/* 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 #include #include #include #include #include #include #include #include #include #include #include #include "internal.h" #include "../ec/internal.h" typedef struct { /* 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; } memset(dctx, 0, sizeof(EC_PKEY_CTX)); 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; dctx->md = sctx->md; return 1; } static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) { EC_PKEY_CTX *dctx = ctx->data; if (!dctx) { return; } OPENSSL_free(dctx); } static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen, const uint8_t *tbs, size_t tbslen) { unsigned int sltmp; EC_KEY *ec = ctx->pkey->pkey.ec; if (!sig) { *siglen = ECDSA_size(ec); return 1; } else if (*siglen < (size_t)ECDSA_size(ec)) { OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL); return 0; } if (!ECDSA_sign(0, tbs, tbslen, sig, &sltmp, ec)) { return 0; } *siglen = (size_t)sltmp; return 1; } static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen, const uint8_t *tbs, size_t tbslen) { return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->pkey->pkey.ec); } static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key, size_t *keylen) { int ret; size_t outlen; const EC_POINT *pubkey = NULL; EC_KEY *eckey; if (!ctx->pkey || !ctx->peerkey) { OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET); return 0; } eckey = ctx->pkey->pkey.ec; if (!key) { const EC_GROUP *group; group = EC_KEY_get0_group(eckey); *keylen = (EC_GROUP_get_degree(group) + 7) / 8; return 1; } pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec); /* NB: unlike PKCS#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, eckey, 0); if (ret < 0) { return 0; } *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; switch (type) { case EVP_PKEY_CTRL_MD: if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_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) { OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_DIGEST_TYPE); return 0; } dctx->md = p2; return 1; case EVP_PKEY_CTRL_GET_MD: *(const EVP_MD **)p2 = dctx->md; return 1; case EVP_PKEY_CTRL_PEER_KEY: /* Default behaviour is OK */ return 1; default: OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED); return 0; } } static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { if (ctx->pkey == NULL) { OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET); return 0; } EC_KEY *ec = EC_KEY_new(); if (ec == NULL || !EC_KEY_set_group(ec, EC_KEY_get0_group(ctx->pkey->pkey.ec)) || !EC_KEY_generate_key(ec)) { EC_KEY_free(ec); return 0; } EVP_PKEY_assign_EC_KEY(pkey, ec); return 1; } const EVP_PKEY_METHOD ec_pkey_meth = { EVP_PKEY_EC, pkey_ec_init, pkey_ec_copy, pkey_ec_cleanup, pkey_ec_keygen, pkey_ec_sign, pkey_ec_verify, 0 /* verify_recover */, 0 /* encrypt */, 0 /* decrypt */, pkey_ec_derive, pkey_ec_ctrl, };