diff --git a/cmd/tools/vtest-all.v b/cmd/tools/vtest-all.v
index 137dcb361b..4b2adf9e44 100644
--- a/cmd/tools/vtest-all.v
+++ b/cmd/tools/vtest-all.v
@@ -91,7 +91,7 @@ fn get_all_commands() []Command {
 		rmfile: 'examples/hello_world'
 	}
 	res << Command{
-		line:   '${vexe} -W -Wimpure-v run examples/hello_world.v'
+		line:   '${vexe} -W -Wimpure-v examples/hello_world.v'
 		okmsg:  'V can compile hello world with the stricter `-W -Wimpure-v` mode .'
 		rmfile: 'examples/hello_world'
 	}
diff --git a/vlib/v/builder/builder.v b/vlib/v/builder/builder.v
index 0ab091f85b..d9f76c5e06 100644
--- a/vlib/v/builder/builder.v
+++ b/vlib/v/builder/builder.v
@@ -131,6 +131,11 @@ pub fn (mut b Builder) middle_stages() ! {
 
 	b.checker.check_files(b.parsed_files)
 	util.timing_measure('CHECK')
+	$if trace_type_symbols_after_checker ? {
+		for t, s in b.table.type_symbols {
+			println('> t: ${t:10} | s.mod: ${s.mod:-40} | s.name: ${'${s.name#[..30]}':-30} | s.is_builtin: ${s.is_builtin:6} | s.is_pub: ${s.is_pub}')
+		}
+	}
 	if b.pref.dump_defines != '' {
 		b.dump_defines()
 	}
diff --git a/vlib/v/gen/c/testdata/autofree_toml.vv b/vlib/v/gen/c/testdata/autofree_toml.vv
index 42272f8c0d..c4c99cbfc0 100644
--- a/vlib/v/gen/c/testdata/autofree_toml.vv
+++ b/vlib/v/gen/c/testdata/autofree_toml.vv
@@ -2,14 +2,8 @@
 import toml
 import os
 
-fn main() {
-	config_fname := 'config.toml'
-	tab_title := 'test tab title'
-	if !os.exists(config_fname) {
-		mut f := os.create(config_fname) or { panic(err) }
-		f.writeln('tab_title = "${tab_title}"') or { panic(err) }
-		f.close()
-	}
-	doc := toml.parse_file(config_fname) or { panic(err) }
-	assert doc.value('tab_title').string() == tab_title
-}
+config_fname := os.join_path(os.vtmp_dir(), 'config.toml')
+tab_title := 'test tab title'
+os.write_file(config_fname, 'tab_title = "${tab_title}"')!
+doc := toml.parse_file(config_fname)!
+assert doc.value('tab_title').string() == tab_title
diff --git a/vlib/v/gen/native/amd64.v b/vlib/v/gen/native/amd64.v
index 2faac98e25..43606579b3 100644
--- a/vlib/v/gen/native/amd64.v
+++ b/vlib/v/gen/native/amd64.v
@@ -953,7 +953,7 @@ fn (mut c Amd64) lea_var_to_reg(r Register, var_offset i32) {
 
 	is_far_var := var_offset > 0x80 || var_offset < -0x7f
 	match reg {
-		.rax, .rbx, .rsi, .rdi {
+		.rax, .rbx, .rsi, .rdi, .rdx, .rcx {
 			c.g.write8(0x48)
 		}
 		else {}
@@ -2753,6 +2753,7 @@ fn (mut c Amd64) gen_type_promotion(from ast.Type, to ast.Type, option Amd64Regi
 }
 
 fn (mut c Amd64) return_stmt(node ast.Return) {
+	c.g.println('; return statement {')
 	mut s := '?' //${node.exprs[0].val.str()}'
 	if node.exprs.len == 1 {
 		match node.exprs[0] {
@@ -2812,6 +2813,8 @@ fn (mut c Amd64) return_stmt(node ast.Return) {
 								c.add(Amd64Register.rax, size % 8)
 								c.add(Amd64Register.rdx, size % 8)
 								c.mov_deref(Amd64Register.rcx, Amd64Register.rax, ast.i64_type_idx)
+								// TODO: check if it does not write too far as the size of
+								// the remaining data is not 64bits
 								c.mov_store(.rdx, .rcx, ._64)
 							}
 							c.mov_var_to_reg(c.main_reg(), LocalVar{
@@ -2841,7 +2844,14 @@ fn (mut c Amd64) return_stmt(node ast.Return) {
 			offset := c.g.structs[typ.idx()].offsets[i]
 			c.g.expr(expr)
 			// TODO: expr not on rax
-			c.mov_reg_to_var(var, Amd64Register.rax, offset: offset, typ: ts.mr_info().types[i])
+			e_typ := ts.mr_info().types[i]
+			e_ts := c.g.table.sym(e_typ)
+			if e_ts.info is ast.Struct {
+				c.lea_var_to_reg(Amd64Register.rdx, var.offset - offset)
+				c.move_struct(.rdx, .rax, c.g.get_type_size(e_typ))
+			} else {
+				c.mov_reg_to_var(var, Amd64Register.rax, offset: offset, typ: ts.mr_info().types[i])
+			}
 		}
 		// store the multi return struct value
 		c.lea_var_to_reg(Amd64Register.rax, var.offset)
@@ -2897,6 +2907,7 @@ fn (mut c Amd64) return_stmt(node ast.Return) {
 		pos: pos
 	}
 	c.g.println('; jump to label ${label}')
+	c.g.println('; return statement }')
 }
 
 fn (mut c Amd64) multi_assign_stmt(node ast.AssignStmt) {
@@ -2926,7 +2937,7 @@ fn (mut c Amd64) multi_assign_stmt(node ast.AssignStmt) {
 	} else {
 		c.g.expr(node.right[0])
 	}
-	c.mov_reg(Amd64Register.rdx, Amd64Register.rax)
+	c.mov_reg(Amd64Register.rdx, Amd64Register.rax) // value of right expr(s)
 
 	mut current_offset := i32(0)
 	for i, offset in multi_return.offsets {
@@ -2943,7 +2954,7 @@ fn (mut c Amd64) multi_assign_stmt(node ast.AssignStmt) {
 			c.add(Amd64Register.rdx, offset - current_offset)
 			current_offset = offset
 		}
-		c.g.gen_left_value(node.left[i])
+		c.g.gen_left_value(node.left[i]) // in rax
 		left_type := node.left_types[i]
 		right_type := node.right_types[i]
 		if c.g.is_register_type(right_type) {
@@ -3001,11 +3012,36 @@ fn (mut c Amd64) multi_assign_stmt(node ast.AssignStmt) {
 				c.g.println('movsd [rax], xmm0')
 			}
 		} else {
-			c.g.n_error('${@LOCATION} multi return for struct is not supported yet')
+			c.move_struct(.rax, .rdx, c.g.get_type_size(left_type))
 		}
 	}
 }
 
