diff --git a/Cargo.lock b/Cargo.lock
index edb865ee..18280f3c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -70,6 +70,7 @@ dependencies = [
 name = "anchor-attribute-account"
 version = "0.21.0"
 dependencies = [
+ "anchor-common",
  "anchor-syn",
  "anyhow",
  "bs58 0.4.0",
@@ -102,6 +103,7 @@ dependencies = [
 name = "anchor-attribute-event"
 version = "0.21.0"
 dependencies = [
+ "anchor-common",
  "anchor-syn",
  "anyhow",
  "proc-macro2 1.0.32",
@@ -190,6 +192,14 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "anchor-common"
+version = "0.21.0"
+dependencies = [
+ "arrayref",
+ "solana-program",
+]
+
 [[package]]
 name = "anchor-derive-accounts"
 version = "0.21.0"
@@ -213,6 +223,7 @@ dependencies = [
  "anchor-attribute-interface",
  "anchor-attribute-program",
  "anchor-attribute-state",
+ "anchor-common",
  "anchor-derive-accounts",
  "arrayref",
  "base64 0.13.0",
@@ -239,6 +250,7 @@ name = "anchor-syn"
 version = "0.21.0"
 dependencies = [
  "anyhow",
+ "arrayref",
  "bs58 0.3.1",
  "heck 0.3.3",
  "proc-macro2 1.0.32",
@@ -247,6 +259,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2",
+ "solana-program",
  "syn 1.0.81",
  "thiserror",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 6d7db428..5220fa42 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ members = [
     "client",
     "lang",
     "lang/attribute/*",
+    "lang/common",
     "lang/derive/*",
     "lang/syn",
     "spl",
diff --git a/lang/Cargo.toml b/lang/Cargo.toml
index d8dd796f..9991653e 100644
--- a/lang/Cargo.toml
+++ b/lang/Cargo.toml
@@ -34,6 +34,7 @@ anchor-attribute-state = { path = "./attribute/state", version = "0.21.0" }
 anchor-attribute-interface = { path = "./attribute/interface", version = "0.21.0" }
 anchor-attribute-event = { path = "./attribute/event", version = "0.21.0" }
 anchor-derive-accounts = { path = "./derive/accounts", version = "0.21.0" }
+anchor-common = { path = "./common", version = "0.21.0" }
 arrayref = "0.3.6"
 base64 = "0.13.0"
 borsh = "0.9"
diff --git a/lang/attribute/account/Cargo.toml b/lang/attribute/account/Cargo.toml
index 60c54514..d45fa516 100644
--- a/lang/attribute/account/Cargo.toml
+++ b/lang/attribute/account/Cargo.toml
@@ -19,5 +19,6 @@ quote = "1.0"
 syn = { version = "1.0.60", features = ["full"] }
 anyhow = "1.0.32"
 anchor-syn = { path = "../../syn", version = "0.21.0", features = ["hash"] }
+anchor-common = { path = "../../common", version = "0.21.0" }
 rustversion = "1.0.3"
-bs58 = "0.4.0"
\ No newline at end of file
+bs58 = "0.4.0"
diff --git a/lang/attribute/account/src/lib.rs b/lang/attribute/account/src/lib.rs
index ff169eca..87bda554 100644
--- a/lang/attribute/account/src/lib.rs
+++ b/lang/attribute/account/src/lib.rs
@@ -104,41 +104,19 @@ pub fn account(
     };
 
     let discriminator: proc_macro2::TokenStream = {
-        // Namespace the discriminator to prevent collisions.
-        let discriminator_preimage = {
-            // For now, zero copy accounts can't be namespaced.
+        let discriminator = anchor_common::header::create_discriminator(
+            &account_name.to_string(),
             if namespace.is_empty() {
-                format!("account:{}", account_name)
+                None
             } else {
-                format!("{}:{}", namespace, account_name)
-            }
-        };
-
-        if cfg!(feature = "deprecated-layout") {
-            let mut discriminator = [0u8; 8];
-            discriminator.copy_from_slice(
-                &anchor_syn::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..8],
-            );
-            format!("{:?}", discriminator).parse().unwrap()
-        } else {
-            let mut discriminator = [0u8; 4];
-            discriminator.copy_from_slice(
-                &anchor_syn::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..4],
-            );
-            format!("{:?}", discriminator).parse().unwrap()
-        }
+                Some(&namespace)
+            },
+        );
+        format!("{:?}", discriminator).parse().unwrap()
     };
 
