2 * Code for PuTTY to import and export private key files in other
3 * SSH clients' formats.
15 int openssh_encrypted(const Filename
*filename
);
16 struct ssh2_userkey
*openssh_read(const Filename
*filename
, char *passphrase
,
17 const char **errmsg_p
);
18 int openssh_write(const Filename
*filename
, struct ssh2_userkey
*key
,
21 int sshcom_encrypted(const Filename
*filename
, char **comment
);
22 struct ssh2_userkey
*sshcom_read(const Filename
*filename
, char *passphrase
,
23 const char **errmsg_p
);
24 int sshcom_write(const Filename
*filename
, struct ssh2_userkey
*key
,
28 * Given a key type, determine whether we know how to import it.
30 int import_possible(int type
)
32 if (type
== SSH_KEYTYPE_OPENSSH
)
34 if (type
== SSH_KEYTYPE_SSHCOM
)
40 * Given a key type, determine what native key type
41 * (SSH_KEYTYPE_SSH1 or SSH_KEYTYPE_SSH2) it will come out as once
44 int import_target_type(int type
)
47 * There are no known foreign SSH-1 key formats.
49 return SSH_KEYTYPE_SSH2
;
53 * Determine whether a foreign key is encrypted.
55 int import_encrypted(const Filename
*filename
, int type
, char **comment
)
57 if (type
== SSH_KEYTYPE_OPENSSH
) {
58 /* OpenSSH doesn't do key comments */
59 *comment
= dupstr(filename_to_str(filename
));
60 return openssh_encrypted(filename
);
62 if (type
== SSH_KEYTYPE_SSHCOM
) {
63 return sshcom_encrypted(filename
, comment
);
69 * Import an SSH-1 key.
71 int import_ssh1(const Filename
*filename
, int type
,
72 struct RSAKey
*key
, char *passphrase
, const char **errmsg_p
)
78 * Import an SSH-2 key.
80 struct ssh2_userkey
*import_ssh2(const Filename
*filename
, int type
,
81 char *passphrase
, const char **errmsg_p
)
83 if (type
== SSH_KEYTYPE_OPENSSH
)
84 return openssh_read(filename
, passphrase
, errmsg_p
);
85 if (type
== SSH_KEYTYPE_SSHCOM
)
86 return sshcom_read(filename
, passphrase
, errmsg_p
);
91 * Export an SSH-1 key.
93 int export_ssh1(const Filename
*filename
, int type
, struct RSAKey
*key
,
100 * Export an SSH-2 key.
102 int export_ssh2(const Filename
*filename
, int type
,
103 struct ssh2_userkey
*key
, char *passphrase
)
105 if (type
== SSH_KEYTYPE_OPENSSH
)
106 return openssh_write(filename
, key
, passphrase
);
107 if (type
== SSH_KEYTYPE_SSHCOM
)
108 return sshcom_write(filename
, key
, passphrase
);
113 * Strip trailing CRs and LFs at the end of a line of text.
115 void strip_crlf(char *str
)
117 char *p
= str
+ strlen(str
);
119 while (p
> str
&& (p
[-1] == '\r' || p
[-1] == '\n'))
123 /* ----------------------------------------------------------------------
124 * Helper routines. (The base64 ones are defined in sshpubk.c.)
127 #define isbase64(c) ( ((c) >= 'A' && (c) <= 'Z') || \
128 ((c) >= 'a' && (c) <= 'z') || \
129 ((c) >= '0' && (c) <= '9') || \
130 (c) == '+' || (c) == '/' || (c) == '=' \
134 * Read an ASN.1/BER identifier and length pair.
136 * Flags are a combination of the #defines listed below.
138 * Returns -1 if unsuccessful; otherwise returns the number of
139 * bytes used out of the source data.
142 /* ASN.1 tag classes. */
143 #define ASN1_CLASS_UNIVERSAL (0 << 6)
144 #define ASN1_CLASS_APPLICATION (1 << 6)
145 #define ASN1_CLASS_CONTEXT_SPECIFIC (2 << 6)
146 #define ASN1_CLASS_PRIVATE (3 << 6)
147 #define ASN1_CLASS_MASK (3 << 6)
149 /* Primitive versus constructed bit. */
150 #define ASN1_CONSTRUCTED (1 << 5)
152 static int ber_read_id_len(void *source
, int sourcelen
,
153 int *id
, int *length
, int *flags
)
155 unsigned char *p
= (unsigned char *) source
;
160 *flags
= (*p
& 0xE0);
161 if ((*p
& 0x1F) == 0x1F) {
167 *id
= (*id
<< 7) | (*p
& 0x7F);
185 *length
= (*length
<< 8) | (*p
++);
192 return p
- (unsigned char *) source
;
196 * Write an ASN.1/BER identifier and length pair. Returns the
197 * number of bytes consumed. Assumes dest contains enough space.
198 * Will avoid writing anything if dest is NULL, but still return
199 * amount of space required.
201 static int ber_write_id_len(void *dest
, int id
, int length
, int flags
)
203 unsigned char *d
= (unsigned char *)dest
;
208 * Identifier is one byte.
211 if (d
) *d
++ = id
| flags
;
215 * Identifier is multiple bytes: the first byte is 11111
216 * plus the flags, and subsequent bytes encode the value of
217 * the identifier, 7 bits at a time, with the top bit of
218 * each byte 1 except the last one which is 0.
221 if (d
) *d
++ = 0x1F | flags
;
222 for (n
= 1; (id
>> (7*n
)) > 0; n
++)
223 continue; /* count the bytes */
226 if (d
) *d
++ = (n ?
0x80 : 0) | ((id
>> (7*n
)) & 0x7F);
232 * Length is one byte.
235 if (d
) *d
++ = length
;
239 * Length is multiple bytes. The first is 0x80 plus the
240 * number of subsequent bytes, and the subsequent bytes
241 * encode the actual length.
