[thirdparty/openssl.git] / crypto / dsa / dsa_ameth.c

/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  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.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS CONTRIBUTORS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/dsa.h>
#ifndef OPENSSL_NO_CMS
#include <openssl/cms.h>
#endif
#include "asn1_locl.h"

static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
	{
	const unsigned char *p, *pm;
	int pklen, pmlen;
	int ptype;
	void *pval;
	ASN1_STRING *pstr;
	X509_ALGOR *palg;
	ASN1_INTEGER *public_key = NULL;

	DSA *dsa = NULL;

	if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
		return 0;
	X509_ALGOR_get0(NULL, &ptype, &pval, palg);


	if (ptype == V_ASN1_SEQUENCE)
		{
		pstr = pval;	
		pm = pstr->data;
		pmlen = pstr->length;

		if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
			{
			DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
			goto err;
			}

		}
	else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF))
		{
		if (!(dsa = DSA_new()))
			{
			DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}
	else
		{
		DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
		goto err;
		}

	if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
		{
		DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
		goto err;
		}

	if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
		{
		DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
		goto err;
		}

	ASN1_INTEGER_free(public_key);
	EVP_PKEY_assign_DSA(pkey, dsa);
	return 1;

	err:
	if (public_key)
		ASN1_INTEGER_free(public_key);
	if (dsa)
		DSA_free(dsa);
	return 0;

	}

static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
	{
	DSA *dsa;
	void *pval = NULL;
	int ptype;
	unsigned char *penc = NULL;
	int penclen;

	dsa=pkey->pkey.dsa;
	if (pkey->save_parameters && dsa->p && dsa->q && dsa->g)
		{
		ASN1_STRING *str;
		str = ASN1_STRING_new();
		str->length = i2d_DSAparams(dsa, &str->data);
		if (str->length <= 0)
			{
			DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
			goto err;
			}
		pval = str;
		ptype = V_ASN1_SEQUENCE;
		}
	else
		ptype = V_ASN1_UNDEF;

	dsa->write_params=0;

	penclen = i2d_DSAPublicKey(dsa, &penc);

	if (penclen <= 0)
		{
		DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
		goto err;
		}

	if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
				ptype, pval, penc, penclen))
		return 1;

	err:
	if (penc)
		OPENSSL_free(penc);
	if (pval)
		ASN1_STRING_free(pval);

	return 0;
	}

/* In PKCS#8 DSA: you just get a private key integer and parameters in the
 * AlgorithmIdentifier the pubkey must be recalculated.
 */
	
static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
	{
	const unsigned char *p, *pm;
	int pklen, pmlen;
	int ptype;
	void *pval;
	ASN1_STRING *pstr;
	X509_ALGOR *palg;
	ASN1_INTEGER *privkey = NULL;
	BN_CTX *ctx = NULL;

	STACK_OF(ASN1_TYPE) *ndsa = NULL;
	DSA *dsa = NULL;

	if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
		return 0;
	X509_ALGOR_get0(NULL, &ptype, &pval, palg);

	/* Check for broken DSA PKCS#8, UGH! */
	if (*p == (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
		{
		ASN1_TYPE *t1, *t2;
	    	if(!(ndsa = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen)));
			goto decerr;
		if (sk_ASN1_TYPE_num(ndsa) != 2)
			goto decerr;
		/* Handle Two broken types:
	    	 * SEQUENCE {parameters, priv_key}
		 * SEQUENCE {pub_key, priv_key}
		 */

		t1 = sk_ASN1_TYPE_value(ndsa, 0);
		t2 = sk_ASN1_TYPE_value(ndsa, 1);
		if (t1->type == V_ASN1_SEQUENCE)
			{
			p8->broken = PKCS8_EMBEDDED_PARAM;
			pval = t1->value.ptr;
			}
		else if (ptype == V_ASN1_SEQUENCE)
			p8->broken = PKCS8_NS_DB;
		else
			goto decerr;

		if (t2->type != V_ASN1_INTEGER)
			goto decerr;

		privkey = t2->value.integer;
		}
	else
		{
		if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
			goto decerr;
		if (ptype != V_ASN1_SEQUENCE)
			goto decerr;
		}

	pstr = pval;	
	pm = pstr->data;
	pmlen = pstr->length;
	if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
		goto decerr;
	/* We have parameters now set private key */
	if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
		{
		DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
		goto dsaerr;
		}
	/* Calculate public key */
	if (!(dsa->pub_key = BN_new()))
		{
		DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
		goto dsaerr;
		}
	if (!(ctx = BN_CTX_new()))
		{
		DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
		goto dsaerr;
		}
			
	if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
		{
		DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
		goto dsaerr;
		}

