first pass

[PuTTY.git] / sshsh256.c

diff --git a/sshsh256.c b/sshsh256.c
index 8e3d4fc15429ae1058f4132645658868d82610d7..4186f3e8180fc54b54fdefa19851200fd17157fe 100644 (file)
--- a/sshsh256.c
+++ b/sshsh256.c
@@ -200,6 +200,24 @@ static void *sha256_init(void)
     return s;
 }
 
+static void *sha256_copy(const void *vold)
+{
+    const SHA256_State *old = (const SHA256_State *)vold;
+    SHA256_State *s;
+
+    s = snew(SHA256_State);
+    *s = *old;
+    return s;
+}
+
+static void sha256_free(void *handle)
+{
+    SHA256_State *s = handle;
+
+    smemclr(s, sizeof(*s));
+    sfree(s);
+}
+
 static void sha256_bytes(void *handle, const void *p, int len)
 {
     SHA256_State *s = handle;
@@ -212,12 +230,12 @@ static void sha256_final(void *handle, unsigned char *output)
     SHA256_State *s = handle;
 
     SHA256_Final(s, output);
-    smemclr(s, sizeof(*s));
-    sfree(s);
+    sha256_free(s);
 }
 
 const struct ssh_hash ssh_sha256 = {
-    sha256_init, sha256_bytes, sha256_final, 32, "SHA-256"
+    sha256_init, sha256_copy, sha256_bytes, sha256_final, sha256_free,
+    32, "SHA-256"
 };
 
 /* ----------------------------------------------------------------------
@@ -327,7 +345,7 @@ const struct ssh_mac ssh_hmac_sha256 = {
     hmacsha256_start, hmacsha256_bytes,
     hmacsha256_genresult, hmacsha256_verresult,
     "hmac-sha2-256", "hmac-sha2-256-etm@openssh.com",
-    32,
+    32, 32,
     "HMAC-SHA-256"
 };