243 for (n
= 1; (length
>> (8*n
)) > 0; n
++)
244 continue; /* count the bytes */
246 if (d
) *d
++ = 0x80 | n
;
249 if (d
) *d
++ = (length
>> (8*n
)) & 0xFF;
256 static int put_string(void *target
, void *data
, int len
)
258 unsigned char *d
= (unsigned char *)target
;
261 memcpy(d
+4, data
, len
);
265 static int put_mp(void *target
, void *data
, int len
)
267 unsigned char *d
= (unsigned char *)target
;
268 unsigned char *i
= (unsigned char *)data
;
273 memcpy(d
+5, data
, len
);
277 memcpy(d
+4, data
, len
);
282 /* Simple structure to point to an mp-int within a blob. */
283 struct mpint_pos
{ void *start
; int bytes
; };
285 static int ssh2_read_mpint(void *data
, int len
, struct mpint_pos
*ret
)
288 unsigned char *d
= (unsigned char *) data
;
292 bytes
= toint(GET_32BIT(d
));
293 if (bytes
< 0 || len
-4 < bytes
)
303 return len
; /* ensure further calls fail as well */
306 /* ----------------------------------------------------------------------
307 * Code to read and write OpenSSH private keys.
310 enum { OSSH_DSA
, OSSH_RSA
};
311 enum { OSSH_ENC_3DES
, OSSH_ENC_AES
};
314 int encrypted
, encryption
;
316 unsigned char *keyblob
;
317 int keyblob_len
, keyblob_size
;
320 static struct openssh_key
*load_openssh_key(const Filename
*filename
,
321 const char **errmsg_p
)
323 struct openssh_key
*ret
;
329 int base64_chars
= 0;
331 ret
= snew(struct openssh_key
);
333 ret
->keyblob_len
= ret
->keyblob_size
= 0;
335 memset(ret
->iv
, 0, sizeof(ret
->iv
));
337 fp
= f_open(filename
, "r", FALSE
);
339 errmsg
= "unable to open key file";
343 if (!(line
= fgetline(fp
))) {
344 errmsg
= "unexpected end of file";
348 if (0 != strncmp(line
, "-----BEGIN ", 11) ||
349 0 != strcmp(line
+strlen(line
)-16, "PRIVATE KEY-----")) {
350 errmsg
= "file does not begin with OpenSSH key header";
353 if (!strcmp(line
, "-----BEGIN RSA PRIVATE KEY-----"))
354 ret
->type
= OSSH_RSA
;
355 else if (!strcmp(line
, "-----BEGIN DSA PRIVATE KEY-----"))
356 ret
->type
= OSSH_DSA
;
358 errmsg
= "unrecognised key type";
361 smemclr(line
, strlen(line
));
367 if (!(line
= fgetline(fp
))) {
368 errmsg
= "unexpected end of file";
372 if (0 == strncmp(line
, "-----END ", 9) &&
373 0 == strcmp(line
+strlen(line
)-16, "PRIVATE KEY-----")) {
377 if ((p
= strchr(line
, ':')) != NULL
) {
379 errmsg
= "header found in body of key data";
383 while (*p
&& isspace((unsigned char)*p
)) p
++;
384 if (!strcmp(line
, "Proc-Type")) {
385 if (p
[0] != '4' || p
[1] != ',') {
386 errmsg
= "Proc-Type is not 4 (only 4 is supported)";
390 if (!strcmp(p
, "ENCRYPTED"))
392 } else if (!strcmp(line
, "DEK-Info")) {
395 if (!strncmp(p
, "DES-EDE3-CBC,", 13)) {
396 ret
->encryption
= OSSH_ENC_3DES
;
398 } else if (!strncmp(p
, "AES-128-CBC,", 12)) {
399 ret
->encryption
= OSSH_ENC_AES
;
402 errmsg
= "unsupported cipher";
405 p
= strchr(p
, ',') + 1;/* always non-NULL, by above checks */
406 for (i
= 0; i
< ivlen
; i
++) {
407 if (1 != sscanf(p
, "%2x", &j
)) {
408 errmsg
= "expected more iv data in DEK-Info";
415 errmsg
= "more iv data than expected in DEK-Info";
423 while (isbase64(*p
)) {
424 base64_bit
[base64_chars
++] = *p
;
425 if (base64_chars
== 4) {
426 unsigned char out
[3];
431 len
= base64_decode_atom(base64_bit
, out
);
434 errmsg
= "invalid base64 encoding";
438 if (ret
->keyblob_len
+ len
> ret
->keyblob_size
) {
439 ret
->keyblob_size
= ret
->keyblob_len
+ len
+ 256;
440 ret
->keyblob
= sresize(ret
->keyblob
, ret
->keyblob_size
,
444 memcpy(ret
->keyblob
+ ret
->keyblob_len
, out
, len
);
445 ret
->keyblob_len
+= len
;
447 smemclr(out
, sizeof(out
));
453 smemclr(line
, strlen(line
));
461 if (ret
->keyblob_len
== 0 || !ret
->keyblob
) {
462 errmsg
= "key body not present";
466 if (ret
->encrypted
&& ret
->keyblob_len
% 8 != 0) {
467 errmsg
= "encrypted key blob is not a multiple of cipher block size";
471 smemclr(base64_bit
, sizeof(base64_bit
));
472 if (errmsg_p
) *errmsg_p
= NULL
;
477 smemclr(line
, strlen(line
));
481 smemclr(base64_bit
, sizeof(base64_bit
));
484 smemclr(ret
->keyblob
, ret
->keyblob_size
);
487 smemclr(ret
, sizeof(*ret
));
490 if (errmsg_p
) *errmsg_p
= errmsg
;
495 int openssh_encrypted(const Filename
*filename
)
497 struct openssh_key
*key
= load_openssh_key(filename
, NULL
);
502 ret
= key
->encrypted
;
503 smemclr(key
->keyblob
, key
->keyblob_size
);
505 smemclr(key
, sizeof(*key
));
510 struct ssh2_userkey
*openssh_read(const Filename
*filename
, char *passphrase
,
511 const char **errmsg_p
)
513 struct openssh_key
*key
= load_openssh_key(filename
, errmsg_p
);
514 struct ssh2_userkey
*retkey
;
516 int ret
, id
, len
, flags
;
518 struct ssh2_userkey
*retval
= NULL
;
521 int blobsize
= 0, blobptr
, privptr
;
530 if (key
->encrypted
) {
532 * Derive encryption key from passphrase and iv/salt:
534 * - let block A equal MD5(passphrase || iv)
535 * - let block B equal MD5(A || passphrase || iv)
536 * - block C would be MD5(B || passphrase || iv) and so on
537 * - encryption key is the first N bytes of A || B
539 * (Note that only 8 bytes of the iv are used for key
540 * derivation, even when the key is encrypted with AES and
541 * hence there are 16 bytes available.)