-    let disc_bytes = {
-        if cfg!(feature = "deprecated-layout") {
-            quote! {
-                let given_disc = &buf[..8];
-            }
-        } else {
-            quote! {
-                let given_disc = &buf[2..6];
-            }
-        }
+    let disc_bytes = quote! {
+        let given_disc = anchor_lang::accounts::header::read_discriminator(&buf);
     };
 
     let disc_fn = {
diff --git a/lang/attribute/event/Cargo.toml b/lang/attribute/event/Cargo.toml
index f7fc57c0..e0dbbddb 100644
--- a/lang/attribute/event/Cargo.toml
+++ b/lang/attribute/event/Cargo.toml
@@ -19,3 +19,4 @@ quote = "1.0"
 syn = { version = "1.0.60", features = ["full"] }
 anyhow = "1.0.32"
 anchor-syn = { path = "../../syn", version = "0.21.0", features = ["hash"] }
+anchor-common = { path = "../../common", version = "0.21.0" }
diff --git a/lang/attribute/event/src/lib.rs b/lang/attribute/event/src/lib.rs
index 8035404b..ad27d78f 100644
--- a/lang/attribute/event/src/lib.rs
+++ b/lang/attribute/event/src/lib.rs
@@ -17,24 +17,8 @@ pub fn event(
     let event_name = &event_strct.ident;
 
     let discriminator: proc_macro2::TokenStream = {
-        let discriminator_preimage = format!("event:{}", event_name);
-
-        #[cfg(feature = "deprecated-layout")]
-        let discriminator = {
-            let mut discriminator = [0u8; 8];
-            discriminator.copy_from_slice(
-                &anchor_syn::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..8],
-            );
-            discriminator
-        };
-        #[cfg(not(feature = "deprecated-layout"))]
-        let discriminator = {
-            let mut discriminator = [0u8; 4];
-            discriminator.copy_from_slice(
-                &anchor_syn::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..4],
-            );
-            discriminator
-        };
+        let discriminator =
+            anchor_common::header::create_discriminator(&event_name.to_string(), Some("event"));
         format!("{:?}", discriminator).parse().unwrap()
     };
 
diff --git a/lang/common/Cargo.toml b/lang/common/Cargo.toml
new file mode 100644
index 00000000..1c475aa1
--- /dev/null
+++ b/lang/common/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "anchor-common"
+version = "0.21.0"
+authors = ["Serum Foundation <foundation@projectserum.com>"]
+repository = "https://github.com/project-serum/anchor"
+license = "Apache-2.0"
+description = "Common utilities for internal anchor lang crates"
+edition = "2018"
+
+[features]
+default = []
+
+[dependencies]
+arrayref = "0.3.6"
+solana-program = "1.8.5"
diff --git a/lang/src/accounts/header.rs b/lang/common/src/header.rs
similarity index 60%
rename from lang/src/accounts/header.rs
rename to lang/common/src/header.rs
index 4a425002..12e5aa0f 100644
--- a/lang/src/accounts/header.rs
+++ b/lang/common/src/header.rs
@@ -1,4 +1,6 @@
 use arrayref::array_ref;
+use solana_program::hash;
+use std::io::{Cursor, Write};
 
 #[cfg(feature = "deprecated-layout")]
 pub fn read_discriminator(data: &[u8]) -> &[u8; 8] {
@@ -14,9 +16,7 @@ pub fn read_discriminator(data: &[u8]) -> &[u8; 4] {
 pub fn create_discriminator(account_name: &str, namespace: Option<&str>) -> [u8; 8] {
     let discriminator_preimage = format!("{}:{}", namespace.unwrap_or("account"), account_name);
     let mut discriminator = [0u8; 8];
-    discriminator.copy_from_slice(
-        &crate::solana_program::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..8],
-    );
+    discriminator.copy_from_slice(&hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..8]);
     discriminator
 }
 
