2 * Generic SSH public-key handling operations. In particular,
3 * reading of SSH public-key files, and also the generic `sign'
4 * operation for SSH-2 (which checks the type of the key and
5 * dispatches to the appropriate key-type specific function).
16 #define rsa_signature "SSH PRIVATE KEY FILE FORMAT 1.1\n"
18 #define BASE64_TOINT(x) ( (x)-'A'<26 ? (x)-'A'+0 :\
19 (x)-'a'<26 ? (x)-'a'+26 :\
20 (x)-'0'<10 ? (x)-'0'+52 :\
24 static int loadrsakey_main(FILE * fp
, struct RSAKey
*key
, int pub_only
,
25 char **commentptr
, char *passphrase
,
28 unsigned char buf
[16384];
29 unsigned char keybuf
[16];
33 struct MD5Context md5c
;
38 /* Slurp the whole file (minus the header) into a buffer. */
39 len
= fread(buf
, 1, sizeof(buf
), fp
);
41 if (len
< 0 || len
== sizeof(buf
)) {
42 *error
= "error reading file";
43 goto end
; /* file too big or not read */
47 *error
= "file format error";
50 * A zero byte. (The signature includes a terminating NUL.)
52 if (len
- i
< 1 || buf
[i
] != 0)
56 /* One byte giving encryption type, and one reserved uint32. */
60 if (ciphertype
!= 0 && ciphertype
!= SSH_CIPHER_3DES
)
64 goto end
; /* reserved field not present */
65 if (buf
[i
] != 0 || buf
[i
+ 1] != 0 || buf
[i
+ 2] != 0
66 || buf
[i
+ 3] != 0) goto end
; /* reserved field nonzero, panic! */
69 /* Now the serious stuff. An ordinary SSH-1 public key. */
70 i
+= makekey(buf
+ i
, len
, key
, NULL
, 1);
72 goto end
; /* overran */
79 /* Next, the comment field. */
80 j
= GET_32BIT(buf
+ i
);
84 comment
= snewn(j
+ 1, char);
86 memcpy(comment
, buf
+ i
, j
);
91 *commentptr
= comment
;
93 key
->comment
= comment
;
95 ret
= ciphertype
!= 0;
101 * Decrypt remainder of buffer.
105 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
106 MD5Final(keybuf
, &md5c
);
107 des3_decrypt_pubkey(keybuf
, buf
+ i
, (len
- i
+ 7) & ~7);
108 memset(keybuf
, 0, sizeof(keybuf
)); /* burn the evidence */
112 * We are now in the secret part of the key. The first four
113 * bytes should be of the form a, b, a, b.
117 if (buf
[i
] != buf
[i
+ 2] || buf
[i
+ 1] != buf
[i
+ 3]) {
118 *error
= "wrong passphrase";
125 * After that, we have one further bignum which is our
126 * decryption exponent, and then the three auxiliary values
129 j
= makeprivate(buf
+ i
, len
- i
, key
);
132 j
= ssh1_read_bignum(buf
+ i
, len
- i
, &key
->iqmp
);
135 j
= ssh1_read_bignum(buf
+ i
, len
- i
, &key
->q
);
138 j
= ssh1_read_bignum(buf
+ i
, len
- i
, &key
->p
);
142 if (!rsa_verify(key
)) {
143 *error
= "rsa_verify failed";
150 memset(buf
, 0, sizeof(buf
)); /* burn the evidence */
154 int loadrsakey(const Filename
*filename
, struct RSAKey
*key
, char *passphrase
,
155 const char **errorstr
)
160 const char *error
= NULL
;
162 fp
= f_open(*filename
, "rb");
164 error
= "can't open file";
169 * Read the first line of the file and see if it's a v1 private
172 if (fgets(buf
, sizeof(buf
), fp
) && !strcmp(buf
, rsa_signature
)) {
174 * This routine will take care of calling fclose() for us.
176 ret
= loadrsakey_main(fp
, key
, FALSE
, NULL
, passphrase
, &error
);
182 * Otherwise, we have nothing. Return empty-handed.
