[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 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 1.26 2001/06/23 05:26:02 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->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;
}

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;
}

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;
}

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.
 */
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;
}
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);
	xfree(buf);
	return 1;
}

/* returns 1 ok, -1 error, 0 type mismatch */
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 0;
		}
		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;
}

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;
}

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(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: illegal key type %d", key->type);
		break;
	}
	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	*
4fe2af09	12	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	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"
c10d042a	35	RCSID("$OpenBSD: key.c,v 1.26 2001/06/23 05:26:02 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;
a306f2dd	57	k->dsa = NULL;
a306f2dd	58	k->rsa = NULL;
4fe2af09	59	switch (k->type) {
fa08c86b	60	case KEY_RSA1:
4fe2af09	61	case KEY_RSA:
	62	rsa = RSA_new();
	63	rsa->n = BN_new();
	64	rsa->e = BN_new();
	65	k->rsa = rsa;
	66	break;
	67	case KEY_DSA:
	68	dsa = DSA_new();
	69	dsa->p = BN_new();
	70	dsa->q = BN_new();
	71	dsa->g = BN_new();
	72	dsa->pub_key = BN_new();
	73	k->dsa = dsa;
	74	break;
fa08c86b	75	case KEY_UNSPEC:
4fe2af09	76	break;
	77	default:
	78	fatal("key_new: bad key type %d", k->type);
	79	break;
	80	}
	81	return k;
	82	}
fa08c86b	83	Key *
	84	key_new_private(int type)
	85	{
	86	Key *k = key_new(type);
	87	switch (k->type) {
	88	case KEY_RSA1:
	89	case KEY_RSA:
	90	k->rsa->d = BN_new();
	91	k->rsa->iqmp = BN_new();
	92	k->rsa->q = BN_new();
	93	k->rsa->p = BN_new();
	94	k->rsa->dmq1 = BN_new();
	95	k->rsa->dmp1 = BN_new();
	96	break;
	97	case KEY_DSA:
	98	k->dsa->priv_key = BN_new();
	99	break;
	100	case KEY_UNSPEC:
	101	break;
	102	default:
	103	break;
	104	}
	105	return k;
	106	}
4fe2af09	107	void
	108	key_free(Key *k)
	109	{
	110	switch (k->type) {
fa08c86b	111	case KEY_RSA1:
4fe2af09	112	case KEY_RSA:
	113	if (k->rsa != NULL)
	114	RSA_free(k->rsa);
	115	k->rsa = NULL;
	116	break;
	117	case KEY_DSA:
	118	if (k->dsa != NULL)
	119	DSA_free(k->dsa);
	120	k->dsa = NULL;
	121	break;
fa08c86b	122	case KEY_UNSPEC:
fa08c86b	123	break;
4fe2af09	124	default:
	125	fatal("key_free: bad key type %d", k->type);
	126	break;
	127	}
	128	xfree(k);
	129	}
	130	int
	131	key_equal(Key a, Key b)
	132	{
	133	if (a == NULL \|\| b == NULL \|\| a->type != b->type)
	134	return 0;
	135	switch (a->type) {
fa08c86b	136	case KEY_RSA1:
4fe2af09	137	case KEY_RSA:
	138	return a->rsa != NULL && b->rsa != NULL &&
