2 * Generic SSH public-key handling operations. In particular,
3 * reading of SSH public-key files, and also the generic `sign'
4 * operation for ssh2 (which checks the type of the key and
5 * dispatches to the appropriate key-type specific function).
16 #define PUT_32BIT(cp, value) do { \
18 (cp)[2] = (value) >> 8; \
19 (cp)[1] = (value) >> 16; \
20 (cp)[0] = (value) >> 24; } while (0)
22 #define GET_32BIT(cp) \
23 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
24 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
25 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
26 ((unsigned long)(unsigned char)(cp)[3]))
28 #define rsa_signature "SSH PRIVATE KEY FILE FORMAT 1.1\n"
30 #define BASE64_TOINT(x) ( (x)-'A'<26 ? (x)-'A'+0 :\
31 (x)-'a'<26 ? (x)-'a'+26 :\
32 (x)-'0'<10 ? (x)-'0'+52 :\
36 static int loadrsakey_main(FILE * fp, struct RSAKey *key, int pub_only,
37 char **commentptr, char *passphrase)
39 unsigned char buf[16384];
40 unsigned char keybuf[16];
44 struct MD5Context md5c;
47 /* Slurp the whole file (minus the header) into a buffer. */
48 len = fread(buf, 1, sizeof(buf), fp);
50 if (len < 0 || len == sizeof(buf))
51 goto end; /* file too big or not read */
56 * A zero byte. (The signature includes a terminating NUL.)
58 if (len - i < 1 || buf[i] != 0)
62 /* One byte giving encryption type, and one reserved uint32. */
66 if (ciphertype != 0 && ciphertype != SSH_CIPHER_3DES)
70 goto end; /* reserved field not present */
71 if (buf[i] != 0 || buf[i + 1] != 0 || buf[i + 2] != 0
72 || buf[i + 3] != 0) goto end; /* reserved field nonzero, panic! */
75 /* Now the serious stuff. An ordinary SSH 1 public key. */
76 i += makekey(buf + i, key, NULL, 1);
78 goto end; /* overran */
85 /* Next, the comment field. */
86 j = GET_32BIT(buf + i);
90 comment = smalloc(j + 1);
92 memcpy(comment, buf + i, j);
97 *commentptr = comment;
99 key->comment = comment;
101 return ciphertype != 0;
105 * Decrypt remainder of buffer.
109 MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase));
110 MD5Final(keybuf, &md5c);
111 des3_decrypt_pubkey(keybuf, buf + i, (len - i + 7) & ~7);
112 memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */
116 * We are now in the secret part of the key. The first four
117 * bytes should be of the form a, b, a, b.
121 if (buf[i] != buf[i + 2] || buf[i + 1] != buf[i + 3]) {
128 * After that, we have one further bignum which is our
129 * decryption exponent, and then the three auxiliary values
132 i += makeprivate(buf + i, key);
135 i += ssh1_read_bignum(buf + i, &key->iqmp);
138 i += ssh1_read_bignum(buf + i, &key->q);
141 i += ssh1_read_bignum(buf + i, &key->p);
145 if (!rsa_verify(key)) {
152 memset(buf, 0, sizeof(buf)); /* burn the evidence */
156 int loadrsakey(const Filename *filename, struct RSAKey *key, char *passphrase)
161 fp = f_open(*filename, "rb");
163 return 0; /* doesn't even exist */
166 * Read the first line of the file and see if it's a v1 private
169 if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) {
170 return loadrsakey_main(fp, key, FALSE, NULL, passphrase);
174 * Otherwise, we have nothing. Return empty-handed.
181 * See whether an RSA key is encrypted. Return its comment field as
184 int rsakey_encrypted(const Filename *filename, char **comment)
189 fp = f_open(*filename, "rb");
191 return 0; /* doesn't even exist */
194 * Read the first line of the file and see if it's a v1 private
197 if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) {
198 return loadrsakey_main(fp, NULL, FALSE, comment, NULL);
201 return 0; /* wasn't the right kind of file */
205 * Return a malloc'ed chunk of memory containing the public blob of
206 * an RSA key, as given in the agent protocol (modulus bits,
207 * exponent, modulus).