184 error
= "not an SSH-1 RSA file";
189 if ((ret
!= 1) && errorstr
)
195 * See whether an RSA key is encrypted. Return its comment field as
198 int rsakey_encrypted(const Filename
*filename
, char **comment
)
203 fp
= f_open(*filename
, "rb");
205 return 0; /* doesn't even exist */
208 * Read the first line of the file and see if it's a v1 private
211 if (fgets(buf
, sizeof(buf
), fp
) && !strcmp(buf
, rsa_signature
)) {
214 * This routine will take care of calling fclose() for us.
216 return loadrsakey_main(fp
, NULL
, FALSE
, comment
, NULL
, &dummy
);
219 return 0; /* wasn't the right kind of file */
223 * Return a malloc'ed chunk of memory containing the public blob of
224 * an RSA key, as given in the agent protocol (modulus bits,
225 * exponent, modulus).
227 int rsakey_pubblob(const Filename
*filename
, void **blob
, int *bloblen
,
228 const char **errorstr
)
234 const char *error
= NULL
;
236 /* Default return if we fail. */
241 fp
= f_open(*filename
, "rb");
243 error
= "can't open file";
248 * Read the first line of the file and see if it's a v1 private
251 if (fgets(buf
, sizeof(buf
), fp
) && !strcmp(buf
, rsa_signature
)) {
252 memset(&key
, 0, sizeof(key
));
253 if (loadrsakey_main(fp
, &key
, TRUE
, NULL
, NULL
, &error
)) {
254 *blob
= rsa_public_blob(&key
, bloblen
);
260 error
= "not an SSH-1 RSA file";
266 if ((ret
!= 1) && errorstr
)
272 * Save an RSA key file. Return nonzero on success.
274 int saversakey(const Filename
*filename
, struct RSAKey
*key
, char *passphrase
)
276 unsigned char buf
[16384];
277 unsigned char keybuf
[16];
278 struct MD5Context md5c
;
279 unsigned char *p
, *estart
;
283 * Write the initial signature.
286 memcpy(p
, rsa_signature
, sizeof(rsa_signature
));
287 p
+= sizeof(rsa_signature
);
290 * One byte giving encryption type, and one reserved (zero)
293 *p
++ = (passphrase ? SSH_CIPHER_3DES
: 0);
298 * An ordinary SSH-1 public key consists of: a uint32
299 * containing the bit count, then two bignums containing the
300 * modulus and exponent respectively.
302 PUT_32BIT(p
, bignum_bitcount(key
->modulus
));
304 p
+= ssh1_write_bignum(p
, key
->modulus
);
305 p
+= ssh1_write_bignum(p
, key
->exponent
);
308 * A string containing the comment field.
311 PUT_32BIT(p
, strlen(key
->comment
));
313 memcpy(p
, key
->comment
, strlen(key
->comment
));
314 p
+= strlen(key
->comment
);
321 * The encrypted portion starts here.
326 * Two bytes, then the same two bytes repeated.
328 *p
++ = random_byte();
329 *p
++ = random_byte();
335 * Four more bignums: the decryption exponent, then iqmp, then
338 p
+= ssh1_write_bignum(p
, key
->private_exponent
);
339 p
+= ssh1_write_bignum(p
, key
->iqmp
);
340 p
+= ssh1_write_bignum(p
, key
->q
);
341 p
+= ssh1_write_bignum(p
, key
->p
);
344 * Now write zeros until the encrypted portion is a multiple of
347 while ((p
- estart
) % 8)
351 * Now encrypt the encrypted portion.
355 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
356 MD5Final(keybuf
, &md5c
);
357 des3_encrypt_pubkey(keybuf
, estart
, p
- estart
);
358 memset(keybuf
, 0, sizeof(keybuf
)); /* burn the evidence */
362 * Done. Write the result to the file.
364 fp
= f_open(*filename
, "wb");
366 int ret
= (fwrite(buf
, 1, p
- buf
, fp
) == (size_t) (p
- buf
));
374 /* ----------------------------------------------------------------------
375 * SSH-2 private key load/store functions.
