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332 lines
8.8 KiB
332 lines
8.8 KiB
/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project |
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* 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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/* 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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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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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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*siglen = ECDSA_size(ec); |
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return 1; |
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} else if (*siglen < (size_t)ECDSA_size(ec)) { |
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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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#ifndef OPENSSL_NO_ECDH |
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static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, |
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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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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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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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/* |
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* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not |
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* 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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#endif |
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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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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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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_ecdsa_with_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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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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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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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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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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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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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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#ifndef OPENSSL_NO_ECDH |
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pkey_ec_derive, |
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#else |
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0, |
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#endif |
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pkey_ec_ctrl, |
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pkey_ec_ctrl_str |
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};
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