[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 1.19 2001/03/11 15:03:15 jakob 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)
{
	u_char *blob = NULL;
	u_char *retval = NULL;
	int len = 0;
	int nlen, elen;

	*dgst_raw_length = 0;

	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) {
		EVP_MD *md = NULL;
		EVP_MD_CTX ctx;

		retval = xmalloc(EVP_MAX_MD_SIZE);

		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);
		}

		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);
	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 rounds, idx, retval_idx, seed;
	char *retval;

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

char*
key_fingerprint_ex(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_ex: null value returned 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;
}

char *
key_fingerprint(Key *k)
{
	static char retval[(EVP_MAX_MD_SIZE + 1) * 3];
	char *digest;

	digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX);
	strlcpy(retval, digest, sizeof(retval));
	xfree(digest);
	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;
}

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)
{
	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"
301e8e5b	35	RCSID("$OpenBSD: key.c,v 1.19 2001/03/11 15:03:15 jakob 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	{
1e3b8b07	159	u_char *blob = NULL;
301e8e5b	160	u_char *retval = NULL;
4fe2af09	161	int len = 0;
a306f2dd	162	int nlen, elen;
4fe2af09	163
301e8e5b	164	*dgst_raw_length = 0;
301e8e5b	165
4fe2af09	166	switch (k->type) {
fa08c86b	167	case KEY_RSA1:
4fe2af09	168	nlen = BN_num_bytes(k->rsa->n);
	169	elen = BN_num_bytes(k->rsa->e);
	170	len = nlen + elen;
a306f2dd	171	blob = xmalloc(len);
	172	BN_bn2bin(k->rsa->n, blob);
	173	BN_bn2bin(k->rsa->e, blob + nlen);
4fe2af09	174	break;
4fe2af09	175	case KEY_DSA:
fa08c86b	176	case KEY_RSA:
	177	key_to_blob(k, &blob, &len);
	178	break;
	179	case KEY_UNSPEC:
	180	return retval;
4fe2af09	181	break;
4fe2af09	182	default:
301e8e5b	183	fatal("key_fingerprint_raw: bad key type %d", k->type);
4fe2af09	184	break;
4fe2af09	185	}
a306f2dd	186	if (blob != NULL) {
301e8e5b	187	EVP_MD *md = NULL;
74fc9186	188	EVP_MD_CTX ctx;
301e8e5b	189
	190	retval = xmalloc(EVP_MAX_MD_SIZE);
	191
	192	switch (dgst_type) {
	193	case SSH_FP_MD5:
	194	md = EVP_md5();
	195	break;
	196	case SSH_FP_SHA1:
	197	md = EVP_sha1();
	198	break;
	199	default:
	200	fatal("key_fingerprint_raw: bad digest type %d",
	201	dgst_type);
	202	}
	203
74fc9186	204	EVP_DigestInit(&ctx, md);
74fc9186	205	EVP_DigestUpdate(&ctx, blob, len);
301e8e5b	206	EVP_DigestFinal(&ctx, retval, NULL);
301e8e5b	207	*dgst_raw_length = md->md_size;
a306f2dd	208	memset(blob, 0, len);
a306f2dd	209	xfree(blob);
301e8e5b	210	} else {
301e8e5b	211	fatal("key_fingerprint_raw: blob is null");
4fe2af09	212	}
	213	return retval;
	214	}
	215
301e8e5b	216	char*
	217	key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
	218	{
	219	char *retval;
	220	int i;
	221
	222	retval = xmalloc(dgst_raw_len * 3);
	223	retval[0] = '\0';
	224	for(i = 0; i < dgst_raw_len; i++) {
	225	char hex[4];
	226	snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