209 int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen)
216 /* Default return if we fail. */
221 fp = f_open(*filename, "rb");
223 return 0; /* doesn't even exist */
226 * Read the first line of the file and see if it's a v1 private
229 if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) {
230 memset(&key, 0, sizeof(key));
231 if (loadrsakey_main(fp, &key, TRUE, NULL, NULL)) {
232 *blob = rsa_public_blob(&key, bloblen);
242 * Save an RSA key file. Return nonzero on success.
244 int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase)
246 unsigned char buf[16384];
247 unsigned char keybuf[16];
248 struct MD5Context md5c;
249 unsigned char *p, *estart;
253 * Write the initial signature.
256 memcpy(p, rsa_signature, sizeof(rsa_signature));
257 p += sizeof(rsa_signature);
260 * One byte giving encryption type, and one reserved (zero)
263 *p++ = (passphrase ? SSH_CIPHER_3DES : 0);
268 * An ordinary SSH 1 public key consists of: a uint32
269 * containing the bit count, then two bignums containing the
270 * modulus and exponent respectively.
272 PUT_32BIT(p, bignum_bitcount(key->modulus));
274 p += ssh1_write_bignum(p, key->modulus);
275 p += ssh1_write_bignum(p, key->exponent);
278 * A string containing the comment field.
281 PUT_32BIT(p, strlen(key->comment));
283 memcpy(p, key->comment, strlen(key->comment));
284 p += strlen(key->comment);
291 * The encrypted portion starts here.
296 * Two bytes, then the same two bytes repeated.
298 *p++ = random_byte();
299 *p++ = random_byte();
305 * Four more bignums: the decryption exponent, then iqmp, then
308 p += ssh1_write_bignum(p, key->private_exponent);
309 p += ssh1_write_bignum(p, key->iqmp);
310 p += ssh1_write_bignum(p, key->q);
311 p += ssh1_write_bignum(p, key->p);
314 * Now write zeros until the encrypted portion is a multiple of
317 while ((p - estart) % 8)
321 * Now encrypt the encrypted portion.
325 MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase));
326 MD5Final(keybuf, &md5c);
327 des3_encrypt_pubkey(keybuf, estart, p - estart);
328 memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */
332 * Done. Write the result to the file.
334 fp = f_open(*filename, "wb");
336 int ret = (fwrite(buf, 1, p - buf, fp) == (size_t) (p - buf));
337 ret = ret && (fclose(fp) == 0);
343 /* ----------------------------------------------------------------------
344 * SSH2 private key load/store functions.
348 * PuTTY's own format for SSH2 keys is as follows:
350 * The file is text. Lines are terminated by CRLF, although CR-only
351 * and LF-only are tolerated on input.
353 * The first line says "PuTTY-User-Key-File-2: " plus the name of the
354 * algorithm ("ssh-dss", "ssh-rsa" etc).
356 * The next line says "Encryption: " plus an encryption type.
357 * Currently the only supported encryption types are "aes256-cbc"
360 * The next line says "Comment: " plus the comment string.
362 * Next there is a line saying "Public-Lines: " plus a number N.
363 * The following N lines contain a base64 encoding of the public
364 * part of the key. This is encoded as the standard SSH2 public key
365 * blob (with no initial length): so for RSA, for example, it will
372 * Next, there is a line saying "Private-Lines: " plus a number N,
373 * and then N lines containing the (potentially encrypted) private
374 * part of the key. For the key type "ssh-rsa", this will be
377 * mpint private_exponent
378 * mpint p (the larger of the two primes)
379 * mpint q (the smaller prime)
380 * mpint iqmp (the inverse of q modulo p)
381 * data padding (to reach a multiple of the cipher block size)
383 * And for "ssh-dss", it will be composed of
385 * mpint x (the private key parameter)
386 * [ string hash 20-byte hash of mpints p || q || g only in old format ]
388 * Finally, there is a line saying "Private-MAC: " plus a hex
389 * representation of a HMAC-SHA-1 of:
391 * string name of algorithm ("ssh-dss", "ssh-rsa")
392 * string encryption type
395 * string private-plaintext (the plaintext version of the
396 * private part, including the final
399 * The key to the MAC is itself a SHA-1 hash of:
401 * data "putty-private-key-file-mac-key"
404 * Encrypted keys should have a MAC, whereas unencrypted ones must
407 * If the key is encrypted, the encryption key is derived from the
408 * passphrase by means of a succession of SHA-1 hashes. Each hash
411 * uint32 sequence-number
414 * where the sequence-number increases from zero. As many of these
415 * hashes are used as necessary.
