[openssh.git] / key.c

/*
 * read_bignum():
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 *
 *
 * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "includes.h"
RCSID("$OpenBSD: key.c,v 1.33 2001/10/04 14:34:16 markus Exp $");

#include <openssl/evp.h>

#include "xmalloc.h"
#include "key.h"
#include "rsa.h"
#include "ssh-dss.h"
#include "ssh-rsa.h"
#include "uuencode.h"
#include "buffer.h"
#include "bufaux.h"
#include "log.h"

Key *
key_new(int type)
{
	Key *k;
	RSA *rsa;
	DSA *dsa;
	k = xmalloc(sizeof(*k));
	k->type = type;
	k->flags = 0;
	k->dsa = NULL;
	k->rsa = NULL;
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		rsa = RSA_new();
		rsa->n = BN_new();
		rsa->e = BN_new();
		k->rsa = rsa;
		break;
	case KEY_DSA:
		dsa = DSA_new();
		dsa->p = BN_new();
		dsa->q = BN_new();
		dsa->g = BN_new();
		dsa->pub_key = BN_new();
		k->dsa = dsa;
		break;
	case KEY_UNSPEC:
		break;
	default:
		fatal("key_new: bad key type %d", k->type);
		break;
	}
	return k;
}
Key *
key_new_private(int type)
{
	Key *k = key_new(type);
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		k->rsa->d = BN_new();
		k->rsa->iqmp = BN_new();
		k->rsa->q = BN_new();
		k->rsa->p = BN_new();
		k->rsa->dmq1 = BN_new();
		k->rsa->dmp1 = BN_new();
		break;
	case KEY_DSA:
		k->dsa->priv_key = BN_new();
		break;
	case KEY_UNSPEC:
		break;
	default:
		break;
	}
	return k;
}
void
key_free(Key *k)
{
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		if (k->rsa != NULL)
			RSA_free(k->rsa);
		k->rsa = NULL;
		break;
	case KEY_DSA:
		if (k->dsa != NULL)
			DSA_free(k->dsa);
		k->dsa = NULL;
		break;
	case KEY_UNSPEC:
		break;
	default:
		fatal("key_free: bad key type %d", k->type);
		break;
	}
	xfree(k);
}
int
key_equal(Key *a, Key *b)
{
	if (a == NULL || b == NULL || a->type != b->type)
		return 0;
	switch (a->type) {
	case KEY_RSA1:
	case KEY_RSA:
		return a->rsa != NULL && b->rsa != NULL &&
		    BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
		    BN_cmp(a->rsa->n, b->rsa->n) == 0;
		break;
	case KEY_DSA:
		return a->dsa != NULL && b->dsa != NULL &&
		    BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
		    BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
		    BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
		    BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
		break;
	default:
		fatal("key_equal: bad key type %d", a->type);
		break;
	}
	return 0;
}

static u_char*
key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length)
{
	EVP_MD *md = NULL;
	EVP_MD_CTX ctx;
	u_char *blob = NULL;
	u_char *retval = NULL;
	int len = 0;
	int nlen, elen;

	*dgst_raw_length = 0;

	switch (dgst_type) {
	case SSH_FP_MD5:
		md = EVP_md5();
		break;
	case SSH_FP_SHA1:
		md = EVP_sha1();
		break;
	default:
		fatal("key_fingerprint_raw: bad digest type %d",
		    dgst_type);
	}
	switch (k->type) {
	case KEY_RSA1:
		nlen = BN_num_bytes(k->rsa->n);
		elen = BN_num_bytes(k->rsa->e);
		len = nlen + elen;
		blob = xmalloc(len);
		BN_bn2bin(k->rsa->n, blob);
		BN_bn2bin(k->rsa->e, blob + nlen);
		break;
	case KEY_DSA:
	case KEY_RSA:
		key_to_blob(k, &blob, &len);
		break;
	case KEY_UNSPEC:
		return retval;
		break;
	default:
		fatal("key_fingerprint_raw: bad key type %d", k->type);
		break;
	}
	if (blob != NULL) {
		retval = xmalloc(EVP_MAX_MD_SIZE);
		EVP_DigestInit(&ctx, md);
		EVP_DigestUpdate(&ctx, blob, len);
		EVP_DigestFinal(&ctx, retval, NULL);
		*dgst_raw_length = md->md_size;
		memset(blob, 0, len);
		xfree(blob);
	} else {
		fatal("key_fingerprint_raw: blob is null");
	}
	return retval;
}

static char*
key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
{
	char *retval;
	int i;

	retval = xmalloc(dgst_raw_len * 3 + 1);
	retval[0] = '\0';
	for(i = 0; i < dgst_raw_len; i++) {
		char hex[4];
		snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
		strlcat(retval, hex, dgst_raw_len * 3);
	}
	retval[(dgst_raw_len * 3) - 1] = '\0';
	return retval;
}

static char*
key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
{
	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
	    'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
	u_int i, j = 0, rounds, seed = 1;
	char *retval;

	rounds = (dgst_raw_len / 2) + 1;
	retval = xmalloc(sizeof(char) * (rounds*6));
	retval[j++] = 'x';
	for (i = 0; i < rounds; i++) {
		u_int idx0, idx1, idx2, idx3, idx4;
		if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
			idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
			    seed) % 6;
			idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
			idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
			    (seed / 6)) % 6;
			retval[j++] = vowels[idx0];
			retval[j++] = consonants[idx1];
			retval[j++] = vowels[idx2];
			if ((i + 1) < rounds) {
				idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
				idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
				retval[j++] = consonants[idx3];
				retval[j++] = '-';
				retval[j++] = consonants[idx4];
				seed = ((seed * 5) +
				    ((((u_int)(dgst_raw[2 * i])) * 7) +
				    ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
			}
		} else {
			idx0 = seed % 6;
			idx1 = 16;
			idx2 = seed / 6;
			retval[j++] = vowels[idx0];
			retval[j++] = consonants[idx1];
			retval[j++] = vowels[idx2];
		}
	}
	retval[j++] = 'x';
	retval[j++] = '\0';
	return retval;
}

char*
key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
{
	char *retval = NULL;
	u_char *dgst_raw;
	size_t dgst_raw_len;
	
	dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
	if (!dgst_raw)
		fatal("key_fingerprint: null from key_fingerprint_raw()");
	switch(dgst_rep) {
	case SSH_FP_HEX:
		retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
		break;
	case SSH_FP_BUBBLEBABBLE:
		retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
		break;
	default:
		fatal("key_fingerprint_ex: bad digest representation %d",
		    dgst_rep);
		break;
	}
	memset(dgst_raw, 0, dgst_raw_len);
	xfree(dgst_raw);
	return retval;
}

