Function write_iterations 

pub fn write_iterations<W: Write>(
    writer: &mut W,
    iterations: u32,
    version: u8,
) -> Result<(), AescryptError>

Writes the v3 PBKDF2 iteration count as 4 big-endian bytes.

Format

iterations.to_be_bytes(), written immediately after the extensions block and immediately before the public IV.

Errors

• AescryptError::UnsupportedVersion — version < 3 (v0/v1/v2 do not carry an iteration count in the header).
• AescryptError::Header — iterations is outside PBKDF2_MIN_ITER ..= PBKDF2_MAX_ITER.
• AescryptError::Io — writer returned an error.

Security

The iteration count gates PBKDF2 cost and is therefore the primary password-cracking-resistance knob. Use DEFAULT_PBKDF2_ITERATIONS for new files unless you have measured your platform.