diff --git a/0.go b/0.go
index 21f7756..49a6fcf 100644
--- a/0.go
+++ b/0.go
@@ -42,6 +42,16 @@ func getCPascalStringArrayFromStringSlice(goSlice []string) C.PascalStringArray
 	return C.PascalStringArray{data: cArrPtr, len: C.int(len(goSlice))}
 }
 
+// getStringSliceFromCPascalStringArray converts a C.PascalStringArray to a go slice.
+func getStringSliceFromCPascalStringArray(pascalStringArray C.PascalStringArray) []string {
+	var goSlice []string
+	cArr := (*[1 << 30]C.PascalString)(unsafe.Pointer(pascalStringArray.data))[:pascalStringArray.len:pascalStringArray.len]
+	for i := 0; i < int(pascalStringArray.len); i++ {
+		goSlice = append(goSlice, C.GoStringN(cArr[i].data, cArr[i].len))
+	}
+	return goSlice
+}
+
 // GetPascalStringFromCString is a helper meant to be used from C.
 //
 //export GetPascalStringFromCString
diff --git a/README.md b/README.md
index 0d1b322..d832199 100644
--- a/README.md
+++ b/README.md
@@ -78,16 +78,16 @@ int main() {
 - [X] config
     - [X] Write(cfg *CfgT, appendMode bool) error
     - [X] Load() (*CfgT, error)
-- [ ] core
-    - [ ] EntryAddPrecheck(realPath string) (uint8, error)
-    - [ ] EntryIsNotEmpty(entryData []string) bool
-    - [ ] EntryRefresh(oldRCWPassword, newRCWPassword []byte, removeOldDir bool) error
-    - [ ] GenTOTP(secret string, time time.Time) (string, error)
-    - [ ] GetOldEntryData(realPath string, field int, rcwPassword []byte) ([]string, error)
-    - [ ] LibmuttonInit(inputCB func(prompt string) string, rcwPassword []byte, ...) error
-    - [ ] RCWSanityCheckGen(password []byte) error
-    - [ ] VerifyEntries(rcwPassword []byte) error
-    - [ ] WriteEntry(realPath string, decSlice []string, passwordIsNew bool, rcwPassword []byte) error
+- [X] core
+    - [X] EntryAddPrecheck(realPath string) (uint8, error)
+    - [X] EntryIsNotEmpty(entryData []string) bool
+    - [X] EntryRefresh(oldRCWPassword, newRCWPassword []byte, removeOldDir bool) error
+    - [X] GenTOTP(secret string, time time.Time) (string, error)
+    - [X] GetOldEntryData(realPath string, field int, rcwPassword []byte) ([]string, error)
+    - [X] LibmuttonInit(inputCB func(prompt string) string, rcwPassword []byte, ...) error
+    - [X] RCWSanityCheckGen(password []byte) error
+    - [X] VerifyEntries(rcwPassword []byte) error
+    - [X] WriteEntry(realPath string, decSlice []string, passwordIsNew bool, rcwPassword []byte) error
 - [X] crypt
     - [X] ~~VAR: RetryPassword bool~~ (RCWD not supported)
     - [X] DecryptFileToSlice(realPath string) ([]string, error)
@@ -102,7 +102,7 @@ int main() {
     - [X] GetRealPath(vanityPath string) string
     - [X] ~~GetSysProcAttr() *syscall.SysProcAttr~~ (not for use outside of libmutton)
     - [X] GetVanityPath(realPath string) string
-- [ ] syncclient
+- [X] syncclient
     - [X] AddFolderRemote(vanityPath string) error
     - [X] GenDeviceID(oldDeviceID, prefix string) (string, string, bool, error)
     - [X] ~~GetSSHClient() (*ssh.Client, bool, *bool, *string, *string, error)~~ (not for use outside of libmutton)
diff --git a/clip.go b/clip.go
index 045a406..ed66ede 100644
--- a/clip.go
+++ b/clip.go
@@ -9,7 +9,7 @@ import (
 
 // ClearProcess clears the clipboard in 30 seconds if its contents still match assignedContents.
 // If assignedContents is an empty string, the clipboard will clear immediately and unconditionally.
-//
+// Returns:
 // r0: err
 //
 //export ClearProcess
diff --git a/config.go b/config.go
index b7dd6b1..1e6fda2 100644
--- a/config.go
+++ b/config.go
@@ -8,6 +8,7 @@ import (
 )
 