417 * For backwards compatibility with snapshots between 0.51 and
418 * 0.52, we also support the older key file format, which begins
419 * with "PuTTY-User-Key-File-1" (version number differs). In this
420 * format the Private-MAC: field only covers the private-plaintext
421 * field and nothing else (and without the 4-byte string length on
422 * the front too). Moreover, for RSA keys the Private-MAC: field
423 * can be replaced with a Private-Hash: field which is a plain
424 * SHA-1 hash instead of an HMAC. This is not allowable in DSA
425 * keys. (Yes, the old format was a mess. Guess why it changed :-)
428 static int read_header(FILE * fp, char *header)
435 if (c == '\n' || c == '\r' || c == EOF)
436 return 0; /* failure */
442 return 1; /* success! */
445 return 0; /* failure */
449 return 0; /* failure */
452 static char *read_body(FILE * fp)
460 text = smalloc(size);
466 if (c == '\r' || c == '\n') {
468 if (c != '\r' && c != '\n' && c != EOF)
476 if (len + 1 > size) {
478 text = srealloc(text, size);
485 int base64_decode_atom(char *atom, unsigned char *out)
492 for (i = 0; i < 4; i++) {
494 if (c >= 'A' && c <= 'Z')
496 else if (c >= 'a' && c <= 'z')
498 else if (c >= '0' && c <= '9')
507 return 0; /* invalid atom */
511 if (vals[0] == -1 || vals[1] == -1)
513 if (vals[2] == -1 && vals[3] != -1)
518 else if (vals[2] != -1)
523 word = ((vals[0] << 18) |
524 (vals[1] << 12) | ((vals[2] & 0x3F) << 6) | (vals[3] & 0x3F));
525 out[0] = (word >> 16) & 0xFF;
527 out[1] = (word >> 8) & 0xFF;
529 out[2] = word & 0xFF;
533 static unsigned char *read_blob(FILE * fp, int nlines, int *bloblen)
540 /* We expect at most 64 base64 characters, ie 48 real bytes, per line. */
541 blob = smalloc(48 * nlines);
543 for (i = 0; i < nlines; i++) {
544 line = read_body(fp);
549 linelen = strlen(line);
550 if (linelen % 4 != 0 || linelen > 64) {
555 for (j = 0; j < linelen; j += 4) {
556 k = base64_decode_atom(line + j, blob + len);
571 * Magic error return value for when the passphrase is wrong.
573 struct ssh2_userkey ssh2_wrong_passphrase = {
577 struct ssh2_userkey *ssh2_load_userkey(const Filename *filename,
581 char header[40], *b, *encryption, *comment, *mac;
582 const struct ssh_signkey *alg;
583 struct ssh2_userkey *ret;
584 int cipher, cipherblk;
585 unsigned char *public_blob, *private_blob;
586 int public_blob_len, private_blob_len;
587 int i, is_mac, old_fmt;
588 int passlen = passphrase ? strlen(passphrase) : 0;
590 ret = NULL; /* return NULL for most errors */
591 encryption = comment = mac = NULL;
592 public_blob = private_blob = NULL;
594 fp = f_open(*filename, "rb");
598 /* Read the first header line which contains the key type. */
599 if (!read_header(fp, header))
601 if (0 == strcmp(header, "PuTTY-User-Key-File-2")) {
603 } else if (0 == strcmp(header, "PuTTY-User-Key-File-1")) {
604 /* this is an old key file; warn and then continue */
605 old_keyfile_warning();
609 if ((b = read_body(fp)) == NULL)
611 /* Select key algorithm structure. */
612 if (!strcmp(b, "ssh-rsa"))
614 else if (!strcmp(b, "ssh-dss"))
622 /* Read the Encryption header line. */
623 if (!read_header(fp, header) || 0 != strcmp(header, "Encryption"))
625 if ((encryption = read_body(fp)) == NULL)
627 if (!strcmp(encryption, "aes256-cbc")) {
630 } else if (!strcmp(encryption, "none")) {
638 /* Read the Comment header line. */
639 if (!read_header(fp, header) || 0 != strcmp(header, "Comment"))
641 if ((comment = read_body(fp)) == NULL)
644 /* Read the Public-Lines header line and the public blob. */
645 if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines"))
647 if ((b = read_body(fp)) == NULL)
651 if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL)
654 /* Read the Private-Lines header line and the Private blob. */
655 if (!read_header(fp, header) || 0 != strcmp(header, "Private-Lines"))
657 if ((b = read_body(fp)) == NULL)
661 if ((private_blob = read_blob(fp, i, &private_blob_len)) == NULL)
664 /* Read the Private-MAC or Private-Hash header line. */
665 if (!read_header(fp, header))
667 if (0 == strcmp(header, "Private-MAC")) {
668 if ((mac = read_body(fp)) == NULL)
671 } else if (0 == strcmp(header, "Private-Hash") &&
672 alg == &ssh_rsa && old_fmt) {
673 if ((mac = read_body(fp)) == NULL)
683 * Decrypt the private blob.