/*
 * Reads a multiple-precision integer in decimal from the buffer, and advances
 * the pointer.  The integer must already be initialized.  This function is
 * permitted to modify the buffer.  This leaves *cpp to point just beyond the
 * last processed (and maybe modified) character.  Note that this may modify
 * the buffer containing the number.
 */
static int
read_bignum(char **cpp, BIGNUM * value)
{
	char *cp = *cpp;
	int old;

	/* Skip any leading whitespace. */
	for (; *cp == ' ' || *cp == '\t'; cp++)
		;

	/* Check that it begins with a decimal digit. */
	if (*cp < '0' || *cp > '9')
		return 0;

	/* Save starting position. */
	*cpp = cp;

	/* Move forward until all decimal digits skipped. */
	for (; *cp >= '0' && *cp <= '9'; cp++)
		;

	/* Save the old terminating character, and replace it by \0. */
	old = *cp;
	*cp = 0;

	/* Parse the number. */
	if (BN_dec2bn(&value, *cpp) == 0)
		return 0;

	/* Restore old terminating character. */
	*cp = old;

	/* Move beyond the number and return success. */
	*cpp = cp;
	return 1;
}
static int
write_bignum(FILE *f, BIGNUM *num)
{
	char *buf = BN_bn2dec(num);
	if (buf == NULL) {
		error("write_bignum: BN_bn2dec() failed");
		return 0;
	}
	fprintf(f, " %s", buf);
	OPENSSL_free(buf);
	return 1;
}

/* returns 1 ok, -1 error */
int
key_read(Key *ret, char **cpp)
{
	Key *k;
	int success = -1;
	char *cp, *space;
	int len, n, type;
	u_int bits;
	u_char *blob;

	cp = *cpp;

	switch(ret->type) {
	case KEY_RSA1:
		/* Get number of bits. */
		if (*cp < '0' || *cp > '9')
			return -1;	/* Bad bit count... */
		for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
			bits = 10 * bits + *cp - '0';
		if (bits == 0)
			return -1;
		*cpp = cp;
		/* Get public exponent, public modulus. */
		if (!read_bignum(cpp, ret->rsa->e))
			return -1;
		if (!read_bignum(cpp, ret->rsa->n))
			return -1;
		success = 1;
		break;
	case KEY_UNSPEC:
	case KEY_RSA:
	case KEY_DSA:
		space = strchr(cp, ' ');
		if (space == NULL) {
			debug3("key_read: no space");
			return -1;
		}
		*space = '\0';
		type = key_type_from_name(cp);
		*space = ' ';
		if (type == KEY_UNSPEC) {
			debug3("key_read: no key found");
			return -1;
		}
		cp = space+1;
		if (*cp == '\0') {
			debug3("key_read: short string");
			return -1;
		}
		if (ret->type == KEY_UNSPEC) {
			ret->type = type;
		} else if (ret->type != type) {
			/* is a key, but different type */
			debug3("key_read: type mismatch");
			return -1;
		}
		len = 2*strlen(cp);
		blob = xmalloc(len);
		n = uudecode(cp, blob, len);
		if (n < 0) {
			error("key_read: uudecode %s failed", cp);
			return -1;
		}
		k = key_from_blob(blob, n);
		if (k == NULL) {
			error("key_read: key_from_blob %s failed", cp);
			return -1;
		}
		xfree(blob);
		if (k->type != type) {
			error("key_read: type mismatch: encoding error");
			key_free(k);
			return -1;
		}
/*XXXX*/
		if (ret->type == KEY_RSA) {
			if (ret->rsa != NULL)
				RSA_free(ret->rsa);
			ret->rsa = k->rsa;
			k->rsa = NULL;
			success = 1;
#ifdef DEBUG_PK
			RSA_print_fp(stderr, ret->rsa, 8);
#endif
		} else {
			if (ret->dsa != NULL)
				DSA_free(ret->dsa);
			ret->dsa = k->dsa;
			k->dsa = NULL;
			success = 1;
#ifdef DEBUG_PK
			DSA_print_fp(stderr, ret->dsa, 8);
#endif
		}
/*XXXX*/
		if (success != 1)
			break;
		key_free(k);
		/* advance cp: skip whitespace and data */
		while (*cp == ' ' || *cp == '\t')
			cp++;
		while (*cp != '\0' && *cp != ' ' && *cp != '\t')
			cp++;
		*cpp = cp;
		break;
	default:
		fatal("key_read: bad key type: %d", ret->type);
		break;
	}
	return success;
}
int
key_write(Key *key, FILE *f)
{
	int success = 0;
	u_int bits = 0;

