use crypto/sha256 only for FIPS 140-2 compliance (#14983)

It would seem like the PR #11623 had chewed more
than it wanted to, non-fips build shouldn't really
be forced to use slower crypto/sha256 even for
presumed "non-performance" codepaths. In MinIO
there are really no "non-performance" codepaths.
This assumption seems to have had an adverse
effect in certain areas of CPU usage.

This PR ensures that we stick to sha256-simd
on all non-FIPS builds, our most common build
to ensure we get the best out of the CPU at
any given point in time.

cmd/bitrot.go

@@ -19,7 +19,6 @@ package cmd
 
 import (
 	"bytes"
-	"crypto/sha256"
 	"encoding/hex"
 	"errors"
 	"fmt"
@@ -27,6 +26,7 @@ import (
 	"io"
 
 	"github.com/minio/highwayhash"
+	"github.com/minio/minio/internal/hash/sha256"
 	"golang.org/x/crypto/blake2b"
 
 	xioutil "github.com/minio/minio/internal/ioutil"

cmd/erasure-metadata.go

@@ -19,7 +19,6 @@ package cmd
 
 import (
 	"context"
-	"crypto/sha256"
 	"encoding/hex"
 	"fmt"
 	"net/http"
@@ -28,6 +27,7 @@ import (
 	"time"
 
 	"github.com/minio/minio/internal/bucket/replication"
+	"github.com/minio/minio/internal/hash/sha256"
 	xhttp "github.com/minio/minio/internal/http"
 	"github.com/minio/minio/internal/logger"
 	"github.com/minio/minio/internal/sync/errgroup"

cmd/hasher.go

@@ -19,8 +19,9 @@ package cmd
 
 import (
 	"crypto/md5"
-	"crypto/sha256"
 	"encoding/hex"
+
+	"github.com/minio/minio/internal/hash/sha256"
 )
 
 // getSHA256Hash returns SHA-256 hash in hex encoding of given data.

cmd/signature-v4-utils.go

@@ -20,7 +20,6 @@ package cmd
 import (
 	"bytes"
 	"crypto/hmac"
-	"crypto/sha256"
 	"encoding/hex"
 	"io"
 	"io/ioutil"
@@ -29,6 +28,7 @@ import (
 	"strings"
 
 	"github.com/minio/minio/internal/auth"
+	"github.com/minio/minio/internal/hash/sha256"
 	xhttp "github.com/minio/minio/internal/http"
 	"github.com/minio/minio/internal/logger"
 )

cmd/signature-v4.go

@@ -27,7 +27,6 @@ package cmd
 
 import (
 	"bytes"
-	"crypto/sha256"
 	"crypto/subtle"
 	"encoding/hex"
 	"net/http"
@@ -40,6 +39,7 @@ import (
 	"github.com/minio/minio-go/v7/pkg/s3utils"
 	"github.com/minio/minio-go/v7/pkg/set"
 	"github.com/minio/minio/internal/auth"
+	"github.com/minio/minio/internal/hash/sha256"
 	xhttp "github.com/minio/minio/internal/http"
 )
 

cmd/streaming-signature-v4.go

@@ -22,7 +22,6 @@ package cmd
 import (
 	"bufio"
 	"bytes"
-	"crypto/sha256"
 	"encoding/hex"
 	"errors"
 	"hash"
@@ -32,6 +31,7 @@ import (
 
 	humanize "github.com/dustin/go-humanize"
 	"github.com/minio/minio/internal/auth"
+	"github.com/minio/minio/internal/hash/sha256"
 	xhttp "github.com/minio/minio/internal/http"
 )
 

cmd/sts-handlers.go

@@ -20,7 +20,6 @@ package cmd
 import (
 	"bytes"
 	"context"
-	"crypto/sha256"
 	"crypto/x509"
 	"encoding/base64"
 	"errors"
@@ -34,6 +33,7 @@ import (
 	"github.com/minio/madmin-go"
 	"github.com/minio/minio/internal/auth"
 	"github.com/minio/minio/internal/config/identity/openid"
+	"github.com/minio/minio/internal/hash/sha256"
 	xhttp "github.com/minio/minio/internal/http"
 	"github.com/minio/minio/internal/logger"
 	iampolicy "github.com/minio/pkg/iam/policy"