	EVP_PKEY_assign_DSA(pkey, dsa);
	BN_CTX_free (ctx);
	if(ndsa)
		sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
	else
		ASN1_INTEGER_free(privkey);

	return 1;

	decerr:
	DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
	dsaerr:
	BN_CTX_free (ctx);
	if (privkey)
		ASN1_INTEGER_free(privkey);
	sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
	DSA_free(dsa);
	return 0;
	}

static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
	ASN1_STRING *params = NULL;
	ASN1_INTEGER *prkey = NULL;
	unsigned char *dp = NULL;
	int dplen;

	params = ASN1_STRING_new();

	if (!params)
		{
		DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
		goto err;
		}

	params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
	if (params->length <= 0)
		{
		DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
		goto err;
		}
	params->type = V_ASN1_SEQUENCE;

	/* Get private key into integer */
	prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);

	if (!prkey)
		{
		DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
		goto err;
		}

	dplen = i2d_ASN1_INTEGER(prkey, &dp);

	ASN1_INTEGER_free(prkey);

	if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
				V_ASN1_SEQUENCE, params, dp, dplen))
		goto err;

	return 1;

err:
	if (dp != NULL)
		OPENSSL_free(dp);
	if (params != NULL)
		ASN1_STRING_free(params);
	if (prkey != NULL)
		ASN1_INTEGER_free(prkey);
	return 0;
}

static int int_dsa_size(const EVP_PKEY *pkey)
	{
	return(DSA_size(pkey->pkey.dsa));
	}

static int dsa_bits(const EVP_PKEY *pkey)
	{
	return BN_num_bits(pkey->pkey.dsa->p);
	}

static int dsa_missing_parameters(const EVP_PKEY *pkey)
	{
	DSA *dsa;
	dsa=pkey->pkey.dsa;
	if ((dsa->p == NULL) || (dsa->q == NULL) || (dsa->g == NULL))
			return 1;
	return 0;
	}

static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
	{
	BIGNUM *a;

	if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
		return 0;
	if (to->pkey.dsa->p != NULL)
		BN_free(to->pkey.dsa->p);
	to->pkey.dsa->p=a;

	if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
		return 0;
	if (to->pkey.dsa->q != NULL)
		BN_free(to->pkey.dsa->q);
	to->pkey.dsa->q=a;

	if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
		return 0;
	if (to->pkey.dsa->g != NULL)
		BN_free(to->pkey.dsa->g);
	to->pkey.dsa->g=a;
	return 1;
	}

static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
	{
	if (	BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) ||
		BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) ||
		BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
		return 0;
	else
		return 1;
	}

static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
	{
	if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
		return 0;
	else
		return 1;
	}

static void int_dsa_free(EVP_PKEY *pkey)
	{
	DSA_free(pkey->pkey.dsa);
	}

static void update_buflen(const BIGNUM *b, size_t *pbuflen)
	{
	size_t i;
	if (!b)
		return;
	if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
			*pbuflen = i;
	}

static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
	{
	unsigned char *m=NULL;
	int ret=0;
	size_t buf_len=0;
	const char *ktype = NULL;

	const BIGNUM *priv_key, *pub_key;

	if (ptype == 2)
		priv_key = x->priv_key;
	else
		priv_key = NULL;

	if (ptype > 0)
		pub_key = x->pub_key;
	else
		pub_key = NULL;

	if (ptype == 2)
		ktype = "Private-Key";
	else if (ptype == 1)
		ktype = "Public-Key";
	else
		ktype = "DSA-Parameters";

	update_buflen(x->p, &buf_len);
	update_buflen(x->q, &buf_len);
	update_buflen(x->g, &buf_len);
	update_buflen(priv_key, &buf_len);
	update_buflen(pub_key, &buf_len);

	m=(unsigned char *)OPENSSL_malloc(buf_len+10);
	if (m == NULL)
		{
		DSAerr(DSA_F_DO_DSA_PRINT,ERR_R_MALLOC_FAILURE);
		goto err;
		}