543 struct MD5Context md5c
;
544 unsigned char keybuf
[32];
547 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
548 MD5Update(&md5c
, (unsigned char *)key
->iv
, 8);
549 MD5Final(keybuf
, &md5c
);
552 MD5Update(&md5c
, keybuf
, 16);
553 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
554 MD5Update(&md5c
, (unsigned char *)key
->iv
, 8);
555 MD5Final(keybuf
+16, &md5c
);
558 * Now decrypt the key blob.
560 if (key
->encryption
== OSSH_ENC_3DES
)
561 des3_decrypt_pubkey_ossh(keybuf
, (unsigned char *)key
->iv
,
562 key
->keyblob
, key
->keyblob_len
);
565 assert(key
->encryption
== OSSH_ENC_AES
);
566 ctx
= aes_make_context();
567 aes128_key(ctx
, keybuf
);
568 aes_iv(ctx
, (unsigned char *)key
->iv
);
569 aes_ssh2_decrypt_blk(ctx
, key
->keyblob
, key
->keyblob_len
);
570 aes_free_context(ctx
);
573 smemclr(&md5c
, sizeof(md5c
));
574 smemclr(keybuf
, sizeof(keybuf
));
578 * Now we have a decrypted key blob, which contains an ASN.1
579 * encoded private key. We must now untangle the ASN.1.
581 * We expect the whole key blob to be formatted as a SEQUENCE
582 * (0x30 followed by a length code indicating that the rest of
583 * the blob is part of the sequence). Within that SEQUENCE we
584 * expect to see a bunch of INTEGERs. What those integers mean
585 * depends on the key type:
587 * - For RSA, we expect the integers to be 0, n, e, d, p, q,
588 * dmp1, dmq1, iqmp in that order. (The last three are d mod
589 * (p-1), d mod (q-1), inverse of q mod p respectively.)
591 * - For DSA, we expect them to be 0, p, q, g, y, x in that
597 /* Expect the SEQUENCE header. Take its absence as a failure to
598 * decrypt, if the key was encrypted. */
599 ret
= ber_read_id_len(p
, key
->keyblob_len
, &id
, &len
, &flags
);
601 if (ret
< 0 || id
!= 16) {
602 errmsg
= "ASN.1 decoding failure";
603 retval
= key
->encrypted ? SSH2_WRONG_PASSPHRASE
: NULL
;
607 /* Expect a load of INTEGERs. */
608 if (key
->type
== OSSH_RSA
)
610 else if (key
->type
== OSSH_DSA
)
613 num_integers
= 0; /* placate compiler warnings */
616 * Space to create key blob in.
618 blobsize
= 256+key
->keyblob_len
;
619 blob
= snewn(blobsize
, unsigned char);
621 if (key
->type
== OSSH_DSA
)
622 memcpy(blob
+4, "ssh-dss", 7);
623 else if (key
->type
== OSSH_RSA
)
624 memcpy(blob
+4, "ssh-rsa", 7);
628 for (i
= 0; i
< num_integers
; i
++) {
629 ret
= ber_read_id_len(p
, key
->keyblob
+key
->keyblob_len
-p
,
632 if (ret
< 0 || id
!= 2 ||
633 key
->keyblob
+key
->keyblob_len
-p
< len
) {
634 errmsg
= "ASN.1 decoding failure";
635 retval
= key
->encrypted ? SSH2_WRONG_PASSPHRASE
: NULL
;
641 * The first integer should be zero always (I think
642 * this is some sort of version indication).
644 if (len
!= 1 || p
[0] != 0) {
645 errmsg
= "version number mismatch";
648 } else if (key
->type
== OSSH_RSA
) {
650 * Integers 1 and 2 go into the public blob but in the
651 * opposite order; integers 3, 4, 5 and 8 go into the
652 * private blob. The other two (6 and 7) are ignored.
655 /* Save the details for after we deal with number 2. */
658 } else if (i
!= 6 && i
!= 7) {
659 PUT_32BIT(blob
+blobptr
, len
);
660 memcpy(blob
+blobptr
+4, p
, len
);
663 PUT_32BIT(blob
+blobptr
, modlen
);
664 memcpy(blob
+blobptr
+4, modptr
, modlen
);
669 } else if (key
->type
== OSSH_DSA
) {
671 * Integers 1-4 go into the public blob; integer 5 goes
672 * into the private blob.
674 PUT_32BIT(blob
+blobptr
, len
);
675 memcpy(blob
+blobptr
+4, p
, len
);
681 /* Skip past the number. */
686 * Now put together the actual key. Simplest way to do this is
687 * to assemble our own key blobs and feed them to the createkey
688 * functions; this is a bit faffy but it does mean we get all
689 * the sanity checks for free.
691 assert(privptr
> 0); /* should have bombed by now if not */
692 retkey
= snew(struct ssh2_userkey
);
693 retkey
->alg
= (key
->type
== OSSH_RSA ?
