mirror of
https://github.com/clearml/dropbear
synced 2025-04-05 13:15:06 +00:00
writing out openssh ecc keys works
--HG-- branch : ecc
This commit is contained in:
Matt Johnston
parent
aafeebd0c8
commit
7fda6418e1
@ -28,6 +28,8 @@
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#include "buffer.h"
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#include "dbutil.h"
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#include "keyimport.h"
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#include "crypto_desc.h"
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#include "random.h"
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static int do_convert(int intype, const char* infile, int outtype,
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@ -114,7 +116,7 @@ static int do_convert(int intype, const char* infile, int outtype,
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const char* outfile) {
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sign_key * key = NULL;
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char * keytype = NULL;
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const char * keytype = NULL;
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int ret = 1;
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key = import_read(infile, NULL, intype);
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@ -124,16 +126,7 @@ static int do_convert(int intype, const char* infile, int outtype,
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goto out;
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}
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#ifdef DROPBEAR_RSA
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if (key->rsakey != NULL) {
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keytype = "RSA";
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}
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#endif
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#ifdef DROPBEAR_DSS
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if (key->dsskey != NULL) {
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keytype = "DSS";
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}
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#endif
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keytype = signkey_name_from_type(key->type, NULL);
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fprintf(stderr, "Key is a %s key\n", keytype);
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459
keyimport.c
459
keyimport.c
@ -2,8 +2,6 @@
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* Based on PuTTY's import.c for importing/exporting OpenSSH and SSH.com
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* keyfiles.
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*
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* The horribleness of the code is probably mine (matt).
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*
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* Modifications copyright 2003 Matt Johnston
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*
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* PuTTY is copyright 1997-2003 Simon Tatham.
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@ -38,9 +36,9 @@
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#include "dbutil.h"
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#include "ecc.h"
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const unsigned char OID_SEC256R1_BLOB[] = {0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07};
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const unsigned char OID_SEC384R1_BLOB[] = {0x2b, 0x81, 0x04, 0x00, 0x22};
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const unsigned char OID_SEC521R1_BLOB[] = {0x2b, 0x81, 0x04, 0x00, 0x23};
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static const unsigned char OID_SEC256R1_BLOB[] = {0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07};
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static const unsigned char OID_SEC384R1_BLOB[] = {0x2b, 0x81, 0x04, 0x00, 0x22};
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static const unsigned char OID_SEC521R1_BLOB[] = {0x2b, 0x81, 0x04, 0x00, 0x23};
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#define PUT_32BIT(cp, value) do { \
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(cp)[3] = (unsigned char)(value); \
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@ -130,6 +128,8 @@ static sign_key *dropbear_read(const char* filename) {
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}
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buf_free(buf);
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ret->type = type;
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return ret;
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error:
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@ -145,23 +145,11 @@ error:
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/* returns 0 on fail, 1 on success */
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static int dropbear_write(const char*filename, sign_key * key) {
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int keytype = -1;
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buffer * buf;
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FILE*fp;
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int len;
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int ret;
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#ifdef DROPBEAR_RSA
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if (key->rsakey != NULL) {
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keytype = DROPBEAR_SIGNKEY_RSA;
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}
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#endif
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#ifdef DROPBEAR_DSS
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if (key->dsskey != NULL) {
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keytype = DROPBEAR_SIGNKEY_DSS;
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}
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#endif
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buf = buf_new(MAX_PRIVKEY_SIZE);
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buf_put_priv_key(buf, key, key->type);
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@ -616,8 +604,10 @@ static sign_key *openssh_read(const char *filename, char *passphrase)
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if (key->type == OSSH_DSA) {
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buf_putstring(blobbuf, "ssh-dss", 7);
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retkey->type = DROPBEAR_SIGNKEY_DSS;
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} else if (key->type == OSSH_RSA) {
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buf_putstring(blobbuf, "ssh-rsa", 7);
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retkey->type = DROPBEAR_SIGNKEY_RSA;
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}
