tls: fold AES CBC en/decryption into single functions

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/tls_aes.h b/networking/tls_aes.h
index ea8ed7e..c679186 100644
--- a/networking/tls_aes.h
+++ b/networking/tls_aes.h
@@ -6,15 +6,5 @@
  * Selected few declarations for AES.
  */
 
-int32 psAesInitKey(const unsigned char *key, uint32 keylen, psAesKey_t *skey);
-void psAesEncryptBlock(const unsigned char *pt, unsigned char *ct,
-				psAesKey_t *skey);
-void psAesDecryptBlock(const unsigned char *ct, unsigned char *pt,
-				psAesKey_t *skey);
-
-int32 psAesInit(psCipherContext_t *ctx, unsigned char *IV,
-				  unsigned char *key, uint32 keylen);
-int32 psAesEncrypt(psCipherContext_t *ctx, unsigned char *pt,
-					 unsigned char *ct, uint32 len);
-int32 psAesDecrypt(psCipherContext_t *ctx, unsigned char *ct,
-					 unsigned char *pt, uint32 len);
+void aes_cbc_encrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst);
+void aes_cbc_decrypt(const void *key, int klen, void *iv, const void *data, size_t len, void *dst);