379 * PuTTY's own format for SSH-2 keys is as follows:
381 * The file is text. Lines are terminated by CRLF, although CR-only
382 * and LF-only are tolerated on input.
384 * The first line says "PuTTY-User-Key-File-2: " plus the name of the
385 * algorithm ("ssh-dss", "ssh-rsa" etc).
387 * The next line says "Encryption: " plus an encryption type.
388 * Currently the only supported encryption types are "aes256-cbc"
391 * The next line says "Comment: " plus the comment string.
393 * Next there is a line saying "Public-Lines: " plus a number N.
394 * The following N lines contain a base64 encoding of the public
395 * part of the key. This is encoded as the standard SSH-2 public key
396 * blob (with no initial length): so for RSA, for example, it will
403 * Next, there is a line saying "Private-Lines: " plus a number N,
404 * and then N lines containing the (potentially encrypted) private
405 * part of the key. For the key type "ssh-rsa", this will be
408 * mpint private_exponent
409 * mpint p (the larger of the two primes)
410 * mpint q (the smaller prime)
411 * mpint iqmp (the inverse of q modulo p)
412 * data padding (to reach a multiple of the cipher block size)
414 * And for "ssh-dss", it will be composed of
416 * mpint x (the private key parameter)
417 * [ string hash 20-byte hash of mpints p || q || g only in old format ]
419 * Finally, there is a line saying "Private-MAC: " plus a hex
420 * representation of a HMAC-SHA-1 of:
422 * string name of algorithm ("ssh-dss", "ssh-rsa")
423 * string encryption type
426 * string private-plaintext (the plaintext version of the
427 * private part, including the final
430 * The key to the MAC is itself a SHA-1 hash of:
432 * data "putty-private-key-file-mac-key"
435 * (An empty passphrase is used for unencrypted keys.)
437 * If the key is encrypted, the encryption key is derived from the
438 * passphrase by means of a succession of SHA-1 hashes. Each hash
441 * uint32 sequence-number
444 * where the sequence-number increases from zero. As many of these
445 * hashes are used as necessary.
447 * For backwards compatibility with snapshots between 0.51 and
448 * 0.52, we also support the older key file format, which begins
449 * with "PuTTY-User-Key-File-1" (version number differs). In this
450 * format the Private-MAC: field only covers the private-plaintext
451 * field and nothing else (and without the 4-byte string length on
452 * the front too). Moreover, the Private-MAC: field can be replaced
453 * with a Private-Hash: field which is a plain SHA-1 hash instead of
454 * an HMAC (this was generated for unencrypted keys).
457 static int read_header(FILE * fp
, char *header
)
464 if (c
== '\n' || c
== '\r' || c
== EOF
)
465 return 0; /* failure */
471 return 1; /* success! */
474 return 0; /* failure */
478 return 0; /* failure */
481 static char *read_body(FILE * fp
)
489 text
= snewn(size
, char);
495 if (c
== '\r' || c
== '\n') {
497 if (c
!= '\r' && c
!= '\n' && c
!= EOF
)
505 if (len
+ 1 >= size
) {
507 text
= sresize(text
, size
, char);
514 int base64_decode_atom(char *atom
, unsigned char *out
)
521 for (i
= 0; i
< 4; i
++) {
523 if (c
>= 'A' && c
<= 'Z')
525 else if (c
>= 'a' && c
<= 'z')
527 else if (c
>= '0' && c
<= '9')
536 return 0; /* invalid atom */
540 if (vals
[0] == -1 || vals
[1] == -1)
542 if (vals
[2] == -1 && vals
[3] != -1)
547 else if (vals
[2] != -1)
552 word
= ((vals
[0] << 18) |
553 (vals
[1] << 12) | ((vals
[2] & 0x3F) << 6) | (vals
[3] & 0x3F));
554 out
[0] = (word
>> 16) & 0xFF;
556 out
[1] = (word
>> 8) & 0xFF;
558 out
[2] = word
& 0xFF;
562 static unsigned char *read_blob(FILE * fp
, int nlines
, int *bloblen
)
569 /* We expect at most 64 base64 characters, ie 48 real bytes, per line. */
570 blob
= snewn(48 * nlines
, unsigned char);
572 for (i
= 0; i
< nlines
; i
++) {
573 line
= read_body(fp
);
578 linelen
= strlen(line
);
579 if (linelen
% 4 != 0 || linelen
> 64) {
584 for (j
= 0; j
< linelen
; j
+= 4) {
585 k
= base64_decode_atom(line
+ j
, blob
+ len
);
600 * Magic error return value for when the passphrase is wrong.