 // LoadOfficialCfg returns the currently set (libmutton official) values in the libmutton config file.
+// Returns:
 // r0: err
 //
 // r1: OfflineMode (bool)
@@ -38,6 +39,7 @@ func LoadOfficialCfg() (*C.char, bool, C.PascalString, C.PascalString, C.PascalS
 }
 
 // WriteOfficialCfg writes the provided (libmutton official) values to the libmutton config file.
+// Returns:
 // r0: err
 //
 //export WriteOfficialCfg
diff --git a/core.go b/core.go
new file mode 100644
index 0000000..e0fe3bb
--- /dev/null
+++ b/core.go
@@ -0,0 +1,142 @@
+package main
+
+// #include <stdlib.h>
+// #include "types.h"
+import "C"
+import (
+	"strings"
+	"time"
+
+	"github.com/rwinkhart/libmutton/core"
+)
+
+// EntryAddPrecheck returns:
+// r0: err
+//
+// r1: status
+//
+//export EntryAddPrecheck
+func EntryAddPrecheck(realPath C.PascalString) (*C.char, uint8) {
+	status, err := core.EntryAddPrecheck(C.GoStringN(realPath.data, realPath.len))
+	if err != nil {
+		return C.CString(err.Error()), status
+	}
+	return nil, status
+}
+
+// EntryIsNotEmpty returns:
+// r0: notEmpty
+//
+//export EntryIsNotEmpty
+func EntryIsNotEmpty(entryData C.PascalStringArray) bool {
+	notEmpty := core.EntryIsNotEmpty(getStringSliceFromCPascalStringArray(entryData))
+	return notEmpty
+}
+
+// EntryRefresh returns:
+// r0: err
+//
+//export EntryRefresh
+func EntryRefresh(oldRCWPassword, newRCWPassword C.PascalString, removeOldDir bool) *C.char {
+	err := core.EntryRefresh([]byte(C.GoStringN(oldRCWPassword.data, oldRCWPassword.len)), []byte(C.GoStringN(newRCWPassword.data, newRCWPassword.len)), removeOldDir)
+	if err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+// GenTOTP returns:
+// r0: err
+//
+// r1: token
+//
+//export GenTOTP
+func GenTOTP(secret C.PascalString, unixTimestamp int64) (*C.char, C.PascalString) {
+	token, err := core.GenTOTP(C.GoStringN(secret.data, secret.len), time.Unix(unixTimestamp, 0))
+	if err != nil {
+		return C.CString(err.Error()), C.PascalString{data: nil, len: -1}
+	}
+	return nil, getPascalString(token)
+}
+
+// GetOldEntryData returns:
+// r0: err
+//
+// r1: lines
+//
+//export GetOldEntryData
+func GetOldEntryData(realPath C.PascalString, field int, rcwPassword C.PascalString) (*C.char, C.PascalStringArray) {
+	lines, err := core.GetOldEntryData(C.GoStringN(realPath.data, realPath.len), field, []byte(C.GoStringN(rcwPassword.data, rcwPassword.len)))
+	if err != nil {
+		return C.CString(err.Error()), C.PascalStringArray{}
+	}
+	return nil, getCPascalStringArrayFromStringSlice(lines)
+}
+
+// LibmuttonInit is a partial implementation that does not allow for client-specific config.
+// Returns:
+// r0: err
+//
+// Special requirement:
+// An array of ordered responses to inputCB questions.
+//
+//export LibmuttonInit
+func LibmuttonInit(inputCBResponses C.PascalStringArray, rcwPassword C.PascalString, appendMode bool, forceOfflineMode bool, deviceIDPrefix C.PascalString) *C.char {
+	inputCBRespSlice := getStringSliceFromCPascalStringArray(inputCBResponses)
+	supplyInputForInit := func(prompt string) string {
+		if strings.HasPrefix(prompt, "Configure SSH settings (for synchronization)? (Y/n)") {
+			return inputCBRespSlice[0]
+		} else if strings.HasPrefix(prompt, "SSH private identity file path (falls back to") {
+			return inputCBRespSlice[1]
+		} else if strings.HasPrefix(prompt, "Is the identity file password-protected? (y/N)") {
+			return inputCBRespSlice[2]
+		} else if strings.HasPrefix(prompt, "Remote SSH username:") {
+			return inputCBRespSlice[3]
+		} else if strings.HasPrefix(prompt, "Remote SSH IP/domain:") {
+			return inputCBRespSlice[4]
+		} else if strings.HasPrefix(prompt, "Remote SSH port:") {
+			return inputCBRespSlice[5]
+		}
+		return ""
+	}
+
+	if err := core.LibmuttonInit(supplyInputForInit, []byte(C.GoStringN(rcwPassword.data, rcwPassword.len)), appendMode, forceOfflineMode, C.GoStringN(deviceIDPrefix.data, deviceIDPrefix.len), nil); err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+// RCWSanityCheckGen returns:
+// r0: err
+//
+//export RCWSanityCheckGen
+func RCWSanityCheckGen(password C.PascalString) *C.char {
+	err := core.RCWSanityCheckGen([]byte(C.GoStringN(password.data, password.len)))
+	if err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+// VerifyEntries returns:
+// r0: err
+//
+//export VerifyEntries
+func VerifyEntries(rcwPassword C.PascalString) *C.char {
+	err := core.VerifyEntries([]byte(C.GoStringN(rcwPassword.data, rcwPassword.len)))
+	if err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+// WriteEntry returns:
+// r0: err
+//
+//export WriteEntry
+func WriteEntry(realPath C.PascalString, decSlice C.PascalStringArray, passwordIsNew bool, rcwPassword C.PascalString) *C.char {
+	if err := core.WriteEntry(C.GoStringN(realPath.data, realPath.len), getStringSliceFromCPascalStringArray(decSlice), passwordIsNew, []byte(C.GoStringN(rcwPassword.data, rcwPassword.len))); err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
diff --git a/go.mod b/go.mod
index a2f4054..69aa860 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,8 @@ module cmutton
 go 1.26rc2
 