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for (i = 0; i < num_integers; i++) {
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@ -675,7 +665,6 @@ static sign_key *openssh_read(const char *filename, char *passphrase)
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#ifdef DROPBEAR_ECDSA
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if (key->type == OSSH_EC) {
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const char* ecdsa_name;
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unsigned char* private_key_bytes = NULL;
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int private_key_len = 0;
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unsigned char* public_key_bytes = NULL;
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@ -827,202 +816,282 @@ static int openssh_write(const char *filename, sign_key *key,
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char zero[1];
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int ret = 0;
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FILE *fp;
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int keytype = -1;
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#ifdef DROPBEAR_RSA
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mp_int dmp1, dmq1, iqmp, tmpval; /* for rsa */
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if (key->rsakey != NULL) {
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keytype = DROPBEAR_SIGNKEY_RSA;
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}
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#endif
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#ifdef DROPBEAR_DSS
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if (key->dsskey != NULL) {
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keytype = DROPBEAR_SIGNKEY_DSS;
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}
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#endif
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dropbear_assert(keytype != -1);
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if (key->type == DROPBEAR_SIGNKEY_RSA || key->type == DROPBEAR_SIGNKEY_DSS)
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{
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/*
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* Fetch the key blobs.
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*/
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keyblob = buf_new(3000);
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buf_put_priv_key(keyblob, key, key->type);
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/*
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* Fetch the key blobs.
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*/
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keyblob = buf_new(3000);
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buf_put_priv_key(keyblob, key, keytype);
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buf_setpos(keyblob, 0);
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/* skip the "ssh-rsa" or "ssh-dss" header */
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buf_incrpos(keyblob, buf_getint(keyblob));
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buf_setpos(keyblob, 0);
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/* skip the "ssh-rsa" or "ssh-dss" header */
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buf_incrpos(keyblob, buf_getint(keyblob));
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/*
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* Find the sequence of integers to be encoded into the OpenSSH
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* key blob, and also decide on the header line.
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*/
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numbers[0].start = zero; numbers[0].bytes = 1; zero[0] = '\0';
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/*
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* Find the sequence of integers to be encoded into the OpenSSH
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* key blob, and also decide on the header line.
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*/
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numbers[0].start = zero; numbers[0].bytes = 1; zero[0] = '\0';
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#ifdef DROPBEAR_RSA
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if (key->type == DROPBEAR_SIGNKEY_RSA) {
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#ifdef DROPBEAR_RSA
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if (keytype == DROPBEAR_SIGNKEY_RSA) {
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if (key->rsakey->p == NULL || key->rsakey->q == NULL) {
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fprintf(stderr, "Pre-0.33 Dropbear keys cannot be converted to OpenSSH keys.\n");
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goto error;
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}
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if (key->rsakey->p == NULL || key->rsakey->q == NULL) {
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fprintf(stderr, "Pre-0.33 Dropbear keys cannot be converted to OpenSSH keys.\n");
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goto error;
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/* e */
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numbers[2].bytes = buf_getint(keyblob);
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numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
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buf_incrpos(keyblob, numbers[2].bytes);
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/* n */
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numbers[1].bytes = buf_getint(keyblob);
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numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
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buf_incrpos(keyblob, numbers[1].bytes);
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/* d */
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numbers[3].bytes = buf_getint(keyblob);
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numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
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buf_incrpos(keyblob, numbers[3].bytes);
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/* p */
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numbers[4].bytes = buf_getint(keyblob);
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numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
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buf_incrpos(keyblob, numbers[4].bytes);
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/* q */
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numbers[5].bytes = buf_getint(keyblob);
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numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
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buf_incrpos(keyblob, numbers[5].bytes);
