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-rw-r--r--key.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/key.c b/key.c
index cda91571..fb6bff95 100644
--- a/key.c
+++ b/key.c
@@ -801,3 +801,46 @@ key_verify(
break;
}
}
+
+/* Converts a private to a public key */
+
+Key *
+key_demote(Key *k)
+{
+ Key *pk;
+
+ pk = xmalloc(sizeof(*pk));
+ pk->type = k->type;
+ pk->flags = k->flags;
+ pk->dsa = NULL;
+ pk->rsa = NULL;
+
+ switch (k->type) {
+ case KEY_RSA1:
+ case KEY_RSA:
+ if ((pk->rsa = RSA_new()) == NULL)
+ fatal("key_demote: RSA_new failed");
+ if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ break;
+ case KEY_DSA:
+ if ((pk->dsa = DSA_new()) == NULL)
+ fatal("key_demote: DSA_new failed");
+ if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
+ fatal("key_demote: BN_dup failed");
+ break;
+ default:
+ fatal("key_free: bad key type %d", k->type);
+ break;
+ }
+
+ return (pk);
+}