stubbed out cipher funcs

TODO

@@ -4,3 +4,8 @@
 --- ssh-rsa (sha1), rsa-sha2-256, rsa-sha2-512 (new default)
 - ciphers:
 -- 3des-cbc, aes128-cbc, aes192-cbc, aes256-cbc, aes128-ctr, aes192-ctr, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com, chacha20-poly1305@openssh.com
+
+provide marshal, unmarshal for keytypes/* keys.
+https://golangexample.com/encode-and-decode-binary-message-and-file-formats-in-go/ (?)
+
+create separate package, go_sshdh

_ref/KEY_GUIDE.html

@@ -734,7 +734,7 @@ pre.rouge {
 <h1>OpenSSH Key Structure Guide</h1>
 <div class="details">
 <span id="author" class="author">brent saner &lt;bts@square-r00t.net&gt;, https://r00t2.io</span><br>
-<span id="revdate">Last updated 2022-04-25 04:27:24 -0400</span>
+<span id="revdate">Last updated 2022-04-28 05:18:26 -0400</span>
 </div>
 <div id="toc" class="toc2">
 <div id="toctitle">Table of Contents</div>

cipher/aes/aes128/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes128/cbc/types.go

@@ -0,0 +1,18 @@
+package cbc
+
+import (
+	`crypto/cipher`
+)
+
+// Cipher is an AES128-CBC cipher.Cipher.
+type Cipher struct {
+	// key contains the encryption key.
+	key []byte
+	// iv contains the IV, or initialization vector.
+	iv []byte
+	/*
+		cryptBlock contains the block encryptor.
+		CBC is a block (all at once) encryption mode.
+	*/
+	cryptBlock cipher.Block
+}

cipher/aes/aes128/consts.go

@@ -1,10 +1,10 @@
 package aes128
 
 import (
-	`r00t2.io/sshkeys/cipher/aes`
+	sshAES `r00t2.io/sshkeys/cipher/aes`
 )
 
 const (
 	KeySize    int = 16 // in bytes; AES128 is so named for its 128-bit key, thus: 128 / 8 = 16
-	KdfKeySize int = KeySize + aes.IvSize
+	KdfKeySize int = KeySize + sshAES.IvSize
 )

cipher/aes/aes128/ctr/funcs.go

@@ -0,0 +1,205 @@
+package ctr
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes128/gcm/funcs.go

@@ -0,0 +1,205 @@
+package gcm
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes192/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes192/ctr/funcs.go

@@ -0,0 +1,205 @@
+package ctr
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes192/gcm/funcs.go

@@ -0,0 +1,205 @@
+package gcm
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes256/cbc/funcs.go

@@ -0,0 +1,205 @@
+package cbc
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes256/ctr/funcs.go

@@ -0,0 +1,205 @@
+package ctr
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err != nil {
+		return
+	}
+
+	encrypted = bytes.NewReader(buf.Bytes())
+
+	return
+}
+
+/*
+	Pad will pad data (a string, []byte, byte, or *bytes.Buffer) to the Cipher.BlockSize (if necessary).
+	The resulting padded buffer is returned.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Pad.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Pad(data interface{}) (paddedBuf *bytes.Reader, err error) {
+
+	// TODO
+
+	return
+}
+
+/*
+	Decrypt takes a raw byte slice, a *bytes.Buffer, or a *bytes.Reader and returns a plain/decrypted *bytes.Reader.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Decrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Decrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var decryptDst []byte
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	decryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = decryptDst
+
+	return
+}
+
+/*
+	AllocatedDecrypt is the same as Cipher.Decrypt but assumes that data includes an unencrypted uint32 byte allocator prefix.
+
+	Be *extremely* certain of this, as things can get REALLY weird if you pass in data that doesn't actually have that prefix.
+
+	NOTE: The decrypted data contains padding. It is up to the caller to remove/strip.
+
+	NOTE: If data is a bytes.Buffer pointer, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+
+	NOTE: If data is a *bytes.Reader, it will consume ONLY the leading prefix and the length of bytes the prefix indicates and no more.
+*/
+func (c *Cipher) AllocatedDecrypt(data interface{}) (decrypted *bytes.Reader, err error) {
+
+	var b []byte
+
+	if b, err = internal.UnpackBytes(data); err != nil {
+		return
+	}
+	if decrypted, err = c.Decrypt(b); err != nil {
+		return
+	}
+
+	return
+}
+
+/*
+	IsPlain indicates if this Cipher is a plain/null encryption (cipher.null.Null).
+
+	It will always return false. It is included for interface compatability.
+*/
+func (c *Cipher) IsPlain() (plain bool) {
+
+	plain = false
+
+	return
+}