	139	BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
	140	BN_cmp(a->rsa->n, b->rsa->n) == 0;
	141	break;
	142	case KEY_DSA:
	143	return a->dsa != NULL && b->dsa != NULL &&
	144	BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
	145	BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
	146	BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
	147	BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
	148	break;
	149	default:
a306f2dd	150	fatal("key_equal: bad key type %d", a->type);
4fe2af09	151	break;
	152	}
	153	return 0;
	154	}
	155
301e8e5b	156	u_char*
301e8e5b	157	key_fingerprint_raw(Key k, enum fp_type dgst_type, size_t dgst_raw_length)
4fe2af09	158	{
79c9ac1b	159	EVP_MD *md = NULL;
79c9ac1b	160	EVP_MD_CTX ctx;
1e3b8b07	161	u_char *blob = NULL;
301e8e5b	162	u_char *retval = NULL;
4fe2af09	163	int len = 0;
a306f2dd	164	int nlen, elen;
4fe2af09	165
301e8e5b	166	*dgst_raw_length = 0;
301e8e5b	167
79c9ac1b	168	switch (dgst_type) {
	169	case SSH_FP_MD5:
	170	md = EVP_md5();
	171	break;
	172	case SSH_FP_SHA1:
	173	md = EVP_sha1();
	174	break;
	175	default:
	176	fatal("key_fingerprint_raw: bad digest type %d",
	177	dgst_type);
	178	}
4fe2af09	179	switch (k->type) {
fa08c86b	180	case KEY_RSA1:
4fe2af09	181	nlen = BN_num_bytes(k->rsa->n);
	182	elen = BN_num_bytes(k->rsa->e);
	183	len = nlen + elen;
a306f2dd	184	blob = xmalloc(len);
	185	BN_bn2bin(k->rsa->n, blob);
	186	BN_bn2bin(k->rsa->e, blob + nlen);
4fe2af09	187	break;
4fe2af09	188	case KEY_DSA:
fa08c86b	189	case KEY_RSA:
	190	key_to_blob(k, &blob, &len);
	191	break;
	192	case KEY_UNSPEC:
	193	return retval;
4fe2af09	194	break;
4fe2af09	195	default:
301e8e5b	196	fatal("key_fingerprint_raw: bad key type %d", k->type);
4fe2af09	197	break;
4fe2af09	198	}
a306f2dd	199	if (blob != NULL) {
301e8e5b	200	retval = xmalloc(EVP_MAX_MD_SIZE);
74fc9186	201	EVP_DigestInit(&ctx, md);
74fc9186	202	EVP_DigestUpdate(&ctx, blob, len);
301e8e5b	203	EVP_DigestFinal(&ctx, retval, NULL);
301e8e5b	204	*dgst_raw_length = md->md_size;
a306f2dd	205	memset(blob, 0, len);
a306f2dd	206	xfree(blob);
301e8e5b	207	} else {
301e8e5b	208	fatal("key_fingerprint_raw: blob is null");
4fe2af09	209	}
	210	return retval;
	211	}
	212
301e8e5b	213	char*
cd332296	214	key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
301e8e5b	215	{
	216	char *retval;
	217	int i;
	218
a88b7b57	219	retval = xmalloc(dgst_raw_len * 3 + 1);
301e8e5b	220	retval[0] = '\0';
	221	for(i = 0; i < dgst_raw_len; i++) {
	222	char hex[4];
	223	snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
	224	strlcat(retval, hex, dgst_raw_len * 3);
	225	}
	226	retval[(dgst_raw_len * 3) - 1] = '\0';
	227	return retval;
	228	}
	229
	230	char*
cd332296	231	key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
301e8e5b	232	{
	233	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
	234	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
	235	'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