	if (key->type == KEY_RSA1 && key->rsa != NULL) {
		/* size of modulus 'n' */
		bits = BN_num_bits(key->rsa->n);
		fprintf(f, "%u", bits);
		if (write_bignum(f, key->rsa->e) &&
		    write_bignum(f, key->rsa->n)) {
			success = 1;
		} else {
			error("key_write: failed for RSA key");
		}
	} else if ((key->type == KEY_DSA && key->dsa != NULL) ||
	    (key->type == KEY_RSA && key->rsa != NULL)) {
		int len, n;
		u_char *blob, *uu;
		key_to_blob(key, &blob, &len);
		uu = xmalloc(2*len);
		n = uuencode(blob, len, uu, 2*len);
		if (n > 0) {
			fprintf(f, "%s %s", key_ssh_name(key), uu);
			success = 1;
		}
		xfree(blob);
		xfree(uu);
	}
	return success;
}
char *
key_type(Key *k)
{
	switch (k->type) {
	case KEY_RSA1:
		return "RSA1";
		break;
	case KEY_RSA:
		return "RSA";
		break;
	case KEY_DSA:
		return "DSA";
		break;
	}
	return "unknown";
}
char *
key_ssh_name(Key *k)
{
	switch (k->type) {
	case KEY_RSA:
		return "ssh-rsa";
		break;
	case KEY_DSA:
		return "ssh-dss";
		break;
	}
	return "ssh-unknown";
}
u_int
key_size(Key *k){
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		return BN_num_bits(k->rsa->n);
		break;
	case KEY_DSA:
		return BN_num_bits(k->dsa->p);
		break;
	}
	return 0;
}

static RSA *
rsa_generate_private_key(u_int bits)
{
	RSA *private;
	private = RSA_generate_key(bits, 35, NULL, NULL);
	if (private == NULL)
		fatal("rsa_generate_private_key: key generation failed.");
	return private;
}

static DSA*
dsa_generate_private_key(u_int bits)
{
	DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
	if (private == NULL)
		fatal("dsa_generate_private_key: DSA_generate_parameters failed");
	if (!DSA_generate_key(private))
		fatal("dsa_generate_private_key: DSA_generate_key failed.");
	if (private == NULL)
		fatal("dsa_generate_private_key: NULL.");
	return private;
}

Key *
key_generate(int type, u_int bits)
{
	Key *k = key_new(KEY_UNSPEC);
	switch (type) {
	case KEY_DSA:
		k->dsa = dsa_generate_private_key(bits);
		break;
	case KEY_RSA:
	case KEY_RSA1:
		k->rsa = rsa_generate_private_key(bits);
		break;
	default:
		fatal("key_generate: unknown type %d", type);
	}
	k->type = type;
	return k;
}

Key *
key_from_private(Key *k)
{
	Key *n = NULL;
	switch (k->type) {
	case KEY_DSA:
		n = key_new(k->type);
		BN_copy(n->dsa->p, k->dsa->p);
		BN_copy(n->dsa->q, k->dsa->q);
		BN_copy(n->dsa->g, k->dsa->g);
		BN_copy(n->dsa->pub_key, k->dsa->pub_key);
		break;
	case KEY_RSA:
	case KEY_RSA1:
		n = key_new(k->type);
		BN_copy(n->rsa->n, k->rsa->n);
		BN_copy(n->rsa->e, k->rsa->e);
		break;
	default:
		fatal("key_from_private: unknown type %d", k->type);
		break;
	}
	return n;
}

int
key_type_from_name(char *name)
{
	if (strcmp(name, "rsa1") == 0){
		return KEY_RSA1;
	} else if (strcmp(name, "rsa") == 0){
		return KEY_RSA;
	} else if (strcmp(name, "dsa") == 0){
		return KEY_DSA;
	} else if (strcmp(name, "ssh-rsa") == 0){
		return KEY_RSA;
	} else if (strcmp(name, "ssh-dss") == 0){
		return KEY_DSA;
	}
	debug2("key_type_from_name: unknown key type '%s'", name);
	return KEY_UNSPEC;
}

int
key_names_valid2(const char *names)
{
	char *s, *cp, *p;

	if (names == NULL || strcmp(names, "") == 0)
		return 0;
	s = cp = xstrdup(names);
	for ((p = strsep(&cp, ",")); p && *p != '\0';
	     (p = strsep(&cp, ","))) {
		switch (key_type_from_name(p)) {
		case KEY_RSA1:
		case KEY_UNSPEC:
			xfree(s);
			return 0;
		}
	}
	debug3("key names ok: [%s]", names);
	xfree(s);
	return 1;
}

Key *
key_from_blob(u_char *blob, int blen)
{
	Buffer b;
	char *ktype;
	int rlen, type;
	Key *key = NULL;

#ifdef DEBUG_PK
	dump_base64(stderr, blob, blen);
#endif
	buffer_init(&b);
	buffer_append(&b, blob, blen);
	ktype = buffer_get_string(&b, NULL);
	type = key_type_from_name(ktype);

	switch(type){
	case KEY_RSA:
		key = key_new(type);
		buffer_get_bignum2(&b, key->rsa->e);
		buffer_get_bignum2(&b, key->rsa->n);
#ifdef DEBUG_PK
		RSA_print_fp(stderr, key->rsa, 8);
#endif
		break;
	case KEY_DSA:
		key = key_new(type);
		buffer_get_bignum2(&b, key->dsa->p);
		buffer_get_bignum2(&b, key->dsa->q);
		buffer_get_bignum2(&b, key->dsa->g);
		buffer_get_bignum2(&b, key->dsa->pub_key);
#ifdef DEBUG_PK
		DSA_print_fp(stderr, key->dsa, 8);
#endif
		break;
	case KEY_UNSPEC:
		key = key_new(type);
		break;
	default:
		error("key_from_blob: cannot handle type %s", ktype);
		break;
	}
	rlen = buffer_len(&b);
	if (key != NULL && rlen != 0)
		error("key_from_blob: remaining bytes in key blob %d", rlen);
	xfree(ktype);
	buffer_free(&b);
	return key;
}

int
key_to_blob(Key *key, u_char **blobp, u_int *lenp)
{
	Buffer b;
	int len;
	u_char *buf;

	if (key == NULL) {
		error("key_to_blob: key == NULL");
		return 0;
	}
	buffer_init(&b);
	switch(key->type){
	case KEY_DSA:
		buffer_put_cstring(&b, key_ssh_name(key));
		buffer_put_bignum2(&b, key->dsa->p);
		buffer_put_bignum2(&b, key->dsa->q);
		buffer_put_bignum2(&b, key->dsa->g);
		buffer_put_bignum2(&b, key->dsa->pub_key);
		break;
	case KEY_RSA:
		buffer_put_cstring(&b, key_ssh_name(key));
		buffer_put_bignum2(&b, key->rsa->e);
		buffer_put_bignum2(&b, key->rsa->n);
		break;
	default:
		error("key_to_blob: unsupported key type %d", key->type);
		buffer_free(&b);
		return 0;
	}
	len = buffer_len(&b);
	buf = xmalloc(len);
	memcpy(buf, buffer_ptr(&b), len);
	memset(buffer_ptr(&b), 0, len);
	buffer_free(&b);
	if (lenp != NULL)
		*lenp = len;
	if (blobp != NULL)
		*blobp = buf;
	return len;
}

