crypto: add .free() and .reset() methods to reduce memory leaks with -autofree (#16992)

* Fix unsafe pointer

I was compile vab with '-prod' and it was needed  to fix and it is of course warning

* Add files via upload

* reduce memory  leak s sha512

* add method .free() and .reset() for some

vlib/crypto/cipher/cbc.v

@@ -19,6 +19,19 @@ mut:
 	tmp        []u8
 }
 
+// free the resources taken by the Cbc `x`
+[unsafe]
+pub fn (mut x Cbc) free() {
+	$if prealloc {
+		return
+	}
+	unsafe {
+		// x.b.free() TODO add?
+		x.iv.free()
+		x.tmp.free()
+	}
+}
+
 // internal
 fn new_des_cbc(b Block, iv []u8) Cbc {
 	return Cbc{

vlib/crypto/cipher/cfb.v

@@ -20,6 +20,19 @@ mut:
 	decrypt bool
 }
 
+// free the resources taken by the Cfb `x`
+[unsafe]
+pub fn (mut x Cfb) free() {
+	$if prealloc {
+		return
+	}
+	unsafe {
+		// x.b.free() TODO add?
+		x.out.free()
+		x.next.free()
+	}
+}
+
 // new_cfb_encrypter returns a `Cfb` which encrypts with cipher feedback mode,
 // using the given Block. The iv must be the same length as the Block's block
 // size

vlib/crypto/cipher/ctr.v

@@ -21,6 +21,19 @@ mut:
 	out_used int
 }
 
+// free the resources taken by the Ctr `c`
+[unsafe]
+pub fn (mut x Ctr) free() {
+	$if prealloc {
+		return
+	}
+	unsafe {
+		// x.b.free() TODO add?
+		x.out.free()
+		x.next.free()
+	}
+}
+
 // new_ctr returns a Ctr which encrypts/decrypts using the given Block in
 // counter mode. The length of iv must be the same as the Block's block size.
 pub fn new_ctr(b Block, iv []u8) Ctr {