bcrypt and null kdf done, work on ciphers next (then keytypes)

cipher/aes/aes256/cbc/TODO

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+TODO

cipher/aes/aes256/cbc/consts.go

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+package cbc
+
+const (
+	Name string = "aes256-cbc"
+)

cipher/aes/aes256/consts.go

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+package aes256
+
+import (
+	`r00t2.io/sshkeys/cipher/aes`
+)
+
+const (
+	KeySize    int = 32 // in bytes; AES256 is so named for its 256-bit key, thus: 256 / 8 = 32
+	KdfKeySize int = KeySize + aes.IvSize
+)

cipher/aes/aes256/ctr/TODO

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+TODO

cipher/aes/aes256/ctr/consts.go

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+package ctr
+
+const (
+	Name string = "aes256-ctr"
+)

cipher/aes/aes256/gcm/TODO

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+TODO

cipher/aes/aes256/gcm/consts.go

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+package gcm
+
+const (
+	Name string = "aes256-gcm@openssh.com"
+)