Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 2 | * project 2006. |
| 3 | */ |
| 4 | /* ==================================================================== |
| 5 | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in |
| 16 | * the documentation and/or other materials provided with the |
| 17 | * distribution. |
| 18 | * |
| 19 | * 3. All advertising materials mentioning features or use of this |
| 20 | * software must display the following acknowledgment: |
| 21 | * "This product includes software developed by the OpenSSL Project |
| 22 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 23 | * |
| 24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 25 | * endorse or promote products derived from this software without |
| 26 | * prior written permission. For written permission, please contact |
| 27 | * licensing@OpenSSL.org. |
| 28 | * |
| 29 | * 5. Products derived from this software may not be called "OpenSSL" |
| 30 | * nor may "OpenSSL" appear in their names without prior written |
| 31 | * permission of the OpenSSL Project. |
| 32 | * |
| 33 | * 6. Redistributions of any form whatsoever must retain the following |
| 34 | * acknowledgment: |
| 35 | * "This product includes software developed by the OpenSSL Project |
| 36 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 37 | * |
| 38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 49 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 50 | * ==================================================================== |
| 51 | * |
| 52 | * This product includes cryptographic software written by Eric Young |
| 53 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 54 | * Hudson (tjh@cryptsoft.com). |
| 55 | * |
| 56 | */ |
| 57 | |
| 58 | #include <stdio.h> |
| 59 | #include "cryptlib.h" |
| 60 | #include <openssl/asn1t.h> |
| 61 | #include <openssl/x509.h> |
| 62 | #include <openssl/evp.h> |
| 63 | #include <openssl/dh.h> |
| 64 | #include <openssl/bn.h> |
| 65 | #include "evp_locl.h" |
| 66 | |
| 67 | /* DH pkey context structure */ |
| 68 | |
| 69 | typedef struct |
| 70 | { |
| 71 | /* Parameter gen parameters */ |
| 72 | int prime_len; |
| 73 | int generator; |
| 74 | int use_dsa; |
| 75 | /* Keygen callback info */ |
| 76 | int gentmp[2]; |
| 77 | /* message digest */ |
| 78 | } DH_PKEY_CTX; |
| 79 | |
| 80 | static int pkey_dh_init(EVP_PKEY_CTX *ctx) |
| 81 | { |
| 82 | DH_PKEY_CTX *dctx; |
| 83 | dctx = OPENSSL_malloc(sizeof(DH_PKEY_CTX)); |
| 84 | if (!dctx) |
| 85 | return 0; |
| 86 | dctx->prime_len = 1024; |
| 87 | dctx->generator = 2; |
| 88 | dctx->use_dsa = 0; |
| 89 | |
| 90 | ctx->data = dctx; |
| 91 | ctx->keygen_info = dctx->gentmp; |
| 92 | ctx->keygen_info_count = 2; |
| 93 | |
| 94 | return 1; |
| 95 | } |
| 96 | |
| 97 | static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) |
| 98 | { |
| 99 | DH_PKEY_CTX *dctx, *sctx; |
| 100 | if (!pkey_dh_init(dst)) |
| 101 | return 0; |
| 102 | sctx = src->data; |
| 103 | dctx = dst->data; |
| 104 | dctx->prime_len = sctx->prime_len; |
| 105 | dctx->generator = sctx->generator; |
| 106 | dctx->use_dsa = sctx->use_dsa; |
| 107 | return 1; |
| 108 | } |
| 109 | |
| 110 | static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx) |
| 111 | { |
| 112 | DH_PKEY_CTX *dctx = ctx->data; |
| 113 | if (dctx) |
| 114 | OPENSSL_free(dctx); |
| 115 | } |
| 116 | |
| 117 | static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| 118 | { |
