Added export of ssh.com key files.

[u/mdw/putty] / sshpubk.c

diff --git a/sshpubk.c b/sshpubk.c
index aa65d98..8a9b75d 100644 (file)
--- a/sshpubk.c
+++ b/sshpubk.c
@@ -973,23 +973,25 @@ void base64_encode_atom(unsigned char *data, int n, char *out)
        out[3] = '=';
 }
 
-void base64_encode(FILE * fp, unsigned char *data, int datalen)
+void base64_encode(FILE * fp, unsigned char *data, int datalen, int cpl)
 {
     int linelen = 0;
     char out[4];
-    int n;
+    int n, i;
 
     while (datalen > 0) {
-       if (linelen >= 64) {
-           linelen = 0;
-           fputc('\n', fp);
-       }
        n = (datalen < 3 ? datalen : 3);
        base64_encode_atom(data, n, out);
        data += n;
        datalen -= n;
-       fwrite(out, 1, 4, fp);
-       linelen += 4;
+       for (i = 0; i < 4; i++) {
+           if (linelen >= cpl) {
+               linelen = 0;
+               fputc('\n', fp);
+           }
+           fputc(out[i], fp);
+           linelen++;
+       }
     }
     fputc('\n', fp);
 }
@@ -1105,9 +1107,9 @@ int ssh2_save_userkey(char *filename, struct ssh2_userkey *key,
     fprintf(fp, "Encryption: %s\n", cipherstr);
     fprintf(fp, "Comment: %s\n", key->comment);
     fprintf(fp, "Public-Lines: %d\n", base64_lines(pub_blob_len));
-    base64_encode(fp, pub_blob, pub_blob_len);
+    base64_encode(fp, pub_blob, pub_blob_len, 64);
     fprintf(fp, "Private-Lines: %d\n", base64_lines(priv_encrypted_len));
-    base64_encode(fp, priv_blob_encrypted, priv_encrypted_len);
+    base64_encode(fp, priv_blob_encrypted, priv_encrypted_len, 64);
     fprintf(fp, "Private-MAC: ");
     for (i = 0; i < 20; i++)
        fprintf(fp, "%02x", priv_mac[i]);
@@ -1122,22 +1124,51 @@ int ssh2_save_userkey(char *filename, struct ssh2_userkey *key,
 }
 
 /* ----------------------------------------------------------------------
- * A function to determine which version of SSH to try on a private
- * key file. Returns 0 on failure, 1 or 2 on success.
+ * A function to determine the type of a private key file. Returns
+ * 0 on failure, 1 or 2 on success.
  */
-int keyfile_version(char *filename)
+int key_type(char *filename)
 {
     FILE *fp;
+    char buf[32];
+    const char putty2_sig[] = "PuTTY-User-Key-File-";
+    const char sshcom_sig[] = "---- BEGIN SSH2 ENCRYPTED PRIVAT";
+    const char openssh_sig[] = "-----BEGIN ";
     int i;
 
     fp = fopen(filename, "r");
     if (!fp)
-       return 0;
-    i = fgetc(fp);
+       return SSH_KEYTYPE_UNOPENABLE;
+    i = fread(buf, 1, sizeof(buf), fp);
     fclose(fp);
-    if (i == 'S')
-       return 1;                      /* "SSH PRIVATE KEY FORMAT" etc */
-    if (i == 'P')                     /* "PuTTY-User-Key-File" etc */
-       return 2;
-    return 0;                         /* unrecognised or EOF */
+    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;
+    }
 }