	227	strlcat(retval, hex, dgst_raw_len * 3);
	228	}
	229	retval[(dgst_raw_len * 3) - 1] = '\0';
	230	return retval;
	231	}
	232
	233	char*
	234	key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
	235	{
	236	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
	237	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
	238	'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
	239	u_int rounds, idx, retval_idx, seed;
	240	char *retval;
	241
	242	rounds = (dgst_raw_len / 2) + 1;
	243	retval = xmalloc(sizeof(char) * (rounds*6));
	244	seed = 1;
	245	retval_idx = 0;
	246	retval[retval_idx++] = 'x';
	247	for (idx=0;idx<rounds;idx++) {
	248	u_int idx0, idx1, idx2, idx3, idx4;
	249	if ((idx + 1 < rounds) \|\| (dgst_raw_len % 2 != 0)) {
	250	idx0 = (((((u_int)(dgst_raw[2 * idx])) >> 6) & 3) +
	251	seed) % 6;
	252	idx1 = (((u_int)(dgst_raw[2 * idx])) >> 2) & 15;
	253	idx2 = ((((u_int)(dgst_raw[2 * idx])) & 3) +
	254	(seed / 6)) % 6;
	255	retval[retval_idx++] = vowels[idx0];
	256	retval[retval_idx++] = consonants[idx1];
	257	retval[retval_idx++] = vowels[idx2];
	258	if ((idx + 1) < rounds) {
	259	idx3 = (((u_int)(dgst_raw[(2 * idx) + 1])) >> 4) & 15;
	260	idx4 = (((u_int)(dgst_raw[(2 * idx) + 1]))) & 15;
	261	retval[retval_idx++] = consonants[idx3];
	262	retval[retval_idx++] = '-';
	263	retval[retval_idx++] = consonants[idx4];
	264	seed = ((seed * 5) +
	265	((((u_int)(dgst_raw[2 * idx])) * 7) +
	266	((u_int)(dgst_raw[(2 * idx) + 1])))) % 36;
	267	}
	268	} else {
	269	idx0 = seed % 6;
	270	idx1 = 16;
	271	idx2 = seed / 6;
	272	retval[retval_idx++] = vowels[idx0];
	273	retval[retval_idx++] = consonants[idx1];
	274	retval[retval_idx++] = vowels[idx2];
	275	}
	276	}
	277	retval[retval_idx++] = 'x';
	278	retval[retval_idx++] = '\0';
	279	return retval;
280	}
281
282	char*
283	key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
284	{
285	char *retval = NULL;
286	u_char *dgst_raw;
287	size_t dgst_raw_len;
288
289	dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
290	if (!dgst_raw)
291	fatal("key_fingerprint_ex: null value returned from key_fingerprint_raw()");
292	switch(dgst_rep) {
293	case SSH_FP_HEX:
294	retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
295	break;
296	case SSH_FP_BUBBLEBABBLE:
297	retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
298	break;
299	default:
300	fatal("key_fingerprint_ex: bad digest representation %d",
301	dgst_rep);
302	break;
303	}
304	memset(dgst_raw, 0, dgst_raw_len);
305	xfree(dgst_raw);
306	return retval;
307	}
308
309	char *
310	key_fingerprint(Key *k)
311	{
312	static char retval[(EVP_MAX_MD_SIZE + 1) * 3];
313	char *digest;
314
315	digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX);
316	strlcpy(retval, digest, sizeof(retval));
317	xfree(digest);
318	return retval;
319	}
320
4fe2af09	321	/*
	322	* Reads a multiple-precision integer in decimal from the buffer, and advances
	323	* the pointer. The integer must already be initialized. This function is
	324	* permitted to modify the buffer. This leaves *cpp to point just beyond the
	325	* last processed (and maybe modified) character. Note that this may modify
	326	* the buffer containing the number.