686 unsigned char key[40];
691 if (private_blob_len % cipherblk)
695 SHA_Bytes(&s, "\0\0\0\0", 4);
696 SHA_Bytes(&s, passphrase, passlen);
697 SHA_Final(&s, key + 0);
699 SHA_Bytes(&s, "\0\0\0\1", 4);
700 SHA_Bytes(&s, passphrase, passlen);
701 SHA_Final(&s, key + 20);
702 aes256_decrypt_pubkey(key, private_blob, private_blob_len);
710 unsigned char binary[20];
711 unsigned char *macdata;
716 /* MAC (or hash) only covers the private blob. */
717 macdata = private_blob;
718 maclen = private_blob_len;
722 int namelen = strlen(alg->name);
723 int enclen = strlen(encryption);
724 int commlen = strlen(comment);
725 maclen = (4 + namelen +
728 4 + public_blob_len +
729 4 + private_blob_len);
730 macdata = smalloc(maclen);
732 #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len)
733 DO_STR(alg->name, namelen);
734 DO_STR(encryption, enclen);
735 DO_STR(comment, commlen);
736 DO_STR(public_blob, public_blob_len);
737 DO_STR(private_blob, private_blob_len);
744 unsigned char mackey[20];
745 char header[] = "putty-private-key-file-mac-key";
748 SHA_Bytes(&s, header, sizeof(header)-1);
750 SHA_Bytes(&s, passphrase, passlen);
751 SHA_Final(&s, mackey);
753 hmac_sha1_simple(mackey, 20, macdata, maclen, binary);
755 memset(mackey, 0, sizeof(mackey));
756 memset(&s, 0, sizeof(s));
758 SHA_Simple(macdata, maclen, binary);
762 memset(macdata, 0, maclen);
766 for (i = 0; i < 20; i++)
767 sprintf(realmac + 2 * i, "%02x", binary[i]);
769 if (strcmp(mac, realmac)) {
770 /* An incorrect MAC is an unconditional Error if the key is
771 * unencrypted. Otherwise, it means Wrong Passphrase. */
772 ret = cipher ? SSH2_WRONG_PASSPHRASE : NULL;
779 * Create and return the key.