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/* now calculate some extra parameters: */
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m_mp_init(&tmpval);
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m_mp_init(&dmp1);
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m_mp_init(&dmq1);
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m_mp_init(&iqmp);
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/* dmp1 = d mod (p-1) */
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if (mp_sub_d(key->rsakey->p, 1, &tmpval) != MP_OKAY) {
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fprintf(stderr, "Bignum error for p-1\n");
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goto error;
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}
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if (mp_mod(key->rsakey->d, &tmpval, &dmp1) != MP_OKAY) {
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fprintf(stderr, "Bignum error for dmp1\n");
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goto error;
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}
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/* dmq1 = d mod (q-1) */
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if (mp_sub_d(key->rsakey->q, 1, &tmpval) != MP_OKAY) {
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fprintf(stderr, "Bignum error for q-1\n");
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goto error;
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}
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if (mp_mod(key->rsakey->d, &tmpval, &dmq1) != MP_OKAY) {
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fprintf(stderr, "Bignum error for dmq1\n");
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goto error;
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}
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/* iqmp = (q^-1) mod p */
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if (mp_invmod(key->rsakey->q, key->rsakey->p, &iqmp) != MP_OKAY) {
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fprintf(stderr, "Bignum error for iqmp\n");
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goto error;
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}
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extrablob = buf_new(2000);
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buf_putmpint(extrablob, &dmp1);
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buf_putmpint(extrablob, &dmq1);
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buf_putmpint(extrablob, &iqmp);
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buf_setpos(extrablob, 0);
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mp_clear(&dmp1);
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mp_clear(&dmq1);
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mp_clear(&iqmp);
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mp_clear(&tmpval);
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/* dmp1 */
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numbers[6].bytes = buf_getint(extrablob);
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numbers[6].start = buf_getptr(extrablob, numbers[6].bytes);
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buf_incrpos(extrablob, numbers[6].bytes);
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/* dmq1 */
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numbers[7].bytes = buf_getint(extrablob);
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numbers[7].start = buf_getptr(extrablob, numbers[7].bytes);
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buf_incrpos(extrablob, numbers[7].bytes);
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/* iqmp */
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numbers[8].bytes = buf_getint(extrablob);
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numbers[8].start = buf_getptr(extrablob, numbers[8].bytes);
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buf_incrpos(extrablob, numbers[8].bytes);
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nnumbers = 9;
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header = "-----BEGIN RSA PRIVATE KEY-----\n";
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footer = "-----END RSA PRIVATE KEY-----\n";
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}
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#endif /* DROPBEAR_RSA */
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#ifdef DROPBEAR_DSS
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if (key->type == DROPBEAR_SIGNKEY_DSS) {
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/* p */
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numbers[1].bytes = buf_getint(keyblob);
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numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
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buf_incrpos(keyblob, numbers[1].bytes);
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/* q */
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numbers[2].bytes = buf_getint(keyblob);
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numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
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buf_incrpos(keyblob, numbers[2].bytes);
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/* g */
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numbers[3].bytes = buf_getint(keyblob);
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numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
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buf_incrpos(keyblob, numbers[3].bytes);
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/* y */
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numbers[4].bytes = buf_getint(keyblob);
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numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
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buf_incrpos(keyblob, numbers[4].bytes);
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/* x */
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numbers[5].bytes = buf_getint(keyblob);
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numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
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buf_incrpos(keyblob, numbers[5].bytes);
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nnumbers = 6;
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header = "-----BEGIN DSA PRIVATE KEY-----\n";
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footer = "-----END DSA PRIVATE KEY-----\n";
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}
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#endif /* DROPBEAR_DSS */
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/*
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* Now count up the total size of the ASN.1 encoded integers,
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* so as to determine the length of the containing SEQUENCE.