| 119 | DH_PKEY_CTX *dctx = ctx->data; |
| 120 | switch (type) |
| 121 | { |
| 122 | case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN: |
| 123 | if (p1 < 256) |
| 124 | return -2; |
| 125 | dctx->prime_len = p1; |
| 126 | return 1; |
| 127 | |
| 128 | case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR: |
| 129 | dctx->generator = p1; |
| 130 | return 1; |
| 131 | |
| 132 | case EVP_PKEY_CTRL_PEER_KEY: |
| 133 | /* Default behaviour is OK */ |
| 134 | return 1; |
| 135 | |
| 136 | default: |
| 137 | return -2; |
| 138 | |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | |
| 143 | static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx, |
| 144 | const char *type, const char *value) |
| 145 | { |
| 146 | if (!strcmp(type, "dh_paramgen_prime_len")) |
| 147 | { |
| 148 | int len; |
| 149 | len = atoi(value); |
| 150 | return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len); |
| 151 | } |
| 152 | if (!strcmp(type, "dh_paramgen_generator")) |
| 153 | { |
| 154 | int len; |
| 155 | len = atoi(value); |
| 156 | return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len); |
| 157 | } |
| 158 | return -2; |
| 159 | } |
| 160 | |
| 161 | static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 162 | { |
| 163 | DH *dh = NULL; |
| 164 | DH_PKEY_CTX *dctx = ctx->data; |
| 165 | BN_GENCB *pcb, cb; |
| 166 | int ret; |
| 167 | if (ctx->pkey_gencb) |
| 168 | { |
| 169 | pcb = &cb; |
| 170 | evp_pkey_set_cb_translate(pcb, ctx); |
| 171 | } |
| 172 | else |
| 173 | pcb = NULL; |
| 174 | dh = DH_new(); |
| 175 | if (!dh) |
| 176 | return 0; |
| 177 | ret = DH_generate_parameters_ex(dh, |
| 178 | dctx->prime_len, dctx->generator, pcb); |
| 179 | if (ret) |
| 180 | EVP_PKEY_assign_DH(pkey, dh); |
| 181 | else |
| 182 | DH_free(dh); |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) |
| 187 | { |
| 188 | DH *dh = NULL; |
| 189 | if (ctx->pkey == NULL) |
| 190 | { |
| 191 | DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET); |
| 192 | return 0; |
| 193 | } |
| 194 | dh = DH_new(); |
| 195 | if (!dh) |
| 196 | return 0; |
| 197 | EVP_PKEY_assign_DH(pkey, dh); |
| 198 | /* Note: if error return, pkey is freed by parent routine */ |
| 199 | if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) |
| 200 | return 0; |
| 201 | return DH_generate_key(pkey->pkey.dh); |
| 202 | } |
| 203 | |
| 204 | static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) |
| 205 | { |
| 206 | int ret; |
| 207 | if (!ctx->pkey || !ctx->peerkey) |
| 208 | { |
| 209 | DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET); |
| 210 | return 0; |
| 211 | } |
| 212 | ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key, |
| 213 | ctx->pkey->pkey.dh); |
| 214 | if (ret < 0) |
| 215 | return ret; |
| 216 | *keylen = ret; |
| 217 | return 1; |
| 218 | } |
| 219 | |
| 220 | const EVP_PKEY_METHOD dh_pkey_meth = |
| 221 | { |
| 222 | EVP_PKEY_DH, |
| 223 | EVP_PKEY_FLAG_AUTOARGLEN, |
| 224 | pkey_dh_init, |
| 225 | pkey_dh_copy, |
| 226 | pkey_dh_cleanup, |
| 227 | |
| 228 | 0, |
| 229 | pkey_dh_paramgen, |
| 230 | |
| 231 | 0, |
| 232 | pkey_dh_keygen, |
| 233 | |
| 234 | 0, |
| 235 | 0, |
| 236 | |
| 237 | 0, |
| 238 | 0, |
| 239 | |
| 240 | 0,0, |
| 241 | |
| 242 | 0,0,0,0, |
| 243 | |
| 244 | 0,0, |
| 245 | |
| 246 | 0,0, |
| 247 | |
| 248 | 0, |
| 249 | pkey_dh_derive, |
| 250 | |
| 251 | pkey_dh_ctrl, |
| 252 | pkey_dh_ctrl_str |
| 253 | |
| 254 | }; |