&ssh_rsa
: &ssh_dss
);
694 retkey
->data
= retkey
->alg
->createkey(blob
, privptr
,
695 blob
+privptr
, blobptr
-privptr
);
698 errmsg
= "unable to create key data structure";
702 retkey
->comment
= dupstr("imported-openssh-key");
703 errmsg
= NULL
; /* no error */
708 smemclr(blob
, blobsize
);
711 smemclr(key
->keyblob
, key
->keyblob_size
);
713 smemclr(key
, sizeof(*key
));
715 if (errmsg_p
) *errmsg_p
= errmsg
;
719 int openssh_write(const Filename
*filename
, struct ssh2_userkey
*key
,
722 unsigned char *pubblob
, *privblob
, *spareblob
;
723 int publen
, privlen
, sparelen
= 0;
724 unsigned char *outblob
;
726 struct mpint_pos numbers
[9];
727 int nnumbers
, pos
, len
, seqlen
, i
;
728 char *header
, *footer
;
735 * Fetch the key blobs.
737 pubblob
= key
->alg
->public_blob(key
->data
, &publen
);
738 privblob
= key
->alg
->private_blob(key
->data
, &privlen
);
739 spareblob
= outblob
= NULL
;
742 * Find the sequence of integers to be encoded into the OpenSSH
743 * key blob, and also decide on the header line.
745 if (key
->alg
== &ssh_rsa
) {
747 struct mpint_pos n
, e
, d
, p
, q
, iqmp
, dmp1
, dmq1
;
748 Bignum bd
, bp
, bq
, bdmp1
, bdmq1
;
751 * These blobs were generated from inside PuTTY, so we needn't
752 * treat them as untrusted.
754 pos
= 4 + GET_32BIT(pubblob
);
755 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &e
);
756 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &n
);
758 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &d
);
759 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &p
);
760 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &q
);
761 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &iqmp
);
763 assert(e
.start
&& iqmp
.start
); /* can't go wrong */
765 /* We also need d mod (p-1) and d mod (q-1). */
766 bd
= bignum_from_bytes(d
.start
, d
.bytes
);
767 bp
= bignum_from_bytes(p
.start
, p
.bytes
);
768 bq
= bignum_from_bytes(q
.start
, q
.bytes
);
771 bdmp1
= bigmod(bd
, bp
);
772 bdmq1
= bigmod(bd
, bq
);
777 dmp1
.bytes
= (bignum_bitcount(bdmp1
)+8)/8;
778 dmq1
.bytes
= (bignum_bitcount(bdmq1
)+8)/8;
779 sparelen
= dmp1
.bytes
+ dmq1
.bytes
;
780 spareblob
= snewn(sparelen
, unsigned char);
781 dmp1
.start
= spareblob
;
782 dmq1
.start
= spareblob
+ dmp1
.bytes
;
783 for (i
= 0; i
< dmp1
.bytes
; i
++)
784 spareblob
[i
] = bignum_byte(bdmp1
, dmp1
.bytes
-1 - i
);
785 for (i
= 0; i
< dmq1
.bytes
; i
++)
786 spareblob
[i
+dmp1
.bytes
] = bignum_byte(bdmq1
, dmq1
.bytes
-1 - i
);
790 numbers
[0].start
= zero
; numbers
[0].bytes
= 1; zero
[0] = '\0';
801 header
= "-----BEGIN RSA PRIVATE KEY-----\n";
802 footer
= "-----END RSA PRIVATE KEY-----\n";
803 } else if (key
->alg
== &ssh_dss
) {
805 struct mpint_pos p
, q
, g
, y
, x
;
808 * These blobs were generated from inside PuTTY, so we needn't
809 * treat them as untrusted.
811 pos
= 4 + GET_32BIT(pubblob
);
812 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &p
);
813 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &q
);
814 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &g
);
815 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &y
);
817 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &x
);
819 assert(y
.start
&& x
.start
); /* can't go wrong */
821 numbers
[0].start
= zero
; numbers
[0].bytes
= 1; zero
[0] = '\0';
829 header
= "-----BEGIN DSA PRIVATE KEY-----\n";
830 footer
= "-----END DSA PRIVATE KEY-----\n";
832 assert(0); /* zoinks! */
833 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
837 * Now count up the total size of the ASN.1 encoded integers,
838 * so as to determine the length of the containing SEQUENCE.
841 for (i
= 0; i
< nnumbers
; i
++) {
842 len
+= ber_write_id_len(NULL
, 2, numbers
[i
].bytes
, 0);
843 len
+= numbers
[i
].bytes
;
846 /* Now add on the SEQUENCE header. */
847 len
+= ber_write_id_len(NULL
, 16, seqlen
, ASN1_CONSTRUCTED
);
848 /* Round up to the cipher block size, ensuring we have at least one
849 * byte of padding (see below). */
852 outlen
= (outlen
+8) &~ 7;
855 * Now we know how big outblob needs to be. Allocate it.
857 outblob
= snewn(outlen
, unsigned char);
860 * And write the data into it.
863 pos
+= ber_write_id_len(outblob
+pos
, 16, seqlen
, ASN1_CONSTRUCTED
);
864 for (i
= 0; i
< nnumbers
; i
++) {
865 pos
+= ber_write_id_len(outblob
+pos
, 2, numbers
[i
].bytes
, 0);
866 memcpy(outblob
+pos
, numbers
[i
].start
, numbers
[i
].bytes
);
867 pos
+= numbers
[i
].bytes
;
871 * Padding on OpenSSH keys is deterministic. The number of
872 * padding bytes is always more than zero, and always at most
873 * the cipher block length. The value of each padding byte is
874 * equal to the number of padding bytes. So a plaintext that's
875 * an exact multiple of the block size will be padded with 08
876 * 08 08 08 08 08 08 08 (assuming a 64-bit block cipher); a
877 * plaintext one byte less than a multiple of the block size
878 * will be padded with just 01.