 require (
-	github.com/rwinkhart/libmutton v0.4.3-0.20260124190333-b963ccf33e54
-	github.com/rwinkhart/rcw v0.2.4
+	github.com/rwinkhart/libmutton v0.4.3-0.20260125215941-ec9c6b506232
+	github.com/rwinkhart/rcw v0.2.5
 )
 
 require (
diff --git a/go.sum b/go.sum
index 910fbb0..4f0974d 100644
--- a/go.sum
+++ b/go.sum
@@ -16,12 +16,12 @@ github.com/pquerna/otp v1.5.0 h1:NMMR+WrmaqXU4EzdGJEE1aUUI0AMRzsp96fFFWNPwxs=
 github.com/pquerna/otp v1.5.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
 github.com/rwinkhart/go-boilerplate v0.2.2 h1:SVHTAQU+HWFivtUnDBcfrgClJV5ZmHyFS7/uERh7NKU=
 github.com/rwinkhart/go-boilerplate v0.2.2/go.mod h1:/NVRKGslU20E5xU5YOgXzWxA6aa94BMtv5MtHRTb5Ek=
-github.com/rwinkhart/libmutton v0.4.3-0.20260124190333-b963ccf33e54 h1:04PtrDqnj6NrrhY5Uu21wc/N3n9lio+WCD6+55xbaIo=
-github.com/rwinkhart/libmutton v0.4.3-0.20260124190333-b963ccf33e54/go.mod h1:4/Ry5uDUaWTdNqVR/URhqM6NveB3dFfxCmO+LyisBcQ=
+github.com/rwinkhart/libmutton v0.4.3-0.20260125215941-ec9c6b506232 h1:NzUoqkjBy9u9a3wV+D1DR2DemVpYi0Hxug800ybarZE=
+github.com/rwinkhart/libmutton v0.4.3-0.20260125215941-ec9c6b506232/go.mod h1:63SCVQaWcg4JiEBxYEtLwAiRxXQvlpyFsmWUxxfdIpU=
 github.com/rwinkhart/peercred-mini v0.1.2 h1:4cGWDbv0whvLeVvbUdx84V/9p+2fS+DEXgrA1KxlRFo=
 github.com/rwinkhart/peercred-mini v0.1.2/go.mod h1:LLHG7YshHEpbpJJP+Il9nx2dnGj5O3VGE32rWmflj0c=
-github.com/rwinkhart/rcw v0.2.4 h1:FrRSsl+ui1WLmDwqjLSROtFPKqSeGLEfF2SPENt4qP0=
-github.com/rwinkhart/rcw v0.2.4/go.mod h1:nhW4RAHvEjW2QcOlqEdWqRQOFJLjoOGSPkSRZlMjU3s=
+github.com/rwinkhart/rcw v0.2.5 h1:3GJeii9sDZsZNL+HRkfHrnbgxnaB8a9kejiMIfPXnpE=
+github.com/rwinkhart/rcw v0.2.5/go.mod h1:qVw8Yp/SKtsuVZYOzzluVEVkoRJ1G7UEh2aR1CXso/U=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=