	if (priv_key)
		{
		if(!BIO_indent(bp,off,128))
		   goto err;
		if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
			<= 0) goto err;
		}

	if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
		goto err;
	if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
		goto err;
	if (!ASN1_bn_print(bp,"P:   ",x->p,m,off)) goto err;
	if (!ASN1_bn_print(bp,"Q:   ",x->q,m,off)) goto err;
	if (!ASN1_bn_print(bp,"G:   ",x->g,m,off)) goto err;
	ret=1;
err:
	if (m != NULL) OPENSSL_free(m);
	return(ret);
	}

static int dsa_param_decode(EVP_PKEY *pkey,
					const unsigned char **pder, int derlen)
	{
	DSA *dsa;
	if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
		{
		DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
		return 0;
		}
	EVP_PKEY_assign_DSA(pkey, dsa);
	return 1;
	}

static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
	{
	return i2d_DSAparams(pkey->pkey.dsa, pder);
	}

static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
							ASN1_PCTX *ctx)
	{
	return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
	}

static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
							ASN1_PCTX *ctx)
	{
	return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
	}


static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
							ASN1_PCTX *ctx)
	{
	return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
	}

static int old_dsa_priv_decode(EVP_PKEY *pkey,
					const unsigned char **pder, int derlen)
	{
	DSA *dsa;
	if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
		{
		DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
		return 0;
		}
	EVP_PKEY_assign_DSA(pkey, dsa);
	return 1;
	}

static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
	{
	return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
	}

static int dsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
	{
	switch (op)
		{
		case ASN1_PKEY_CTRL_PKCS7_SIGN:
		if (arg1 == 0)
			{
			int snid, hnid;
			X509_ALGOR *alg1, *alg2;
			PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
			if (alg1 == NULL || alg1->algorithm == NULL)
				return -1;
			hnid = OBJ_obj2nid(alg1->algorithm);
			if (hnid == NID_undef)
				return -1;
			if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
				return -1; 
			X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
			}
		return 1;
#ifndef OPENSSL_NO_CMS
		case ASN1_PKEY_CTRL_CMS_SIGN:
		if (arg1 == 0)
			{
			int snid, hnid;
			X509_ALGOR *alg1, *alg2;
			CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
			if (alg1 == NULL || alg1->algorithm == NULL)
				return -1;
			hnid = OBJ_obj2nid(alg1->algorithm);
			if (hnid == NID_undef)
				return -1;
			if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
				return -1; 
			X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
			}
		return 1;
#endif

		case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
		*(int *)arg2 = NID_sha1;
		return 2;

		default:
		return -2;

		}

	}

/* NB these are sorted in pkey_id order, lowest first */

const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] = 
	{

		{
		EVP_PKEY_DSA2,
		EVP_PKEY_DSA,
		ASN1_PKEY_ALIAS
		},

		{
		EVP_PKEY_DSA1,
		EVP_PKEY_DSA,
		ASN1_PKEY_ALIAS
		},

		{
		EVP_PKEY_DSA4,
		EVP_PKEY_DSA,
		ASN1_PKEY_ALIAS
		},

		{
		EVP_PKEY_DSA3,
		EVP_PKEY_DSA,
		ASN1_PKEY_ALIAS
		},

		{
		EVP_PKEY_DSA,
		EVP_PKEY_DSA,
		0,

		"DSA",
		"OpenSSL DSA method",

		dsa_pub_decode,
		dsa_pub_encode,
		dsa_pub_cmp,
		dsa_pub_print,

		dsa_priv_decode,
		dsa_priv_encode,
		dsa_priv_print,

		int_dsa_size,
		dsa_bits,

		dsa_param_decode,
		dsa_param_encode,
		dsa_missing_parameters,
		dsa_copy_parameters,
		dsa_cmp_parameters,
		dsa_param_print,