602 struct ssh2_userkey ssh2_wrong_passphrase
= {
606 const struct ssh_signkey
*find_pubkey_alg(const char *name
)
608 if (!strcmp(name
, "ssh-rsa"))
610 else if (!strcmp(name
, "ssh-dss"))
616 struct ssh2_userkey
*ssh2_load_userkey(const Filename
*filename
,
617 char *passphrase
, const char **errorstr
)
620 char header
[40], *b
, *encryption
, *comment
, *mac
;
621 const struct ssh_signkey
*alg
;
622 struct ssh2_userkey
*ret
;
623 int cipher
, cipherblk
;
624 unsigned char *public_blob
, *private_blob
;
625 int public_blob_len
, private_blob_len
;
626 int i
, is_mac
, old_fmt
;
627 int passlen
= passphrase ?
strlen(passphrase
) : 0;
628 const char *error
= NULL
;
630 ret
= NULL
; /* return NULL for most errors */
631 encryption
= comment
= mac
= NULL
;
632 public_blob
= private_blob
= NULL
;
634 fp
= f_open(*filename
, "rb");
636 error
= "can't open file";
640 /* Read the first header line which contains the key type. */
641 if (!read_header(fp
, header
))
643 if (0 == strcmp(header
, "PuTTY-User-Key-File-2")) {
645 } else if (0 == strcmp(header
, "PuTTY-User-Key-File-1")) {
646 /* this is an old key file; warn and then continue */
647 old_keyfile_warning();
650 error
= "not a PuTTY SSH-2 private key";
653 error
= "file format error";
654 if ((b
= read_body(fp
)) == NULL
)
656 /* Select key algorithm structure. */
657 alg
= find_pubkey_alg(b
);
664 /* Read the Encryption header line. */
665 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Encryption"))
667 if ((encryption
= read_body(fp
)) == NULL
)
669 if (!strcmp(encryption
, "aes256-cbc")) {
672 } else if (!strcmp(encryption
, "none")) {
680 /* Read the Comment header line. */
681 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Comment"))
683 if ((comment
= read_body(fp
)) == NULL
)
686 /* Read the Public-Lines header line and the public blob. */
687 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Public-Lines"))
689 if ((b
= read_body(fp
)) == NULL
)
693 if ((public_blob
= read_blob(fp
, i
, &public_blob_len
)) == NULL
)
696 /* Read the Private-Lines header line and the Private blob. */
697 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Private-Lines"))
699 if ((b
= read_body(fp
)) == NULL
)
703 if ((private_blob
= read_blob(fp
, i
, &private_blob_len
)) == NULL
)
706 /* Read the Private-MAC or Private-Hash header line. */
707 if (!read_header(fp
, header
))
709 if (0 == strcmp(header
, "Private-MAC")) {
710 if ((mac
= read_body(fp
)) == NULL
)
713 } else if (0 == strcmp(header
, "Private-Hash") && old_fmt
) {
714 if ((mac
= read_body(fp
)) == NULL
)
724 * Decrypt the private blob.
