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openssl/crypto/ec/ec_pmeth.c

Index: openssl/crypto/ec/ec_pmeth.c
===================================================================
--- openssl/crypto/ec/ec_pmeth.c	(revision 0)
+++ openssl/crypto/ec/ec_pmeth.c	(revision 0)
@@ -0,0 +1,340 @@
+/* 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/asn1t.h>
+#include <openssl/x509.h>
+#include <openssl/ec.h>
+#include <openssl/ecdsa.h>
+#include <openssl/evp.h>
+#include "evp_locl.h"
+
+/* EC pkey context structure */
+
+typedef struct
+	{
+	/* Key and paramgen group */
+	EC_GROUP *gen_group;
+	/* message digest */
+	const EVP_MD *md;
+	} EC_PKEY_CTX;
+
+static int pkey_ec_init(EVP_PKEY_CTX *ctx)
+	{
+	EC_PKEY_CTX *dctx;
+	dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
+	if (!dctx)
+		return 0;
+	dctx->gen_group = NULL;
+	dctx->md = NULL;
+
+	ctx->data = dctx;
+
+	return 1;
+	}
+
+static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
+	{
+	EC_PKEY_CTX *dctx, *sctx;
+	if (!pkey_ec_init(dst))
+		return 0;
+       	sctx = src->data;
+	dctx = dst->data;
+	if (sctx->gen_group)
+		{
+		dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
+		if (!dctx->gen_group)
+			return 0;
+		}
+	dctx->md = sctx->md;
+	return 1;
+	}
+
+static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
+	{
+	EC_PKEY_CTX *dctx = ctx->data;
+	if (dctx)
+		{
+		if (dctx->gen_group)
+			EC_GROUP_free(dctx->gen_group);
+		OPENSSL_free(dctx);
+		}
+	}
+
+static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
+					const unsigned char *tbs, size_t tbslen)
+	{
+	int ret, type;
+	unsigned int sltmp;
+	EC_PKEY_CTX *dctx = ctx->data;
+	EC_KEY *ec = ctx->pkey->pkey.ec;
+
+	if (!sig)
+		{
+		*siglen = ECDSA_size(ec);
+		return 1;
+		}
+	else if(*siglen < (size_t)ECDSA_size(ec))
+		{
+		ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
+		return 0;
+		}
+
+	if (dctx->md)
+		type = EVP_MD_type(dctx->md);
+	else
+		type = NID_sha1;
+
+
+	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
+
+	if (ret <= 0)
+		return ret;
+	*siglen = (size_t)sltmp;
+	return 1;
+	}
+
+static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
+					const unsigned char *sig, size_t siglen,
+					const unsigned char *tbs, size_t tbslen)
+	{
+	int ret, type;
+	EC_PKEY_CTX *dctx = ctx->data;
+	EC_KEY *ec = ctx->pkey->pkey.ec;
+
+	if (dctx->md)
+		type = EVP_MD_type(dctx->md);
+	else
+		type = NID_sha1;
+
+	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
+
+	return ret;
+	}
+
+static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
+	{
+	int ret;
+	size_t outlen;
+	const EC_POINT *pubkey = NULL;
+	if (!ctx->pkey || !ctx->peerkey)
+		{
+		ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
+		return 0;
+		}
+
+	if (!key)
+		{
+		const EC_GROUP *group;
+		group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
+		*keylen = (EC_GROUP_get_degree(group) + 7)/8;
+		return 1;
+		}
+
+	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
+
+	/* NB: unlike PKS#3 DH, if *outlen is less than maximum size this is
+	 * not an error, the result is truncated.
+	 */
+
+	outlen = *keylen;
+		
+	ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0);
+	if (ret < 0)
+		return ret;
+	*keylen = ret;
+	return 1;
+	}
+
+static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
+	{
+	EC_PKEY_CTX *dctx = ctx->data;
+	EC_GROUP *group;
+	switch (type)
+		{
+		case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
+		group = EC_GROUP_new_by_curve_name(p1);
+		if (group == NULL)
+			{
+			ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
+			return 0;
+			}
+		if (dctx->gen_group)
+			EC_GROUP_free(dctx->gen_group);
+		dctx->gen_group = group;
+		return 1;
+
+		case EVP_PKEY_CTRL_MD:
+		if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
+			{
+			ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
+			return 0;
+			}
+		dctx->md = p2;
+		return 1;
+
+		case EVP_PKEY_CTRL_PEER_KEY:
+		/* Default behaviour is OK */
+		case EVP_PKEY_CTRL_DIGESTINIT:
+		case EVP_PKEY_CTRL_PKCS7_SIGN:
+		case EVP_PKEY_CTRL_CMS_SIGN:
+		return 1;
+
+		default:
+		return -2;
+
+		}
+	}
+			
+static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
+			const char *type, const char *value)
+	{
+	if (!strcmp(type, "ec_paramgen_curve"))
+		{
+		int nid;
+		nid = OBJ_sn2nid(value);
+		if (nid == NID_undef)
+			nid = OBJ_ln2nid(value);
+		if (nid == NID_undef)
+			{
+			ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
+			return 0;
+			}
+		return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
+		}
+	return -2;
+	}
+
+static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+	{
+	EC_KEY *ec = NULL;
+	EC_PKEY_CTX *dctx = ctx->data;
+	int ret = 0;
+	if (dctx->gen_group == NULL)
+		{
+		ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
+		return 0;
+		}
+	ec = EC_KEY_new();
+	if (!ec)
+		return 0;
+	ret = EC_KEY_set_group(ec, dctx->gen_group);
+	if (ret)
+		EVP_PKEY_assign_EC_KEY(pkey, ec);
+	else
+		EC_KEY_free(ec);
+	return ret;
+	}
+
+static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+	{
+	EC_KEY *ec = NULL;
+	if (ctx->pkey == NULL)
+		{
+		ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
+		return 0;
+		}
+	ec = EC_KEY_new();
+	if (!ec)
+		return 0;
+	EVP_PKEY_assign_EC_KEY(pkey, ec);
+	/* Note: if error return, pkey is freed by parent routine */
+	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
+		return 0;
+	return EC_KEY_generate_key(pkey->pkey.ec);
+	}
+
+const EVP_PKEY_METHOD ec_pkey_meth = 
+	{
+	EVP_PKEY_EC,
+	0,
+	pkey_ec_init,
+	pkey_ec_copy,
+	pkey_ec_cleanup,
+
+	0,
+	pkey_ec_paramgen,
+
+	0,
+	pkey_ec_keygen,
+
+	0,
+	pkey_ec_sign,
+
+	0,
+	pkey_ec_verify,
+
+	0,0,
+
+	0,0,0,0,
+
+	0,0,
+
+	0,0,
+
+	0,
+	pkey_ec_derive,
+
+	pkey_ec_ctrl,
+	pkey_ec_ctrl_str
+
+	};