08345971	236	u_int i, j = 0, rounds, seed = 1;
301e8e5b	237	char *retval;
	238
	239	rounds = (dgst_raw_len / 2) + 1;
	240	retval = xmalloc(sizeof(char) * (rounds*6));
08345971	241	retval[j++] = 'x';
08345971	242	for (i = 0; i < rounds; i++) {
301e8e5b	243	u_int idx0, idx1, idx2, idx3, idx4;
08345971	244	if ((i + 1 < rounds) \|\| (dgst_raw_len % 2 != 0)) {
08345971	245	idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
301e8e5b	246	seed) % 6;
08345971	247	idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
08345971	248	idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
301e8e5b	249	(seed / 6)) % 6;
08345971	250	retval[j++] = vowels[idx0];
	251	retval[j++] = consonants[idx1];
	252	retval[j++] = vowels[idx2];
	253	if ((i + 1) < rounds) {
	254	idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
	255	idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
	256	retval[j++] = consonants[idx3];
	257	retval[j++] = '-';
	258	retval[j++] = consonants[idx4];
301e8e5b	259	seed = ((seed * 5) +
08345971	260	((((u_int)(dgst_raw[2 * i])) * 7) +
08345971	261	((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
301e8e5b	262	}
	263	} else {
	264	idx0 = seed % 6;
	265	idx1 = 16;
	266	idx2 = seed / 6;
08345971	267	retval[j++] = vowels[idx0];
	268	retval[j++] = consonants[idx1];
	269	retval[j++] = vowels[idx2];
301e8e5b	270	}
301e8e5b	271	}
08345971	272	retval[j++] = 'x';
08345971	273	retval[j++] = '\0';
301e8e5b	274	return retval;
	275	}
	276
	277	char*
22138a36	278	key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
301e8e5b	279	{
cd332296	280	char *retval = NULL;
301e8e5b	281	u_char *dgst_raw;
cd332296	282	size_t dgst_raw_len;
301e8e5b	283
	284	dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
	285	if (!dgst_raw)
22138a36	286	fatal("key_fingerprint: null from key_fingerprint_raw()");
301e8e5b	287	switch(dgst_rep) {
	288	case SSH_FP_HEX:
	289	retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
	290	break;
	291	case SSH_FP_BUBBLEBABBLE:
	292	retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
	293	break;
	294	default:
	295	fatal("key_fingerprint_ex: bad digest representation %d",
	296	dgst_rep);
	297	break;
	298	}
	299	memset(dgst_raw, 0, dgst_raw_len);
	300	xfree(dgst_raw);
	301	return retval;
	302	}
	303
4fe2af09	304	/*
	305	* Reads a multiple-precision integer in decimal from the buffer, and advances
	306	* the pointer. The integer must already be initialized. This function is
	307	* permitted to modify the buffer. This leaves *cpp to point just beyond the
	308	* last processed (and maybe modified) character. Note that this may modify
	309	* the buffer containing the number.
	310	*/
	311	int
	312	read_bignum(char *cpp, BIGNUM value)
	313	{
	314	char cp = cpp;
	315	int old;
	316
	317	/* Skip any leading whitespace. */
	318	for (; cp == ' ' \|\| cp == '\t'; cp++)
	319	;
	320
	321	/* Check that it begins with a decimal digit. */
	322	if (cp < '0' \|\| cp > '9')
