remove support for FIPS 140-2 with boringcrypto (#21292)

This commit removes FIPS 140-2 related code for the following
reasons:
 - FIPS 140-2 is a compliance, not a security requirement. Being
   FIPS 140-2 compliant has no security implication on its own.
   From a tech. perspetive, a FIPS 140-2 compliant implementation
   is not necessarily secure and a non-FIPS 140-2 compliant implementation
   is not necessarily insecure. It depends on the concret design and
   crypto primitives/constructions used.
 - The boringcrypto branch used to achieve FIPS 140-2 compliance was never
   officially supported by the Go team and is now in maintainance mode.
   It is replaced by a built-in FIPS 140-3 module. It will be removed
   eventually. Ref: https://github.com/golang/go/issues/69536
 - FIPS 140-2 modules are no longer re-certified after Sep. 2026.
   Ref: https://csrc.nist.gov/projects/cryptographic-module-validation-program

Signed-off-by: Andreas Auernhammer <github@aead.dev>

internal/config/crypto.go

@@ -27,7 +27,6 @@ import (
 	"io"
 
 	jsoniter "github.com/json-iterator/go"
-	"github.com/minio/minio/internal/fips"
 	"github.com/minio/minio/internal/kms"
 	"github.com/secure-io/sio-go"
 	"github.com/secure-io/sio-go/sioutil"
@@ -64,7 +63,7 @@ func DecryptBytes(k *kms.KMS, ciphertext []byte, context kms.Context) ([]byte, e
 // ciphertext.
 func Encrypt(k *kms.KMS, plaintext io.Reader, ctx kms.Context) (io.Reader, error) {
 	algorithm := sio.AES_256_GCM
-	if !fips.Enabled && !sioutil.NativeAES() {
+	if !sioutil.NativeAES() {
 		algorithm = sio.ChaCha20Poly1305
 	}
 
@@ -145,9 +144,6 @@ func Decrypt(k *kms.KMS, ciphertext io.Reader, associatedData kms.Context) (io.R
 	if err := json.Unmarshal(metadataBuffer, &metadata); err != nil {
 		return nil, err
 	}
-	if fips.Enabled && metadata.Algorithm != sio.AES_256_GCM {
-		return nil, fmt.Errorf("config: unsupported encryption algorithm: %q is not supported in FIPS mode", metadata.Algorithm)
-	}
 
 	key, err := k.Decrypt(context.TODO(), &kms.DecryptRequest{
 		Name:           metadata.KeyID,

internal/config/etcd/etcd.go

@@ -24,7 +24,7 @@ import (
 	"time"
 
 	"github.com/minio/minio/internal/config"
-	"github.com/minio/minio/internal/fips"
+	"github.com/minio/minio/internal/crypto"
 	"github.com/minio/pkg/v3/env"
 	xnet "github.com/minio/pkg/v3/net"
 	clientv3 "go.etcd.io/etcd/client/v3"
@@ -165,8 +165,8 @@ func LookupConfig(kvs config.KVS, rootCAs *x509.CertPool) (Config, error) {
 			MinVersion:               tls.VersionTLS12,
 			NextProtos:               []string{"http/1.1", "h2"},
 			ClientSessionCache:       tls.NewLRUClientSessionCache(64),
-			CipherSuites:             fips.TLSCiphersBackwardCompatible(),
-			CurvePreferences:         fips.TLSCurveIDs(),
+			CipherSuites:             crypto.TLSCiphersBackwardCompatible(),
+			CurvePreferences:         crypto.TLSCurveIDs(),
 		}
 		// This is only to support client side certificate authentication
 		// https://coreos.com/etcd/docs/latest/op-guide/security.html

internal/config/identity/ldap/config.go

@@ -26,7 +26,7 @@ import (
 
 	"github.com/minio/madmin-go/v3"
 	"github.com/minio/minio/internal/config"
-	"github.com/minio/minio/internal/fips"
+	"github.com/minio/minio/internal/crypto"
 	"github.com/minio/pkg/v3/ldap"
 )
 
@@ -197,7 +197,7 @@ func Lookup(s config.Config, rootCAs *x509.CertPool) (l Config, err error) {
 			MinVersion:         tls.VersionTLS12,
 			NextProtos:         []string{"h2", "http/1.1"},
 			ClientSessionCache: tls.NewLRUClientSessionCache(100),
-			CipherSuites:       fips.TLSCiphersBackwardCompatible(), // Contains RSA key exchange
+			CipherSuites:       crypto.TLSCiphersBackwardCompatible(), // Contains RSA key exchange
 			RootCAs:            rootCAs,
 		},
 	}

internal/config/identity/openid/ecdsa-sha3_contrib.go

@@ -11,9 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !fips
-// +build !fips
-
 package openid
 
 import (
@@ -22,7 +19,7 @@ import (
 	"github.com/golang-jwt/jwt/v4"
 
 	// Needed for SHA3 to work - See: https://golang.org/src/crypto/crypto.go?s=1034:1288
-	_ "golang.org/x/crypto/sha3" // There is no SHA-3 FIPS-140 2 compliant implementation
+	_ "golang.org/x/crypto/sha3"
 )
 
 // Specific instances for EC256 and company

internal/config/identity/openid/rsa-sha3_contrib.go

@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !fips
-// +build !fips
-
 package openid
 
 import (
@@ -23,7 +20,7 @@ import (
 	"github.com/golang-jwt/jwt/v4"
 
 	// Needed for SHA3 to work - See: https://golang.org/src/crypto/crypto.go?s=1034:1288
-	_ "golang.org/x/crypto/sha3" // There is no SHA-3 FIPS-140 2 compliant implementation
+	_ "golang.org/x/crypto/sha3"
 )
 
 // Specific instances for RS256 and company