880 * This enables the OpenSSL key decryption function to strip
881 * off the padding algorithmically and return the unpadded
882 * plaintext to the next layer: it looks at the final byte, and
883 * then expects to find that many bytes at the end of the data
884 * with the same value. Those are all removed and the rest is
888 while (pos
< outlen
) {
889 outblob
[pos
++] = outlen
- len
;
895 * For the moment, we still encrypt our OpenSSH keys using
900 * Invent an iv. Then derive encryption key from passphrase
903 * - let block A equal MD5(passphrase || iv)
904 * - let block B equal MD5(A || passphrase || iv)
905 * - block C would be MD5(B || passphrase || iv) and so on
906 * - encryption key is the first N bytes of A || B
908 struct MD5Context md5c
;
909 unsigned char keybuf
[32];
911 for (i
= 0; i
< 8; i
++) iv
[i
] = random_byte();
914 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
915 MD5Update(&md5c
, iv
, 8);
916 MD5Final(keybuf
, &md5c
);
919 MD5Update(&md5c
, keybuf
, 16);
920 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
921 MD5Update(&md5c
, iv
, 8);
922 MD5Final(keybuf
+16, &md5c
);
925 * Now encrypt the key blob.
927 des3_encrypt_pubkey_ossh(keybuf
, iv
, outblob
, outlen
);
929 smemclr(&md5c
, sizeof(md5c
));
930 smemclr(keybuf
, sizeof(keybuf
));
934 * And save it. We'll use Unix line endings just in case it's
935 * subsequently transferred in binary mode.
937 fp
= f_open(filename
, "wb", TRUE
); /* ensure Unix line endings */
942 fprintf(fp
, "Proc-Type: 4,ENCRYPTED\nDEK-Info: DES-EDE3-CBC,");
943 for (i
= 0; i
< 8; i
++)
944 fprintf(fp
, "%02X", iv
[i
]);
947 base64_encode(fp
, outblob
, outlen
, 64);
954 smemclr(outblob
, outlen
);
958 smemclr(spareblob
, sparelen
);
962 smemclr(privblob
, privlen
);
966 smemclr(pubblob
, publen
);
972 /* ----------------------------------------------------------------------
973 * Code to read ssh.com private keys.
977 * The format of the base64 blob is largely SSH-2-packet-formatted,
978 * except that mpints are a bit different: they're more like the
979 * old SSH-1 mpint. You have a 32-bit bit count N, followed by
980 * (N+7)/8 bytes of data.
982 * So. The blob contains:
984 * - uint32 0x3f6ff9eb (magic number)
985 * - uint32 size (total blob size)
986 * - string key-type (see below)
987 * - string cipher-type (tells you if key is encrypted)
988 * - string encrypted-blob
990 * (The first size field includes the size field itself and the
991 * magic number before it. All other size fields are ordinary SSH-2
992 * strings, so the size field indicates how much data is to
995 * The encrypted blob, once decrypted, contains a single string
996 * which in turn contains the payload. (This allows padding to be
997 * added after that string while still making it clear where the
998 * real payload ends. Also it probably makes for a reasonable
1001 * The payload blob, for an RSA key, contains:
1004 * - mpint n (yes, the public and private stuff is intermixed)
1005 * - mpint u (presumably inverse of p mod q)
1006 * - mpint p (p is the smaller prime)
1007 * - mpint q (q is the larger)
1009 * For a DSA key, the payload blob contains:
1017 * Alternatively, if the parameters are `predefined', that
1018 * (0,p,g,q) sequence can be replaced by a uint32 1 and a string
1019 * containing some predefined parameter specification. *shudder*,
1020 * but I doubt we'll encounter this in real life.
1022 * The key type strings are ghastly. The RSA key I looked at had a
1025 * `if-modn{sign{rsa-pkcs1-sha1},encrypt{rsa-pkcs1v2-oaep}}'
1027 * and the DSA key wasn't much better:
1029 * `dl-modp{sign{dsa-nist-sha1},dh{plain}}'
1031 * It isn't clear that these will always be the same. I think it
1032 * might be wise just to look at the `if-modn{sign{rsa' and
1033 * `dl-modp{sign{dsa' prefixes.
1035 * Finally, the encryption. The cipher-type string appears to be
1036 * either `none' or `3des-cbc'. Looks as if this is SSH-2-style
1037 * 3des-cbc (i.e. outer cbc rather than inner). The key is created
1038 * from the passphrase by means of yet another hashing faff:
1040 * - first 16 bytes are MD5(passphrase)
1041 * - next 16 bytes are MD5(passphrase || first 16 bytes)
1042 * - if there were more, they'd be MD5(passphrase || first 32),
1046 #define SSHCOM_MAGIC_NUMBER 0x3f6ff9eb
1049 char comment
[256]; /* allowing any length is overkill */
1050 unsigned char *keyblob
;
1051 int keyblob_len
, keyblob_size
;
1054 static struct sshcom_key
*load_sshcom_key(const Filename
*filename
,
1055 const char **errmsg_p
)
1057 struct sshcom_key
*ret
;
1064 int base64_chars
= 0;
1066 ret
= snew(struct sshcom_key
);
1067 ret
->comment
[0] = '\0';
1068 ret
->keyblob
= NULL
;
1069 ret
->keyblob_len
= ret
->keyblob_size
= 0;
1071 fp
= f_open(filename
, "r", FALSE
);
1073 errmsg
= "unable to open key file";
1076 if (!(line
= fgetline(fp
))) {
1077 errmsg