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*/
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len = 0;
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for (i = 0; i < nnumbers; i++) {
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len += ber_write_id_len(NULL, 2, numbers[i].bytes, 0);
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len += numbers[i].bytes;
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}
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seqlen = len;
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/* Now add on the SEQUENCE header. */
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len += ber_write_id_len(NULL, 16, seqlen, ASN1_CONSTRUCTED);
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/* Round up to the cipher block size, ensuring we have at least one
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* byte of padding (see below). */
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outlen = len;
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if (passphrase)
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outlen = (outlen+8) &~ 7;
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/*
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* Now we know how big outblob needs to be. Allocate it.
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*/
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outblob = (unsigned char*)m_malloc(outlen);
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/*
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* And write the data into it.
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*/
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pos = 0;
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pos += ber_write_id_len(outblob+pos, 16, seqlen, ASN1_CONSTRUCTED);
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for (i = 0; i < nnumbers; i++) {
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pos += ber_write_id_len(outblob+pos, 2, numbers[i].bytes, 0);
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memcpy(outblob+pos, numbers[i].start, numbers[i].bytes);
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pos += numbers[i].bytes;
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}
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} // end RSA and DSS handling
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#ifdef DROPBEAR_ECDSA
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if (key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP256
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|| key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
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|| key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP521) {
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/* SEC1 V2 appendix c.4
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ECPrivateKey ::= SEQUENCE {
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version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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privateKey OCTET STRING,
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parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL,
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publicKey [1] BIT STRING OPTIONAL
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}
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*/
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buffer *seq_buf = buf_new(400);
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ecc_key **eck = signkey_ecc_key_ptr(key, key->type);
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const unsigned long curve_size = (*eck)->dp->size;
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int curve_oid_len = 0;
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const void* curve_oid = NULL;
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unsigned long pubkey_size = 2*curve_size+1;
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/* version. less than 10 bytes */
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buf_incrwritepos(seq_buf,
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ber_write_id_len(buf_getwriteptr(seq_buf, 10), 2, 1, 0));
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buf_putbyte(seq_buf, 1);
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/* privateKey */
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dropbear_assert(mp_unsigned_bin_size((*eck)->k) == curve_size);
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buf_incrwritepos(seq_buf,
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ber_write_id_len(buf_getwriteptr(seq_buf, 10), 4, curve_size, 0));
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mp_to_unsigned_bin((*eck)->k, buf_getwriteptr(seq_buf, curve_size));
