1 files changed, 1 insertions, 97 deletions

diff --git a/src/common/crypto_dh.c b/src/common/crypto_dh.c
index 625a270254..09e6ca5063 100644
--- a/src/common/crypto_dh.c
+++ b/src/common/crypto_dh.c
@@ -12,6 +12,7 @@
 #include "compat_openssl.h"
 #include "crypto_dh.h"
 #include "crypto_digest.h"
+#include "crypto_hkdf.h"
 #include "crypto_util.h"
 
 DISABLE_GCC_WARNING(redundant-decls)
@@ -493,103 +494,6 @@ crypto_dh_free_(crypto_dh_t *dh)
   tor_free(dh);
 }
 
-/** Given <b>key_in_len</b> bytes of negotiated randomness in <b>key_in</b>
- * ("K"), expand it into <b>key_out_len</b> bytes of negotiated key material in
- * <b>key_out</b> by taking the first <b>key_out_len</b> bytes of
- *    H(K | [00]) | H(K | [01]) | ....
- *
- * This is the key expansion algorithm used in the "TAP" circuit extension
- * mechanism; it shouldn't be used for new protocols.
- *
- * Return 0 on success, -1 on failure.
- */
-int
-crypto_expand_key_material_TAP(const uint8_t *key_in, size_t key_in_len,
-                               uint8_t *key_out, size_t key_out_len)
-{
-  int i, r = -1;
-  uint8_t *cp, *tmp = tor_malloc(key_in_len+1);
-  uint8_t digest[DIGEST_LEN];
-
-  /* If we try to get more than this amount of key data, we'll repeat blocks.*/
-  tor_assert(key_out_len <= DIGEST_LEN*256);
-
-  memcpy(tmp, key_in, key_in_len);
-  for (cp = key_out, i=0; cp < key_out+key_out_len;
-       ++i, cp += DIGEST_LEN) {
-    tmp[key_in_len] = i;
-    if (crypto_digest((char*)digest, (const char *)tmp, key_in_len+1) < 0)
-      goto exit;
-    memcpy(cp, digest, MIN(DIGEST_LEN, key_out_len-(cp-key_out)));
-  }
-
-  r = 0;
- exit:
-  memwipe(tmp, 0, key_in_len+1);
-  tor_free(tmp);
-  memwipe(digest, 0, sizeof(digest));
-  return r;
-}
-
-/** Expand some secret key material according to RFC5869, using SHA256 as the
- * underlying hash.  The <b>key_in_len</b> bytes at <b>key_in</b> are the
- * secret key material; the <b>salt_in_len</b> bytes at <b>salt_in</b> and the
- * <b>info_in_len</b> bytes in <b>info_in_len</b> are the algorithm's "salt"
- * and "info" parameters respectively.  On success, write <b>key_out_len</b>
- * bytes to <b>key_out</b> and return 0.  Assert on failure.
- */
-int
-crypto_expand_key_material_rfc5869_sha256(
-                                    const uint8_t *key_in, size_t key_in_len,
-                                    const uint8_t *salt_in, size_t salt_in_len,
-                                    const uint8_t *info_in, size_t info_in_len,
-                                    uint8_t *key_out, size_t key_out_len)
-{
-  uint8_t prk[DIGEST256_LEN];
-  uint8_t tmp[DIGEST256_LEN + 128 + 1];
-  uint8_t mac[DIGEST256_LEN];
-  int i;
-  uint8_t *outp;
-  size_t tmp_len;
-
-  crypto_hmac_sha256((char*)prk,
-                     (const char*)salt_in, salt_in_len,
-                     (const char*)key_in, key_in_len);
-
-  /* If we try to get more than this amount of key data, we'll repeat blocks.*/
-  tor_assert(key_out_len <= DIGEST256_LEN * 256);
-  tor_assert(info_in_len <= 128);
-  memset(tmp, 0, sizeof(tmp));
-  outp = key_out;
-  i = 1;
-
-  while (key_out_len) {
-    size_t n;
-    if (i > 1) {
-      memcpy(tmp, mac, DIGEST256_LEN);
-      memcpy(tmp+DIGEST256_LEN, info_in, info_in_len);
-      tmp[DIGEST256_LEN+info_in_len] = i;
-      tmp_len = DIGEST256_LEN + info_in_len + 1;
-    } else {
-      memcpy(tmp, info_in, info_in_len);
-      tmp[info_in_len] = i;
-      tmp_len = info_in_len + 1;
-    }
-    crypto_hmac_sha256((char*)mac,
-                       (const char*)prk, DIGEST256_LEN,
-                       (const char*)tmp, tmp_len);
-    n = key_out_len < DIGEST256_LEN ? key_out_len : DIGEST256_LEN;
-    memcpy(outp, mac, n);
-    key_out_len -= n;
-    outp += n;
-    ++i;
-  }
-
-  memwipe(tmp, 0, sizeof(tmp));
-  memwipe(mac, 0, sizeof(mac));
-  return 0;
-}
-
 void
 crypto_dh_free_all(void)
 {