= "unexpected end of file";
1081 if (0 != strcmp(line
, "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----")) {
1082 errmsg
= "file does not begin with ssh.com key header";
1085 smemclr(line
, strlen(line
));
1091 if (!(line
= fgetline(fp
))) {
1092 errmsg
= "unexpected end of file";
1096 if (!strcmp(line
, "---- END SSH2 ENCRYPTED PRIVATE KEY ----")) {
1100 if ((p
= strchr(line
, ':')) != NULL
) {
1102 errmsg
= "header found in body of key data";
1106 while (*p
&& isspace((unsigned char)*p
)) p
++;
1107 hdrstart
= p
- line
;
1110 * Header lines can end in a trailing backslash for
1113 len
= hdrstart
+ strlen(line
+hdrstart
);
1115 while (line
[len
-1] == '\\') {
1119 line2
= fgetline(fp
);
1121 errmsg
= "unexpected end of file";
1126 line2len
= strlen(line2
);
1127 line
= sresize(line
, len
+ line2len
+ 1, char);
1128 strcpy(line
+ len
- 1, line2
);
1129 len
+= line2len
- 1;
1132 smemclr(line2
, strlen(line2
));
1136 p
= line
+ hdrstart
;
1138 if (!strcmp(line
, "Comment")) {
1139 /* Strip quotes in comment if present. */
1140 if (p
[0] == '"' && p
[strlen(p
)-1] == '"') {
1142 p
[strlen(p
)-1] = '\0';
1144 strncpy(ret
->comment
, p
, sizeof(ret
->comment
));
1145 ret
->comment
[sizeof(ret
->comment
)-1] = '\0';
1151 while (isbase64(*p
)) {
1152 base64_bit
[base64_chars
++] = *p
;
1153 if (base64_chars
== 4) {
1154 unsigned char out
[3];
1158 len
= base64_decode_atom(base64_bit
, out
);
1161 errmsg
= "invalid base64 encoding";
1165 if (ret
->keyblob_len
+ len
> ret
->keyblob_size
) {
1166 ret
->keyblob_size
= ret
->keyblob_len
+ len
+ 256;
1167 ret
->keyblob
= sresize(ret
->keyblob
, ret
->keyblob_size
,
1171 memcpy(ret
->keyblob
+ ret
->keyblob_len
, out
, len
);
1172 ret
->keyblob_len
+= len
;
1178 smemclr(line
, strlen(line
));
1183 if (ret
->keyblob_len
== 0 || !ret
->keyblob
) {
1184 errmsg
= "key body not present";
1189 if (errmsg_p
) *errmsg_p
= NULL
;
1197 smemclr(line
, strlen(line
));
1203 smemclr(ret
->keyblob
, ret
->keyblob_size
);
1204 sfree(ret
->keyblob
);
1206 smemclr(ret
, sizeof(*ret
));
1209 if (errmsg_p
) *errmsg_p
= errmsg
;
1213 int sshcom_encrypted(const Filename
*filename
, char **comment
)
1215 struct sshcom_key
*key
= load_sshcom_key(filename
, NULL
);
1216 int pos
, len
, answer
;
1225 * Check magic number.
1227 if (GET_32BIT(key
->keyblob
) != 0x3f6ff9eb) {
1228 goto done
; /* key is invalid */
1232 * Find the cipher-type string.
1235 if (key
->keyblob_len
< pos
+4)
1236 goto done
; /* key is far too short */
1237 len
= toint(GET_32BIT(key
->keyblob
+ pos
));
1238 if (len
< 0 || len
> key
->keyblob_len
- pos
- 4)
1239 goto done
; /* key is far too short */
1240 pos
+= 4 + len
; /* skip key type */
1241 len
= toint(GET_32BIT(key
->keyblob
+ pos
)); /* find cipher-type length */
1242 if (len
< 0 || len
> key
->keyblob_len
- pos
- 4)
1243 goto done
; /* cipher type string is incomplete */
1244 if (len
!= 4 || 0 != memcmp(key
->keyblob
+ pos
+ 4, "none", 4))
1248 *comment
= dupstr(key ? key
->comment
: "");
1249 smemclr(key
->keyblob
, key
->keyblob_size
);
1250 sfree(key
->keyblob
);
1251 smemclr(key
, sizeof(*key
));
1256 static int sshcom_read_mpint(void *data
, int len
, struct mpint_pos
*ret
)
1258 unsigned bits
, bytes
;
1259 unsigned char *d
= (unsigned char *) data
;
1263 bits
= GET_32BIT(d
);
1265 bytes
= (bits
+ 7) / 8;
1276 return len
; /* ensure further calls fail as well */
1279 static int sshcom_put_mpint(void *target
, void *data
, int len
)
1281 unsigned char *d
= (unsigned char *)target
;
1282 unsigned char *i
= (unsigned char *)data
;
1283 int bits
= len
* 8 - 1;
1286 if (*i
& (1 << (bits
& 7)))
1292 PUT_32BIT(d
, bits
+1);
1293 memcpy(d
+4, i
, len
);
1297 struct ssh2_userkey
*sshcom_read(const Filename
*filename
, char *passphrase
,
1298 const char **errmsg_p
)
1300 struct sshcom_key
*key
= load_sshcom_key(filename
, errmsg_p
);
1303 const char prefix_rsa
[] = "if-modn{sign{rsa";
1304 const char prefix_dsa
[] = "dl-modp{sign{dsa";
1305 enum { RSA
, DSA
} type
;
1309 struct ssh2_userkey
*ret
= NULL
, *retkey
;
1310 const struct ssh_signkey
*alg
;
1311 unsigned char *blob
= NULL
;
1312 int blobsize
= 0, publen
, privlen
;
1318 * Check magic number.
1320 if (GET_32BIT(key
->keyblob
) != SSHCOM_MAGIC_NUMBER
) {
1321 errmsg
= "key does not begin with magic number";
1326 * Determine the key type.
1329 if (key
->keyblob_len
< pos
+4 ||
1330 (len
= toint(GET_32BIT(key
->keyblob
+ pos
))) < 0 ||
1331 len
> key
->keyblob_len
- pos
- 4) {
1332 errmsg
= "key blob does not contain a key type string";
1335 if (len
> sizeof(prefix_rsa
) - 1 &&
1336 !memcmp(key
->keyblob
+pos
+4, prefix_rsa
, sizeof(prefix_rsa
) - 1)) {
1338 } else if (len
> sizeof(prefix_dsa
) - 1 &&
1339 !memcmp(key
->keyblob
+pos
+4, prefix_dsa
, sizeof(prefix_dsa
) - 1)) {
1342 errmsg
= "key is of unknown type";
1348 * Determine the cipher type.
