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openssl/crypto/dsa/dsa_ameth.c

Index: openssl/crypto/dsa/dsa_ameth.c
===================================================================
--- openssl/crypto/dsa/dsa_ameth.c	(revision 0)
+++ openssl/crypto/dsa/dsa_ameth.c	(revision 0)
@@ -0,0 +1,657 @@
+/* Written by Dr Stephen N Henson (steve@openssl.org) 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>
+#include <openssl/bn.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
+		{
+		const unsigned char *q = p;
+		if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
+			goto decerr;
+		if (privkey->type == V_ASN1_NEG_INTEGER)
+			{
+			p8->broken = PKCS8_NEG_PRIVKEY;
+			ASN1_INTEGER_free(privkey);
+			if (!(privkey=d2i_ASN1_UINTEGER(NULL, &q, 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
+		}
+	};
+