		int_dsa_free,
		dsa_pkey_ctrl,
		old_dsa_priv_decode,
		old_dsa_priv_encode
		}
	};
Commit	Line	Data
448be743 DSH	1	/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
	2	* project 2006.
	3	*/
	4	/* ====================================================================
	5	* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	*
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in
	16	* the documentation and/or other materials provided with the
	17	* distribution.
	18	*
	19	* 3. All advertising materials mentioning features or use of this
	20	* software must display the following acknowledgment:
	21	* "This product includes software developed by the OpenSSL Project
	22	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	23	*
	24	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	25	* endorse or promote products derived from this software without
	26	* prior written permission. For written permission, please contact
	27	* licensing@OpenSSL.org.
	28	*
	29	* 5. Products derived from this software may not be called "OpenSSL"
	30	* nor may "OpenSSL" appear in their names without prior written
	31	* permission of the OpenSSL Project.
	32	*
	33	* 6. Redistributions of any form whatsoever must retain the following
	34	* acknowledgment:
	35	* "This product includes software developed by the OpenSSL Project
	36	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	37	*
	38	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	39	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	40	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	41	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	42	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	43	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	44	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	45	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	46	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	47	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	48	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	49	* OF THE POSSIBILITY OF SUCH DAMAGE.
	50	* ====================================================================
	51	*
	52	* This product includes cryptographic software written by Eric Young
	53	* (eay@cryptsoft.com). This product includes software written by Tim
	54	* Hudson (tjh@cryptsoft.com).
	55	*
	56	*/
	57
	58	#include <stdio.h>
	59	#include "cryptlib.h"
	60	#include <openssl/x509.h>
	61	#include <openssl/asn1.h>
	62	#include <openssl/dsa.h>
8931b30d DSH	63	#ifndef OPENSSL_NO_CMS
	64	#include <openssl/cms.h>
	65	#endif
18e377b4	66	#include "asn1_locl.h"
448be743 DSH	67
	68	static int dsa_pub_decode(EVP_PKEY pkey, X509_PUBKEY pubkey)
	69	{
	70	const unsigned char p, pm;
	71	int pklen, pmlen;
	72	int ptype;
	73	void *pval;
	74	ASN1_STRING *pstr;
	75	X509_ALGOR *palg;
	76	ASN1_INTEGER *public_key = NULL;
	77
	78	DSA *dsa = NULL;
	79
	80	if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
	81	return 0;
	82	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
	83
3f36baa9 DSH	84
3f36baa9 DSH	85	if (ptype == V_ASN1_SEQUENCE)
448be743	86	{
3f36baa9 DSH	87	pstr = pval;
	88	pm = pstr->data;
	89	pmlen = pstr->length;
448be743	90
3f36baa9 DSH	91	if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
	92	{
	93	DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
	94	goto err;
	95	}
448be743	96
3f36baa9 DSH	97	}
3f36baa9 DSH	98	else if ((ptype == V_ASN1_NULL) \|\| (ptype == V_ASN1_UNDEF))
448be743	99	{