781 ret = smalloc(sizeof(struct ssh2_userkey));
783 ret->comment = comment;
784 ret->data = alg->createkey(public_blob, public_blob_len,
785 private_blob, private_blob_len);
815 char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm,
820 const struct ssh_signkey *alg;
821 unsigned char *public_blob;
827 fp = f_open(*filename, "rb");
831 /* Read the first header line which contains the key type. */
832 if (!read_header(fp, header)
833 || (0 != strcmp(header, "PuTTY-User-Key-File-2") &&
834 0 != strcmp(header, "PuTTY-User-Key-File-1")))
836 if ((b = read_body(fp)) == NULL)
838 /* Select key algorithm structure. Currently only ssh-rsa. */
839 if (!strcmp(b, "ssh-rsa"))
841 else if (!strcmp(b, "ssh-dss"))
849 /* Read the Encryption header line. */
850 if (!read_header(fp, header) || 0 != strcmp(header, "Encryption"))
852 if ((b = read_body(fp)) == NULL)
854 sfree(b); /* we don't care */
856 /* Read the Comment header line. */
857 if (!read_header(fp, header) || 0 != strcmp(header, "Comment"))
859 if ((b = read_body(fp)) == NULL)
861 sfree(b); /* we don't care */
863 /* Read the Public-Lines header line and the public blob. */
864 if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines"))
866 if ((b = read_body(fp)) == NULL)
870 if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL)
875 *pub_blob_len = public_blob_len;
877 *algorithm = alg->name;
878 return (char *)public_blob;
891 int ssh2_userkey_encrypted(const Filename *filename, char **commentptr)
894 char header[40], *b, *comment;
900 fp = f_open(*filename, "rb");
903 if (!read_header(fp, header)
904 || (0 != strcmp(header, "PuTTY-User-Key-File-2") &&
905 0 != strcmp(header, "PuTTY-User-Key-File-1"))) {
909 if ((b = read_body(fp)) == NULL) {
913 sfree(b); /* we don't care about key type here */
914 /* Read the Encryption header line. */
915 if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) {
919 if ((b = read_body(fp)) == NULL) {
924 /* Read the Comment header line. */
925 if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) {
930 if ((comment = read_body(fp)) == NULL) {
937 *commentptr = comment;
940 if (!strcmp(b, "aes256-cbc"))
948 int base64_lines(int datalen)
950 /* When encoding, we use 64 chars/line, which equals 48 real chars. */
951 return (datalen + 47) / 48;
954 void base64_encode(FILE * fp, unsigned char *data, int datalen, int cpl)
960 while (datalen > 0) {
961 n = (datalen < 3 ? datalen : 3);
962 base64_encode_atom(data, n, out);
965 for (i = 0; i < 4; i++) {
966 if (linelen >= cpl) {
977 int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key,
981 unsigned char *pub_blob, *priv_blob, *priv_blob_encrypted;
982 int pub_blob_len, priv_blob_len, priv_encrypted_len;
987 unsigned char priv_mac[20];
990 * Fetch the key component blobs.
992 pub_blob = key->alg->public_blob(key->data, &pub_blob_len);
993 priv_blob = key->alg->private_blob(key->data, &priv_blob_len);
994 if (!pub_blob || !priv_blob) {
1001 * Determine encryption details, and encrypt the private blob.
1004 cipherstr = "aes256-cbc";
1010 priv_encrypted_len = priv_blob_len + cipherblk - 1;
1011 priv_encrypted_len -= priv_encrypted_len % cipherblk;
1012 priv_blob_encrypted = smalloc(priv_encrypted_len);
1013 memset(priv_blob_encrypted, 0, priv_encrypted_len);
1014 memcpy(priv_blob_encrypted, priv_blob, priv_blob_len);
1015 /* Create padding based on the SHA hash of the unpadded blob. This prevents
1016 * too easy a known-plaintext attack on the last block. */
1017 SHA_Simple(priv_blob, priv_blob_len, priv_mac);
1018 assert(priv_encrypted_len - priv_blob_len < 20);