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buf_incrwritepos(seq_buf, curve_size);
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/* SECGCurveNames */
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switch (key->type)
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{
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case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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curve_oid_len = sizeof(OID_SEC256R1_BLOB);
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curve_oid = OID_SEC256R1_BLOB;
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break;
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case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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curve_oid_len = sizeof(OID_SEC384R1_BLOB);
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curve_oid = OID_SEC384R1_BLOB;
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break;
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case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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curve_oid_len = sizeof(OID_SEC521R1_BLOB);
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curve_oid = OID_SEC521R1_BLOB;
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break;
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default:
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dropbear_exit("Internal error");
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}
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/* e */
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numbers[2].bytes = buf_getint(keyblob);
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numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
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buf_incrpos(keyblob, numbers[2].bytes);
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/* n */
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numbers[1].bytes = buf_getint(keyblob);
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numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
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buf_incrpos(keyblob, numbers[1].bytes);
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/* d */
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numbers[3].bytes = buf_getint(keyblob);
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numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
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buf_incrpos(keyblob, numbers[3].bytes);
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/* p */
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numbers[4].bytes = buf_getint(keyblob);
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numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
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buf_incrpos(keyblob, numbers[4].bytes);
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/* q */
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numbers[5].bytes = buf_getint(keyblob);
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numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
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buf_incrpos(keyblob, numbers[5].bytes);
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buf_incrwritepos(seq_buf,
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ber_write_id_len(buf_getwriteptr(seq_buf, 10), 0, 2+curve_oid_len, 0xa0));
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// object == 6
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buf_incrwritepos(seq_buf,
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ber_write_id_len(buf_getwriteptr(seq_buf, 10), 6, curve_oid_len, 0));
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buf_putbytes(seq_buf, curve_oid, curve_oid_len);
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/* now calculate some extra parameters: */
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m_mp_init(&tmpval);
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m_mp_init(&dmp1);
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m_mp_init(&dmq1);
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m_mp_init(&iqmp);
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/* dmp1 = d mod (p-1) */
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if (mp_sub_d(key->rsakey->p, 1, &tmpval) != MP_OKAY) {
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fprintf(stderr, "Bignum error for p-1\n");
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goto error;
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}
|
||||
if (mp_mod(key->rsakey->d, &tmpval, &dmp1) != MP_OKAY) {
|
||||
fprintf(stderr, "Bignum error for dmp1\n");
|
||||
goto error;
|
||||
buf_incrwritepos(seq_buf,
|
||||
ber_write_id_len(buf_getwriteptr(seq_buf, 10), 1, 2+1+pubkey_size, 0xa0));