3f36baa9 DSH	100	if (!(dsa = DSA_new()))
	101	{
	102	DSAerr(DSA_F_DSA_PUB_DECODE, ERR_R_MALLOC_FAILURE);
	103	goto err;
	104	}
	105	}
	106	else
	107	{
	108	DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_PARAMETER_ENCODING_ERROR);
448be743 DSH	109	goto err;
	110	}
	111
	112	if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
	113	{
	114	DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_DECODE_ERROR);
	115	goto err;
	116	}
	117
448be743 DSH	118	if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
	119	{
	120	DSAerr(DSA_F_DSA_PUB_DECODE, DSA_R_BN_DECODE_ERROR);
	121	goto err;
	122	}
	123
	124	ASN1_INTEGER_free(public_key);
b2c0518e	125	EVP_PKEY_assign_DSA(pkey, dsa);
448be743 DSH	126	return 1;
	127
	128	err:
442cbb06	129	if (public_key)
448be743 DSH	130	ASN1_INTEGER_free(public_key);
	131	if (dsa)
	132	DSA_free(dsa);
	133	return 0;
	134
	135	}
	136
6f81892e	137	static int dsa_pub_encode(X509_PUBKEY pk, const EVP_PKEY pkey)
448be743 DSH	138	{
448be743 DSH	139	DSA *dsa;
99516f81	140	void *pval = NULL;
448be743 DSH	141	int ptype;
	142	unsigned char *penc = NULL;
	143	int penclen;
	144
	145	dsa=pkey->pkey.dsa;
3f36baa9	146	if (pkey->save_parameters && dsa->p && dsa->q && dsa->g)
448be743 DSH	147	{
	148	ASN1_STRING *str;
	149	str = ASN1_STRING_new();
	150	str->length = i2d_DSAparams(dsa, &str->data);
	151	if (str->length <= 0)
	152	{
	153	DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
	154	goto err;
	155	}
b2c0518e	156	pval = str;
448be743 DSH	157	ptype = V_ASN1_SEQUENCE;
	158	}
	159	else
448be743	160	ptype = V_ASN1_UNDEF;
3f36baa9	161
448be743 DSH	162	dsa->write_params=0;
	163
	164	penclen = i2d_DSAPublicKey(dsa, &penc);
	165
	166	if (penclen <= 0)
	167	{
	168	DSAerr(DSA_F_DSA_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
	169	goto err;
	170	}
	171
	172	if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
	173	ptype, pval, penc, penclen))
	174	return 1;
	175
	176	err:
	177	if (penc)
	178	OPENSSL_free(penc);
	179	if (pval)
	180	ASN1_STRING_free(pval);
	181
	182	return 0;
	183	}
	184
	185	/* In PKCS#8 DSA: you just get a private key integer and parameters in the
	186	* AlgorithmIdentifier the pubkey must be recalculated.
	187	*/
	188
	189	static int dsa_priv_decode(EVP_PKEY pkey, PKCS8_PRIV_KEY_INFO p8)
	190	{
	191	const unsigned char p, pm;
	192	int pklen, pmlen;
	193	int ptype;
	194	void *pval;
	195	ASN1_STRING *pstr;
	196	X509_ALGOR *palg;
	197	ASN1_INTEGER *privkey = NULL;
	198	BN_CTX *ctx = NULL;
	199
	200	STACK_OF(ASN1_TYPE) *ndsa = NULL;
	201	DSA *dsa = NULL;
	202
	203	if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
	204	return 0;
	205	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
	206
	207	/* Check for broken DSA PKCS#8, UGH! */
	208	if (*p == (V_ASN1_SEQUENCE\|V_ASN1_CONSTRUCTED))
	209	{
	210	ASN1_TYPE t1, t2;
de121164	211	if(!(ndsa = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen)));
448be743 DSH	212	goto decerr;
	213	if (sk_ASN1_TYPE_num(ndsa) != 2)
	214	goto decerr;
	215	/* Handle Two broken types:
	216	* SEQUENCE {parameters, priv_key}
	217	* SEQUENCE {pub_key, priv_key}
	218	*/
	219
	220	t1 = sk_ASN1_TYPE_value(ndsa, 0);
	221	t2 = sk_ASN1_TYPE_value(ndsa, 1);
	222	if (t1->type == V_ASN1_SEQUENCE)
	223	{
	224	p8->broken = PKCS8_EMBEDDED_PARAM;
	225	pval = t1->value.ptr;
	226	}
	227	else if (ptype == V_ASN1_SEQUENCE)
	228	p8->broken = PKCS8_NS_DB;
	229	else
	230	goto decerr;
	231
	232	if (t2->type != V_ASN1_INTEGER)
	233	goto decerr;
	234