+// Moves a struct of size `_size` (in bytes) from the address stored in input to the address stored in output
+fn (mut c Amd64) move_struct(output Amd64Register, input Amd64Register, _size i32) {
+	mut size := _size
+	for size != 0 {
+		c.mov_deref(Amd64Register.rcx, input, ast.i64_type_idx)
+		// mov_store can only move powers of 2 bytes at once
+		// the remainder will then get handled the next iteration for simplicity
+		data_size := i32(match true {
+			size < 2 { 1 }
+			size < 4 { 2 }
+			size < 8 { 4 }
+			else { 8 }
+		})
+		c.mov_store(output, .rcx, match data_size {
+			1 { ._8 }
+			2 { ._16 }
+			4 { ._32 }
+			else { ._64 }
+		})
+		size -= data_size
+		c.add(output, data_size)
+		c.add(input, data_size)
+	}
+}
+
 fn (mut c Amd64) assign_stmt(node ast.AssignStmt) {
 	// `a, b := foo()`
 	// `a, b := if cond { 1, 2 } else { 3, 4 }`
diff --git a/vlib/v/gen/native/tests/multi_assign.vv b/vlib/v/gen/native/tests/multi_assign.vv
index 42b7b5c6ed..c62eebb0e4 100644
--- a/vlib/v/gen/native/tests/multi_assign.vv
+++ b/vlib/v/gen/native/tests/multi_assign.vv
@@ -61,7 +61,44 @@ fn cross_assign_of_struct_test() { // from cross_assign_test.v
 	assert x.b == 1
 }
 
+struct MyStruct {
+        a int
+        b u64
+        c u16
+        d u8
+}
+
+struct MyStruct2 {
+        a u8
+        b u8
+        c u8
+}
+
+fn struct_multi_return() (int, MyStruct) {
+        return 3, MyStruct{4, 5, 6, 7}
+}
+
+fn struct_multi_return2() (int, MyStruct2) {
+        return 3, MyStruct2{4, 5, 6}
+}
+
+fn struct_multi_return_test() {
+        a, b := struct_multi_return()
+        assert a == 3
+        assert b.a == 4
+        assert b.b == 5
+        assert b.c == 6
+        assert b.d == 7
+
+        c, d := struct_multi_return2()
+        assert c == 3
+        assert d.a == 4
+        assert d.b == 5
+        assert d.c == 6
+}
+
 fn main() {
 	fn_multi_return_test()
 	cross_assign_of_struct_test()
+	struct_multi_return_test()
 }
diff --git a/vlib/x/crypto/ascon/README.md b/vlib/x/crypto/ascon/README.md
index 61a826506c..2191a20605 100644
--- a/vlib/x/crypto/ascon/README.md
+++ b/vlib/x/crypto/ascon/README.md
@@ -1,15 +1,17 @@
 # ascon
 
-`ascon` is a implementation of Ascon-Based Cryptography module implemented in pure V language.
+`ascon` is an implementation of Ascon-Based Cryptography module implemented in pure V language.
 This module was mostly based on NIST Special Publication of 800 NIST SP 800-232 document.
 Its describes an Ascon-Based Lightweight Cryptography Standards for Constrained Devices 
 thats provides Authenticated Encryption, Hash, and Extendable Output Functions.
 See the [NIST.SP.800-232 Standard](https://doi.org/10.6028/NIST.SP.800-232) for more detail.
 
-This module does not fully implements all the features availables on the document.
-Its currently implements:
+This module mostly implements all the features availables on the document.
+It currently implements:
 - `Ascon-Hash256`, Ascon-based hashing implementation that produces 256-bits output.
-- `Ascon-XOF128`, Ascon-based eXtendible Output Function (XOF) where the output size of 
+- `Ascon-XOF128`, Ascon-based eXtendable Output Function (XOF) where the output size of 
 the hash of the message can be selected by the user.
 - `Ascon-CXOF128`, a customized XOF that allows users to specify a customization
 string and choose the output size of the message hash.
+- `Ascon-AEAD128`, an Authenticated Encryption with Additional Data (AEAD) Scheme based
+on Ascon-family crypto.
diff --git a/vlib/x/crypto/ascon/aead128.v b/vlib/x/crypto/ascon/aead128.v
index da215e5e1f..f80cdb2f2b 100644
--- a/vlib/x/crypto/ascon/aead128.v
+++ b/vlib/x/crypto/ascon/aead128.v
@@ -181,7 +181,7 @@ pub fn (mut c Aead128) encrypt(msg []u8, nonce []u8, ad []u8) ![]u8 {
 	c.State.e4 = n1
 
 	// Update state by permutation
-	ascon_pnr(mut c.State, 12)
+	ascon_pnr(mut c.State, ascon_prnd_12)
 	// XOR-ing with the cipher's key
 	c.State.e3 ^= c.key[0]
 	c.State.e4 ^= c.key[1]
@@ -229,7 +229,7 @@ pub fn (mut c Aead128) decrypt(ciphertext []u8, nonce []u8, ad []u8) ![]u8 {
 	c.State.e4 = n1
 
 	// scrambled with permutation routine
-	ascon_pnr(mut c.State, 12)
+	ascon_pnr(mut c.State, ascon_prnd_12)
 	// xor-ing with the cipher's key
 	c.State.e3 ^= c.key[0]
 	c.State.e4 ^= c.key[1]
@@ -288,7 +288,7 @@ fn aead128_init(mut s State, key []u8, nonce []u8) (u64, u64) {
 	s.e4 = n1
 
 	// updates State using the permutation 𝐴𝑠𝑐𝑜𝑛-𝑝[12], S ← 𝐴𝑠𝑐𝑜𝑛-𝑝[12](S)
-	ascon_pnr(mut s, 12)
+	ascon_pnr(mut s, ascon_prnd_12)
 