	327	*/
	328	int
	329	read_bignum(char *cpp, BIGNUM value)
	330	{
	331	char cp = cpp;
	332	int old;
	333
	334	/* Skip any leading whitespace. */
	335	for (; cp == ' ' \|\| cp == '\t'; cp++)
	336	;
	337
	338	/* Check that it begins with a decimal digit. */
	339	if (cp < '0' \|\| cp > '9')
	340	return 0;
	341
	342	/* Save starting position. */
	343	*cpp = cp;
	344
	345	/* Move forward until all decimal digits skipped. */
	346	for (; cp >= '0' && cp <= '9'; cp++)
	347	;
	348
	349	/* Save the old terminating character, and replace it by \0. */
	350	old = *cp;
	351	*cp = 0;
	352
	353	/* Parse the number. */
	354	if (BN_dec2bn(&value, *cpp) == 0)
	355	return 0;
	356
	357	/* Restore old terminating character. */
	358	*cp = old;
	359
	360	/* Move beyond the number and return success. */
	361	*cpp = cp;
	362	return 1;
	363	}
	364	int
	365	write_bignum(FILE f, BIGNUM num)
	366	{
	367	char *buf = BN_bn2dec(num);
	368	if (buf == NULL) {
	369	error("write_bignum: BN_bn2dec() failed");
	370	return 0;
	371	}
	372	fprintf(f, " %s", buf);
53a24016	373	xfree(buf);
4fe2af09	374	return 1;
4fe2af09	375	}
fa08c86b	376
	377	/* returns 1 ok, -1 error, 0 type mismatch */
	378	int
a306f2dd	379	key_read(Key ret, char *cpp)
4fe2af09	380	{
a306f2dd	381	Key *k;
fa08c86b	382	int success = -1;
	383	char cp, space;
	384	int len, n, type;
	385	u_int bits;
1e3b8b07	386	u_char *blob;
a306f2dd	387
	388	cp = *cpp;
	389
4fe2af09	390	switch(ret->type) {
fa08c86b	391	case KEY_RSA1:
a306f2dd	392	/* Get number of bits. */
a306f2dd	393	if (cp < '0' \|\| cp > '9')
fa08c86b	394	return -1; /* Bad bit count... */
a306f2dd	395	for (bits = 0; cp >= '0' && cp <= '9'; cp++)
a306f2dd	396	bits = 10 * bits + *cp - '0';
4fe2af09	397	if (bits == 0)
fa08c86b	398	return -1;
a306f2dd	399	*cpp = cp;
4fe2af09	400	/* Get public exponent, public modulus. */
4fe2af09	401	if (!read_bignum(cpp, ret->rsa->e))
fa08c86b	402	return -1;
4fe2af09	403	if (!read_bignum(cpp, ret->rsa->n))
fa08c86b	404	return -1;
fa08c86b	405	success = 1;
4fe2af09	406	break;
fa08c86b	407	case KEY_UNSPEC:
fa08c86b	408	case KEY_RSA:
4fe2af09	409	case KEY_DSA:
fa08c86b	410	space = strchr(cp, ' ');
	411	if (space == NULL) {
	412	debug3("key_read: no space");
	413	return -1;
	414	}
	415	*space = '\0';
	416	type = key_type_from_name(cp);
	417	*space = ' ';
	418	if (type == KEY_UNSPEC) {
	419	debug3("key_read: no key found");
	420	return -1;
	421	}
	422	cp = space+1;
	423	if (*cp == '\0') {
	424	debug3("key_read: short string");
	425	return -1;
	426	}
	427	if (ret->type == KEY_UNSPEC) {
	428	ret->type = type;
	429	} else if (ret->type != type) {
	430	/* is a key, but different type */
	431	debug3("key_read: type mismatch");
4fe2af09	432	return 0;
fa08c86b	433	}
a306f2dd	434	len = 2*strlen(cp);
	435	blob = xmalloc(len);
	436	n = uudecode(cp, blob, len);
1d1ffb87	437	if (n < 0) {
71276795	438	error("key_read: uudecode %s failed", cp);