1350 if (key
->keyblob_len
< pos
+4 ||
1351 (len
= toint(GET_32BIT(key
->keyblob
+ pos
))) < 0 ||
1352 len
> key
->keyblob_len
- pos
- 4) {
1353 errmsg
= "key blob does not contain a cipher type string";
1356 if (len
== 4 && !memcmp(key
->keyblob
+pos
+4, "none", 4))
1358 else if (len
== 8 && !memcmp(key
->keyblob
+pos
+4, "3des-cbc", 8))
1361 errmsg
= "key encryption is of unknown type";
1367 * Get hold of the encrypted part of the key.
1369 if (key
->keyblob_len
< pos
+4 ||
1370 (len
= toint(GET_32BIT(key
->keyblob
+ pos
))) < 0 ||
1371 len
> key
->keyblob_len
- pos
- 4) {
1372 errmsg
= "key blob does not contain actual key data";
1375 ciphertext
= (char *)key
->keyblob
+ pos
+ 4;
1377 if (cipherlen
== 0) {
1378 errmsg
= "length of key data is zero";
1383 * Decrypt it if necessary.
1387 * Derive encryption key from passphrase and iv/salt:
1389 * - let block A equal MD5(passphrase)
1390 * - let block B equal MD5(passphrase || A)
1391 * - block C would be MD5(passphrase || A || B) and so on
1392 * - encryption key is the first N bytes of A || B
1394 struct MD5Context md5c
;
1395 unsigned char keybuf
[32], iv
[8];
1397 if (cipherlen
% 8 != 0) {
1398 errmsg
= "encrypted part of key is not a multiple of cipher block"
1404 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
1405 MD5Final(keybuf
, &md5c
);
1408 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
1409 MD5Update(&md5c
, keybuf
, 16);
1410 MD5Final(keybuf
+16, &md5c
);
1413 * Now decrypt the key blob.
1415 memset(iv
, 0, sizeof(iv
));
1416 des3_decrypt_pubkey_ossh(keybuf
, iv
, (unsigned char *)ciphertext
,
1419 smemclr(&md5c
, sizeof(md5c
));
1420 smemclr(keybuf
, sizeof(keybuf
));
1423 * Hereafter we return WRONG_PASSPHRASE for any parsing
1424 * error. (But only if we've just tried to decrypt it!
1425 * Returning WRONG_PASSPHRASE for an unencrypted key is
1429 ret
= SSH2_WRONG_PASSPHRASE
;
1433 * Strip away the containing string to get to the real meat.
1435 len
= toint(GET_32BIT(ciphertext
));
1436 if (len
< 0 || len
> cipherlen
-4) {
1437 errmsg
= "containing string was ill-formed";
1444 * Now we break down into RSA versus DSA. In either case we'll
1445 * construct public and private blobs in our own format, and
1446 * end up feeding them to alg->createkey().
1448 blobsize
= cipherlen
+ 256;
1449 blob
= snewn(blobsize
, unsigned char);
1452 struct mpint_pos n
, e
, d
, u
, p
, q
;
1454 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &e
);
1455 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &d
);
1456 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &n
);
1457 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &u
);
1458 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &p
);
1459 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &q
);
1461 errmsg
= "key data did not contain six integers";
1467 pos
+= put_string(blob
+pos
, "ssh-rsa", 7);
1468 pos
+= put_mp(blob
+pos
, e
.start
, e
.bytes
);
1469 pos
+= put_mp(blob
+pos
, n
.start
, n
.bytes
);
1471 pos
+= put_string(blob
+pos
, d
.start
, d
.bytes
);
1472 pos
+= put_mp(blob
+pos
, q
.start
, q
.bytes
);
1473 pos
+= put_mp(blob
+pos
, p
.start
, p
.bytes
);
1474 pos
+= put_mp(blob
+pos
, u
.start
, u
.bytes
);
1475 privlen
= pos
- publen
;
1477 struct mpint_pos p
, q
, g
, x
, y
;
1480 assert(type
== DSA
); /* the only other option from the if above */
1482 if (GET_32BIT(ciphertext
) != 0) {
1483 errmsg
= "predefined DSA parameters not supported";
1486 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &p
);
1487 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &g
);
1488 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &q
);
1489 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &y
);
1490 pos
+= sshcom_read_mpint(ciphertext
+pos
, cipherlen
-pos
, &x
);
1492 errmsg
= "key data did not contain five integers";
1498 pos
+= put_string(blob
+pos
, "ssh-dss", 7);
1499 pos
+= put_mp(blob
+pos
, p
.start
, p
.bytes
);
1500 pos
+= put_mp(blob
+pos
, q
.start
, q
.bytes
);
1501 pos
+= put_mp(blob
+pos
, g
.start
, g
.bytes
);
1502 pos
+= put_mp(blob
+pos
, y
.start
, y
.bytes
);
1504 pos
+= put_mp(blob
+pos
, x
.start
, x
.bytes
);
1505 privlen
= pos
- publen
;
1508 assert(privlen
> 0); /* should have bombed by now if not */
1510 retkey
= snew(struct ssh2_userkey
);
1512 retkey
->data
= alg
->createkey(blob
, publen
, blob
+publen
, privlen
);
1513 if (!retkey
->data
) {
1515 errmsg
= "unable to create key data structure";
1518 retkey
->comment
= dupstr(key
->comment
);
1520 errmsg
= NULL
; /* no error */
1525 smemclr(blob
, blobsize
);
1528 smemclr(key
->keyblob
, key
->keyblob_size
);
1529 sfree(key
->keyblob
);
1530 smemclr(key
, sizeof(*key
));
1532 if (errmsg_p
) *errmsg_p
= errmsg
;
1536 int sshcom_write(const Filename
*filename
, struct ssh2_userkey
*key
,
1539 unsigned char *pubblob
, *privblob
;
1540 int publen
, privlen
;
1541 unsigned char *outblob
;
1543 struct mpint_pos numbers
[6];
1544 int nnumbers
, initial_zero
, pos
, lenpos
, i
;
1552 * Fetch the key blobs.