int
key_sign(
    Key *key,
    u_char **sigp, int *lenp,
    u_char *data, int datalen)
{
	switch(key->type){
	case KEY_DSA:
		return ssh_dss_sign(key, sigp, lenp, data, datalen);
		break;
	case KEY_RSA:
		return ssh_rsa_sign(key, sigp, lenp, data, datalen);
		break;
	default:
		error("key_sign: illegal key type %d", key->type);
		return -1;
		break;
	}
}

int
key_verify(
    Key *key,
    u_char *signature, int signaturelen,
    u_char *data, int datalen)
{
	if (signaturelen == 0)
		return -1;

	switch(key->type){
	case KEY_DSA:
		return ssh_dss_verify(key, signature, signaturelen, data, datalen);
		break;
	case KEY_RSA:
		return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
		break;
	default:
		error("key_verify: illegal key type %d", key->type);
		return -1;
		break;
	}
}
Commit	Line	Data
4fe2af09	1	/*
bcbf86ec	2	* read_bignum():
	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	4	*
	5	* As far as I am concerned, the code I have written for this software
	6	* can be used freely for any purpose. Any derived versions of this
	7	* software must be clearly marked as such, and if the derived work is
	8	* incompatible with the protocol description in the RFC file, it must be
	9	* called by a name other than "ssh" or "Secure Shell".
	10	*
	11	*
a96070d4	12	* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4fe2af09	13	*
	14	* Redistribution and use in source and binary forms, with or without
	15	* modification, are permitted provided that the following conditions
	16	* are met:
	17	* 1. Redistributions of source code must retain the above copyright
	18	* notice, this list of conditions and the following disclaimer.
	19	* 2. Redistributions in binary form must reproduce the above copyright
	20	* notice, this list of conditions and the following disclaimer in the
	21	* documentation and/or other materials provided with the distribution.
4fe2af09	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	24	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	25	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	26	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	27	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	28	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	29	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	30	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	31	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	32	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
4fe2af09	34	#include "includes.h"
c48c32c1	35	RCSID("$OpenBSD: key.c,v 1.33 2001/10/04 14:34:16 markus Exp $");
42f11eb2	36
4fe2af09	37	#include <openssl/evp.h>
42f11eb2	38
4fe2af09	39	#include "xmalloc.h"
4fe2af09	40	#include "key.h"
fa08c86b	41	#include "rsa.h"
	42	#include "ssh-dss.h"
	43	#include "ssh-rsa.h"
a306f2dd	44	#include "uuencode.h"
fa08c86b	45	#include "buffer.h"
fa08c86b	46	#include "bufaux.h"
42f11eb2	47	#include "log.h"
4fe2af09	48
	49	Key *
	50	key_new(int type)
	51	{
	52	Key *k;
	53	RSA *rsa;
	54	DSA *dsa;
	55	k = xmalloc(sizeof(*k));
	56	k->type = type;
383546c4	57	k->flags = 0;
a306f2dd	58	k->dsa = NULL;
a306f2dd	59	k->rsa = NULL;
4fe2af09	60	switch (k->type) {
fa08c86b	61	case KEY_RSA1:
4fe2af09	62	case KEY_RSA:
	63	rsa = RSA_new();
	64	rsa->n = BN_new();
	65	rsa->e = BN_new();
	66	k->rsa = rsa;
	67	break;
	68	case KEY_DSA:
	69	dsa = DSA_new();
	70	dsa->p = BN_new();
	71	dsa->q = BN_new();
	72	dsa->g = BN_new();
	73	dsa->pub_key = BN_new();
	74	k->dsa = dsa;
	75	break;
fa08c86b	76	case KEY_UNSPEC:
4fe2af09	77	break;
	78	default:
	79	fatal("key_new: bad key type %d", k->type);
	80	break;
	81	}
	82	return k;
	83	}
fa08c86b	84	Key *
	85	key_new_private(int type)
	86	{
	87	Key *k = key_new(type);
	88	switch (k->type) {
	89	case KEY_RSA1:
	90	case KEY_RSA:
	91	k->rsa->d = BN_new();
	92	k->rsa->iqmp = BN_new();
	93	k->rsa->q = BN_new();
	94	k->rsa->p = BN_new();
	95	k->rsa->dmq1 = BN_new();
	96	k->rsa->dmp1 = BN_new();
	97	break;
	98	case KEY_DSA:
	99	k->dsa->priv_key = BN_new();
	100	break;
	101	case KEY_UNSPEC:
	102	break;
	103	default:
	104	break;
	105	}
	106	return k;
	107	}
4fe2af09	108	void
	109	key_free(Key *k)
	110	{
	111	switch (k->type) {
fa08c86b	112	case KEY_RSA1:
4fe2af09	113	case KEY_RSA:
	114	if (k->rsa != NULL)
	115	RSA_free(k->rsa);
	116	k->rsa = NULL;
	117	break;
	118	case KEY_DSA:
	119	if (k->dsa != NULL)
	120	DSA_free(k->dsa);
	121	k->dsa = NULL;
	122	break;
fa08c86b	123	case KEY_UNSPEC:
fa08c86b	124	break;
4fe2af09	125	default:
	126	fatal("key_free: bad key type %d", k->type);
	127	break;
	128	}