 	// Then XORing the secret key 𝐾 into the last 128 bits of internal state:
 	// S ← S ⊕ (0¹⁹² ∥ 𝐾).
@@ -312,7 +312,7 @@ fn aead128_process_ad(mut s State, ad []u8) {
 			s.e1 ^= binary.little_endian_u64(block[8..16])
 
 			// Apply permutation 𝐴𝑠𝑐𝑜𝑛-𝑝[8] to the state
-			ascon_pnr(mut s, 8)
+			ascon_pnr(mut s, ascon_prnd_8)
 			// Updates index
 			ad_length -= aead128_block_size
 			ad_idx += aead128_block_size
@@ -339,7 +339,7 @@ fn aead128_process_ad(mut s State, ad []u8) {
 			}
 		}
 		// Apply permutation 𝐴𝑠𝑐𝑜𝑛-𝑝[8] to the state
-		ascon_pnr(mut s, 8)
+		ascon_pnr(mut s, ascon_prnd_8)
 	}
 	// The final step of processing associated data is to update the state
 	// with a constant that provides domain separation.
@@ -361,7 +361,7 @@ fn aead128_process_msg(mut out []u8, mut s State, msg []u8) int {
 		binary.little_endian_put_u64(mut out[pos..pos + 8], s.e0)
 		binary.little_endian_put_u64(mut out[pos + 8..], s.e1)
 		// apply permutation
-		ascon_pnr(mut s, 8)
+		ascon_pnr(mut s, ascon_prnd_8)
 
 		// updates index
 		mlen -= aead128_block_size
@@ -413,7 +413,7 @@ fn aead128_partial_dec(mut out []u8, mut s State, cmsg []u8) {
 		s.e0 = c0
 		s.e1 = c1
 
-		ascon_pnr(mut s, 8)
+		ascon_pnr(mut s, ascon_prnd_8)
 		// updates index
 		pos += aead128_block_size
 		cmsg_len -= aead128_block_size
@@ -448,7 +448,7 @@ fn aead128_finalize(mut s State, k0 u64, k1 u64) {
 	s.e2 ^= k0
 	s.e3 ^= k1
 	// then updated using the permutation 𝐴𝑠𝑐𝑜𝑛-𝑝[12]
-	ascon_pnr(mut s, 12)
+	ascon_pnr(mut s, ascon_prnd_12)
 
 	// Finally, the tag 𝑇 is generated by XORing the key with the last 128 bits of the state:
 	// 𝑇 ← 𝑆[192∶319] ⊕ 𝐾.
diff --git a/vlib/x/crypto/ascon/aead128_test.v b/vlib/x/crypto/ascon/aead128_test.v
index 8d86f6b3be..06dba8a99a 100644
--- a/vlib/x/crypto/ascon/aead128_test.v
+++ b/vlib/x/crypto/ascon/aead128_test.v
@@ -2,8 +2,9 @@
 // Use of this source code is governed by an MIT license
 // that can be found in the LICENSE file.
 //
+module ascon
+
 import encoding.hex
-import x.crypto.ascon
 
 // This test materials was taken and adapted into v from references implementation of Ascon-aead128
 // especially for the known answer test data, but, its not all fully-taken, just randomly choosen item.
@@ -26,14 +27,14 @@ fn test_ascon_aead128_enc_dec() ! {
 		ad := hex.decode(item.ad)!
 		ct := hex.decode(item.ct)!
 
-		out := ascon.encrypt(key, nonce, ad, pt)!
+		out := encrypt(key, nonce, ad, pt)!
 		assert out == ct
 
-		msg := ascon.decrypt(key, nonce, ad, ct)!
+		msg := decrypt(key, nonce, ad, ct)!
 		assert msg == pt
 
 		// Work with object-based Cipher
-		mut c := ascon.new_aead128(key)!
+		mut c := new_aead128(key)!
 		// Lets encrypt the message
 		exp_ct := c.encrypt(msg, nonce, ad)!
 		assert exp_ct == ct
diff --git a/vlib/x/crypto/ascon/ascon.v b/vlib/x/crypto/ascon/ascon.v
index 4f67269607..8bb1b1977a 100644
--- a/vlib/x/crypto/ascon/ascon.v
+++ b/vlib/x/crypto/ascon/ascon.v
@@ -10,6 +10,10 @@ module ascon
 // constants for up to 16 rounds to accommodate potential functionality extensions in the future.
 const max_nr_perm = 16
 
+// The number how many round(s) for the Ascon permutation routine called.
+const ascon_prnd_8 = 8
+const ascon_prnd_12 = 12
+
 // The constants to derive round constants of the Ascon permutations
 // See Table 5. of NIST SP 800-232 docs
 //
@@ -26,72 +30,74 @@ const max_nr_perm = 16
 const rnc = [u8(0x3c), 0x2d, 0x1e, 0x0f, 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87, 0x78,
 	0x69, 0x5a, 0x4b]
 
