Sha256 class final

SHA-256 (FIPS 180-4) as an incremental hash.

Used by the 7z AES key derivation (iterated SHA-256) and RAR5 (PBKDF2-HMAC-SHA256, hash-key checksum tweaking). All arithmetic stays within unsigned 32-bit range (dart2js-exact).

Inheritance

• Object
• BlockHash
• Sha256

Constructors

Sha256()

Creates a SHA-256 hash in its initial state.

Properties

digestSize → int

Digest length in bytes (20 for SHA-1, 32 for SHA-256).

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

add(Uint8List chunk, [int start = 0, int? end]) → void

Updates the hash with chunk[start..end).

inherited

compress(Uint8List block, int offset) → void

Compresses the 64 bytes at block[offset..offset+64) into the state.

override

copy() → Sha256

Returns an independent copy of the running state.

override

finish() → Uint8List

Pads, compresses the final block(s), and returns the digest. The hash cannot be updated afterwards; snapshot with copy first to continue a running stream.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

writeDigest(Uint8List out) → void

Writes the state words to out big-endian.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

compute(Uint8List data) → Uint8List

Computes the SHA-256 digest of data in one call.