1019 memcpy(priv_blob_encrypted + priv_blob_len, priv_mac,
1020 priv_encrypted_len - priv_blob_len);
1022 /* Now create the MAC. */
1024 unsigned char *macdata;
1027 int namelen = strlen(key->alg->name);
1028 int enclen = strlen(cipherstr);
1029 int commlen = strlen(key->comment);
1031 unsigned char mackey[20];
1032 char header[] = "putty-private-key-file-mac-key";
1034 maclen = (4 + namelen +
1038 4 + priv_encrypted_len);
1039 macdata = smalloc(maclen);
1041 #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len)
1042 DO_STR(key->alg->name, namelen);
1043 DO_STR(cipherstr, enclen);
1044 DO_STR(key->comment, commlen);
1045 DO_STR(pub_blob, pub_blob_len);
1046 DO_STR(priv_blob_encrypted, priv_encrypted_len);
1049 SHA_Bytes(&s, header, sizeof(header)-1);
1051 SHA_Bytes(&s, passphrase, strlen(passphrase));
1052 SHA_Final(&s, mackey);
1053 hmac_sha1_simple(mackey, 20, macdata, maclen, priv_mac);
1054 memset(macdata, 0, maclen);
1056 memset(mackey, 0, sizeof(mackey));
1057 memset(&s, 0, sizeof(s));
1061 unsigned char key[40];
1064 passlen = strlen(passphrase);
1067 SHA_Bytes(&s, "\0\0\0\0", 4);
1068 SHA_Bytes(&s, passphrase, passlen);
1069 SHA_Final(&s, key + 0);
1071 SHA_Bytes(&s, "\0\0\0\1", 4);
1072 SHA_Bytes(&s, passphrase, passlen);
1073 SHA_Final(&s, key + 20);
1074 aes256_encrypt_pubkey(key, priv_blob_encrypted,
1075 priv_encrypted_len);
1077 memset(key, 0, sizeof(key));
1078 memset(&s, 0, sizeof(s));
1081 fp = f_open(*filename, "w");
1084 fprintf(fp, "PuTTY-User-Key-File-2: %s\n", key->alg->name);
1085 fprintf(fp, "Encryption: %s\n", cipherstr);
1086 fprintf(fp, "Comment: %s\n", key->comment);
1087 fprintf(fp, "Public-Lines: %d\n", base64_lines(pub_blob_len));
1088 base64_encode(fp, pub_blob, pub_blob_len, 64);
1089 fprintf(fp, "Private-Lines: %d\n", base64_lines(priv_encrypted_len));
1090 base64_encode(fp, priv_blob_encrypted, priv_encrypted_len, 64);
1091 fprintf(fp, "Private-MAC: ");
1092 for (i = 0; i < 20; i++)
1093 fprintf(fp, "%02x", priv_mac[i]);
1098 memset(priv_blob, 0, priv_blob_len);
1100 sfree(priv_blob_encrypted);
1104 /* ----------------------------------------------------------------------
1105 * A function to determine the type of a private key file. Returns
1106 * 0 on failure, 1 or 2 on success.
1108 int key_type(const Filename *filename)
1112 const char putty2_sig[] = "PuTTY-User-Key-File-";
1113 const char sshcom_sig[] = "---- BEGIN SSH2 ENCRYPTED PRIVAT";
1114 const char openssh_sig[] = "-----BEGIN ";
1117 fp = f_open(*filename, "r");
1119 return SSH_KEYTYPE_UNOPENABLE;
1120 i = fread(buf, 1, sizeof(buf), fp);
1123 return SSH_KEYTYPE_UNOPENABLE;
1125 return SSH_KEYTYPE_UNKNOWN;
1126 if (!memcmp(buf, rsa_signature, sizeof(rsa_signature)-1))
1127 return SSH_KEYTYPE_SSH1;
1128 if (!memcmp(buf, putty2_sig, sizeof(putty2_sig)-1))
1129 return SSH_KEYTYPE_SSH2;
1130 if (!memcmp(buf, openssh_sig, sizeof(openssh_sig)-1))
1131 return SSH_KEYTYPE_OPENSSH;
1132 if (!memcmp(buf, sshcom_sig, sizeof(sshcom_sig)-1))
1133 return SSH_KEYTYPE_SSHCOM;
1134 return SSH_KEYTYPE_UNKNOWN; /* unrecognised or EOF */
1138 * Convert the type word to a string, for `wrong type' error
1141 char *key_type_to_str(int type)
1144 case SSH_KEYTYPE_UNOPENABLE: return "unable to open file"; break;
1145 case SSH_KEYTYPE_UNKNOWN: return "not a private key"; break;
1146 case SSH_KEYTYPE_SSH1: return "SSH1 private key"; break;
1147 case SSH_KEYTYPE_SSH2: return "PuTTY SSH2 private key"; break;
1148 case SSH_KEYTYPE_OPENSSH: return "OpenSSH SSH2 private key"; break;
1149 case SSH_KEYTYPE_SSHCOM: return "ssh.com SSH2 private key"; break;
1150 default: return "INTERNAL ERROR"; break;