cipher/aes/aes256/gcm/funcs.go

@@ -0,0 +1,205 @@
+package gcm
+
+import (
+	`bytes`
+	`io`
+
+	`r00t2.io/sshkeys/cipher/aes`
+	`r00t2.io/sshkeys/cipher/aes/aes128`
+	`r00t2.io/sshkeys/internal`
+)
+
+func (c *Cipher) Setup(key []byte) (err error) {
+
+	// TODO
+
+	return
+}
+
+// Name returns the name as used in the key file bytes.
+func (c *Cipher) Name() (name string) {
+
+	name = Name
+
+	return
+}
+
+// NameBytes returns the byte form of Cipher.Name with leading bytecount allocator.
+func (c *Cipher) NameBytes() (name []byte) {
+
+	var err error
+
+	if name, err = internal.PackBytes(Name); err != nil {
+		return
+	}
+
+	return
+}
+
+// BlockSize returns the blocksize of this Cipher.
+func (c *Cipher) BlockSize() (size int) {
+
+	size = aes.BlockSize
+
+	return
+}
+
+// KdfKeySize returns the target key length from KDF to use with this Cipher.
+func (c *Cipher) KdfKeySize() (size int) {
+
+	size = aes128.KeySize
+
+	return
+}
+
+/*
+	Encrypt encrypts data (a string, []byte, byte, *bytes.Buffer, or *bytes.Reader) to the *bytes.Reader encrypted.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.Encrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) Encrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b []byte
+	var cryptDst []byte
+	var padded *bytes.Reader
+
+	if b, err = internal.SerializeData(data); err != nil {
+		return
+	}
+
+	if padded, err = c.Pad(b); err != nil {
+		return
+	}
+
+	b = make([]byte, padded.Len())
+	if b, err = io.ReadAll(padded); err != nil {
+		return
+	}
+
+	cryptDst = make([]byte, len(b))
+
+	// TODO
+	_ = cryptDst
+
+	return
+}
+
+/*
+	AllocateEncrypt is the same as Cipher.Encrypt but includes an unencrypted byte allocator prefix.
+
+	NOTE: Padding IS applied automatically.
+
+	NOTE: If data is a *bytes.Buffer, no bytes will be consumed -- the bytes are taken in entirety without consuming them (Buffer.Bytes()).
+		  It is up to the caller to consume the buffer as desired beforehand or isolate to a specific sub-buffer beforehand to pass to Cipher.AllocateEncrypt.
+
+	NOTE: If data is a *bytes.Reader, ALL bytes WILL be consumed.
+*/
+func (c *Cipher) AllocateEncrypt(data interface{}) (encrypted *bytes.Reader, err error) {
+
+	var b *bytes.Reader
+	var buf *bytes.Buffer = new(bytes.Buffer)
+	var alloc []byte = make([]byte, 4)
+
+	if b, err = c.Encrypt(data); err != nil {
+		return
+	}
+	if alloc, err = internal.PackBytes(b); err != nil {
+		return
+	}
+
+	if _, err = buf.Write(alloc); err != nil {
+		return
+	}
+	if _, err = b.WriteTo(buf); err