727 unsigned char key
[40];
732 if (private_blob_len
% cipherblk
)
736 SHA_Bytes(&s
, "\0\0\0\0", 4);
737 SHA_Bytes(&s
, passphrase
, passlen
);
738 SHA_Final(&s
, key
+ 0);
740 SHA_Bytes(&s
, "\0\0\0\1", 4);
741 SHA_Bytes(&s
, passphrase
, passlen
);
742 SHA_Final(&s
, key
+ 20);
743 aes256_decrypt_pubkey(key
, private_blob
, private_blob_len
);
751 unsigned char binary
[20];
752 unsigned char *macdata
;
757 /* MAC (or hash) only covers the private blob. */
758 macdata
= private_blob
;
759 maclen
= private_blob_len
;
763 int namelen
= strlen(alg
->name
);
764 int enclen
= strlen(encryption
);
765 int commlen
= strlen(comment
);
766 maclen
= (4 + namelen
+
769 4 + public_blob_len
+
770 4 + private_blob_len
);
771 macdata
= snewn(maclen
, unsigned char);
773 #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len)
774 DO_STR(alg
->name
, namelen
);
775 DO_STR(encryption
, enclen
);
776 DO_STR(comment
, commlen
);
777 DO_STR(public_blob
, public_blob_len
);
778 DO_STR(private_blob
, private_blob_len
);
785 unsigned char mackey
[20];
786 char header
[] = "putty-private-key-file-mac-key";
789 SHA_Bytes(&s
, header
, sizeof(header
)-1);
790 if (cipher
&& passphrase
)
791 SHA_Bytes(&s
, passphrase
, passlen
);
792 SHA_Final(&s
, mackey
);
794 hmac_sha1_simple(mackey
, 20, macdata
, maclen
, binary
);
796 memset(mackey
, 0, sizeof(mackey
));
797 memset(&s
, 0, sizeof(s
));
799 SHA_Simple(macdata
, maclen
, binary
);
803 memset(macdata
, 0, maclen
);
807 for (i
= 0; i
< 20; i
++)
808 sprintf(realmac
+ 2 * i
, "%02x", binary
[i
]);
810 if (strcmp(mac
, realmac
)) {
811 /* An incorrect MAC is an unconditional Error if the key is
812 * unencrypted. Otherwise, it means Wrong Passphrase. */
814 error
= "wrong passphrase";
815 ret
= SSH2_WRONG_PASSPHRASE
;
817 error
= "MAC failed";
826 * Create and return the key.
828 ret
= snew(struct ssh2_userkey
);
830 ret
->comment
= comment
;
831 ret
->data
= alg
->createkey(public_blob
, public_blob_len
,
832 private_blob
, private_blob_len
);
837 error
= "createkey failed";
868 char *ssh2_userkey_loadpub(const Filename
*filename
, char **algorithm
,
869 int *pub_blob_len
, const char **errorstr
)
873 const struct ssh_signkey
*alg
;
874 unsigned char *public_blob
;
877 const char *error
= NULL
;
881 fp
= f_open(*filename
, "rb");
883 error
= "can't open file";
887 /* Read the first header line which contains the key type. */
888 if (!read_header(fp
, header
)
889 || (0 != strcmp(header
, "PuTTY-User-Key-File-2") &&
890 0 != strcmp(header
, "PuTTY-User-Key-File-1"))) {
891 error
= "not a PuTTY SSH-2 private key";
894 error
= "file format error";
895 if ((b
= read_body(fp
)) == NULL
)
897 /* Select key algorithm structure. */
898 alg
= find_pubkey_alg(b
);
905 /* Read the Encryption header line. */
906 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Encryption"))
908 if ((b
= read_body(fp
)) == NULL
)
910 sfree(b
); /* we don't care */
912 /* Read the Comment header line. */
913 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Comment"))
915 if ((b
= read_body(fp
)) == NULL
)
917 sfree(b
); /* we don't care */
919 /* Read the Public-Lines header line and the public blob. */