-// ascon_pnr is ascon permutation routine with specified numbers of round nr, where 1 ≤ nr ≤ 16
+// ascon_pnr is the core of Ascon family permutation routine with specified numbers of round nr, where 1 ≤ nr ≤ 16
+// Its consist of iterations of the round function that is defined as the composition of three steps, ie:
+// 1. the constant-addition layer (see Sec. 3.2),
+// 2. the substitution layer (see Sec.3.3), and,
+// 3. the linear diffusion layer (Sec 3.4)
 @[direct_array_access]
 fn ascon_pnr(mut s State, nr int) {
 	// We dont allow nr == 0
 	if nr < 1 || nr > 16 {
 		panic('Invalid round number')
 	}
+	// Ascon permutation routine
 	for i := max_nr_perm - nr; i < max_nr_perm; i++ {
-		ascon_perm(mut s, rnc[i])
+		// 3.2 Constant-Addition Layer step
+		//
+		// The constant-addition layer adds a 64-bit round constant 𝑐𝑖
+		// to 𝑆₂ in round 𝑖, for 𝑖 ≥ 0, ie, this is equivalent to applying
+		// the constant to only the least significant eight bits of 𝑆₂
+		s.e2 ^= rnc[i]
+
+		// 3.3. Substitution Layer
+		// The substitution layer updates the state S with 64 parallel applications of the 5-bit
+		// substitution box SBOX
+		s.e0 ^= s.e4
+		s.e4 ^= s.e3
+		s.e2 ^= s.e1
+
+		t0 := s.e4 ^ (~s.e0 & s.e1)
+		t1 := s.e0 ^ (~s.e1 & s.e2)
+		t2 := s.e1 ^ (~s.e2 & s.e3)
+		t3 := s.e2 ^ (~s.e3 & s.e4)
+		t4 := s.e3 ^ (~s.e4 & s.e0)
+
+		s.e0 = t1
+		s.e1 = t2
+		s.e2 = t3
+		s.e3 = t4
+		s.e4 = t0
+
+		s.e1 ^= s.e0
+		s.e0 ^= s.e4
+		s.e3 ^= s.e2
+		s.e2 = ~(s.e2)
+
+		// 3.4. Linear Diffusion Layer
+		//
+		// The linear diffusion layer provides diffusion within each 64-bit word S,
+		// defined as :
+		// 		Σ0(𝑆0) = 𝑆0 ⊕ (𝑆0 ⋙ 19) ⊕ (𝑆0 ⋙ 28)
+		// 		Σ1(𝑆1) = 𝑆1 ⊕ (𝑆1 ⋙ 61) ⊕ (𝑆1 ⋙ 39)
+		// 		Σ2(𝑆2) = 𝑆2 ⊕ (𝑆2 ⋙ 1) ⊕ (𝑆2 ⋙ 6)
+		// 		Σ3(𝑆3) = 𝑆3 ⊕ (𝑆3 ⋙ 10) ⊕ (𝑆3 ⋙ 17)
+		// 		Σ4(𝑆4) = 𝑆4 ⊕ (𝑆4 ⋙ 7) ⊕ (𝑆4 ⋙ 41)
+		//
+		// This diffusion layer, especially on the bits right rotation part is a most widely called
+		// for Ascon permutation routine. So, even bits rotation almost efficient on most platform,
+		// to reduce overhead on function call, we work on the raw bits right rotation here.
+		// Bits right rotation, basically can be defined as:
+		// 		ror = (x >> n) | x << (64 - n) for some u64 x
+		//
+		s.e0 ^= (s.e0 >> 19 | (s.e0 << (64 - 19))) ^ (s.e0 >> 28 | (s.e0 << (64 - 28)))
+		s.e1 ^= (s.e1 >> 61 | (s.e1 << (64 - 61))) ^ (s.e1 >> 39 | (s.e1 << (64 - 39)))
+		s.e2 ^= (s.e2 >> 1 | (s.e2 << (64 - 1))) ^ (s.e2 >> 6 | (s.e2 << (64 - 6))) // 	
+		s.e3 ^= (s.e3 >> 10 | (s.e3 << (64 - 10))) ^ (s.e3 >> 17 | (s.e3 << (64 - 17)))
+		s.e4 ^= (s.e4 >> 7 | (s.e4 << (64 - 7))) ^ (s.e4 >> 41 | (s.e4 << (64 - 41)))
 	}
 }
 
-// ascon_perm was the main permutations routine in Ascon-family crypto. Its consist of
-// iterations of the round function that is defined as the composition of three steps, ie:
-// 1. the constant-addition layer (see Sec. 3.2),
-// 2. the substitution layer (see Sec.3.3), and,
-// 3. the linear diffusion layer
-fn ascon_perm(mut s State, c u8) {
-	// 3.2 Constant-Addition Layer step
-	//
-	// The constant-addition layer adds a 64-bit round constant 𝑐𝑖
-	// to 𝑆₂ in round 𝑖, for 𝑖 ≥ 0, ie, this is equivalent to applying
-	// the constant to only the least significant eight bits of 𝑆₂
-	s.e2 ^= c
-
-	// 3.3. Substitution Layer
-	// The substitution layer updates the state S with 64 parallel applications of the 5-bit
-	// substitution box SBOX
-	s.e0 ^= s.e4
-	s.e4 ^= s.e3
-	s.e2 ^= s.e1
-
-	t0 := s.e4 ^ (~s.e0 & s.e1)
-	t1 := s.e0 ^ (~s.e1 & s.e2)
-	t2 := s.e1 ^ (~s.e2 & s.e3)
-	t3 := s.e2 ^ (~s.e3 & s.e4)
-	t4 := s.e3 ^ (~s.e4 & s.e0)
-
-	s.e0 = t1
-	s.e1 = t2
-	s.e2 = t3
-	s.e3 = t4
-	s.e4 = t0
-
-	s.e1 ^= s.e0
-	s.e0 ^= s.e4
-	s.e3 ^= s.e2
-	s.e2 = ~(s.e2)
-
-	// 3.4. Linear Diffusion Layer
-	//
-	// The linear diffusion layer provides diffusion within each 64-bit word S,
-	// defined as :
-	// 		Σ0(𝑆0) = 𝑆0 ⊕ (𝑆0 ⋙ 19) ⊕ (𝑆0 ⋙ 28)
-	// 		Σ1(𝑆1) = 𝑆1 ⊕ (𝑆1 ⋙ 61) ⊕ (𝑆1 ⋙ 39)
-	// 		Σ2(𝑆2) = 𝑆2 ⊕ (𝑆2 ⋙ 1) ⊕ (𝑆2 ⋙ 6)
-	// 		Σ3(𝑆3) = 𝑆3 ⊕ (𝑆3 ⋙ 10) ⊕ (𝑆3 ⋙ 17)
-	// 		Σ4(𝑆4) = 𝑆4 ⊕ (𝑆4 ⋙ 7) ⊕ (𝑆4 ⋙ 41)
-
-	s.e0 ^= ascon_rotate_right(s.e0, 19) ^ ascon_rotate_right(s.e0, 28)
-	s.e1 ^= ascon_rotate_right(s.e1, 61) ^ ascon_rotate_right(s.e1, 39)
-	s.e2 ^= ascon_rotate_right(s.e2, 1) ^ ascon_rotate_right(s.e2, 6)
-	s.e3 ^= ascon_rotate_right(s.e3, 10) ^ ascon_rotate_right(s.e3, 17)
-	s.e4 ^= ascon_rotate_right(s.e4, 7) ^ ascon_rotate_right(s.e4, 41)
-}
-
 // State is structure represents Ascon state. Its operates on the 320-bit opaque,
 // which is represented as five of 64-bit words.
 @[noinit]
diff --git a/vlib/x/crypto/ascon/ascon_test.v b/vlib/x/crypto/ascon/ascon_test.v
index 763aa0c071..ebf5ea0769 100644
--- a/vlib/x/crypto/ascon/ascon_test.v
+++ b/vlib/x/crypto/ascon/ascon_test.v
@@ -5,23 +5,6 @@
 module ascon
 