	129	xfree(k);
	130	}
	131	int
	132	key_equal(Key a, Key b)
	133	{
	134	if (a == NULL \|\| b == NULL \|\| a->type != b->type)
	135	return 0;
	136	switch (a->type) {
fa08c86b	137	case KEY_RSA1:
4fe2af09	138	case KEY_RSA:
	139	return a->rsa != NULL && b->rsa != NULL &&
	140	BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
	141	BN_cmp(a->rsa->n, b->rsa->n) == 0;
	142	break;
	143	case KEY_DSA:
	144	return a->dsa != NULL && b->dsa != NULL &&
	145	BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
	146	BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
	147	BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
	148	BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
	149	break;
	150	default:
a306f2dd	151	fatal("key_equal: bad key type %d", a->type);
4fe2af09	152	break;
	153	}
	154	return 0;
	155	}
	156
396c147e	157	static u_char*
301e8e5b	158	key_fingerprint_raw(Key k, enum fp_type dgst_type, size_t dgst_raw_length)
4fe2af09	159	{
79c9ac1b	160	EVP_MD *md = NULL;
79c9ac1b	161	EVP_MD_CTX ctx;
1e3b8b07	162	u_char *blob = NULL;
301e8e5b	163	u_char *retval = NULL;
4fe2af09	164	int len = 0;
a306f2dd	165	int nlen, elen;
4fe2af09	166
301e8e5b	167	*dgst_raw_length = 0;
301e8e5b	168
79c9ac1b	169	switch (dgst_type) {
	170	case SSH_FP_MD5:
	171	md = EVP_md5();
	172	break;
	173	case SSH_FP_SHA1:
	174	md = EVP_sha1();
	175	break;
	176	default:
	177	fatal("key_fingerprint_raw: bad digest type %d",
	178	dgst_type);
	179	}
4fe2af09	180	switch (k->type) {
fa08c86b	181	case KEY_RSA1:
4fe2af09	182	nlen = BN_num_bytes(k->rsa->n);
	183	elen = BN_num_bytes(k->rsa->e);
	184	len = nlen + elen;
a306f2dd	185	blob = xmalloc(len);
	186	BN_bn2bin(k->rsa->n, blob);
	187	BN_bn2bin(k->rsa->e, blob + nlen);
4fe2af09	188	break;
4fe2af09	189	case KEY_DSA:
fa08c86b	190	case KEY_RSA:
	191	key_to_blob(k, &blob, &len);
	192	break;
	193	case KEY_UNSPEC:
	194	return retval;
4fe2af09	195	break;
4fe2af09	196	default:
301e8e5b	197	fatal("key_fingerprint_raw: bad key type %d", k->type);
4fe2af09	198	break;
4fe2af09	199	}
a306f2dd	200	if (blob != NULL) {
301e8e5b	201	retval = xmalloc(EVP_MAX_MD_SIZE);
74fc9186	202	EVP_DigestInit(&ctx, md);
74fc9186	203	EVP_DigestUpdate(&ctx, blob, len);
301e8e5b	204	EVP_DigestFinal(&ctx, retval, NULL);
301e8e5b	205	*dgst_raw_length = md->md_size;
a306f2dd	206	memset(blob, 0, len);
a306f2dd	207	xfree(blob);
301e8e5b	208	} else {
301e8e5b	209	fatal("key_fingerprint_raw: blob is null");
4fe2af09	210	}
	211	return retval;
	212	}
	213
396c147e	214	static char*
cd332296	215	key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
301e8e5b	216	{
	217	char *retval;
	218	int i;
	219
a88b7b57	220	retval = xmalloc(dgst_raw_len * 3 + 1);
301e8e5b	221	retval[0] = '\0';
	222	for(i = 0; i < dgst_raw_len; i++) {
	223	char hex[4];
	224	snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
	225	strlcat(retval, hex, dgst_raw_len * 3);
	226	}
	227	retval[(dgst_raw_len * 3) - 1] = '\0';
	228	return retval;
	229	}
	230
396c147e	231	static char*
cd332296	232	key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
301e8e5b	233	{
	234	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
	235	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
	236	'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
08345971	237	u_int i, j = 0, rounds, seed = 1;
301e8e5b	238	char *retval;
	239
	240	rounds = (dgst_raw_len / 2) + 1;
	241	retval = xmalloc(sizeof(char) * (rounds*6));
08345971	242	retval[j++] = 'x';
08345971	243	for (i = 0; i < rounds; i++) {
301e8e5b	244	u_int idx0, idx1, idx2, idx3, idx4;
08345971	245	if ((i + 1 < rounds) \|\| (dgst_raw_len % 2 != 0)) {
08345971	246	idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
301e8e5b	247	seed) % 6;
08345971	248	idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
08345971	249	idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
301e8e5b	250	(seed / 6)) % 6;
08345971	251	retval[j++] = vowels[idx0];
	252	retval[j++] = consonants[idx1];
	253	retval[j++] = vowels[idx2];
	254	if ((i + 1) < rounds) {
	255	idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
	256	idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
	257	retval[j++] = consonants[idx3];
	258	retval[j++] = '-';
	259	retval[j++] = consonants[idx4];
301e8e5b	260	seed = ((seed * 5) +
08345971	261	((((u_int)(dgst_raw[2 * i])) * 7) +
08345971	262	((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
301e8e5b	263	}
	264	} else {
	265	idx0 = seed % 6;
	266	idx1 = 16;
	267	idx2 = seed / 6;
08345971	268	retval[j++] = vowels[idx0];
	269	retval[j++] = consonants[idx1];