	235	privkey = t2->value.integer;
	236	}
	237	else
	238	{
	239	if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
	240	goto decerr;
	241	if (ptype != V_ASN1_SEQUENCE)
	242	goto decerr;
	243	}
	244
	245	pstr = pval;
	246	pm = pstr->data;
	247	pmlen = pstr->length;
	248	if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
	249	goto decerr;
	250	/* We have parameters now set private key */
	251	if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
	252	{
	253	DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
	254	goto dsaerr;
	255	}
	256	/* Calculate public key */
	257	if (!(dsa->pub_key = BN_new()))
	258	{
	259	DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
	260	goto dsaerr;
	261	}
	262	if (!(ctx = BN_CTX_new()))
	263	{
	264	DSAerr(DSA_F_DSA_PRIV_DECODE, ERR_R_MALLOC_FAILURE);
	265	goto dsaerr;
	266	}
	267
	268	if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx))
	269	{
	270	DSAerr(DSA_F_DSA_PRIV_DECODE,DSA_R_BN_ERROR);
	271	goto dsaerr;
	272	}
	273
	274	EVP_PKEY_assign_DSA(pkey, dsa);
	275	BN_CTX_free (ctx);
276	if(ndsa)
277	sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
278	else
279	ASN1_INTEGER_free(privkey);
280
281	return 1;
282
283	decerr:
284	DSAerr(DSA_F_DSA_PRIV_DECODE, EVP_R_DECODE_ERROR);
285	dsaerr:
286	BN_CTX_free (ctx);
023c9d8d DSH	287	if (privkey)
023c9d8d DSH	288	ASN1_INTEGER_free(privkey);
448be743 DSH	289	sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
448be743 DSH	290	DSA_free(dsa);
448be743 DSH	291	return 0;
	292	}
	293
6f81892e	294	static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO p8, const EVP_PKEY pkey)
448be743 DSH	295	{
	296	ASN1_STRING *params = NULL;
	297	ASN1_INTEGER *prkey = NULL;
	298	unsigned char *dp = NULL;
	299	int dplen;
	300
	301	params = ASN1_STRING_new();
	302
	303	if (!params)
	304	{
	305	DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
	306	goto err;
	307	}
	308
	309	params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
	310	if (params->length <= 0)
	311	{
	312	DSAerr(DSA_F_DSA_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
	313	goto err;
	314	}
	315	params->type = V_ASN1_SEQUENCE;
	316
	317	/* Get private key into integer */
	318	prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
	319
	320	if (!prkey)
	321	{
	322	DSAerr(DSA_F_DSA_PRIV_ENCODE,DSA_R_BN_ERROR);
	323	goto err;
	324	}
	325
	326	dplen = i2d_ASN1_INTEGER(prkey, &dp);
	327
	328	ASN1_INTEGER_free(prkey);
	329
	330	if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0,
	331	V_ASN1_SEQUENCE, params, dp, dplen))
	332	goto err;
	333
	334	return 1;
	335
	336	err:
	337	if (dp != NULL)
	338	OPENSSL_free(dp);
	339	if (params != NULL)
	340	ASN1_STRING_free(params);
	341	if (prkey != NULL)
	342	ASN1_INTEGER_free(prkey);
	343	return 0;
	344	}
	345
6f81892e DSH	346	static int int_dsa_size(const EVP_PKEY *pkey)
	347	{
	348	return(DSA_size(pkey->pkey.dsa));
	349	}
	350
	351	static int dsa_bits(const EVP_PKEY *pkey)
	352	{
	353	return BN_num_bits(pkey->pkey.dsa->p);
	354	}
	355
	356	static int dsa_missing_parameters(const EVP_PKEY *pkey)
	357	{
	358	DSA *dsa;
	359	dsa=pkey->pkey.dsa;
	360	if ((dsa->p == NULL) \|\| (dsa->q == NULL) \|\| (dsa->g == NULL))
	361	return 1;
	362	return 0;
	363	}
	364
	365	static int dsa_copy_parameters(EVP_PKEY to, const EVP_PKEY from)
	366	{
	367	BIGNUM *a;
	368
	369	if ((a=BN_dup(from->pkey.dsa->p)) == NULL)
	370	return 0;
	371	if (to->pkey.dsa->p != NULL)
	372	BN_free(to->pkey.dsa->p);
	373	to->pkey.dsa->p=a;
	374
