vlib.crypto+other: fix mut args

vlib/crypto/aes/aes_cbc.v

@@ -47,7 +47,8 @@ pub fn new_cbc(b AesCipher, iv []byte) AesCbc {
 
 pub fn (x &AesCbc) block_size() int { return x.block_size }
 
-pub fn (x &AesCbc) encrypt_blocks(dst, src []byte) {
+pub fn (x mut AesCbc) encrypt_blocks(dst mut []byte, src_ []byte) {
+	mut src := src_
 	if src.len%x.block_size != 0 {
 		panic('crypto.cipher: input not full blocks')
 	}
@@ -72,14 +73,14 @@ pub fn (x &AesCbc) encrypt_blocks(dst, src []byte) {
 		} else {
 			src = src.right(x.block_size)
 		}
-		dst = dst.right(x.block_size)
+		*dst = dst.right(x.block_size)
 	}
 
 	// Save the iv for the next crypt_blocks call.
 	copy(x.iv, iv)
 }
 
-pub fn (x &AesCbc) decrypt_blocks(dst mut []byte, src []byte) {
+pub fn (x mut AesCbc) decrypt_blocks(dst mut []byte, src []byte) {
 	if src.len%x.block_size != 0 {
 		panic('crypto.cipher: input not full blocks')
 	}
@@ -105,7 +106,7 @@ pub fn (x &AesCbc) decrypt_blocks(dst mut []byte, src []byte) {
 	// Loop over all but the first block.
 	for start > 0 {
 		x.b.decrypt(dst.slice(start, end), src.slice(start, end))
-		cipher.xor_bytes(dst.slice(start, end), dst.slice(start, end), src.slice(prev, start))
+		cipher.xor_bytes(mut dst.slice(start, end), dst.slice(start, end), src.slice(prev, start))
 
 		end = start
 		start = prev
@@ -122,7 +123,7 @@ pub fn (x &AesCbc) decrypt_blocks(dst mut []byte, src []byte) {
 	x.tmp = x.iv
 }
 
-fn (x &AesCbc) set_iv(iv []byte) {
+fn (x mut AesCbc) set_iv(iv []byte) {
 	if iv.len != x.iv.len {
 		panic('cipher: incorrect length IV')
 	}

vlib/crypto/aes/aes_test.v

@@ -21,7 +21,7 @@ fn test_crypto_aes() {
 		panic('ciphertext is not a multiple of the block size')
 	}
 	mode := aes.new_cbc(block, iv)
-	mode.encrypt_blocks(ciphertext, ciphertext)
+	mode.encrypt_blocks(mut ciphertext, ciphertext)
 
 	assert ciphertext.hex() == 'c210459b514668ddc44674885e4979215265a6c44431a248421254ef357a8c2a308a8bddf5623af9df91737562041cf1'
 }

vlib/crypto/aes/block_generic.v

@@ -160,7 +160,7 @@ fn rotw(w u32) u32 { return u32(w<<u32(8)) | u32(w>>u32(24)) }
 
 // Key expansion algorithm. See FIPS-197, Figure 11.
 // Their rcon[i] is our powx[i-1] << 24.
-fn expand_key_generic(key []byte, enc, dec []u32) {
+fn expand_key_generic(key []byte, enc mut []u32, dec mut []u32) {
 	// Encryption key setup.
 	mut i := 0
 	nk := key.len / 4

vlib/crypto/aes/cypher_generic.v

@@ -13,10 +13,10 @@ import (
 // this is the generiv v version, no arch optimisations
 fn new_cipher_generic(key []byte) AesCipher {
 	n := key.len + 28
-	c := AesCipher{
+	mut c := AesCipher{
 		enc: [u32(0); n]
 		dec: [u32(0); n]
 	}
-	expand_key_generic(key, c.enc, c.dec)
+	expand_key_generic(key, mut c.enc, mut c.dec)
 	return c
 }