	270	retval[j++] = vowels[idx2];
301e8e5b	271	}
301e8e5b	272	}
08345971	273	retval[j++] = 'x';
08345971	274	retval[j++] = '\0';
301e8e5b	275	return retval;
	276	}
	277
	278	char*
22138a36	279	key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
301e8e5b	280	{
cd332296	281	char *retval = NULL;
301e8e5b	282	u_char *dgst_raw;
cd332296	283	size_t dgst_raw_len;
301e8e5b	284
	285	dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
	286	if (!dgst_raw)
22138a36	287	fatal("key_fingerprint: null from key_fingerprint_raw()");
301e8e5b	288	switch(dgst_rep) {
	289	case SSH_FP_HEX:
	290	retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
	291	break;
	292	case SSH_FP_BUBBLEBABBLE:
	293	retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
	294	break;
	295	default:
	296	fatal("key_fingerprint_ex: bad digest representation %d",
	297	dgst_rep);
	298	break;
	299	}
	300	memset(dgst_raw, 0, dgst_raw_len);
	301	xfree(dgst_raw);
	302	return retval;
	303	}
	304
4fe2af09	305	/*
	306	* Reads a multiple-precision integer in decimal from the buffer, and advances
	307	* the pointer. The integer must already be initialized. This function is
	308	* permitted to modify the buffer. This leaves *cpp to point just beyond the
	309	* last processed (and maybe modified) character. Note that this may modify
	310	* the buffer containing the number.
	311	*/
396c147e	312	static int
4fe2af09	313	read_bignum(char *cpp, BIGNUM value)
	314	{
	315	char cp = cpp;
	316	int old;
	317
	318	/* Skip any leading whitespace. */
	319	for (; cp == ' ' \|\| cp == '\t'; cp++)
	320	;
	321
	322	/* Check that it begins with a decimal digit. */
	323	if (cp < '0' \|\| cp > '9')
	324	return 0;
	325
	326	/* Save starting position. */
	327	*cpp = cp;
	328
	329	/* Move forward until all decimal digits skipped. */
	330	for (; cp >= '0' && cp <= '9'; cp++)
	331	;
	332
	333	/* Save the old terminating character, and replace it by \0. */
	334	old = *cp;
	335	*cp = 0;
	336
	337	/* Parse the number. */
	338	if (BN_dec2bn(&value, *cpp) == 0)
	339	return 0;
	340
	341	/* Restore old terminating character. */
	342	*cp = old;
	343
	344	/* Move beyond the number and return success. */
	345	*cpp = cp;
	346	return 1;
	347	}
396c147e	348	static int
4fe2af09	349	write_bignum(FILE f, BIGNUM num)
	350	{
	351	char *buf = BN_bn2dec(num);
	352	if (buf == NULL) {
	353	error("write_bignum: BN_bn2dec() failed");
	354	return 0;
	355	}
	356	fprintf(f, " %s", buf);
c48c32c1	357	OPENSSL_free(buf);
4fe2af09	358	return 1;
4fe2af09	359	}
fa08c86b	360
cb8c7bad	361	/* returns 1 ok, -1 error */
fa08c86b	362	int
a306f2dd	363	key_read(Key ret, char *cpp)
4fe2af09	364	{
a306f2dd	365	Key *k;
fa08c86b	366	int success = -1;
	367	char cp, space;
	368	int len, n, type;
	369	u_int bits;
1e3b8b07	370	u_char *blob;
a306f2dd	371
	372	cp = *cpp;
	373
4fe2af09	374	switch(ret->type) {
fa08c86b	375	case KEY_RSA1:
a306f2dd	376	/* Get number of bits. */
a306f2dd	377	if (cp < '0' \|\| cp > '9')
fa08c86b	378	return -1; /* Bad bit count... */
a306f2dd	379	for (bits = 0; cp >= '0' && cp <= '9'; cp++)
a306f2dd	380	bits = 10 * bits + *cp - '0';
4fe2af09	381	if (bits == 0)
fa08c86b	382	return -1;
a306f2dd	383	*cpp = cp;
4fe2af09	384	/* Get public exponent, public modulus. */
4fe2af09	385	if (!read_bignum(cpp, ret->rsa->e))
fa08c86b	386	return -1;
4fe2af09	387	if (!read_bignum(cpp, ret->rsa->n))
fa08c86b	388	return -1;
fa08c86b	389	success = 1;
4fe2af09	390	break;
fa08c86b	391	case KEY_UNSPEC:
fa08c86b	392	case KEY_RSA:
4fe2af09	393	case KEY_DSA:
fa08c86b	394	space = strchr(cp, ' ');
	395	if (space == NULL) {
	396	debug3("key_read: no space");
	397	return -1;
	398	}
	399	*space = '\0';
	400	type = key_type_from_name(cp);
	401	*space = ' ';
	402	if (type == KEY_UNSPEC) {
	403	debug3("key_read: no key found");
	404	return -1;
	405	}
	406	cp = space+1;
	407	if (*cp == '\0') {
	408	debug3("key_read: short string");
	409	return -1;
	410	}
	411	if (ret->type == KEY_UNSPEC) {
	412	ret->type = type;
	413	} else if (ret->type != type) {
	414	/* is a key, but different type */
	415	debug3("key_read: type mismatch");
cb8c7bad	416	return -1;
fa08c86b	417	}
a306f2dd	418	len = 2*strlen(cp);
	419	blob = xmalloc(len);
	420	n = uudecode(cp, blob, len);
1d1ffb87	421	if (n < 0) {
71276795	422	error("key_read: uudecode %s failed", cp);
fa08c86b	423	return -1;
1d1ffb87	424	}
fa08c86b	425	k = key_from_blob(blob, n);
71276795	426	if (k == NULL) {
fa08c86b	427	error("key_read: key_from_blob %s failed", cp);
fa08c86b	428	return -1;
71276795	429	}
a306f2dd	430	xfree(blob);