@@ -24,9 +24,7 @@ pub fn create_discriminator(account_name: &str, namespace: Option<&str>) -> [u8;
 pub fn create_discriminator(account_name: &str, namespace: Option<&str>) -> [u8; 4] {
     let discriminator_preimage = format!("{}:{}", namespace.unwrap_or("account"), account_name);
     let mut discriminator = [0u8; 4];
-    discriminator.copy_from_slice(
-        &crate::solana_program::hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..4],
-    );
+    discriminator.copy_from_slice(&hash::hash(discriminator_preimage.as_bytes()).to_bytes()[..4]);
     discriminator
 }
 
@@ -38,3 +36,17 @@ pub fn read_data(account_data: &[u8]) -> &[u8] {
 pub fn read_data_mut(account_data: &mut [u8]) -> &mut [u8] {
     &mut account_data[8..]
 }
+
+pub fn write_discriminator(account_data: &mut [u8], discriminator: &[u8]) {
+    #[cfg(feature = "deprecated_layout")]
+    {
+        let mut cursor = Cursor::new(account_dst);
+        cursor.write_all(discriminator).unwrap();
+    }
+    #[cfg(not(feature = "deprecated_layout"))]
+    {
+        let dst: &mut [u8] = &mut account_data[2..];
+        let mut cursor = Cursor::new(dst);
+        cursor.write_all(discriminator).unwrap();
+    }
+}
diff --git a/lang/common/src/lib.rs b/lang/common/src/lib.rs
new file mode 100644
index 00000000..f505d688
--- /dev/null
+++ b/lang/common/src/lib.rs
@@ -0,0 +1 @@
+pub mod header;
diff --git a/lang/src/accounts/mod.rs b/lang/src/accounts/mod.rs
index c94ff360..facd04ff 100644
--- a/lang/src/accounts/mod.rs
+++ b/lang/src/accounts/mod.rs
@@ -10,7 +10,6 @@ pub mod cpi_account;
 #[doc(hidden)]
 #[allow(deprecated)]
 pub mod cpi_state;
-pub mod header;
 #[doc(hidden)]
 #[allow(deprecated)]
 pub mod loader;
@@ -25,3 +24,5 @@ pub mod state;
 pub mod system_account;
 pub mod sysvar;
 pub mod unchecked_account;
+
+pub use anchor_common::header;
diff --git a/lang/syn/Cargo.toml b/lang/syn/Cargo.toml
index ee98c347..427430df 100644
--- a/lang/syn/Cargo.toml
+++ b/lang/syn/Cargo.toml
@@ -16,6 +16,7 @@ anchor-debug = []
 seeds = []
 
 [dependencies]
+arrayref = "0.3.6"
 proc-macro2 = "1.0"
 proc-macro2-diagnostics = "0.9"
 quote = "1.0"
@@ -25,5 +26,6 @@ heck = "0.3.1"
 serde = { version = "1.0.122", features = ["derive"] }
 serde_json = "1.0"
 sha2 = "0.9.2"
+solana-program = "1.8.5"
 thiserror = "1.0"
 bs58 = "0.3.1"
diff --git a/lang/syn/src/codegen/accounts/constraints.rs b/lang/syn/src/codegen/accounts/constraints.rs
index ccda5edc..9b0c723f 100644
--- a/lang/syn/src/codegen/accounts/constraints.rs
+++ b/lang/syn/src/codegen/accounts/constraints.rs
@@ -147,23 +147,10 @@ pub fn generate_constraint_zeroed(f: &Field, _c: &ConstraintZeroed) -> proc_macr
     let ty_decl = f.ty_decl();
     let account_ty = f.account_ty();
     let from_account_info = f.from_account_info(None);
-    let header_write = {
-        if cfg!(feature = "deprecated-layout") {
-            quote! {
-                use std::io::{Write, Cursor};
-                use anchor_lang::Discriminator;
-                let __dst: &mut [u8] = &mut __data;
-                let mut __cursor = Cursor::new(__dst);
-                Write::write_all(&mut __cursor, &#account_ty::discriminator()).unwrap();
-            }
-        } else {
-            quote! {
-                use std::io::{Write, Cursor};
-                use anchor_lang::Discriminator;
-                let __dst: &mut [u8] = &mut __data[2..];
-                let mut __cursor = Cursor::new(__dst);
-                Write::write_all(&mut __cursor, &#account_ty::discriminator()).unwrap();
-            }
+    let header_write = quote! {
+        {
+            use anchor_lang::Discriminator;
+            anchor_lang::accounts::header::write_discriminator(&mut __data, &#account_ty::discriminator());
         }
     };
     // Check the *entire* account header is zero.
@@ -541,30 +528,14 @@ fn generate_constraint_init(f: &Field, c: &ConstraintInitGroup) -> proc_macro2::
                     | Ty::Loader(_)
                     | Ty::AccountLoader(_) => {
                         let account_ty = f.account_ty();
-                        if cfg!(feature = "deprecated-layout") {
-                            quote! {
-                                {
-                                    use std::io::{Write, Cursor};
-                                    use anchor_lang::Discriminator;
+                        quote! {
+                            {
 