 // This test mostly taken from https://docs.rs/ascon/latest/src/ascon/lib.rs.html
-fn test_ascon_round_one() {
-	mut s := State{
-		e0: u64(0x0123456789abcdef)
-		e1: 0x23456789abcdef01
-		e2: 0x456789abcdef0123
-		e3: 0x6789abcdef012345
-		e4: 0x89abcde01234567f
-	}
-	ascon_perm(mut s, 0x1f)
-
-	assert s.e0 == u64(0x3c1748c9be2892ce)
-	assert s.e1 == u64(0x5eafb305cd26164f)
-	assert s.e2 == u64(0xf9470254bb3a4213)
-	assert s.e3 == u64(0xf0428daf0c5d3948)
-	assert s.e4 == u64(0x281375af0b294899)
-}
-
 fn test_ascon_round_p6() {
 	mut s := State{
 		e0: u64(0x0123456789abcdef)
diff --git a/vlib/x/crypto/ascon/bench/aead.v b/vlib/x/crypto/ascon/bench/aead.v
new file mode 100644
index 0000000000..c7d1cd1043
--- /dev/null
+++ b/vlib/x/crypto/ascon/bench/aead.v
@@ -0,0 +1,75 @@
+// This benchmark is for Ascon-AEAD128 in `x.crypto.ascon` compared to
+// already stocked `x.crypto.cacha20poly1305 for AEAD functionalities.
+//
+// Here is output in my tests, first item was `x.crypto.ascon` and the later
+// for `x.crypto.chacha20poly1305` on encryption or decryption part.
+//
+// Encryption..
+// -----------
+// Iterations:      10000          Total Duration:   26.008ms      ns/op:       2600       B/op:     16    allocs/op:     17
+// Iterations:      10000          Total Duration:  158.865ms      ns/op:      15886       B/op:     16    allocs/op:     16
+//
+// Decryption..
+// -----------
+// Iterations:      10000          Total Duration:   29.091ms      ns/op:       2909       B/op:      6    allocs/op:      8
+// Iterations:      10000          Total Duration:  158.373ms      ns/op:      15837       B/op:      8    allocs/op:     12
+//
+import encoding.hex
+import x.benchmark
+import x.crypto.ascon
+import x.crypto.chacha20poly1305
+
+// randomly generated key and nonce, 16-bytes of ascon key and 32-bytes of chacha20poly1305 key.
+const key_ascon = hex.decode('7857bfb462c654d1d1b02971be021235')!
+const key_cpoly = hex.decode('9d9603f4fc460e273b80795ea50eab5873c04f589226c7d591b5336feb32fcba')!
+
+// 16-bytes ascon-nonce
+const ascon_nonce = hex.decode('8b521028fb54591472d8d8ee14430835')!
+
+// 12-bytes chacha20poly1305 nonce
+const cpoly_nonce = hex.decode('9a3c83e4236ea9a2c4e482da')!
+
+const ad = 'Ascon-AEAD128 additional data'.bytes()
+const msg = 'Ascon-AEAD128 benchmarking message'.bytes()
+
+// expected ciphertext for aead128 := 4b21a18cbca65b11aaf73dc74241c89bfcec96a4c8973ae696a938e0a591e846c4eb7b2906664f2318c0fd6ec1c56424aa9b
+const ciphertext_aead128 = hex.decode('4b21a18cbca65b11aaf73dc74241c89bfcec96a4c8973ae696a938e0a591e846c4eb7b2906664f2318c0fd6ec1c56424aa9b')!
+
+fn bench_ascon_aead128_encrypt() ! {
+	_ := ascon.encrypt(key_ascon, ascon_nonce, ad, msg)!
+}
+
+fn bench_ascon_aead128_decrypt() ! {
+	_ := ascon.decrypt(key_ascon, ascon_nonce, ad, ciphertext_aead128)!
+}
+
+// expected ciphertext for chacha20poly1305
+const ciphertext_chachapoly1305 = hex.decode('67dea3c65f0f326bcf587f024140a85d9535790d9b16129210a2289eda43bb9b62746450026fc1baf466bcb8a181843cd424')!
+
+fn bench_chacha20poly1305_encrypt() ! {
+	_ := chacha20poly1305.encrypt(msg, key_cpoly, cpoly_nonce, ad)!
+}
+
+fn bench_chacha20poly1305_decrypt() ! {
+	_ := chacha20poly1305.decrypt(ciphertext_chachapoly1305, key_cpoly, cpoly_nonce, ad)!
+}
+
+fn main() {
+	cf := benchmark.BenchmarkDefaults{
+		n: 10000
+	}
+	println('Encryption..')
+	println('-----------')
+	mut b0 := benchmark.setup(bench_ascon_aead128_encrypt, cf)!
+	b0.run()
+	mut b1 := benchmark.setup(bench_chacha20poly1305_encrypt, cf)!
+	b1.run()
+
+	println('')
+	println('Decryption..')
+	println('-----------')
+	mut b2 := benchmark.setup(bench_ascon_aead128_decrypt, cf)!
+	b2.run()
+	mut b3 := benchmark.setup(bench_chacha20poly1305_decrypt, cf)!
+	b3.run()
+}
diff --git a/vlib/x/crypto/ascon/bench/hashxof.v b/vlib/x/crypto/ascon/bench/hashxof.v
new file mode 100644
index 0000000000..6b7ec6ce54
--- /dev/null
+++ b/vlib/x/crypto/ascon/bench/hashxof.v
@@ -0,0 +1,197 @@
+// Ascon-Hash256 (and Ascon-XOF128) benchmark compared to builtin
+// crypto.sha256 (for sum256) and sha3.shake256 (for xof outputing 256-bits)
+//
+// This benchmark code was adapted from argon2 benchmark by @fleximus, the creator argon2 module.
+// Credit tributed to @fleximus
+// See https://gist.github.com/fleximus/db5b867a9a37da46340db61bdac6e696
+//
+// Output
+// ======
+// Sum and Xof 256-bits output performance comparison
+// ============================================================
+// Iterations per test: 10000
+// --------------------------------------------------------------------------------------------------
+//   Data Size |   Ascon256 |     Sha256 |    Ratio 256 || AsconXof128 |   Shake256 |  Ratio (Xof) |
+// --------------------------------------------------------------------------------------------------
+//         4 B |    24.00ms |    33.00ms |        0.73x ||     24.00ms |   208.00ms |        0.12x |
+//         6 B |    23.00ms |    53.00ms |        0.45x ||     25.00ms |   287.00ms |        0.08x |
+//         8 B |    35.00ms |    37.00ms |        0.95x ||     26.00ms |   202.00ms |        0.18x |
+//        16 B |    30.00ms |    37.00ms |        0.83x ||     30.00ms |   205.00ms |        0.15x |
+//        64 B |    55.00ms |    61.00ms |        0.89x ||     53.00ms |   241.00ms |        0.23x |
+//        75 B |    61.00ms |    57.00ms |        1.07x ||     58.00ms |   182.00ms |        0.34x |
+//       256 B |   154.00ms |   123.00ms |        1.25x ||    144.00ms |   398.00ms |        0.39x |
+//       512 B |   273.00ms |   216.00ms |        1.26x ||    265.00ms |   779.00ms |        0.35x |
+//      1025 B |   610.00ms |   401.00ms |        1.52x ||    509.00ms |      1.37s |        0.45x |
+// --------------------------------------------------------------------------------------------------
+//       Total |      1.27s |      1.02s |        1.24x ||      1.14s |      3.87s |         0.294x|
+// --------------------------------------------------------------------------------------------------
+//
+// Per-operation averages:
+//   Ascon256:         14108 ns per hash
+//   Sha256:           11360 ns per hash
+//   AsconXof128:      12648 ns per hash
+//   Shake256:         43036 ns per hash
+//
+module main
+
+import time
+import crypto.sha3
+import crypto.sha256
+import x.crypto.ascon
+
+const benchmark_iterations = 10000
+
+// We include more small size because, Ascon-Hash256 working with more smaller block size.
+const test_data_sizes = [
+	4, // below Ascon-Hash256 block size
+	6, // Still below Ascon-Hash256 block size
+	8, // align with Ascon-Hash256 block size
+	16, // Small data