920 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Public-Lines"))
922 if ((b
= read_body(fp
)) == NULL
)
926 if ((public_blob
= read_blob(fp
, i
, &public_blob_len
)) == NULL
)
931 *pub_blob_len
= public_blob_len
;
933 *algorithm
= alg
->name
;
934 return (char *)public_blob
;
949 int ssh2_userkey_encrypted(const Filename
*filename
, char **commentptr
)
952 char header
[40], *b
, *comment
;
958 fp
= f_open(*filename
, "rb");
961 if (!read_header(fp
, header
)
962 || (0 != strcmp(header
, "PuTTY-User-Key-File-2") &&
963 0 != strcmp(header
, "PuTTY-User-Key-File-1"))) {
967 if ((b
= read_body(fp
)) == NULL
) {
971 sfree(b
); /* we don't care about key type here */
972 /* Read the Encryption header line. */
973 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Encryption")) {
977 if ((b
= read_body(fp
)) == NULL
) {
982 /* Read the Comment header line. */
983 if (!read_header(fp
, header
) || 0 != strcmp(header
, "Comment")) {
988 if ((comment
= read_body(fp
)) == NULL
) {
995 *commentptr
= comment
;
998 if (!strcmp(b
, "aes256-cbc"))
1006 int base64_lines(int datalen
)
1008 /* When encoding, we use 64 chars/line, which equals 48 real chars. */
1009 return (datalen
+ 47) / 48;
1012 void base64_encode(FILE * fp
, unsigned char *data
, int datalen
, int cpl
)
1018 while (datalen
> 0) {
1019 n
= (datalen
< 3 ? datalen
: 3);
1020 base64_encode_atom(data
, n
, out
);
1023 for (i
= 0; i
< 4; i
++) {
1024 if (linelen
>= cpl
) {
1035 int ssh2_save_userkey(const Filename
*filename
, struct ssh2_userkey
*key
,
1039 unsigned char *pub_blob
, *priv_blob
, *priv_blob_encrypted
;
1040 int pub_blob_len
, priv_blob_len
, priv_encrypted_len
;
1045 unsigned char priv_mac
[20];
1048 * Fetch the key component blobs.
1050 pub_blob
= key
->alg
->public_blob(key
->data
, &pub_blob_len
);
1051 priv_blob
= key
->alg
->private_blob(key
->data
, &priv_blob_len
);
1052 if (!pub_blob
|| !priv_blob
) {
1059 * Determine encryption details, and encrypt the private blob.
1062 cipherstr
= "aes256-cbc";
1068 priv_encrypted_len
= priv_blob_len
+ cipherblk
- 1;
1069 priv_encrypted_len
-= priv_encrypted_len
% cipherblk
;
1070 priv_blob_encrypted
= snewn(priv_encrypted_len
, unsigned char);
1071 memset(priv_blob_encrypted
, 0, priv_encrypted_len
);
1072 memcpy(priv_blob_encrypted
, priv_blob
, priv_blob_len
);
1073 /* Create padding based on the SHA hash of the unpadded blob. This prevents
1074 * too easy a known-plaintext attack on the last block. */
1075 SHA_Simple(priv_blob
, priv_blob_len
, priv_mac
);
1076 assert(priv_encrypted_len
- priv_blob_len
< 20);
1077 memcpy(priv_blob_encrypted
+ priv_blob_len
, priv_mac
,
1078 priv_encrypted_len
- priv_blob_len
);
1080 /* Now create the MAC. */
1082 unsigned char *macdata
;
1085 int namelen
= strlen(key
->alg
->name
);
1086 int enclen
= strlen(cipherstr
);
1087 int commlen
= strlen(key
->comment
);
1089 unsigned char mackey
[20];
1090 char header
[] = "putty-private-key-file-mac-key";
1092 maclen
= (4 + namelen
+
1096 4 + priv_encrypted_len
);
1097 macdata
= snewn(maclen
, unsigned char);
1099 #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len)
1100 DO_STR(key
->alg
->name
, namelen
);
1101 DO_STR(cipherstr
