Struct sequoia_openpgp::packet::signature::subpacket::CLOCK_SKEW_TOLERANCE [−][src]
pub struct CLOCK_SKEW_TOLERANCE { /* fields omitted */ }Expand description
The default amount of tolerance to use when comparing some timestamps.
Used by Subpacket::signature_alive.
When determining whether a timestamp generated on another machine is valid now, we need to account for clock skew. (Note: you don’t normally need to consider clock skew when evaluating a signature’s validity at some time in the past.)
We tolerate half an hour of skew based on the following anecdote: In 2019, a developer using Sequoia in a Windows VM running inside of Virtual Box on Mac OS X reported that he typically observed a few minutes of clock skew and occasionally saw over 20 minutes of clock skew.
Note: when new messages override older messages, and their signatures are evaluated at some arbitrary point in time, an application may not see a consistent state if it uses a tolerance. Consider an application that has two messages and wants to get the current message at time te:
- t0: message 0
- te: “get current message”
- t1: message 1
If te is close to t1, then t1 may be considered valid, which is probably not what you want.
Methods from Deref<Target = Duration>
Returns true if this Duration spans no time.
Examples
use std::time::Duration;
assert!(Duration::ZERO.is_zero());
assert!(Duration::new(0, 0).is_zero());
assert!(Duration::from_nanos(0).is_zero());
assert!(Duration::from_secs(0).is_zero());
assert!(!Duration::new(1, 1).is_zero());
assert!(!Duration::from_nanos(1).is_zero());
assert!(!Duration::from_secs(1).is_zero());Returns the number of whole seconds contained by this Duration.
The returned value does not include the fractional (nanosecond) part of the
duration, which can be obtained using subsec_nanos.
Examples
use std::time::Duration;
let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_secs(), 5);To determine the total number of seconds represented by the Duration,
use as_secs in combination with subsec_nanos:
use std::time::Duration;
let duration = Duration::new(5, 730023852);
assert_eq!(5.730023852,
duration.as_secs() as f64
+ duration.subsec_nanos() as f64 * 1e-9);Returns the fractional part of this Duration, in whole milliseconds.
This method does not return the length of the duration when represented by milliseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one thousand).
Examples
use std::time::Duration;
let duration = Duration::from_millis(5432);
assert_eq!(duration.as_secs(), 5);
assert_eq!(duration.subsec_millis(), 432);Returns the fractional part of this Duration, in whole microseconds.
This method does not return the length of the duration when represented by microseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one million).
Examples
use std::time::Duration;
let duration = Duration::from_micros(1_234_567);
assert_eq!(duration.as_secs(), 1);
assert_eq!(duration.subsec_micros(), 234_567);Returns the fractional part of this Duration, in nanoseconds.
This method does not return the length of the duration when represented by nanoseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one billion).
Examples
use std::time::Duration;
let duration = Duration::from_millis(5010);
assert_eq!(duration.as_secs(), 5);
assert_eq!(duration.subsec_nanos(), 10_000_000);Returns the total number of whole milliseconds contained by this Duration.
Examples
use std::time::Duration;
let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_millis(), 5730);Returns the total number of whole microseconds contained by this Duration.
Examples
use std::time::Duration;
let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_micros(), 5730023);Returns the total number of nanoseconds contained by this Duration.
Examples
use std::time::Duration;
let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_nanos(), 5730023852);Returns the number of seconds contained by this Duration as f64.
The returned value does include the fractional (nanosecond) part of the duration.
Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.as_secs_f64(), 2.7);Returns the number of seconds contained by this Duration as f32.
The returned value does include the fractional (nanosecond) part of the duration.
Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.as_secs_f32(), 2.7);