consistent use of 'const'

[pam_pcsc_cr.git] / crypto.c

diff --git a/crypto.c b/crypto.c
index 83ba4efd1d35d0ae618f6cd0f1353b0568075b83..cb996e870f71cf011bd41b4b159528bb5f35f825 100644 (file)
--- a/crypto.c
+++ b/crypto.c
@@ -1,28 +1,97 @@
+/*
+Copyright (c) 2013 Eugene Crosser
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must
+    not claim that you wrote the original software. If you use this
+    software in a product, an acknowledgment in the product documentation
+    would be appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must
+    not be misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include <assert.h>
 #include "crypto.h"
 #include "crypto_if.h"
 
 extern struct crypto_interface ossl_crypto_if;
 extern struct crypto_interface tom_crypto_if;
+extern struct crypto_interface gnu_crypto_if;
+
+static struct crypto_interface *ifs[] = {
+#ifdef HAVE_OPENSSL
+       &ossl_crypto_if,
+#endif
+#ifdef HAVE_TOMCRYPT
+       &tom_crypto_if,
+#endif
+#ifdef HAVE_GCRYPT
+       &gnu_crypto_if,
+#endif
+       (struct crypto_interface *)0,
+};
+#define MAX_IF (sizeof(ifs)/sizeof(struct crypto_interface *)-2)
+
+static int which = 0;
+
+int select_crypto_if(const int ifno)
+{
+       if (ifno < 0 || ifno > MAX_IF) return -1;
+       which = ifno;
+       return 0;
+}
+
+const char *crypto_init(const int ifno)
+{
+       if (ifno < 0 || ifno > MAX_IF) return (const char *)0;
+       return ifs[ifno]->init();
+}
 
-static struct crypto_interface *active = &ossl_crypto_if;
+#define INITIV {0}
 
-int encrypt(void *pt, int ptlen, void *key, int keylen, void *ct, int *ctlen)
+unsigned long encrypt(const void *key, const int keylen, const void *pt, void *ct, const int tlen)
 {
-       return active->encrypt(pt, ptlen, key, keylen, ct, ctlen);
+       unsigned char iv[16] = INITIV;
+
+       assert(keylen == 16);
+       return ifs[which]->encrypt(key, keylen, iv, pt, ct, tlen);
 }
 
-int decrypt(void *ct, int ctlen, void *key, int keylen, void *pt, int *ptlen)
+unsigned long decrypt(const void *key, const int keylen, const void *ct, void *pt, const int tlen)
 {
-       return active->decrypt(ct, ctlen, key, keylen, pt, ptlen);
+       unsigned char iv[16] = INITIV;
+
+       assert(keylen == 16);
+       return ifs[which]->decrypt(key, keylen, iv, ct, pt, tlen);
 }
 
-int hash(void *pt, int ptlen, void *tag, int *taglen)
+unsigned long hash(const void *pt, const int tlen, void *tag, int *taglen)
 {
-       return active->hash(pt, ptlen, tag, taglen);
+       assert(*taglen == 20);
+       return ifs[which]->hash(pt, tlen, tag, taglen);
 }
 
-int hmac(void *pt, int ptlen, void *key, int keylen, void *tag, int *taglen)
+unsigned long hmac(const void *key, const int keylen, const void *pt, const int tlen, void *tag, int *taglen)
 {
-       return active->hmac(pt, ptlen, key, keylen, tag, taglen);
+       assert(*taglen == 20);
+       return ifs[which]->hmac(key, keylen, pt, tlen, tag, taglen);
 }
 
+const char *crypto_errstr(const unsigned long err)
+{
+       return ifs[which]->errstr(err);
+}