diff --git a/crypto/blake2b/blake2b.go b/crypto/blake2b/blake2b.go
index 5da50cab6f..97d9ea36ac 100644
--- a/crypto/blake2b/blake2b.go
+++ b/crypto/blake2b/blake2b.go
@@ -302,6 +302,7 @@ func appendUint64(b []byte, x uint64) []byte {
 	return append(b, a[:]...)
 }
 
+//lint:ignore U1000 keep utility function
 func appendUint32(b []byte, x uint32) []byte {
 	var a [4]byte
 	binary.BigEndian.PutUint32(a[:], x)
@@ -313,6 +314,7 @@ func consumeUint64(b []byte) ([]byte, uint64) {
 	return b[8:], x
 }
 
+//lint:ignore U1000 keep utility function
 func consumeUint32(b []byte) ([]byte, uint32) {
 	x := binary.BigEndian.Uint32(b)
 	return b[4:], x
diff --git a/crypto/blake2b/blake2b_generic.go b/crypto/blake2b/blake2b_generic.go
index 35c40cc924..6b310aec47 100644
--- a/crypto/blake2b/blake2b_generic.go
+++ b/crypto/blake2b/blake2b_generic.go
@@ -25,6 +25,7 @@ var precomputed = [10][16]byte{
 	{10, 8, 7, 1, 2, 4, 6, 5, 15, 9, 3, 13, 11, 14, 12, 0},
 }
 
+//lint:ignore U1000 useful on other platforms
 func hashBlocksGeneric(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
 	var m [16]uint64
 	c0, c1 := c[0], c[1]
diff --git a/crypto/blake2b/blake2b_test.go b/crypto/blake2b/blake2b_test.go
index 9e7297da16..9d24444a27 100644
--- a/crypto/blake2b/blake2b_test.go
+++ b/crypto/blake2b/blake2b_test.go
@@ -14,14 +14,6 @@ import (
 	"testing"
 )
 
-func fromHex(s string) []byte {
-	b, err := hex.DecodeString(s)
-	if err != nil {
-		panic(err)
-	}
-	return b
-}
-
 func TestHashes(t *testing.T) {
 	defer func(sse4, avx, avx2 bool) {
 		useSSE4, useAVX, useAVX2 = sse4, avx, avx2
diff --git a/crypto/bn256/cloudflare/gfp_decl.go b/crypto/bn256/cloudflare/gfp_decl.go
index fdea5c11a5..80efb8fca9 100644
--- a/crypto/bn256/cloudflare/gfp_decl.go
+++ b/crypto/bn256/cloudflare/gfp_decl.go
@@ -9,6 +9,7 @@ import (
 	"golang.org/x/sys/cpu"
 )
 
+//lint:ignore U1000 used in asm
 //nolint:varcheck
 var hasBMI2 = cpu.X86.HasBMI2
 
diff --git a/crypto/bn256/cloudflare/optate.go b/crypto/bn256/cloudflare/optate.go
index b71e50e3a2..e8caa7a086 100644
--- a/crypto/bn256/cloudflare/optate.go
+++ b/crypto/bn256/cloudflare/optate.go
@@ -199,9 +199,8 @@ func miller(q *twistPoint, p *curvePoint) *gfP12 {
 	r = newR
 
 	r2.Square(&minusQ2.y)
-	a, b, c, newR = lineFunctionAdd(r, minusQ2, bAffine, r2)
+	a, b, c, _ = lineFunctionAdd(r, minusQ2, bAffine, r2)
 	mulLine(ret, a, b, c)
-	r = newR
 
 	return ret
 }