|
||||
buf_incrwritepos(seq_buf,
|
||||
ber_write_id_len(buf_getwriteptr(seq_buf, 10), 3, 1+pubkey_size, 0));
|
||||
buf_putbyte(seq_buf, 0);
|
||||
int err = ecc_ansi_x963_export(*eck, buf_getwriteptr(seq_buf, pubkey_size), &pubkey_size);
|
||||
if (err != CRYPT_OK) {
|
||||
dropbear_exit("ECC error");
|
||||
}
|
||||
buf_incrwritepos(seq_buf, pubkey_size);
|
||||
|
||||
/* dmq1 = d mod (q-1) */
|
||||
if (mp_sub_d(key->rsakey->q, 1, &tmpval) != MP_OKAY) {
|
||||
fprintf(stderr, "Bignum error for q-1\n");
|
||||
goto error;
|
||||
}
|
||||
if (mp_mod(key->rsakey->d, &tmpval, &dmq1) != MP_OKAY) {
|
||||
fprintf(stderr, "Bignum error for dmq1\n");
|
||||
goto error;
|
||||
}
|
||||
buf_setpos(seq_buf, 0);
|
||||
|
||||
outblob = (unsigned char*)m_malloc(200);
|
||||
|
||||
/* iqmp = (q^-1) mod p */
|
||||
if (mp_invmod(key->rsakey->q, key->rsakey->p, &iqmp) != MP_OKAY) {
|
||||
fprintf(stderr, "Bignum error for iqmp\n");
|
||||
goto error;
|
||||
}
|
||||
pos = 0;
|
||||
pos += ber_write_id_len(outblob+pos, 16, seq_buf->len, ASN1_CONSTRUCTED);
|
||||
memcpy(&outblob[pos], seq_buf->data, seq_buf->len);
|
||||
pos += seq_buf->len;
|
||||
len = pos;
|
||||
outlen = len;
|
||||
|
||||
extrablob = buf_new(2000);
|
||||
buf_putmpint(extrablob, &dmp1);
|
||||
buf_putmpint(extrablob, &dmq1);
|
||||
buf_putmpint(extrablob, &iqmp);
|
||||
buf_setpos(extrablob, 0);
|
||||
mp_clear(&dmp1);
|
||||
mp_clear(&dmq1);
|
||||
mp_clear(&iqmp);
|
||||
mp_clear(&tmpval);
|
||||
|
||||
/* dmp1 */
|
||||
numbers[6].bytes = buf_getint(extrablob);
|
||||
numbers[6].start = buf_getptr(extrablob, numbers[6].bytes);
|
||||
buf_incrpos(extrablob, numbers[6].bytes);
|
||||
|
||||
/* dmq1 */
|
||||
numbers[7].bytes = buf_getint(extrablob);
|
||||
numbers[7].start = buf_getptr(extrablob, numbers[7].bytes);
|
||||
buf_incrpos(extrablob, numbers[7].bytes);
|
||||
|
||||
/* iqmp */
|
||||
numbers[8].bytes = buf_getint(extrablob);
|
||||
numbers[8].start = buf_getptr(extrablob, numbers[8].bytes);
|
||||
buf_incrpos(extrablob, numbers[8].bytes);
|
||||
buf_burn(seq_buf);
|
||||
buf_free(seq_buf);
|
||||
seq_buf = NULL;
|
||||
|
||||
nnumbers = 9;
|
||||
header = "-----BEGIN RSA PRIVATE KEY-----\n";
|
||||
footer = "-----END RSA PRIVATE KEY-----\n";
|
||||
}
|
||||
#endif /* DROPBEAR_RSA */
|
||||
|
||||
#ifdef DROPBEAR_DSS
|
||||
if (keytype == DROPBEAR_SIGNKEY_DSS) {
|
||||
|
||||
/* p */
|
||||
numbers[1].bytes = buf_getint(keyblob);
|
||||
numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
|
||||
buf_incrpos(keyblob, numbers[1].bytes);
|
||||
|
||||
/* q */
|
||||
numbers[2].bytes = buf_getint(keyblob);
|
||||
numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
|
||||
buf_incrpos(keyblob, numbers[2].bytes);
|
||||
|
||||
/* g */
|
||||
numbers[3].bytes = buf_getint(keyblob);
|
||||
numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
|
||||
buf_incrpos(keyblob, numbers[3].bytes);
|
||||
|
||||
/* y */
|
||||
numbers[4].bytes = buf_getint(keyblob);
|
||||
numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
|
||||
buf_incrpos(keyblob, numbers[4].bytes);
|
||||
|
||||
/* x */
|
||||
numbers[5].bytes = buf_getint(keyblob);
|
||||
numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
|
||||
buf_incrpos(keyblob, numbers[5].bytes);
|
||||
|
||||
nnumbers = 6;
|
||||
header = "-----BEGIN DSA PRIVATE KEY-----\n";
|
||||
footer = "-----END DSA PRIVATE KEY-----\n";
|
||||
}
|
||||
#endif /* DROPBEAR_DSS */
|
||||
|
||||
/*
|
||||
* Now count up the total size of the ASN.1 encoded integers,
|
||||
* so as to determine the length of the containing SEQUENCE.
|
||||
*/
|
||||
len = 0;
|
||||
for (i = 0; i < nnumbers; i++) {
|
||||
len += ber_write_id_len(NULL, 2, numbers[i].bytes, 0);
|
||||
len += numbers[i].bytes;
|
||||
}
|
||||
seqlen = len;
|
||||
/* Now add on the SEQUENCE header. */
|
||||
len += ber_write_id_len(NULL, 16, seqlen, ASN1_CONSTRUCTED);
|
||||
/* Round up to the cipher block size, ensuring we have at least one
|
||||
* byte of padding (see below). */
|
||||
outlen = len;
|
||||
if (passphrase)
|
||||
outlen = (outlen+8) &~ 7;
|
||||
|
||||
/*
|
||||
* Now we know how big outblob needs to be. Allocate it.
|
||||
*/
|
||||
outblob = (unsigned char*)m_malloc(outlen);
|
||||
|
||||
/*
|
||||
* And write the data into it.
|
||||
*/
|
||||
pos = 0;
|
||||
pos += ber_write_id_len(outblob+pos, 16, seqlen, ASN1_CONSTRUCTED);
|
||||
for (i = 0; i < nnumbers; i++) {
|
||||
pos += ber_write_id_len(outblob+pos, 2, numbers[i].bytes, 0);
|
||||
memcpy(outblob+pos, numbers[i].start, numbers[i].bytes);
|
||||
pos += numbers[i].bytes;
|
||||
header = "-----BEGIN EC PRIVATE KEY-----\n";
|
||||
footer = "-----END EC PRIVATE KEY-----\n";
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Padding on OpenSSH keys is deterministic. The number of
|
||||
|
||||
Loading…
Reference in New Issue
Block a user