	323	return 0;
	324
	325	/* Save starting position. */
	326	*cpp = cp;
	327
	328	/* Move forward until all decimal digits skipped. */
	329	for (; cp >= '0' && cp <= '9'; cp++)
	330	;
	331
	332	/* Save the old terminating character, and replace it by \0. */
	333	old = *cp;
	334	*cp = 0;
	335
	336	/* Parse the number. */
	337	if (BN_dec2bn(&value, *cpp) == 0)
	338	return 0;
	339
	340	/* Restore old terminating character. */
	341	*cp = old;
	342
	343	/* Move beyond the number and return success. */
	344	*cpp = cp;
	345	return 1;
	346	}
	347	int
	348	write_bignum(FILE f, BIGNUM num)
	349	{
	350	char *buf = BN_bn2dec(num);
	351	if (buf == NULL) {
	352	error("write_bignum: BN_bn2dec() failed");
	353	return 0;
	354	}
	355	fprintf(f, " %s", buf);
53a24016	356	xfree(buf);
4fe2af09	357	return 1;
4fe2af09	358	}
fa08c86b	359
	360	/* returns 1 ok, -1 error, 0 type mismatch */
	361	int
a306f2dd	362	key_read(Key ret, char *cpp)
4fe2af09	363	{
a306f2dd	364	Key *k;
fa08c86b	365	int success = -1;
	366	char cp, space;
	367	int len, n, type;
	368	u_int bits;
1e3b8b07	369	u_char *blob;
a306f2dd	370
	371	cp = *cpp;
	372
4fe2af09	373	switch(ret->type) {
fa08c86b	374	case KEY_RSA1:
a306f2dd	375	/* Get number of bits. */
a306f2dd	376	if (cp < '0' \|\| cp > '9')
fa08c86b	377	return -1; /* Bad bit count... */
a306f2dd	378	for (bits = 0; cp >= '0' && cp <= '9'; cp++)
a306f2dd	379	bits = 10 * bits + *cp - '0';
4fe2af09	380	if (bits == 0)
fa08c86b	381	return -1;
a306f2dd	382	*cpp = cp;
4fe2af09	383	/* Get public exponent, public modulus. */
4fe2af09	384	if (!read_bignum(cpp, ret->rsa->e))
fa08c86b	385	return -1;
4fe2af09	386	if (!read_bignum(cpp, ret->rsa->n))
fa08c86b	387	return -1;
fa08c86b	388	success = 1;
4fe2af09	389	break;
fa08c86b	390	case KEY_UNSPEC:
fa08c86b	391	case KEY_RSA:
4fe2af09	392	case KEY_DSA:
fa08c86b	393	space = strchr(cp, ' ');
	394	if (space == NULL) {
	395	debug3("key_read: no space");
	396	return -1;
	397	}
	398	*space = '\0';
	399	type = key_type_from_name(cp);
	400	*space = ' ';
	401	if (type == KEY_UNSPEC) {
	402	debug3("key_read: no key found");
	403	return -1;
	404	}
	405	cp = space+1;
	406	if (*cp == '\0') {
	407	debug3("key_read: short string");
	408	return -1;
	409	}
	410	if (ret->type == KEY_UNSPEC) {
	411	ret->type = type;
	412	} else if (ret->type != type) {
	413	/* is a key, but different type */
	414	debug3("key_read: type mismatch");
4fe2af09	415	return 0;
fa08c86b	416	}
a306f2dd	417	len = 2*strlen(cp);
	418	blob = xmalloc(len);
	419	n = uudecode(cp, blob, len);
1d1ffb87	420	if (n < 0) {
71276795	421	error("key_read: uudecode %s failed", cp);
fa08c86b	422	return -1;
1d1ffb87	423	}
fa08c86b	424	k = key_from_blob(blob, n);
71276795	425	if (k == NULL) {
fa08c86b	426	error("key_read: key_from_blob %s failed", cp);
fa08c86b	427	return -1;
71276795	428	}
a306f2dd	429	xfree(blob);
fa08c86b	430	if (k->type != type) {
	431	error("key_read: type mismatch: encoding error");
	432	key_free(k);
