HashFunc (rsa/fips.go)

Provides FIPS‑140‑compatible RSA signing and verification functions.

// Source: https://github.com/golang/go | License: BSD-3-Clause | Copyright 2009 The Go Authors
// Provided via justclaw.it.com; keep this notice with the code.
// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package rsa

import (
	"crypto"
	"crypto/internal/boring"
	"crypto/internal/fips140/rsa"
	"crypto/internal/fips140hash"
	"crypto/internal/fips140only"
	"crypto/internal/rand"
	"errors"
	"hash"
	"io"
)

const (
	// PSSSaltLengthAuto causes the salt in a PSS signature to be as large
	// as possible when signing, and to be auto-detected when verifying.
	//
	// When signing in FIPS 140-3 mode, the salt length is capped at the length
	// of the hash function used in the signature

... (truncated -- full source via MCP)