+ if (i < 0)
+ return SSH_KEYTYPE_UNOPENABLE;
+ if (i < 32)
+ return SSH_KEYTYPE_UNKNOWN;
+ if (!memcmp(buf, rsa_signature, sizeof(rsa_signature)-1))
+ return SSH_KEYTYPE_SSH1;
+ if (!memcmp(buf, putty2_sig, sizeof(putty2_sig)-1))
+ return SSH_KEYTYPE_SSH2;
+ if (!memcmp(buf, openssh_sig, sizeof(openssh_sig)-1))
+ return SSH_KEYTYPE_OPENSSH;
+ if (!memcmp(buf, sshcom_sig, sizeof(sshcom_sig)-1))
+ return SSH_KEYTYPE_SSHCOM;
+ return SSH_KEYTYPE_UNKNOWN; /* unrecognised or EOF */
+}
+
+/*
+ * Convert the type word to a string, for `wrong type' error
+ * messages.
+ */
+char *key_type_to_str(int type)
+{
+ switch (type) {
+ case SSH_KEYTYPE_UNOPENABLE: return "unable to open file"; break;
+ case SSH_KEYTYPE_UNKNOWN: return "not a private key"; break;
+ case SSH_KEYTYPE_SSH1: return "SSH1 private key"; break;
+ case SSH_KEYTYPE_SSH2: return "PuTTY SSH2 private key"; break;
+ case SSH_KEYTYPE_OPENSSH: return "OpenSSH SSH2 private key"; break;
+ case SSH_KEYTYPE_SSHCOM: return "ssh.com SSH2 private key"; break;
+ default: return "INTERNAL ERROR"; break;
+ }