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340 lines
7.9 KiB
340 lines
7.9 KiB
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/evp.h>
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#include "evp_locl.h"
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/* EC pkey context structure */
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typedef struct
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{
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/* Key and paramgen group */
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EC_GROUP *gen_group;
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/* message digest */
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const EVP_MD *md;
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} EC_PKEY_CTX;
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static int pkey_ec_init(EVP_PKEY_CTX *ctx)
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{
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EC_PKEY_CTX *dctx;
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dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
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if (!dctx)
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return 0;
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dctx->gen_group = NULL;
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dctx->md = NULL;
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ctx->data = dctx;
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return 1;
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}
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static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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EC_PKEY_CTX *dctx, *sctx;
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if (!pkey_ec_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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if (sctx->gen_group)
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{
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dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
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if (!dctx->gen_group)
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return 0;
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}
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dctx->md = sctx->md;
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return 1;
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}
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static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
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{
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EC_PKEY_CTX *dctx = ctx->data;
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if (dctx)
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{
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if (dctx->gen_group)
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EC_GROUP_free(dctx->gen_group);
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OPENSSL_free(dctx);
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}
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}
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static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret, type;
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unsigned int sltmp;
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EC_PKEY_CTX *dctx = ctx->data;
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EC_KEY *ec = ctx->pkey->pkey.ec;
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if (!sig)
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{
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*siglen = ECDSA_size(ec);
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return 1;
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}
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else if(*siglen < (size_t)ECDSA_size(ec))
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{
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ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
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return 0;
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}
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if (dctx->md)
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type = EVP_MD_type(dctx->md);
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else
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type = NID_sha1;
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ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
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if (ret <= 0)
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return ret;
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*siglen = (size_t)sltmp;
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return 1;
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}
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static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
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const unsigned char *sig, size_t siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret, type;
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EC_PKEY_CTX *dctx = ctx->data;
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EC_KEY *ec = ctx->pkey->pkey.ec;
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if (dctx->md)
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type = EVP_MD_type(dctx->md);
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else
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type = NID_sha1;
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ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
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return ret;
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}
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static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
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{
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int ret;
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size_t outlen;
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const EC_POINT *pubkey = NULL;
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if (!ctx->pkey || !ctx->peerkey)
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{
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ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
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return 0;
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}
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if (!key)
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{
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const EC_GROUP *group;
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group = EC_KEY_get0_group(ctx->pkey->pkey.ec);
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*keylen = (EC_GROUP_get_degree(group) + 7)/8;
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return 1;
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}
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pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
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/* NB: unlike PKS#3 DH, if *outlen is less than maximum size this is
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* not an error, the result is truncated.
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*/
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outlen = *keylen;
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ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0);
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if (ret < 0)
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return ret;
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*keylen = ret;
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return 1;
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}
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static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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EC_PKEY_CTX *dctx = ctx->data;
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EC_GROUP *group;
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switch (type)
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{
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case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
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group = EC_GROUP_new_by_curve_name(p1);
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if (group == NULL)
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{
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ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
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return 0;
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}
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if (dctx->gen_group)
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EC_GROUP_free(dctx->gen_group);
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dctx->gen_group = group;
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return 1;
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case EVP_PKEY_CTRL_MD:
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if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
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{
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ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
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return 0;
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}
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dctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_PEER_KEY:
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/* Default behaviour is OK */
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case EVP_PKEY_CTRL_DIGESTINIT:
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case EVP_PKEY_CTRL_PKCS7_SIGN:
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case EVP_PKEY_CTRL_CMS_SIGN:
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return 1;
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default:
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return -2;
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}
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}
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static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (!strcmp(type, "ec_paramgen_curve"))
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{
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int nid;
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nid = OBJ_sn2nid(value);
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if (nid == NID_undef)
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nid = OBJ_ln2nid(value);
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if (nid == NID_undef)
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{
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ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
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return 0;
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}
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return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
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}
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return -2;
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}
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static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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EC_KEY *ec = NULL;
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EC_PKEY_CTX *dctx = ctx->data;
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int ret = 0;
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if (dctx->gen_group == NULL)
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{
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ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
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return 0;
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}
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ec = EC_KEY_new();
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if (!ec)
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return 0;
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ret = EC_KEY_set_group(ec, dctx->gen_group);
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if (ret)
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EVP_PKEY_assign_EC_KEY(pkey, ec);
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else
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EC_KEY_free(ec);
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return ret;
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}
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static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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EC_KEY *ec = NULL;
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if (ctx->pkey == NULL)
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{
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ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
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return 0;
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}
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ec = EC_KEY_new();
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if (!ec)
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return 0;
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EVP_PKEY_assign_EC_KEY(pkey, ec);
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/* Note: if error return, pkey is freed by parent routine */
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if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
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return 0;
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return EC_KEY_generate_key(pkey->pkey.ec);
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}
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const EVP_PKEY_METHOD ec_pkey_meth =
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{
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EVP_PKEY_EC,
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0,
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pkey_ec_init,
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pkey_ec_copy,
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pkey_ec_cleanup,
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0,
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pkey_ec_paramgen,
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0,
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pkey_ec_keygen,
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0,
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pkey_ec_sign,
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0,
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pkey_ec_verify,
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0,0,
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0,0,0,0,
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0,0,
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0,0,
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0,
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pkey_ec_derive,
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pkey_ec_ctrl,
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pkey_ec_ctrl_str
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};
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