Fix compilation with --disable-curve25519 option

The fix is to move the two functions to format/parse base64
curve25519 public keys into a new "crypto_format.c" file.  I could
have put them in crypto.c, but that's a big file worth splitting
anyway.

Fixes bug 8153; bugfix on 0.2.4.8-alpha where I did the fix for 7869.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/common/crypto_format.c b/src/common/crypto_format.c
new file mode 100644
index 0000000000..93932f839c
--- /dev/null
+++ b/src/common/crypto_format.c
@@ -0,0 +1,46 @@
+/* Copyright (c) 2012-2013, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/* Formatting and parsing code for crypto-related data structures. */
+
+#define CRYPTO_CURVE25519_PRIVATE
+#include "orconfig.h"
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#include "crypto.h"
+#include "crypto_curve25519.h"
+#include "util.h"
+#include "torlog.h"
+
+int
+curve25519_public_to_base64(char *output,
+                            const curve25519_public_key_t *pkey)
+{
+  char buf[128];
+  base64_encode(buf, sizeof(buf),
+                (const char*)pkey->public_key, CURVE25519_PUBKEY_LEN);
+  buf[CURVE25519_BASE64_PADDED_LEN] = '\0';
+  memcpy(output, buf, CURVE25519_BASE64_PADDED_LEN+1);
+  return 0;
+}
+
+int
+curve25519_public_from_base64(curve25519_public_key_t *pkey,
+                              const char *input)
+{
+  size_t len = strlen(input);
+  if (len == CURVE25519_BASE64_PADDED_LEN - 1) {
+    /* not padded */
+    return digest256_from_base64((char*)pkey->public_key, input);
+  } else if (len == CURVE25519_BASE64_PADDED_LEN) {
+    char buf[128];
+    if (base64_decode(buf, sizeof(buf), input, len) != CURVE25519_PUBKEY_LEN)
+      return -1;
+    memcpy(pkey->public_key, buf, CURVE25519_PUBKEY_LEN);
+    return 0;
+  } else {
+    return -1;
+  }
+}
+