fa08c86b	431	if (k->type != type) {
	432	error("key_read: type mismatch: encoding error");
	433	key_free(k);
	434	return -1;
	435	}
	436	/XXXX/
	437	if (ret->type == KEY_RSA) {
	438	if (ret->rsa != NULL)
	439	RSA_free(ret->rsa);
	440	ret->rsa = k->rsa;
	441	k->rsa = NULL;
	442	success = 1;
	443	#ifdef DEBUG_PK
	444	RSA_print_fp(stderr, ret->rsa, 8);
	445	#endif
	446	} else {
	447	if (ret->dsa != NULL)
	448	DSA_free(ret->dsa);
	449	ret->dsa = k->dsa;
	450	k->dsa = NULL;
	451	success = 1;
	452	#ifdef DEBUG_PK
	453	DSA_print_fp(stderr, ret->dsa, 8);
	454	#endif
	455	}
	456	/XXXX/
	457	if (success != 1)
	458	break;
a306f2dd	459	key_free(k);
71276795	460	/* advance cp: skip whitespace and data */
	461	while (cp == ' ' \|\| cp == '\t')
	462	cp++;
	463	while (cp != '\0' && cp != ' ' && *cp != '\t')
	464	cp++;
	465	*cpp = cp;
4fe2af09	466	break;
4fe2af09	467	default:
a306f2dd	468	fatal("key_read: bad key type: %d", ret->type);
4fe2af09	469	break;
4fe2af09	470	}
fa08c86b	471	return success;
4fe2af09	472	}
	473	int
	474	key_write(Key key, FILE f)
	475	{
	476	int success = 0;
1e3b8b07	477	u_int bits = 0;
4fe2af09	478
fa08c86b	479	if (key->type == KEY_RSA1 && key->rsa != NULL) {
4fe2af09	480	/* size of modulus 'n' */
	481	bits = BN_num_bits(key->rsa->n);
	482	fprintf(f, "%u", bits);
	483	if (write_bignum(f, key->rsa->e) &&
	484	write_bignum(f, key->rsa->n)) {
	485	success = 1;
	486	} else {
	487	error("key_write: failed for RSA key");
	488	}
fa08c86b	489	} else if ((key->type == KEY_DSA && key->dsa != NULL) \|\|
fa08c86b	490	(key->type == KEY_RSA && key->rsa != NULL)) {
a306f2dd	491	int len, n;
1e3b8b07	492	u_char blob, uu;
fa08c86b	493	key_to_blob(key, &blob, &len);
a306f2dd	494	uu = xmalloc(2*len);
1d1ffb87	495	n = uuencode(blob, len, uu, 2*len);
1d1ffb87	496	if (n > 0) {
fa08c86b	497	fprintf(f, "%s %s", key_ssh_name(key), uu);
1d1ffb87	498	success = 1;
1d1ffb87	499	}
a306f2dd	500	xfree(blob);
a306f2dd	501	xfree(uu);
4fe2af09	502	}
	503	return success;
	504	}
1d1ffb87	505	char *
	506	key_type(Key *k)
	507	{
	508	switch (k->type) {
fa08c86b	509	case KEY_RSA1:
	510	return "RSA1";
	511	break;
1d1ffb87	512	case KEY_RSA:
	513	return "RSA";
	514	break;
	515	case KEY_DSA:
	516	return "DSA";
	517	break;
	518	}
	519	return "unknown";
	520	}
fa08c86b	521	char *
	522	key_ssh_name(Key *k)
	523	{
	524	switch (k->type) {
	525	case KEY_RSA:
	526	return "ssh-rsa";
	527	break;
	528	case KEY_DSA:
	529	return "ssh-dss";
	530	break;
	531	}
	532	return "ssh-unknown";
	533	}
	534	u_int
2e73a022	535	key_size(Key *k){
2e73a022	536	switch (k->type) {
fa08c86b	537	case KEY_RSA1:
2e73a022	538	case KEY_RSA:
	539	return BN_num_bits(k->rsa->n);
	540	break;
	541	case KEY_DSA:
	542	return BN_num_bits(k->dsa->p);
	543	break;
	544	}
	545	return 0;
	546	}
fa08c86b	547
396c147e	548	static RSA *
1e3b8b07	549	rsa_generate_private_key(u_int bits)
fa08c86b	550	{
2b87da3b	551	RSA *private;
	552	private = RSA_generate_key(bits, 35, NULL, NULL);
	553	if (private == NULL)
	554	fatal("rsa_generate_private_key: key generation failed.");
	555	return private;
fa08c86b	556	}
fa08c86b	557
396c147e	558	static DSA*
1e3b8b07	559	dsa_generate_private_key(u_int bits)
fa08c86b	560	{
	561	DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
	562	if (private == NULL)
	563	fatal("dsa_generate_private_key: DSA_generate_parameters failed");
	564	if (!DSA_generate_key(private))
2b87da3b	565	fatal("dsa_generate_private_key: DSA_generate_key failed.");
	566	if (private == NULL)
	567	fatal("dsa_generate_private_key: NULL.");
fa08c86b	568	return private;
	569	}
	570
	571	Key *
1e3b8b07	572	key_generate(int type, u_int bits)
fa08c86b	573	{
	574	Key *k = key_new(KEY_UNSPEC);
	575	switch (type) {
2b87da3b	576	case KEY_DSA:
fa08c86b	577	k->dsa = dsa_generate_private_key(bits);
	578	break;
	579	case KEY_RSA:
	580	case KEY_RSA1:
	581	k->rsa = rsa_generate_private_key(bits);
	582	break;
	583	default:
2b87da3b	584	fatal("key_generate: unknown type %d", type);
fa08c86b	585	}
2b87da3b	586	k->type = type;
fa08c86b	587	return k;
	588	}
	589
	590	Key *
	591	key_from_private(Key *k)
	592	{
	593	Key *n = NULL;
	594	switch (k->type) {
2b87da3b	595	case KEY_DSA:
fa08c86b	596	n = key_new(k->type);
	597	BN_copy(n->dsa->p, k->dsa->p);
	598	BN_copy(n->dsa->q, k->dsa->q);
	599	BN_copy(n->dsa->g, k->dsa->g);
	600	BN_copy(n->dsa->pub_key, k->dsa->pub_key);
	601	break;
	602	case KEY_RSA:
	603	case KEY_RSA1:
	604	n = key_new(k->type);
	605	BN_copy(n->rsa->n, k->rsa->n);
	606	BN_copy(n->rsa->e, k->rsa->e);
	607	break;
	608	default:
