crypto/cleanup: remove unused functions

pkg/crypto/sha256/sha256_linux.go

@@ -66,7 +66,7 @@ func block(dig *digest, p []byte) {
 	case cpu.HasSSE41() == true:
 		blockSSE(dig, p)
 	default:
-		blockSoftware(dig, p)
+		blockGeneric(dig, p)
 	}
 }
 

pkg/crypto/sha256/sha256_windows.go

@@ -17,6 +17,7 @@
 package sha256
 
 import (
+	"hash"
 	"io"
 
 	"crypto/sha256"
@@ -45,3 +46,8 @@ func Sum(reader io.Reader) ([]byte, error) {
 	}
 	return d.Sum(nil), nil
 }
+
+// New returns a new hash.Hash computing SHA256.
+func New() hash.Hash {
+	return sha256.New()
+}

pkg/crypto/sha256/sha256block_linux.go

@@ -44,7 +44,7 @@ func blockAVX2(dig *digest, p []byte) {
 	C.sha256_transform_rorx((*C.char)(unsafe.Pointer(&p[0])), (*C.uint32_t)(unsafe.Pointer(&dig.h[0])), (C.ulong)(len(p)/64))
 }
 
-func blockSoftware(dig *digest, p []byte) {
+func blockGeneric(dig *digest, p []byte) {
 	var w [64]uint32
 	h0, h1, h2, h3, h4, h5, h6, h7 := dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7]
 	for len(p) >= chunk {