+	64, // Medium data
+	75, // above 64-bytes block
+	256, // Large data
+	512,
+	1025,
+]
+
+fn generate_test_data(size int) []u8 {
+	mut data := []u8{len: size}
+	for i in 0 .. size {
+		data[i] = u8(i % 256)
+	}
+	return data
+}
+
+fn benchmark_ascon_sha256(data []u8, iterations int) time.Duration {
+	start := time.now()
+	for _ in 0 .. iterations {
+		_ := ascon.sum256(data)
+	}
+	return time.since(start)
+}
+
+fn benchmark_sha256_sum256(data []u8, iterations int) time.Duration {
+	start := time.now()
+	for _ in 0 .. iterations {
+		_ := sha256.sum256(data)
+	}
+	return time.since(start)
+}
+
+// for eXtendable output functions (XOF)
+fn benchmark_ascon_xof128_32(data []u8, iterations int) time.Duration {
+	start := time.now()
+	for _ in 0 .. iterations {
+		_ := ascon.xof128(data, 32) or { panic(err) }
+	}
+	return time.since(start)
+}
+
+fn benchmark_sha3_shake256(data []u8, iterations int) time.Duration {
+	start := time.now()
+	for _ in 0 .. iterations {
+		_ := sha3.shake256(data, 32)
+	}
+	return time.since(start)
+}
+
+fn format_duration(d time.Duration) string {
+	if d.microseconds() < 1000 {
+		return '${d.microseconds():6}μs'
+	} else if d.milliseconds() < 1000 {
+		return '${f64(d.milliseconds()):6.2f}ms'
+	} else {
+		return '${f64(d.seconds()):6.2f}s'
+	}
+}
+
+const data_title = 'Data Size'
+const ascon_sum256_title = 'Ascon256'
+const sha256_title = 'Sha256'
+const ascon_xof128_title = 'AsconXof128'
+const sha3_shake256_title = 'Shake256'
+const ratio_ascon256_w_sha256 = 'Ratio 256'
+const ratio_asconxof128_w_shake256 = 'Ratio (Xof)'
+
+fn main() {
+	println('')
+	println('Sum and Xof 256-bits output performance comparison')
+	println('============================================================')
+	println('Iterations per test: ${benchmark_iterations}')
+
+	println('${'-'.repeat(98)}')
+	println('${data_title:12} | ${ascon_sum256_title:10} | ${sha256_title:10} | ${ratio_ascon256_w_sha256:12} || ${ascon_xof128_title:10} | ${sha3_shake256_title:10} | ${ratio_asconxof128_w_shake256:12} |')
+	println('${'-'.repeat(98)}')
+
+	mut total_ascon256 := time.Duration(0)
+	mut total_sha256 := time.Duration(0)
+	mut total_shake256 := time.Duration(0)
+	mut total_asconxof128 := time.Duration(0)
+
+	for size in test_data_sizes {
+		test_data := generate_test_data(size)
+
+		// Warm up
+		_ := ascon.sum256(test_data)
+		_ := sha256.sum256(test_data)
+
+		_ := ascon.xof128(test_data, 32)!
+		_ := sha3.shake256(test_data, 32)
+
+		// Benchmark Ascon-HASH256
+		ascon256_time := benchmark_ascon_sha256(test_data, benchmark_iterations)
+
+		// Benchmark Sha256 implementation
+		sha256_time := benchmark_sha256_sum256(test_data, benchmark_iterations)
+
+		// Benchmark Sha3 shake256 implementation
+		shake256_time := benchmark_sha3_shake256(test_data, benchmark_iterations)
+
+		// Benchmark AsconXof128 256-bits output
+		asconxof128_time := benchmark_ascon_xof128_32(test_data, benchmark_iterations)
+
+		// Calculate ratio ascon256 / sha256
+		ratio_ascon256_sha256 := f64(ascon256_time.nanoseconds()) / f64(sha256_time.nanoseconds())
+
+		// Calculate ratio asconxof128 / shake256
+		ratio_asconxof128_shake256 := f64(asconxof128_time.nanoseconds()) / f64(shake256_time.nanoseconds())
+
+		ascon256_str := format_duration(ascon256_time)
+		sha256_str := format_duration(sha256_time)
+		asconxof128_str := format_duration(asconxof128_time)
+		shake256_str := format_duration(shake256_time)
+
+		ratio_ascon256_sha256_str := '${ratio_ascon256_sha256:6.2f}x'
+		ratio_asconxof128_shake256_str := '${ratio_asconxof128_shake256:6.2f}x'
+
+		println('${size:10} B | ${ascon256_str:10} | ${sha256_str:10} | ${ratio_ascon256_sha256_str:12} || ${asconxof128_str:11} | ${shake256_str:10} | ${ratio_asconxof128_shake256_str:12} |')
+
+		total_ascon256 += ascon256_time
+		total_sha256 += sha256_time
+
+		total_asconxof128 += asconxof128_time
+		total_shake256 += shake256_time
+	}
+
+	println('${'-'.repeat(98)}')
+
+	// Overall performance comparison
+	overall_ascon256_w_sha256_ratio := f64(total_ascon256.nanoseconds()) / f64(total_sha256.nanoseconds())
+	overall_asconxof128_w_shake256_ratio := f64(total_asconxof128.nanoseconds()) / f64(total_shake256.nanoseconds())
+	total_title := 'Total'
+	println('${total_title:12} | ${format_duration(total_ascon256):10} | ${format_duration(total_sha256):10} | ${overall_ascon256_w_sha256_ratio:11.2f}x || ${format_duration(total_asconxof128):11} | ${format_duration(total_shake256):10} | ${overall_asconxof128_w_shake256_ratio:12.2f}x|')
+	println('${'-'.repeat(98)}')
+
+	println('')
+	println('Per-operation averages:')
+	avg_ascon256 := total_ascon256.nanoseconds() / (benchmark_iterations * test_data_sizes.len)
+	avg_sha256 := total_sha256.nanoseconds() / (benchmark_iterations * test_data_sizes.len)
+	avg_shake256 := total_shake256.nanoseconds() / (benchmark_iterations * test_data_sizes.len)
+	avg_asconxof128 := total_asconxof128.nanoseconds() / (benchmark_iterations * test_data_sizes.len)
+
+	println('  Ascon256:\t ${avg_ascon256:8} ns per hash')
+	println('  Sha256:\t ${avg_sha256:8} ns per hash')
+	println('  AsconXof128:\t ${avg_asconxof128:8} ns per hash')
+	println('  Shake256:\t ${avg_shake256:8} ns per hash')
+	println('')
+}
diff --git a/vlib/x/crypto/ascon/bench/sum.v b/vlib/x/crypto/ascon/bench/sum.v
new file mode 100644
index 0000000000..3739d0efff
--- /dev/null
+++ b/vlib/x/crypto/ascon/bench/sum.v
@@ -0,0 +1,36 @@
+import time
+import x.crypto.ascon
+
+// Before:
+// Benchmarking ascon.sum256 ...
+// Average ascon.sum256 time: 8 µs
+// Benchmarking ascon.sum256 ...
+// Average ascon.sum256 time: 6 µs
+
+// For xof128 (32 bytes)
+// Benchmarking ascon.xof128 ...
+// Average ascon.xof128 time: 7 µs
+// Benchmarking ascon.xof128 ...
+// Average ascon.xof128 time: 6 µs
+
+// For cxof128 32 bytes
+// Benchmarking ascon.cxof128 ...
+// Average ascon.cxof128 time: 9 µs
+// Benchmarking ascon.sum256 ...
+// Average ascon.cxof128 time: 7 µs
+//
+fn main() {
+	iterations := 1000
+	msg := [u8(0xff)].repeat(100)
+
+	println('Benchmarking ascon.sum256 ...')
+	mut total_sum_time := i64(0)
+	for _ in 0 .. iterations {
+		sw := time.new_stopwatch()
+		_ := ascon.sum256(msg)
+		elapsed := sw.elapsed().microseconds()
+		total_sum_time += elapsed
+	}
+	avg_sum_time := total_sum_time / iterations
+	println('Average ascon.sum256 time: ${avg_sum_time} µs')
+}
diff --git a/vlib/x/crypto/ascon/digest.v b/vlib/x/crypto/ascon/digest.v
index 0b9a6db98d..89a7dac7e1 100644
--- a/vlib/x/crypto/ascon/digest.v
+++ b/vlib/x/crypto/ascon/digest.v
@@ -33,7 +33,7 @@ fn (mut d Digest) finish() {
 	d.State.e0 ^= load_bytes(d.buf[..d.length], d.length)
 