, enclen
);
1102 DO_STR(key
->comment
, commlen
);
1103 DO_STR(pub_blob
, pub_blob_len
);
1104 DO_STR(priv_blob_encrypted
, priv_encrypted_len
);
1107 SHA_Bytes(&s
, header
, sizeof(header
)-1);
1109 SHA_Bytes(&s
, passphrase
, strlen(passphrase
));
1110 SHA_Final(&s
, mackey
);
1111 hmac_sha1_simple(mackey
, 20, macdata
, maclen
, priv_mac
);
1112 memset(macdata
, 0, maclen
);
1114 memset(mackey
, 0, sizeof(mackey
));
1115 memset(&s
, 0, sizeof(s
));
1119 unsigned char key
[40];
1122 passlen
= strlen(passphrase
);
1125 SHA_Bytes(&s
, "\0\0\0\0", 4);
1126 SHA_Bytes(&s
, passphrase
, passlen
);
1127 SHA_Final(&s
, key
+ 0);
1129 SHA_Bytes(&s
, "\0\0\0\1", 4);
1130 SHA_Bytes(&s
, passphrase
, passlen
);
1131 SHA_Final(&s
, key
+ 20);
1132 aes256_encrypt_pubkey(key
, priv_blob_encrypted
,
1133 priv_encrypted_len
);
1135 memset(key
, 0, sizeof(key
));
1136 memset(&s
, 0, sizeof(s
));
1139 fp
= f_open(*filename
, "w");
1142 fprintf(fp
, "PuTTY-User-Key-File-2: %s\n", key
->alg
->name
);
1143 fprintf(fp
, "Encryption: %s\n", cipherstr
);
1144 fprintf(fp
, "Comment: %s\n", key
->comment
);
1145 fprintf(fp
, "Public-Lines: %d\n", base64_lines(pub_blob_len
));
1146 base64_encode(fp
, pub_blob
, pub_blob_len
, 64);
1147 fprintf(fp
, "Private-Lines: %d\n", base64_lines(priv_encrypted_len
));
1148 base64_encode(fp
, priv_blob_encrypted
, priv_encrypted_len
, 64);
1149 fprintf(fp
, "Private-MAC: ");
1150 for (i
= 0; i
< 20; i
++)
1151 fprintf(fp
, "%02x", priv_mac
[i
]);
1156 memset(priv_blob
, 0, priv_blob_len
);
1158 sfree(priv_blob_encrypted
);
1162 /* ----------------------------------------------------------------------
1163 * A function to determine the type of a private key file. Returns
1164 * 0 on failure, 1 or 2 on success.
1166 int key_type(const Filename
*filename
)
1170 const char putty2_sig
[] = "PuTTY-User-Key-File-";
1171 const char sshcom_sig
[] = "---- BEGIN SSH2 ENCRYPTED PRIVAT";
1172 const char openssh_sig
[] = "-----BEGIN ";
1175 fp
= f_open(*filename
, "r");
1177 return SSH_KEYTYPE_UNOPENABLE
;
1178 i
= fread(buf
, 1, sizeof(buf
), fp
);
1181 return SSH_KEYTYPE_UNOPENABLE
;
1183 return SSH_KEYTYPE_UNKNOWN
;
1184 if (!memcmp(buf
, rsa_signature
, sizeof(rsa_signature
)-1))
1185 return SSH_KEYTYPE_SSH1
;
1186 if (!memcmp(buf
, putty2_sig
, sizeof(putty2_sig
)-1))
1187 return SSH_KEYTYPE_SSH2
;
1188 if (!memcmp(buf
, openssh_sig
, sizeof(openssh_sig
)-1))
1189 return SSH_KEYTYPE_OPENSSH
;
1190 if (!memcmp(buf
, sshcom_sig
, sizeof(sshcom_sig
)-1))
1191 return SSH_KEYTYPE_SSHCOM
;
1192 return SSH_KEYTYPE_UNKNOWN
; /* unrecognised or EOF */
1196 * Convert the type word to a string, for `wrong type' error
1199 char *key_type_to_str(int type
)
1202 case SSH_KEYTYPE_UNOPENABLE
: return "unable to open file"; break;
1203 case SSH_KEYTYPE_UNKNOWN
: return "not a private key"; break;
1204 case SSH_KEYTYPE_SSH1
: return "SSH-1 private key"; break;
1205 case SSH_KEYTYPE_SSH2
: return "PuTTY SSH-2 private key"; break;
1206 case SSH_KEYTYPE_OPENSSH
: return "OpenSSH SSH-2 private key"; break;
1207 case SSH_KEYTYPE_SSHCOM
: return "ssh.com SSH-2 private key"; break;
1208 default: return "INTERNAL ERROR"; break;