1554 pubblob
= key
->alg
->public_blob(key
->data
, &publen
);
1555 privblob
= key
->alg
->private_blob(key
->data
, &privlen
);
1559 * Find the sequence of integers to be encoded into the OpenSSH
1560 * key blob, and also decide on the header line.
1562 if (key
->alg
== &ssh_rsa
) {
1564 struct mpint_pos n
, e
, d
, p
, q
, iqmp
;
1567 * These blobs were generated from inside PuTTY, so we needn't
1568 * treat them as untrusted.
1570 pos
= 4 + GET_32BIT(pubblob
);
1571 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &e
);
1572 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &n
);
1574 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &d
);
1575 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &p
);
1576 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &q
);
1577 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &iqmp
);
1579 assert(e
.start
&& iqmp
.start
); /* can't go wrong */
1590 type
= "if-modn{sign{rsa-pkcs1-sha1},encrypt{rsa-pkcs1v2-oaep}}";
1591 } else if (key
->alg
== &ssh_dss
) {
1593 struct mpint_pos p
, q
, g
, y
, x
;
1596 * These blobs were generated from inside PuTTY, so we needn't
1597 * treat them as untrusted.
1599 pos
= 4 + GET_32BIT(pubblob
);
1600 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &p
);
1601 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &q
);
1602 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &g
);
1603 pos
+= ssh2_read_mpint(pubblob
+pos
, publen
-pos
, &y
);
1605 pos
+= ssh2_read_mpint(privblob
+pos
, privlen
-pos
, &x
);
1607 assert(y
.start
&& x
.start
); /* can't go wrong */
1617 type
= "dl-modp{sign{dsa-nist-sha1},dh{plain}}";
1619 assert(0); /* zoinks! */
1620 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
1624 * Total size of key blob will be somewhere under 512 plus
1625 * combined length of integers. We'll calculate the more
1626 * precise size as we construct the blob.
1629 for (i
= 0; i
< nnumbers
; i
++)
1630 outlen
+= 4 + numbers
[i
].bytes
;
1631 outblob
= snewn(outlen
, unsigned char);
1634 * Create the unencrypted key blob.
1637 PUT_32BIT(outblob
+pos
, SSHCOM_MAGIC_NUMBER
); pos
+= 4;
1638 pos
+= 4; /* length field, fill in later */
1639 pos
+= put_string(outblob
+pos
, type
, strlen(type
));
1641 char *ciphertype
= passphrase ?
"3des-cbc" : "none";
1642 pos
+= put_string(outblob
+pos
, ciphertype
, strlen(ciphertype
));
1644 lenpos
= pos
; /* remember this position */
1645 pos
+= 4; /* encrypted-blob size */
1646 pos
+= 4; /* encrypted-payload size */
1648 PUT_32BIT(outblob
+pos
, 0);
1651 for (i
= 0; i
< nnumbers
; i
++)
1652 pos
+= sshcom_put_mpint(outblob
+pos
,
1653 numbers
[i
].start
, numbers
[i
].bytes
);
1654 /* Now wrap up the encrypted payload. */
1655 PUT_32BIT(outblob
+lenpos
+4, pos
- (lenpos
+8));
1656 /* Pad encrypted blob to a multiple of cipher block size. */
1658 int padding
= -(pos
- (lenpos
+4)) & 7;
1660 outblob
[pos
++] = random_byte();
1662 ciphertext
= (char *)outblob
+lenpos
+4;
1663 cipherlen
= pos
- (lenpos
+4);
1664 assert(!passphrase
|| cipherlen
% 8 == 0);
1665 /* Wrap up the encrypted blob string. */
1666 PUT_32BIT(outblob
+lenpos
, cipherlen
);
1667 /* And finally fill in the total length field. */
1668 PUT_32BIT(outblob
+4, pos
);
1670 assert(pos
< outlen
);
1677 * Derive encryption key from passphrase and iv/salt:
1679 * - let block A equal MD5(passphrase)
1680 * - let block B equal MD5(passphrase || A)
1681 * - block C would be MD5(passphrase || A || B) and so on
1682 * - encryption key is the first N bytes of A || B
1684 struct MD5Context md5c
;
1685 unsigned char keybuf
[32], iv
[8];
1688 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
1689 MD5Final(keybuf
, &md5c
);
1692 MD5Update(&md5c
, (unsigned char *)passphrase
, strlen(passphrase
));
1693 MD5Update(&md5c
, keybuf
, 16);
1694 MD5Final(keybuf
+16, &md5c
);
1697 * Now decrypt the key blob.
1699 memset(iv
, 0, sizeof(iv
));
1700 des3_encrypt_pubkey_ossh(keybuf
, iv
, (unsigned char *)ciphertext
,
1703 smemclr(&md5c
, sizeof(md5c
));
1704 smemclr(keybuf
, sizeof(keybuf
));
1708 * And save it. We'll use Unix line endings just in case it's
1709 * subsequently transferred in binary mode.
1711 fp
= f_open(filename
, "wb", TRUE
); /* ensure Unix line endings */
1714 fputs("---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----\n", fp
);
1715 fprintf(fp
, "Comment: \"");
1717 * Comment header is broken with backslash-newline if it goes
1718 * over 70 chars. Although it's surrounded by quotes, it
1719 * _doesn't_ escape backslashes or quotes within the string.
1720 * Don't ask me, I didn't design it.
1723 int slen
= 60; /* starts at 60 due to "Comment: " */
1724 char *c
= key
->comment
;
1725 while ((int)strlen(c
) > slen
) {
1726 fprintf(fp
, "%.*s\\\n", slen
, c
);
1728 slen
= 70; /* allow 70 chars on subsequent lines */
1730 fprintf(fp
, "%s\"\n", c
);
1732 base64_encode(fp
, outblob
, pos
, 70);
1733 fputs("---- END SSH2 ENCRYPTED PRIVATE KEY ----\n", fp
);
1739 smemclr(outblob
, outlen
);
1743 smemclr(privblob
, privlen
);
1747 smemclr(pubblob
, publen
);