 	// Permutation step was done in squeezing-phase
-	// ascon_pnr(mut d.State, 12)
+	// ascon_pnr(mut d.State, ascon_prnd_12)
 
 	// zeroing Digest buffer
 	d.length = 0
@@ -70,7 +70,7 @@ fn (mut d Digest) absorb(msg_ []u8) int {
 				// If this d.buf length has reached block_size bytes, absorb it.
 				if d.length == block_size {
 					d.State.e0 ^= binary.little_endian_u64(d.buf)
-					ascon_pnr(mut d.State, 12)
+					ascon_pnr(mut d.State, ascon_prnd_12)
 					// reset the internal buffer
 					d.length = 0
 					d.buf.reset()
@@ -87,7 +87,7 @@ fn (mut d Digest) absorb(msg_ []u8) int {
 		for msg.len >= block_size {
 			d.State.e0 ^= binary.little_endian_u64(msg[0..block_size])
 			msg = msg[block_size..]
-			ascon_pnr(mut d.State, 12)
+			ascon_pnr(mut d.State, ascon_prnd_12)
 		}
 		// If there are partial block, just stored into buffer.
 		if msg.len > 0 {
@@ -113,14 +113,14 @@ fn (mut d Digest) squeeze(mut dst []u8) int {
 	}
 	// The squeezing phase begins after msg is absorbed with an
 	// permutation 𝐴𝑠𝑐𝑜𝑛-𝑝[12] to the state:
-	ascon_pnr(mut d.State, 12)
+	ascon_pnr(mut d.State, ascon_prnd_12)
 
 	mut pos := 0
 	mut clen := dst.len
 	// process for full block size
 	for clen >= block_size {
 		binary.little_endian_put_u64(mut dst[pos..pos + 8], d.State.e0)
-		ascon_pnr(mut d.State, 12)
+		ascon_pnr(mut d.State, ascon_prnd_12)
 		pos += block_size
 		clen -= block_size
 	}
@@ -133,3 +133,39 @@ fn (mut d Digest) squeeze(mut dst []u8) int {
 