-                                    let mut __data = actual_field.try_borrow_mut_data()?;
-                                    let __dst: &mut [u8] = &mut __data;
-                                    let mut __cursor = Cursor::new(__dst);
-                                    Write::write_all(&mut __cursor, &#account_ty::discriminator()).unwrap();
-                                }
-                            }
-                        } else {
-                            quote! {
-                                {
-                                    use std::io::{Write, Seek, SeekFrom, Cursor};
-                                    use anchor_lang::Discriminator;
-
-                                    let mut __data = actual_field.try_borrow_mut_data()?;
-                                    let __dst: &mut [u8] = &mut __data;
-                                    let mut __cursor = Cursor::new(__dst);
-                                    Seek::seek(&mut __cursor, SeekFrom::Start(2)).unwrap();
-                                    Write::write_all(&mut __cursor, &#account_ty::discriminator()).unwrap();
-                                }
+                                let mut __data = actual_field.try_borrow_mut_data()?;
+                                anchor_lang::accounts::header::write_discriminator(
+                                    &mut __data,
+                                    &#account_ty::discriminator(),
+                                );
                             }
                         }
                     }
diff --git a/lang/syn/src/codegen/program/handlers.rs b/lang/syn/src/codegen/program/handlers.rs
index ba725e96..3858fabe 100644
--- a/lang/syn/src/codegen/program/handlers.rs
+++ b/lang/syn/src/codegen/program/handlers.rs
@@ -202,32 +202,13 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
                 let ix_name: proc_macro2::TokenStream =
                     generate_ctor_variant_name().parse().unwrap();
                 let ix_name_log = format!("Instruction: {}", ix_name);
-                let header_write = {
-                    if cfg!(feature = "deprecated-layout") {
-                        quote! {
-                            {
-                                use std::io::{Write, Cursor};
-                                use anchor_lang::Discriminator;
-
-                                let mut __data = ctor_accounts.to.try_borrow_mut_data()?;
-                                let __dst: &mut [u8] = &mut __data;
-                                let mut __cursor = Cursor::new(__dst);
-                                Write::write_all(&mut __cursor, &#name::discriminator()).unwrap();
-                            }
-                        }
-                    } else {
-                        quote! {
-                            {
-                                use std::io::{Write, Cursor, SeekFrom, Seek};
-                                use anchor_lang::Discriminator;
-
-                                let mut __data = ctor_accounts.to.try_borrow_mut_data()?;
-                                let __dst: &mut [u8] = &mut __data;
-                                let mut __cursor = Cursor::new(__dst);
-                                Seek::seek(&mut __cursor, SeekFrom::Start(2)).unwrap();
-                                Write::write_all(&mut __cursor, &#name::discriminator()).unwrap();
-                            }
-                        }
+                let header_write = quote! {
+                    {
+                        let mut __data = ctor_accounts.to.try_borrow_mut_data()?;
+                        anchor_lang::accounts::header::write_discriminator(
+                            &mut __data,
+                            &#name::discriminator(),
+                        );
                     }
                 };
                 if state.is_zero_copy {