, ffi.Pointer<ffi.Uint8>, ffi.Pointer<ffi.Size>, ffi.Size, ffi.Pointer<ffi.Uint8>, ffi.Size)>(symbol: 'bssl_dart_EVP_EncryptUpdate_ex') int EVP_EncryptUpdate_ex(Pointer<EVP_CIPHER_CTX> ctx, Pointer<Uint8> out, Pointer<Size> out_len, int max_out_len, Pointer<Uint8> in$, int in_len,)

EVP_EncryptUpdate_ex encrypts in_len bytes from in and writes up to max_out_len bytes of ciphertext to out. On success, it sets *out_len to the number of output bytes and returns one. Otherwise, it returns zero.

If max_out_len is not large enough for the output, the function will return zero. The size of output buffer needed depends on the cipher and the number of bytes encrypted by ctx thus far. EVP_CIPHER_CTX_max_next_update will return the maximum output for this call.

In ciphers whose block size is not 1, such as CBC, individual calls to EVP_EncryptUpdate_ex may output more or less than in_len bytes: a single call to EVP_EncryptUpdate_ex may output at most in_len + block_size - 1 bytes. Additionally, the total output across all EVP_EncryptUpdate_ex and EVP_EncryptFinal_ex2 calls will be at most the total input plus one byte, rounded up to a multiple of the block size.

Implementation

@meta.RecordUse()
@ffi.Native<
  ffi.Int Function(
    ffi.Pointer<EVP_CIPHER_CTX>,
    ffi.Pointer<ffi.Uint8>,
    ffi.Pointer<ffi.Size>,
    ffi.Size,
    ffi.Pointer<ffi.Uint8>,
    ffi.Size,
  )
>(symbol: 'bssl_dart_EVP_EncryptUpdate_ex')
external int EVP_EncryptUpdate_ex(
  ffi.Pointer<EVP_CIPHER_CTX> ctx,
  ffi.Pointer<ffi.Uint8> out,
  ffi.Pointer<ffi.Size> out_len,
  int max_out_len,
  ffi.Pointer<ffi.Uint8> in$,
  int in_len,
);