	433	return -1;
	434	}
	435	/XXXX/
	436	if (ret->type == KEY_RSA) {
	437	if (ret->rsa != NULL)
	438	RSA_free(ret->rsa);
	439	ret->rsa = k->rsa;
	440	k->rsa = NULL;
	441	success = 1;
	442	#ifdef DEBUG_PK
	443	RSA_print_fp(stderr, ret->rsa, 8);
	444	#endif
	445	} else {
	446	if (ret->dsa != NULL)
	447	DSA_free(ret->dsa);
	448	ret->dsa = k->dsa;
	449	k->dsa = NULL;
	450	success = 1;
	451	#ifdef DEBUG_PK
	452	DSA_print_fp(stderr, ret->dsa, 8);
	453	#endif
	454	}
	455	/XXXX/
	456	if (success != 1)
	457	break;
a306f2dd	458	key_free(k);
71276795	459	/* advance cp: skip whitespace and data */
	460	while (cp == ' ' \|\| cp == '\t')
	461	cp++;
	462	while (cp != '\0' && cp != ' ' && *cp != '\t')
	463	cp++;
	464	*cpp = cp;
4fe2af09	465	break;
4fe2af09	466	default:
a306f2dd	467	fatal("key_read: bad key type: %d", ret->type);
4fe2af09	468	break;
4fe2af09	469	}
fa08c86b	470	return success;
4fe2af09	471	}
	472	int
	473	key_write(Key key, FILE f)
	474	{
	475	int success = 0;
1e3b8b07	476	u_int bits = 0;
4fe2af09	477
fa08c86b	478	if (key->type == KEY_RSA1 && key->rsa != NULL) {
4fe2af09	479	/* size of modulus 'n' */
	480	bits = BN_num_bits(key->rsa->n);
	481	fprintf(f, "%u", bits);
	482	if (write_bignum(f, key->rsa->e) &&
	483	write_bignum(f, key->rsa->n)) {
	484	success = 1;
	485	} else {
	486	error("key_write: failed for RSA key");
	487	}
fa08c86b	488	} else if ((key->type == KEY_DSA && key->dsa != NULL) \|\|
fa08c86b	489	(key->type == KEY_RSA && key->rsa != NULL)) {
a306f2dd	490	int len, n;
1e3b8b07	491	u_char blob, uu;
fa08c86b	492	key_to_blob(key, &blob, &len);
a306f2dd	493	uu = xmalloc(2*len);
1d1ffb87	494	n = uuencode(blob, len, uu, 2*len);
1d1ffb87	495	if (n > 0) {
fa08c86b	496	fprintf(f, "%s %s", key_ssh_name(key), uu);
1d1ffb87	497	success = 1;
1d1ffb87	498	}
a306f2dd	499	xfree(blob);
a306f2dd	500	xfree(uu);
4fe2af09	501	}
	502	return success;
	503	}
1d1ffb87	504	char *
	505	key_type(Key *k)
	506	{
	507	switch (k->type) {
fa08c86b	508	case KEY_RSA1:
	509	return "RSA1";
	510	break;
1d1ffb87	511	case KEY_RSA:
	512	return "RSA";
	513	break;
	514	case KEY_DSA:
	515	return "DSA";
	516	break;
	517	}
	518	return "unknown";
	519	}
fa08c86b	520	char *
	521	key_ssh_name(Key *k)
	522	{
	523	switch (k->type) {
	524	case KEY_RSA:
	525	return "ssh-rsa";
	526	break;
	527	case KEY_DSA:
	528	return "ssh-dss";
	529	break;
	530	}
	531	return "ssh-unknown";
	532	}
	533	u_int
2e73a022	534	key_size(Key *k){
2e73a022	535	switch (k->type) {
fa08c86b	536	case KEY_RSA1:
2e73a022	537	case KEY_RSA:
	538	return BN_num_bits(k->rsa->n);
	539	break;
	540	case KEY_DSA:
	541	return BN_num_bits(k->dsa->p);
	542	break;
	543	}
	544	return 0;
	545	}
fa08c86b	546
fa08c86b	547	RSA *
1e3b8b07	548	rsa_generate_private_key(u_int bits)
fa08c86b	549	{
2b87da3b	550	RSA *private;
	551	private = RSA_generate_key(bits, 35, NULL, NULL);
	552	if (private == NULL)
	553	fatal("rsa_generate_private_key: key generation failed.");
	554	return private;