	375	if ((a=BN_dup(from->pkey.dsa->q)) == NULL)
	376	return 0;
	377	if (to->pkey.dsa->q != NULL)
	378	BN_free(to->pkey.dsa->q);
	379	to->pkey.dsa->q=a;
	380
	381	if ((a=BN_dup(from->pkey.dsa->g)) == NULL)
	382	return 0;
	383	if (to->pkey.dsa->g != NULL)
	384	BN_free(to->pkey.dsa->g);
	385	to->pkey.dsa->g=a;
	386	return 1;
	387	}
	388
	389	static int dsa_cmp_parameters(const EVP_PKEY a, const EVP_PKEY b)
	390	{
	391	if ( BN_cmp(a->pkey.dsa->p,b->pkey.dsa->p) \|\|
	392	BN_cmp(a->pkey.dsa->q,b->pkey.dsa->q) \|\|
	393	BN_cmp(a->pkey.dsa->g,b->pkey.dsa->g))
	394	return 0;
	395	else
	396	return 1;
	397	}
	398
0cb8499b DSH	399	static int dsa_pub_cmp(const EVP_PKEY a, const EVP_PKEY b)
0cb8499b DSH	400	{
0cb8499b DSH	401	if (BN_cmp(b->pkey.dsa->pub_key,a->pkey.dsa->pub_key) != 0)
	402	return 0;
	403	else
	404	return 1;
	405	}
	406
6f81892e DSH	407	static void int_dsa_free(EVP_PKEY *pkey)
	408	{
	409	DSA_free(pkey->pkey.dsa);
	410	}
	411
35208f36 DSH	412	static void update_buflen(const BIGNUM b, size_t pbuflen)
35208f36 DSH	413	{
c20276e4	414	size_t i;
35208f36 DSH	415	if (!b)
	416	return;
	417	if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
	418	*pbuflen = i;
	419	}
	420
777c47ac	421	static int do_dsa_print(BIO bp, const DSA x, int off, int ptype)
35208f36 DSH	422	{
	423	unsigned char *m=NULL;
	424	int ret=0;
	425	size_t buf_len=0;
	426	const char *ktype = NULL;
	427
	428	const BIGNUM priv_key, pub_key;
	429
	430	if (ptype == 2)
	431	priv_key = x->priv_key;
	432	else
	433	priv_key = NULL;
	434
	435	if (ptype > 0)
	436	pub_key = x->pub_key;
	437	else
	438	pub_key = NULL;
	439
	440	if (ptype == 2)
	441	ktype = "Private-Key";
	442	else if (ptype == 1)
	443	ktype = "Public-Key";
	444	else
	445	ktype = "DSA-Parameters";
	446
35208f36 DSH	447	update_buflen(x->p, &buf_len);
	448	update_buflen(x->q, &buf_len);
	449	update_buflen(x->g, &buf_len);
	450	update_buflen(priv_key, &buf_len);
	451	update_buflen(pub_key, &buf_len);
	452
	453	m=(unsigned char *)OPENSSL_malloc(buf_len+10);
	454	if (m == NULL)
	455	{
5c95c2ac	456	DSAerr(DSA_F_DO_DSA_PRINT,ERR_R_MALLOC_FAILURE);
35208f36 DSH	457	goto err;
	458	}
	459
	460	if (priv_key)
	461	{
	462	if(!BIO_indent(bp,off,128))
	463	goto err;
	464	if (BIO_printf(bp,"%s: (%d bit)\n",ktype, BN_num_bits(x->p))
	465	<= 0) goto err;
	466	}
	467
	468	if (!ASN1_bn_print(bp,"priv:",priv_key,m,off))
	469	goto err;
	470	if (!ASN1_bn_print(bp,"pub: ",pub_key,m,off))
	471	goto err;
	472	if (!ASN1_bn_print(bp,"P: ",x->p,m,off)) goto err;
	473	if (!ASN1_bn_print(bp,"Q: ",x->q,m,off)) goto err;
	474	if (!ASN1_bn_print(bp,"G: ",x->g,m,off)) goto err;
	475	ret=1;
	476	err:
	477	if (m != NULL) OPENSSL_free(m);
	478	return(ret);
	479	}
	480
3e4585c8 DSH	481	static int dsa_param_decode(EVP_PKEY *pkey,
	482	const unsigned char **pder, int derlen)
	483	{
	484	DSA *dsa;
	485	if (!(dsa = d2i_DSAparams(NULL, pder, derlen)))
	486	{
	487	DSAerr(DSA_F_DSA_PARAM_DECODE, ERR_R_DSA_LIB);
	488	return 0;
	489	}
	490	EVP_PKEY_assign_DSA(pkey, dsa);
	491	return 1;
	492	}
	493
	494	static int dsa_param_encode(const EVP_PKEY pkey, unsigned char *pder)
	495	{
	496	return i2d_DSAparams(pkey->pkey.dsa, pder);
	497	}
35208f36 DSH	498
	499	static int dsa_param_print(BIO bp, const EVP_PKEY pkey, int indent,
	500	ASN1_PCTX *ctx)
	501	{
	502	return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
	503	}
	504
	505	static int dsa_pub_print(BIO bp, const EVP_PKEY pkey, int indent,
	506	ASN1_PCTX *ctx)
	507	{
