diff options
Diffstat (limited to 'openssl/crypto/dh/dh_pmeth.c')
| -rw-r--r-- | openssl/crypto/dh/dh_pmeth.c | 551 |
1 files changed, 551 insertions, 0 deletions
diff --git a/openssl/crypto/dh/dh_pmeth.c b/openssl/crypto/dh/dh_pmeth.c new file mode 100644 index 0000000..b58e3fa --- /dev/null +++ b/openssl/crypto/dh/dh_pmeth.c @@ -0,0 +1,551 @@ +/* + * 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> +#ifndef OPENSSL_NO_DSA +# include <openssl/dsa.h> +#endif +#include <openssl/objects.h> +#include "evp_locl.h" + +/* DH pkey context structure */ + +typedef struct { + /* Parameter gen parameters */ + int prime_len; + int generator; + int use_dsa; + int subprime_len; + /* message digest used for parameter generation */ + const EVP_MD *md; + int rfc5114_param; + /* Keygen callback info */ + int gentmp[2]; + /* KDF (if any) to use for DH */ + char kdf_type; + /* OID to use for KDF */ + ASN1_OBJECT *kdf_oid; + /* Message digest to use for key derivation */ + const EVP_MD *kdf_md; + /* User key material */ + unsigned char *kdf_ukm; + size_t kdf_ukmlen; + /* KDF output length */ + size_t kdf_outlen; +} 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->subprime_len = -1; + dctx->generator = 2; + dctx->use_dsa = 0; + dctx->md = NULL; + dctx->rfc5114_param = 0; + + dctx->kdf_type = EVP_PKEY_DH_KDF_NONE; + dctx->kdf_oid = NULL; + dctx->kdf_md = NULL; + dctx->kdf_ukm = NULL; + dctx->kdf_ukmlen = 0; + dctx->kdf_outlen = 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->subprime_len = sctx->subprime_len; + dctx->generator = sctx->generator; + dctx->use_dsa = sctx->use_dsa; + dctx->md = sctx->md; + dctx->rfc5114_param = sctx->rfc5114_param; + + dctx->kdf_type = sctx->kdf_type; + dctx->kdf_oid = OBJ_dup(sctx->kdf_oid); + if (!dctx->kdf_oid) + return 0; + dctx->kdf_md = sctx->kdf_md; + if (dctx->kdf_ukm) { + dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen); + dctx->kdf_ukmlen = sctx->kdf_ukmlen; + } + dctx->kdf_outlen = sctx->kdf_outlen; + return 1; +} + +static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx) +{ + DH_PKEY_CTX *dctx = ctx->data; + if (dctx) { + if (dctx->kdf_ukm) + OPENSSL_free(dctx->kdf_ukm); + if (dctx->kdf_oid) + ASN1_OBJECT_free(dctx->kdf_oid); + 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_SUBPRIME_LEN: + if (dctx->use_dsa == 0) + return -2; + dctx->subprime_len = p1; + return 1; + + case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR: + if (dctx->use_dsa) + return -2; + dctx->generator = p1; + return 1; + + case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE: +#ifdef OPENSSL_NO_DSA + if (p1 != 0) + return -2; +#else + if (p1 < 0 || p1 > 2) + return -2; +#endif + dctx->use_dsa = p1; + return 1; + + case EVP_PKEY_CTRL_DH_RFC5114: + if (p1 < 1 || p1 > 3) + return -2; + dctx->rfc5114_param = p1; + return 1; + + case EVP_PKEY_CTRL_PEER_KEY: + /* Default behaviour is OK */ + return 1; + + case EVP_PKEY_CTRL_DH_KDF_TYPE: + if (p1 == -2) + return dctx->kdf_type; + if (p1 != EVP_PKEY_DH_KDF_NONE && p1 != EVP_PKEY_DH_KDF_X9_42) + return -2; + dctx->kdf_type = p1; + return 1; + + case EVP_PKEY_CTRL_DH_KDF_MD: + dctx->kdf_md = p2; + return 1; + + case EVP_PKEY_CTRL_GET_DH_KDF_MD: + *(const EVP_MD **)p2 = dctx->kdf_md; + return 1; + + case EVP_PKEY_CTRL_DH_KDF_OUTLEN: + if (p1 <= 0) + return -2; + dctx->kdf_outlen = (size_t)p1; + return 1; + + case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN: + *(int *)p2 = dctx->kdf_outlen; + return 1; + + case EVP_PKEY_CTRL_DH_KDF_UKM: + if (dctx->kdf_ukm) + OPENSSL_free(dctx->kdf_ukm); + dctx->kdf_ukm = p2; + if (p2) + dctx->kdf_ukmlen = p1; + else + dctx->kdf_ukmlen = 0; + return 1; + + case EVP_PKEY_CTRL_GET_DH_KDF_UKM: + *(unsigned char **)p2 = dctx->kdf_ukm; + return dctx->kdf_ukmlen; + + case EVP_PKEY_CTRL_DH_KDF_OID: + if (dctx->kdf_oid) + ASN1_OBJECT_free(dctx->kdf_oid); + dctx->kdf_oid = p2; + return 1; + + case EVP_PKEY_CTRL_GET_DH_KDF_OID: + *(ASN1_OBJECT **)p2 = dctx->kdf_oid; + 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_rfc5114")) { + DH_PKEY_CTX *dctx = ctx->data; + int len; + len = atoi(value); + if (len < 0 || len > 3) + return -2; + dctx->rfc5114_param = len; + return 1; + } + if (!strcmp(type, "dh_paramgen_generator")) { + int len; + len = atoi(value); + return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len); + } + if (!strcmp(type, "dh_paramgen_subprime_len")) { + int len; + len = atoi(value); + return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len); + } + if (!strcmp(type, "dh_paramgen_type")) { + int typ; + typ = atoi(value); + return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ); + } + return -2; +} + +#ifndef OPENSSL_NO_DSA + +extern int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits, + const EVP_MD *evpmd, + const unsigned char *seed_in, size_t seed_len, + unsigned char *seed_out, int *counter_ret, + unsigned long *h_ret, BN_GENCB *cb); + +extern int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N, + const EVP_MD *evpmd, + const unsigned char *seed_in, + size_t seed_len, int idx, + unsigned char *seed_out, int *counter_ret, + unsigned long *h_ret, BN_GENCB *cb); + +static DSA *dsa_dh_generate(DH_PKEY_CTX *dctx, BN_GENCB *pcb) +{ + DSA *ret; + int rv = 0; + int prime_len = dctx->prime_len; + int subprime_len = dctx->subprime_len; + const EVP_MD *md = dctx->md; + if (dctx->use_dsa > 2) + return NULL; + ret = DSA_new(); + if (!ret) + return NULL; + if (subprime_len == -1) { + if (prime_len >= 2048) + subprime_len = 256; + else + subprime_len = 160; + } + if (md == NULL) { + if (prime_len >= 2048) + md = EVP_sha256(); + else + md = EVP_sha1(); + } + if (dctx->use_dsa == 1) + rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md, + NULL, 0, NULL, NULL, NULL, pcb); + else if (dctx->use_dsa == 2) + rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md, + NULL, 0, -1, NULL, NULL, NULL, pcb); + if (rv <= 0) { + DSA_free(ret); + return NULL; + } + return ret; +} + +#endif + +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 (dctx->rfc5114_param) { + switch (dctx->rfc5114_param) { + case 1: + dh = DH_get_1024_160(); + break; + + case 2: + dh = DH_get_2048_224(); + break; + + case 3: + dh = DH_get_2048_256(); + break; + + default: + return -2; + } + EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh); + return 1; + } + + if (ctx->pkey_gencb) { + pcb = &cb; + evp_pkey_set_cb_translate(pcb, ctx); + } else + pcb = NULL; +#ifndef OPENSSL_NO_DSA + if (dctx->use_dsa) { + DSA *dsa_dh; + dsa_dh = dsa_dh_generate(dctx, pcb); + if (!dsa_dh) + return 0; + dh = DSA_dup_DH(dsa_dh); + DSA_free(dsa_dh); + if (!dh) + return 0; + EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh); + return 1; + } +#endif + 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(pkey, ctx->pmeth->pkey_id, 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; + DH *dh; + DH_PKEY_CTX *dctx = ctx->data; + BIGNUM *dhpub; + if (!ctx->pkey || !ctx->peerkey) { + DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET); + return 0; + } + dh = ctx->pkey->pkey.dh; + dhpub = ctx->peerkey->pkey.dh->pub_key; + if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE) { + if (key == NULL) { + *keylen = DH_size(dh); + return 1; + } + ret = DH_compute_key(key, dhpub, dh); + if (ret < 0) + return ret; + *keylen = ret; + return 1; + } else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42) { + unsigned char *Z = NULL; + size_t Zlen = 0; + if (!dctx->kdf_outlen || !dctx->kdf_oid) + return 0; + if (key == NULL) { + *keylen = dctx->kdf_outlen; + return 1; + } + if (*keylen != dctx->kdf_outlen) + return 0; + ret = 0; + Zlen = DH_size(dh); + Z = OPENSSL_malloc(Zlen); + if (!Z) { + goto err; + } + if (DH_compute_key_padded(Z, dhpub, dh) <= 0) + goto err; + if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid, + dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md)) + goto err; + *keylen = dctx->kdf_outlen; + ret = 1; + err: + if (Z) { + OPENSSL_cleanse(Z, Zlen); + OPENSSL_free(Z); + } + return ret; + } + return 1; +} + +const EVP_PKEY_METHOD dh_pkey_meth = { + EVP_PKEY_DH, + 0, + 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 +}; + +const EVP_PKEY_METHOD dhx_pkey_meth = { + EVP_PKEY_DHX, + 0, + 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 +}; |