fa08c86b	555	}
	556
	557	DSA*
1e3b8b07	558	dsa_generate_private_key(u_int bits)
fa08c86b	559	{
	560	DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
	561	if (private == NULL)
	562	fatal("dsa_generate_private_key: DSA_generate_parameters failed");
	563	if (!DSA_generate_key(private))
2b87da3b	564	fatal("dsa_generate_private_key: DSA_generate_key failed.");
	565	if (private == NULL)
	566	fatal("dsa_generate_private_key: NULL.");
fa08c86b	567	return private;
	568	}
	569
	570	Key *
1e3b8b07	571	key_generate(int type, u_int bits)
fa08c86b	572	{
	573	Key *k = key_new(KEY_UNSPEC);
	574	switch (type) {
2b87da3b	575	case KEY_DSA:
fa08c86b	576	k->dsa = dsa_generate_private_key(bits);
	577	break;
	578	case KEY_RSA:
	579	case KEY_RSA1:
	580	k->rsa = rsa_generate_private_key(bits);
	581	break;
	582	default:
2b87da3b	583	fatal("key_generate: unknown type %d", type);
fa08c86b	584	}
2b87da3b	585	k->type = type;
fa08c86b	586	return k;
	587	}
	588
	589	Key *
	590	key_from_private(Key *k)
	591	{
	592	Key *n = NULL;
	593	switch (k->type) {
2b87da3b	594	case KEY_DSA:
fa08c86b	595	n = key_new(k->type);
	596	BN_copy(n->dsa->p, k->dsa->p);
	597	BN_copy(n->dsa->q, k->dsa->q);
	598	BN_copy(n->dsa->g, k->dsa->g);
	599	BN_copy(n->dsa->pub_key, k->dsa->pub_key);
	600	break;
	601	case KEY_RSA:
	602	case KEY_RSA1:
	603	n = key_new(k->type);
	604	BN_copy(n->rsa->n, k->rsa->n);
	605	BN_copy(n->rsa->e, k->rsa->e);
	606	break;
	607	default:
2b87da3b	608	fatal("key_from_private: unknown type %d", k->type);
fa08c86b	609	break;
	610	}
	611	return n;
	612	}
	613
	614	int
	615	key_type_from_name(char *name)
	616	{
	617	if (strcmp(name, "rsa1") == 0){
	618	return KEY_RSA1;
	619	} else if (strcmp(name, "rsa") == 0){
	620	return KEY_RSA;
	621	} else if (strcmp(name, "dsa") == 0){
	622	return KEY_DSA;
	623	} else if (strcmp(name, "ssh-rsa") == 0){
	624	return KEY_RSA;
	625	} else if (strcmp(name, "ssh-dss") == 0){
	626	return KEY_DSA;
	627	}
539af7f5	628	debug2("key_type_from_name: unknown key type '%s'", name);
fa08c86b	629	return KEY_UNSPEC;
	630	}
	631
e961a8f9	632	int
	633	key_names_valid2(const char *names)
	634	{
	635	char s, cp, *p;
	636
	637	if (names == NULL \|\| strcmp(names, "") == 0)
	638	return 0;
	639	s = cp = xstrdup(names);
	640	for ((p = strsep(&cp, ",")); p && *p != '\0';
	641	(p = strsep(&cp, ","))) {
	642	switch (key_type_from_name(p)) {
	643	case KEY_RSA1:
	644	case KEY_UNSPEC:
	645	xfree(s);
	646	return 0;
	647	}
	648	}
	649	debug3("key names ok: [%s]", names);
	650	xfree(s);
	651	return 1;
	652	}
	653
fa08c86b	654	Key *
	655	key_from_blob(char *blob, int blen)
	656	{
	657	Buffer b;
	658	char *ktype;
	659	int rlen, type;
	660	Key *key = NULL;
	661
	662	#ifdef DEBUG_PK
	663	dump_base64(stderr, blob, blen);
	664	#endif
	665	buffer_init(&b);
	666	buffer_append(&b, blob, blen);
	667	ktype = buffer_get_string(&b, NULL);
	668	type = key_type_from_name(ktype);
	669
	670	switch(type){
	671	case KEY_RSA:
	672	key = key_new(type);
fa08c86b	673	buffer_get_bignum2(&b, key->rsa->e);
b5c334cc	674	buffer_get_bignum2(&b, key->rsa->n);
fa08c86b	675	#ifdef DEBUG_PK
	676	RSA_print_fp(stderr, key->rsa, 8);
	677	#endif
	678	break;
	679	case KEY_DSA:
	680	key = key_new(type);
	681	buffer_get_bignum2(&b, key->dsa->p);
	682	buffer_get_bignum2(&b, key->dsa->q);
	683	buffer_get_bignum2(&b, key->dsa->g);
	684	buffer_get_bignum2(&b, key->dsa->pub_key);
	685	#ifdef DEBUG_PK
	686	DSA_print_fp(stderr, key->dsa, 8);
	687	#endif
	688	break;
	689	case KEY_UNSPEC:
	690	key = key_new(type);
	691	break;
	692	default:
	693	error("key_from_blob: cannot handle type %s", ktype);
	694	break;
	695	}
	696	rlen = buffer_len(&b);
	697	if (key != NULL && rlen != 0)
	698	error("key_from_blob: remaining bytes in key blob %d", rlen);
	699	xfree(ktype);
	700	buffer_free(&b);
	701	return key;
	702	}
	703
	704	int
1e3b8b07	705	key_to_blob(Key key, u_char blobp, u_int lenp)
fa08c86b	706	{
	707	Buffer b;
	708	int len;
1e3b8b07	709	u_char *buf;
fa08c86b	710
	711	if (key == NULL) {
	712	error("key_to_blob: key == NULL");
	713	return 0;
	714	}
	715	buffer_init(&b);
	716	switch(key->type){
	717	case KEY_DSA:
	718	buffer_put_cstring(&b, key_ssh_name(key));
	719	buffer_put_bignum2(&b, key->dsa->p);
	720	buffer_put_bignum2(&b, key->dsa->q);
	721	buffer_put_bignum2(&b, key->dsa->g);
	722	buffer_put_bignum2(&b, key->dsa->pub_key);
	723	break;
	724	case KEY_RSA:
	725	buffer_put_cstring(&b, key_ssh_name(key));
fa08c86b	726	buffer_put_bignum2(&b, key->rsa->e);
b5c334cc	727	buffer_put_bignum2(&b, key->rsa->n);
fa08c86b	728	break;
	729	default:
	730	error("key_to_blob: illegal key type %d", key->type);
	731	break;
	732	}
	733	len = buffer_len(&b);
	734	buf = xmalloc(len);
	735	memcpy(buf, buffer_ptr(&b), len);
	736	memset(buffer_ptr(&b), 0, len);
	737	buffer_free(&b);
	738	if (lenp != NULL)
	739	*lenp = len;
	740	if (blobp != NULL)
	741	*blobp = buf;
	742	return len;
	743	}
	744
	745	int
	746	key_sign(
	747	Key *key,
1e3b8b07	748	u_char *sigp, int lenp,
1e3b8b07	749	u_char *data, int datalen)
fa08c86b	750	{
	751	switch(key->type){
	752	case KEY_DSA:
	753	return ssh_dss_sign(key, sigp, lenp, data, datalen);
	754	break;
	755	case KEY_RSA:
	756	return ssh_rsa_sign(key, sigp, lenp, data, datalen);
	757	break;
	758	default:
	759	error("key_sign: illegal key type %d", key->type);
	760	return -1;
	761	break;
	762	}
	763	}
	764
	765	int
	766	key_verify(
	767	Key *key,
1e3b8b07	768	u_char *signature, int signaturelen,
1e3b8b07	769	u_char *data, int datalen)
fa08c86b	770	{
c10d042a	771	if (signaturelen == 0)
	772	return -1;
	773
fa08c86b	774	switch(key->type){
	775	case KEY_DSA:
	776	return ssh_dss_verify(key, signature, signaturelen, data, datalen);
	777	break;
	778	case KEY_RSA:
	779	return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
	780	break;
	781	default:
	782	error("key_verify: illegal key type %d", key->type);
	783	return -1;
	784	break;
	785	}
	786	}