	508	return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
	509	}
	510
	511
	512	static int dsa_priv_print(BIO bp, const EVP_PKEY pkey, int indent,
	513	ASN1_PCTX *ctx)
	514	{
	515	return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
	516	}
	517
e4263314 DSH	518	static int old_dsa_priv_decode(EVP_PKEY *pkey,
	519	const unsigned char **pder, int derlen)
	520	{
	521	DSA *dsa;
	522	if (!(dsa = d2i_DSAPrivateKey (NULL, pder, derlen)))
	523	{
5c95c2ac	524	DSAerr(DSA_F_OLD_DSA_PRIV_DECODE, ERR_R_DSA_LIB);
e4263314 DSH	525	return 0;
	526	}
	527	EVP_PKEY_assign_DSA(pkey, dsa);
	528	return 1;
	529	}
	530
	531	static int old_dsa_priv_encode(const EVP_PKEY pkey, unsigned char *pder)
	532	{
	533	return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
	534	}
	535
492a9e24 DSH	536	static int dsa_pkey_ctrl(EVP_PKEY pkey, int op, long arg1, void arg2)
	537	{
	538	switch (op)
	539	{
	540	case ASN1_PKEY_CTRL_PKCS7_SIGN:
	541	if (arg1 == 0)
	542	{
357d5de5	543	int snid, hnid;
492a9e24 DSH	544	X509_ALGOR alg1, alg2;
492a9e24 DSH	545	PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
357d5de5 NL	546	if (alg1 == NULL \|\| alg1->algorithm == NULL)
	547	return -1;
	548	hnid = OBJ_obj2nid(alg1->algorithm);
	549	if (hnid == NID_undef)
	550	return -1;
	551	if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
	552	return -1;
	553	X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
492a9e24 DSH	554	}
492a9e24 DSH	555	return 1;
8931b30d DSH	556	#ifndef OPENSSL_NO_CMS
	557	case ASN1_PKEY_CTRL_CMS_SIGN:
	558	if (arg1 == 0)
	559	{
	560	int snid, hnid;
	561	X509_ALGOR alg1, alg2;
	562	CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
	563	if (alg1 == NULL \|\| alg1->algorithm == NULL)
	564	return -1;
	565	hnid = OBJ_obj2nid(alg1->algorithm);
	566	if (hnid == NID_undef)
	567	return -1;
	568	if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
	569	return -1;
	570	X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
	571	}
	572	return 1;
	573	#endif
492a9e24	574
03919683 DSH	575	case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
	576	(int )arg2 = NID_sha1;
	577	return 2;
	578
492a9e24 DSH	579	default:
	580	return -2;
	581
	582	}
	583
	584	}
	585
448be743 DSH	586	/* NB these are sorted in pkey_id order, lowest first */
	587
	588	const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[] =
	589	{
	590
	591	{
	592	EVP_PKEY_DSA2,
	593	EVP_PKEY_DSA,
	594	ASN1_PKEY_ALIAS
	595	},
	596
	597	{
	598	EVP_PKEY_DSA1,
	599	EVP_PKEY_DSA,
	600	ASN1_PKEY_ALIAS
	601	},
	602
	603	{
	604	EVP_PKEY_DSA4,
	605	EVP_PKEY_DSA,
	606	ASN1_PKEY_ALIAS
	607	},
	608
	609	{
	610	EVP_PKEY_DSA3,
	611	EVP_PKEY_DSA,
	612	ASN1_PKEY_ALIAS
	613	},
	614
	615	{
	616	EVP_PKEY_DSA,
	617	EVP_PKEY_DSA,
	618	0,
6f81892e	619
e4263314	620	"DSA",
d82e2718 DSH	621	"OpenSSL DSA method",
d82e2718 DSH	622
448be743 DSH	623	dsa_pub_decode,
448be743 DSH	624	dsa_pub_encode,
6f81892e	625	dsa_pub_cmp,
35208f36	626	dsa_pub_print,
6f81892e	627
448be743 DSH	628	dsa_priv_decode,
448be743 DSH	629	dsa_priv_encode,
35208f36	630	dsa_priv_print,
6f81892e DSH	631
	632	int_dsa_size,
	633	dsa_bits,
	634
3e4585c8 DSH	635	dsa_param_decode,
3e4585c8 DSH	636	dsa_param_encode,
6f81892e DSH	637	dsa_missing_parameters,
	638	dsa_copy_parameters,
	639	dsa_cmp_parameters,
35208f36	640	dsa_param_print,
6f81892e DSH	641
6f81892e DSH	642	int_dsa_free,
492a9e24	643	dsa_pkey_ctrl,
e4263314 DSH	644	old_dsa_priv_decode,
e4263314 DSH	645	old_dsa_priv_encode
448be743 DSH	646	}
	647	};
	648