 	return pos
 }
+
+@[direct_array_access; inline]
+fn ascon_generic_hash(mut s State, msg_ []u8, size int) []u8 {
+	// Assumed state was correctly initialized
+	// Absorbing the message
+	mut msg := msg_.clone()
+	for msg.len >= block_size {
+		s.e0 ^= binary.little_endian_u64(msg[0..block_size])
+		unsafe {
+			msg = msg[block_size..]
+		}
+		ascon_pnr(mut s, ascon_prnd_12)
+	}
+	// Absorb the last partial message block
+	s.e0 ^= load_bytes(msg, msg.len)
+	s.e0 ^= pad(msg.len)
+
+	// Squeezing phase
+	//
+	// The squeezing phase begins after msg is absorbed with an
+	// permutation 𝐴𝑠𝑐𝑜𝑛-𝑝[12] to the state:
+	ascon_pnr(mut s, ascon_prnd_12)
+	mut out := []u8{len: size}
+	mut pos := 0
+	mut clen := out.len
+	for clen >= block_size {
+		binary.little_endian_put_u64(mut out[pos..pos + 8], s.e0)
+		ascon_pnr(mut s, ascon_prnd_12)
+		pos += block_size
+		clen -= block_size
+	}
+	// final output, the resulting 256-bit digest is the concatenation of hash blocks
+	store_bytes(mut out[pos..], s.e0, clen)
+
+	return out
+}
diff --git a/vlib/x/crypto/ascon/hash.v b/vlib/x/crypto/ascon/hash.v
index 2ec0dda97e..60c02af506 100644
--- a/vlib/x/crypto/ascon/hash.v
+++ b/vlib/x/crypto/ascon/hash.v
@@ -42,13 +42,13 @@ const hash256_initial_state = State{
 }
 
 // sum256 creates an Ascon-Hash256 checksum for bytes on msg and produces a 256-bit hash.
-pub fn sum256(msg []u8) []u8 {
-	mut h := new_hash256()
-	_ := h.write(msg) or { panic(err) }
-	h.Digest.finish()
-	mut dst := []u8{len: hash256_size}
-	_ := h.Digest.squeeze(mut dst)
-	return dst
+pub fn sum256(msg_ []u8) []u8 {
+	// This is single-shot function, so, no need to use Hash256 opaque that process
+	// message in streaming way. To reduce this overhead, use raw processing instead.
+	//
+	// Initialize state
+	mut s := hash256_initial_state
+	return ascon_generic_hash(mut s, msg_, hash256_size)
 }
 
 // Hash256 is an opaque provides an implementation of Ascon-Hash256 from NIST.SP.800-232 standard.
diff --git a/vlib/x/crypto/ascon/util.v b/vlib/x/crypto/ascon/util.v
index dd123e4a84..345683ea66 100644
--- a/vlib/x/crypto/ascon/util.v
+++ b/vlib/x/crypto/ascon/util.v
@@ -5,15 +5,8 @@
 // Utility helpers used across the module
 module ascon
 
-import math.bits
 import encoding.binary
 
-// rotate_right_64 rotates x right by k bits
-fn rotate_right_64(x u64, k int) u64 {
-	// call rotate_left_64(x, -k).
-	return bits.rotate_left_64(x, -k)
-}
-
 // clear_bytes clears the bytes of x in n byte
 @[inline]
 fn clear_bytes(x u64, n int) u64 {
@@ -100,8 +93,3 @@ fn store_bytes(mut out []u8, x u64, n int) {
 		out[i] = get_byte(x, i)
 	}
 }
-
-@[inline]
-fn ascon_rotate_right(x u64, n int) u64 {
-	return (x >> n) | x << (64 - n)
-}
diff --git a/vlib/x/crypto/ascon/xof.v b/vlib/x/crypto/ascon/xof.v
index c6d48ce149..eea14e35f1 100644
--- a/vlib/x/crypto/ascon/xof.v
+++ b/vlib/x/crypto/ascon/xof.v
@@ -30,13 +30,11 @@ const xof128_initial_state = State{
 
 // xof128 creates an Ascon-XOF128 checksum of msg with specified desired size of output.
 pub fn xof128(msg []u8, size int) ![]u8 {
-	mut x := new_xof128(size)
-	_ := x.write(msg)!
-	x.Digest.finish()
-	mut out := []u8{len: size}
-	_ := x.Digest.squeeze(mut out)
-	x.reset()
-	return out
+	if size > max_hash_size {
+		return error('xof128: invalid size')
+	}
+	mut s := xof128_initial_state
+	return ascon_generic_hash(mut s, msg, size)
 }
 
 // xof128_64 creates a 64-bytes of Ascon-XOF128 checksum of msg.
@@ -170,13 +168,10 @@ const cxof128_initial_state = State{
 
 // cxof128 creates an Ascon-CXOF128 checksum of msg with supplied size and custom string cs.
 pub fn cxof128(msg []u8, size int, cs []u8) ![]u8 {
-	mut cx := new_cxof128(size, cs)!
-	_ := cx.write(msg)!
-	cx.Digest.finish()
-	mut out := []u8{len: size}
-	_ := cx.Digest.squeeze(mut out)
-	cx.reset()
-	return out
+	// Initialize CXof128 state with precomputed-value and absorb the customization string
+	mut s := cxof128_initial_state
+	cxof128_absorb_custom_string(mut s, cs)
+	return ascon_generic_hash(mut s, msg, size)
 }
 
 // cxof128_64 creates a 64-bytes of Ascon-CXOF128 checksum of msg with supplied custom string in cs.
@@ -305,7 +300,7 @@ pub fn (mut x CXof128) free() {
 fn cxof128_absorb_custom_string(mut s State, cs []u8) {
 	// absorb Z0, the length of the customization string (in bits) encoded as a u64
 	s.e0 ^= u64(cs.len) << 3
-	ascon_pnr(mut s, 12)
+	ascon_pnr(mut s, ascon_prnd_12)
 
 	// absorb the customization string
 	mut zlen := cs.len
@@ -313,7 +308,7 @@ fn cxof128_absorb_custom_string(mut s State, cs []u8) {
 	for zlen >= block_size {
 		block := unsafe { cs[zidx..zidx + block_size] }
 		s.e0 ^= binary.little_endian_u64(block)
-		ascon_pnr(mut s, 12)
+		ascon_pnr(mut s, ascon_prnd_12)
 
 		// updates a index
 		zlen -= block_size
@@ -323,5 +318,5 @@ fn cxof128_absorb_custom_string(mut s State, cs []u8) {
 	last_block := unsafe { cs[zidx..] }
 	s.e0 ^= load_bytes(last_block, last_block.len)
 	s.e0 ^= pad(last_block.len)
-	ascon_pnr(mut s, 12)
+	ascon_pnr(mut s, ascon_prnd_12)
 }