diff options
Diffstat (limited to 'crypto/dh/dh_pmeth.c')
| -rw-r--r-- | crypto/dh/dh_pmeth.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/crypto/dh/dh_pmeth.c b/crypto/dh/dh_pmeth.c new file mode 100644 index 0000000000000..5ae72b7d4cc27 --- /dev/null +++ b/crypto/dh/dh_pmeth.c @@ -0,0 +1,254 @@ +/* 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/evp.h> +#include <openssl/dh.h> +#include <openssl/bn.h> +#include "evp_locl.h" + +/* DH pkey context structure */ + +typedef struct + { + /* Parameter gen parameters */ + int prime_len; + int generator; + int use_dsa; + /* Keygen callback info */ + int gentmp[2]; + /* message digest */ + } DH_PKEY_CTX; + +static int pkey_dh_init(EVP_PKEY_CTX *ctx) + { + DH_PKEY_CTX *dctx; + dctx = OPENSSL_malloc(sizeof(DH_PKEY_CTX)); + if (!dctx) + return 0; + dctx->prime_len = 1024; + dctx->generator = 2; + dctx->use_dsa = 0; + + ctx->data = dctx; + ctx->keygen_info = dctx->gentmp; + ctx->keygen_info_count = 2; + + return 1; + } + +static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) + { + DH_PKEY_CTX *dctx, *sctx; + if (!pkey_dh_init(dst)) + return 0; + sctx = src->data; + dctx = dst->data; + dctx->prime_len = sctx->prime_len; + dctx->generator = sctx->generator; + dctx->use_dsa = sctx->use_dsa; + return 1; + } + +static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx) + { + DH_PKEY_CTX *dctx = ctx->data; + if (dctx) + OPENSSL_free(dctx); + } + +static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) + { + DH_PKEY_CTX *dctx = ctx->data; + switch (type) + { + case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN: + if (p1 < 256) + return -2; + dctx->prime_len = p1; + return 1; + + case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR: + dctx->generator = p1; + return 1; + + case EVP_PKEY_CTRL_PEER_KEY: + /* Default behaviour is OK */ + return 1; + + default: + return -2; + + } + } + + +static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx, + const char *type, const char *value) + { + if (!strcmp(type, "dh_paramgen_prime_len")) + { + int len; + len = atoi(value); + return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len); + } + if (!strcmp(type, "dh_paramgen_generator")) + { + int len; + len = atoi(value); + return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len); + } + return -2; + } + +static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) + { + DH *dh = NULL; + DH_PKEY_CTX *dctx = ctx->data; + BN_GENCB *pcb, cb; + int ret; + if (ctx->pkey_gencb) + { + pcb = &cb; + evp_pkey_set_cb_translate(pcb, ctx); + } + else + pcb = NULL; + dh = DH_new(); + if (!dh) + return 0; + ret = DH_generate_parameters_ex(dh, + dctx->prime_len, dctx->generator, pcb); + if (ret) + EVP_PKEY_assign_DH(pkey, dh); + else + DH_free(dh); + return ret; + } + +static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) + { + DH *dh = NULL; + if (ctx->pkey == NULL) + { + DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET); + return 0; + } + dh = DH_new(); + if (!dh) + return 0; + EVP_PKEY_assign_DH(pkey, dh); + /* Note: if error return, pkey is freed by parent routine */ + if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) + return 0; + return DH_generate_key(pkey->pkey.dh); + } + +static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) + { + int ret; + if (!ctx->pkey || !ctx->peerkey) + { + DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET); + return 0; + } + ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key, + ctx->pkey->pkey.dh); + if (ret < 0) + return ret; + *keylen = ret; + return 1; + } + +const EVP_PKEY_METHOD dh_pkey_meth = + { + EVP_PKEY_DH, + EVP_PKEY_FLAG_AUTOARGLEN, + pkey_dh_init, + pkey_dh_copy, + pkey_dh_cleanup, + + 0, + pkey_dh_paramgen, + + 0, + pkey_dh_keygen, + + 0, + 0, + + 0, + 0, + + 0,0, + + 0,0,0,0, + + 0,0, + + 0,0, + + 0, + pkey_dh_derive, + + pkey_dh_ctrl, + pkey_dh_ctrl_str + + }; |