fa08c86b	439	return -1;
1d1ffb87	440	}
fa08c86b	441	k = key_from_blob(blob, n);
71276795	442	if (k == NULL) {
fa08c86b	443	error("key_read: key_from_blob %s failed", cp);
fa08c86b	444	return -1;
71276795	445	}
a306f2dd	446	xfree(blob);
fa08c86b	447	if (k->type != type) {
	448	error("key_read: type mismatch: encoding error");
	449	key_free(k);
	450	return -1;
	451	}
	452	/XXXX/
	453	if (ret->type == KEY_RSA) {
	454	if (ret->rsa != NULL)
	455	RSA_free(ret->rsa);
	456	ret->rsa = k->rsa;
	457	k->rsa = NULL;
	458	success = 1;
	459	#ifdef DEBUG_PK
	460	RSA_print_fp(stderr, ret->rsa, 8);
	461	#endif
	462	} else {
	463	if (ret->dsa != NULL)
	464	DSA_free(ret->dsa);
	465	ret->dsa = k->dsa;
	466	k->dsa = NULL;
	467	success = 1;
	468	#ifdef DEBUG_PK
	469	DSA_print_fp(stderr, ret->dsa, 8);
	470	#endif
	471	}
	472	/XXXX/
	473	if (success != 1)
	474	break;
a306f2dd	475	key_free(k);
71276795	476	/* advance cp: skip whitespace and data */
	477	while (cp == ' ' \|\| cp == '\t')
	478	cp++;
	479	while (cp != '\0' && cp != ' ' && *cp != '\t')
	480	cp++;
	481	*cpp = cp;
4fe2af09	482	break;
4fe2af09	483	default:
a306f2dd	484	fatal("key_read: bad key type: %d", ret->type);
4fe2af09	485	break;
4fe2af09	486	}
fa08c86b	487	return success;
4fe2af09	488	}
	489	int
	490	key_write(Key key, FILE f)
	491	{
	492	int success = 0;
1e3b8b07	493	u_int bits = 0;
4fe2af09	494
fa08c86b	495	if (key->type == KEY_RSA1 && key->rsa != NULL) {
4fe2af09	496	/* size of modulus 'n' */
	497	bits = BN_num_bits(key->rsa->n);
	498	fprintf(f, "%u", bits);
	499	if (write_bignum(f, key->rsa->e) &&
	500	write_bignum(f, key->rsa->n)) {
	501	success = 1;
	502	} else {
	503	error("key_write: failed for RSA key");
	504	}
fa08c86b	505	} else if ((key->type == KEY_DSA && key->dsa != NULL) \|\|
fa08c86b	506	(key->type == KEY_RSA && key->rsa != NULL)) {
a306f2dd	507	int len, n;
1e3b8b07	508	u_char blob, uu;
fa08c86b	509	key_to_blob(key, &blob, &len);
a306f2dd	510	uu = xmalloc(2*len);
1d1ffb87	511	n = uuencode(blob, len, uu, 2*len);
1d1ffb87	512	if (n > 0) {
fa08c86b	513	fprintf(f, "%s %s", key_ssh_name(key), uu);
1d1ffb87	514	success = 1;
1d1ffb87	515	}
a306f2dd	516	xfree(blob);
a306f2dd	517	xfree(uu);
4fe2af09	518	}
	519	return success;
	520	}
1d1ffb87	521	char *
	522	key_type(Key *k)
	523	{
	524	switch (k->type) {
fa08c86b	525	case KEY_RSA1:
	526	return "RSA1";
	527	break;
1d1ffb87	528	case KEY_RSA:
	529	return "RSA";
	530	break;
	531	case KEY_DSA:
	532	return "DSA";
	533	break;
	534	}
	535	return "unknown";
	536	}
fa08c86b	537	char *
	538	key_ssh_name(Key *k)
	539	{
	540	switch (k->type) {
	541	case KEY_RSA:
	542	return "ssh-rsa";
	543	break;
	544	case KEY_DSA:
	545	return "ssh-dss";
	546	break;
	547	}
	548	return "ssh-unknown";
	549	}
	550	u_int
2e73a022	551	key_size(Key *k){
2e73a022	552	switch (k->type) {
fa08c86b	553	case KEY_RSA1:
2e73a022	554	case KEY_RSA:
	555	return BN_num_bits(k->rsa->n);
	556	break;
	557	case KEY_DSA:
	558	return BN_num_bits(k->dsa->p);
	559	break;
	560	}
	561	return 0;
	562	}
fa08c86b	563
fa08c86b	564	RSA *
1e3b8b07	565	rsa_generate_private_key(u_int bits)
fa08c86b	566	{
2b87da3b	567	RSA *private;
	568	private = RSA_generate_key(bits, 35, NULL, NULL);
	569	if (private == NULL)
	570	fatal("rsa_generate_private_key: key generation failed.");
	571	return private;
fa08c86b	572	}
	573
	574	DSA*
1e3b8b07	575	dsa_generate_private_key(u_int bits)
fa08c86b	576	{
	577	DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
	578	if (private == NULL)
	579	fatal("dsa_generate_private_key: DSA_generate_parameters failed");
	580	if (!DSA_generate_key(private))
2b87da3b	581	fatal("dsa_generate_private_key: DSA_generate_key failed.");
	582	if (private == NULL)
	583	fatal("dsa_generate_private_key: NULL.");
fa08c86b	584	return private;
	585	}
	586
	587	Key *
1e3b8b07	588	key_generate(int type, u_int bits)
fa08c86b	589	{
	590	Key *k = key_new(KEY_UNSPEC);
	591	switch (type) {
2b87da3b	592	case KEY_DSA:
fa08c86b	593	k->dsa = dsa_generate_private_key(bits);
	594	break;
	595	case KEY_RSA:
	596	case KEY_RSA1:
	597	k->rsa = rsa_generate_private_key(bits);
	598	break;
	599	default:
2b87da3b	600	fatal("key_generate: unknown type %d", type);
fa08c86b	601	}
2b87da3b	602	k->type = type;
fa08c86b	603	return k;
	604	}
	605
	606	Key *
	607	key_from_private(Key *k)
	608	{
	609	Key *n = NULL;
	610	switch (k->type) {
2b87da3b	611	case KEY_DSA:
fa08c86b	612	n = key_new(k->type);
	613	BN_copy(n->dsa->p, k->dsa->p);
	614	BN_copy(n->dsa->q, k->dsa->q);
	615	BN_copy(n->dsa->g, k->dsa->g);
	616	BN_copy(n->dsa->pub_key, k->dsa->pub_key);
	617	break;
	618	case KEY_RSA:
	619	case KEY_RSA1:
	620	n = key_new(k->type);
	621	BN_copy(n->rsa->n, k->rsa->n);
	622	BN_copy(n->rsa->e, k->rsa->e);
	623	break;
	624	default:
2b87da3b	625	fatal("key_from_private: unknown type %d", k->type);
fa08c86b	626	break;
	627	}
	628	return n;
	629	}
	630
	631	int
	632	key_type_from_name(char *name)
	633	{
	634	if (strcmp(name, "rsa1") == 0){
	635	return KEY_RSA1;
	636	} else if (strcmp(name, "rsa") == 0){
	637	return KEY_RSA;
	638	} else if (strcmp(name, "dsa") == 0){
	639	return KEY_DSA;
	640	} else if (strcmp(name, "ssh-rsa") == 0){
	641	return KEY_RSA;
	642	} else if (strcmp(name, "ssh-dss") == 0){
	643	return KEY_DSA;
	644	}
539af7f5	645	debug2("key_type_from_name: unknown key type '%s'", name);
fa08c86b	646	return KEY_UNSPEC;
	647	}
	648
	649	Key *
	650	key_from_blob(char *blob, int blen)
	651	{
	652	Buffer b;
	653	char *ktype;
	654	int rlen, type;
	655	Key *key = NULL;
	656
	657	#ifdef DEBUG_PK
	658	dump_base64(stderr, blob, blen);
	659	#endif
	660	buffer_init(&b);
	661	buffer_append(&b, blob, blen);
	662	ktype = buffer_get_string(&b, NULL);
	663	type = key_type_from_name(ktype);
	664
	665	switch(type){
	666	case KEY_RSA:
	667	key = key_new(type);
fa08c86b	668	buffer_get_bignum2(&b, key->rsa->e);
b5c334cc	669	buffer_get_bignum2(&b, key->rsa->n);
fa08c86b	670	#ifdef DEBUG_PK
	671	RSA_print_fp(stderr, key->rsa, 8);
	672	#endif
	673	break;
	674	case KEY_DSA:
	675	key = key_new(type);
	676	buffer_get_bignum2(&b, key->dsa->p);
	677	buffer_get_bignum2(&b, key->dsa->q);
	678	buffer_get_bignum2(&b, key->dsa->g);
	679	buffer_get_bignum2(&b, key->dsa->pub_key);
	680	#ifdef DEBUG_PK
	681	DSA_print_fp(stderr, key->dsa, 8);
	682	#endif
	683	break;
	684	case KEY_UNSPEC:
	685	key = key_new(type);
	686	break;
	687	default:
	688	error("key_from_blob: cannot handle type %s", ktype);
	689	break;
	690	}
	691	rlen = buffer_len(&b);
	692	if (key != NULL && rlen != 0)
	693	error("key_from_blob: remaining bytes in key blob %d", rlen);
	694	xfree(ktype);
	695	buffer_free(&b);
	696	return key;
	697	}
	698
	699	int
1e3b8b07	700	key_to_blob(Key key, u_char blobp, u_int lenp)
fa08c86b	701	{
	702	Buffer b;
	703	int len;
1e3b8b07	704	u_char *buf;
fa08c86b	705
	706	if (key == NULL) {
	707	error("key_to_blob: key == NULL");
	708	return 0;
	709	}
	710	buffer_init(&b);
	711	switch(key->type){
	712	case KEY_DSA:
	713	buffer_put_cstring(&b, key_ssh_name(key));
	714	buffer_put_bignum2(&b, key->dsa->p);
	715	buffer_put_bignum2(&b, key->dsa->q);
	716	buffer_put_bignum2(&b, key->dsa->g);
	717	buffer_put_bignum2(&b, key->dsa->pub_key);
	718	break;
	719	case KEY_RSA:
	720	buffer_put_cstring(&b, key_ssh_name(key));
fa08c86b	721	buffer_put_bignum2(&b, key->rsa->e);
b5c334cc	722	buffer_put_bignum2(&b, key->rsa->n);
fa08c86b	723	break;
	724	default:
	725	error("key_to_blob: illegal key type %d", key->type);
	726	break;
	727	}
	728	len = buffer_len(&b);
	729	buf = xmalloc(len);
	730	memcpy(buf, buffer_ptr(&b), len);
	731	memset(buffer_ptr(&b), 0, len);
	732	buffer_free(&b);
	733	if (lenp != NULL)
	734	*lenp = len;
	735	if (blobp != NULL)
	736	*blobp = buf;
	737	return len;
	738	}
	739
	740	int
	741	key_sign(
	742	Key *key,
1e3b8b07	743	u_char *sigp, int lenp,
1e3b8b07	744	u_char *data, int datalen)
fa08c86b	745	{
	746	switch(key->type){
	747	case KEY_DSA:
	748	return ssh_dss_sign(key, sigp, lenp, data, datalen);
	749	break;
	750	case KEY_RSA:
	751	return ssh_rsa_sign(key, sigp, lenp, data, datalen);
	752	break;
	753	default:
	754	error("key_sign: illegal key type %d", key->type);
	755	return -1;
	756	break;
	757	}
	758	}
	759
	760	int
	761	key_verify(
	762	Key *key,
1e3b8b07	763	u_char *signature, int signaturelen,
1e3b8b07	764	u_char *data, int datalen)
fa08c86b	765	{
	766	switch(key->type){
	767	case KEY_DSA:
	768	return ssh_dss_verify(key, signature, signaturelen, data, datalen);
	769	break;
	770	case KEY_RSA:
	771	return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
	772	break;
	773	default:
	774	error("key_verify: illegal key type %d", key->type);
	775	return -1;
	776	break;
	777	}
	778	}