2b87da3b	609	fatal("key_from_private: unknown type %d", k->type);
fa08c86b	610	break;
	611	}
	612	return n;
	613	}
	614
	615	int
	616	key_type_from_name(char *name)
	617	{
	618	if (strcmp(name, "rsa1") == 0){
	619	return KEY_RSA1;
	620	} else if (strcmp(name, "rsa") == 0){
	621	return KEY_RSA;
	622	} else if (strcmp(name, "dsa") == 0){
	623	return KEY_DSA;
	624	} else if (strcmp(name, "ssh-rsa") == 0){
	625	return KEY_RSA;
	626	} else if (strcmp(name, "ssh-dss") == 0){
	627	return KEY_DSA;
	628	}
539af7f5	629	debug2("key_type_from_name: unknown key type '%s'", name);
fa08c86b	630	return KEY_UNSPEC;
	631	}
	632
e961a8f9	633	int
	634	key_names_valid2(const char *names)
	635	{
	636	char s, cp, *p;
	637
	638	if (names == NULL \|\| strcmp(names, "") == 0)
	639	return 0;
	640	s = cp = xstrdup(names);
	641	for ((p = strsep(&cp, ",")); p && *p != '\0';
	642	(p = strsep(&cp, ","))) {
	643	switch (key_type_from_name(p)) {
	644	case KEY_RSA1:
	645	case KEY_UNSPEC:
	646	xfree(s);
	647	return 0;
	648	}
	649	}
	650	debug3("key names ok: [%s]", names);
	651	xfree(s);
	652	return 1;
	653	}
	654
fa08c86b	655	Key *
cf54363d	656	key_from_blob(u_char *blob, int blen)
fa08c86b	657	{
	658	Buffer b;
	659	char *ktype;
	660	int rlen, type;
	661	Key *key = NULL;
	662
	663	#ifdef DEBUG_PK
	664	dump_base64(stderr, blob, blen);
	665	#endif
	666	buffer_init(&b);
	667	buffer_append(&b, blob, blen);
	668	ktype = buffer_get_string(&b, NULL);
	669	type = key_type_from_name(ktype);
	670
	671	switch(type){
	672	case KEY_RSA:
	673	key = key_new(type);
fa08c86b	674	buffer_get_bignum2(&b, key->rsa->e);
b5c334cc	675	buffer_get_bignum2(&b, key->rsa->n);
fa08c86b	676	#ifdef DEBUG_PK
	677	RSA_print_fp(stderr, key->rsa, 8);
	678	#endif
	679	break;
	680	case KEY_DSA:
	681	key = key_new(type);
	682	buffer_get_bignum2(&b, key->dsa->p);
	683	buffer_get_bignum2(&b, key->dsa->q);
	684	buffer_get_bignum2(&b, key->dsa->g);
	685	buffer_get_bignum2(&b, key->dsa->pub_key);
	686	#ifdef DEBUG_PK
	687	DSA_print_fp(stderr, key->dsa, 8);
	688	#endif
	689	break;
	690	case KEY_UNSPEC:
	691	key = key_new(type);
	692	break;
	693	default:
	694	error("key_from_blob: cannot handle type %s", ktype);
	695	break;
	696	}
	697	rlen = buffer_len(&b);
	698	if (key != NULL && rlen != 0)
	699	error("key_from_blob: remaining bytes in key blob %d", rlen);
	700	xfree(ktype);
	701	buffer_free(&b);
	702	return key;
	703	}
	704
	705	int
1e3b8b07	706	key_to_blob(Key key, u_char blobp, u_int lenp)
fa08c86b	707	{
	708	Buffer b;
	709	int len;
1e3b8b07	710	u_char *buf;
fa08c86b	711
	712	if (key == NULL) {
	713	error("key_to_blob: key == NULL");
	714	return 0;
	715	}
	716	buffer_init(&b);
	717	switch(key->type){
	718	case KEY_DSA:
	719	buffer_put_cstring(&b, key_ssh_name(key));
	720	buffer_put_bignum2(&b, key->dsa->p);
	721	buffer_put_bignum2(&b, key->dsa->q);
	722	buffer_put_bignum2(&b, key->dsa->g);
	723	buffer_put_bignum2(&b, key->dsa->pub_key);
	724	break;
	725	case KEY_RSA:
	726	buffer_put_cstring(&b, key_ssh_name(key));
fa08c86b	727	buffer_put_bignum2(&b, key->rsa->e);
b5c334cc	728	buffer_put_bignum2(&b, key->rsa->n);
fa08c86b	729	break;
fa08c86b	730	default:
f7436b8c	731	error("key_to_blob: unsupported key type %d", key->type);
	732	buffer_free(&b);
	733	return 0;
fa08c86b	734	}
	735	len = buffer_len(&b);
	736	buf = xmalloc(len);
	737	memcpy(buf, buffer_ptr(&b), len);
	738	memset(buffer_ptr(&b), 0, len);
	739	buffer_free(&b);
	740	if (lenp != NULL)
	741	*lenp = len;
	742	if (blobp != NULL)
	743	*blobp = buf;
	744	return len;
	745	}
	746
	747	int
	748	key_sign(
	749	Key *key,
1e3b8b07	750	u_char *sigp, int lenp,
1e3b8b07	751	u_char *data, int datalen)
fa08c86b	752	{
	753	switch(key->type){
	754	case KEY_DSA:
	755	return ssh_dss_sign(key, sigp, lenp, data, datalen);
	756	break;
	757	case KEY_RSA:
	758	return ssh_rsa_sign(key, sigp, lenp, data, datalen);
	759	break;
	760	default:
	761	error("key_sign: illegal key type %d", key->type);
	762	return -1;
	763	break;
	764	}
	765	}
	766
	767	int
	768	key_verify(
	769	Key *key,
1e3b8b07	770	u_char *signature, int signaturelen,
1e3b8b07	771	u_char *data, int datalen)
fa08c86b	772	{
c10d042a	773	if (signaturelen == 0)
	774	return -1;
	775
fa08c86b	776	switch(key->type){
	777	case KEY_DSA:
	778	return ssh_dss_verify(key, signature, signaturelen, data, datalen);
	779	break;
	780	case KEY_RSA:
	781	return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
	782	break;
	783	default:
	784	error("key_verify: illegal key type %d", key->type);
	785	return -1;
	786	break;
	787	}
	788	}