X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fevp%2Fevp_lib.c;h=47bbb2bd5582003d888b6fbb297d8560ac5f1c38;hp=50f12b4323625ad8a755251fb0101260c11400ee;hb=76ca35e7246b0071040cd242de06154c0195bcff;hpb=3dcb9e4e0fb8d6ee373c44013141452e79da30cc diff --git a/crypto/evp/evp_lib.c b/crypto/evp/evp_lib.c index 50f12b4323..47bbb2bd55 100644 --- a/crypto/evp/evp_lib.c +++ b/crypto/evp/evp_lib.c @@ -1,78 +1,49 @@ -/* crypto/evp/evp_lib.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * 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 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 acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS 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 AUTHOR OR 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. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ #include #include "internal/cryptlib.h" #include #include +#include +#include +#include #include "internal/evp_int.h" +#include "internal/provider.h" #include "evp_locl.h" +#if !defined(FIPS_MODE) int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type) { int ret; + const EVP_CIPHER *cipher = c->cipher; + + if (cipher->prov != NULL) { + /* + * The cipher has come from a provider and won't have the default flags. + * Find the implicit form so we can check the flags. + * TODO(3.0): This won't work for 3rd party ciphers we know nothing about + * We'll need to think of something else for those. + */ + cipher = EVP_get_cipherbynid(cipher->nid); + if (cipher == NULL) { + EVPerr(EVP_F_EVP_CIPHER_PARAM_TO_ASN1, ASN1_R_UNSUPPORTED_CIPHER); + return -1; + } + } - if (c->cipher->set_asn1_parameters != NULL) - ret = c->cipher->set_asn1_parameters(c, type); - else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) { - switch (EVP_CIPHER_CTX_mode(c)) { + if (cipher->set_asn1_parameters != NULL) + ret = cipher->set_asn1_parameters(c, type); + else if (cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) { + switch (EVP_CIPHER_mode(cipher)) { case EVP_CIPH_WRAP_MODE: - if (EVP_CIPHER_CTX_nid(c) == NID_id_smime_alg_CMS3DESwrap) + if (EVP_CIPHER_nid(cipher) == NID_id_smime_alg_CMS3DESwrap) ASN1_TYPE_set(type, V_ASN1_NULL, NULL); ret = 1; break; @@ -81,7 +52,7 @@ int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type) case EVP_CIPH_CCM_MODE: case EVP_CIPH_XTS_MODE: case EVP_CIPH_OCB_MODE: - ret = -1; + ret = -2; break; default: @@ -89,17 +60,34 @@ int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type) } } else ret = -1; - return (ret); + if (ret <= 0) + EVPerr(EVP_F_EVP_CIPHER_PARAM_TO_ASN1, ret == -2 ? + ASN1_R_UNSUPPORTED_CIPHER : + EVP_R_CIPHER_PARAMETER_ERROR); + if (ret < -1) + ret = -1; + return ret; } int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type) { int ret; + const EVP_CIPHER *cipher = c->cipher; + + if (cipher->prov != NULL) { + /* + * The cipher has come from a provider and won't have the default flags. + * Find the implicit form so we can check the flags. + */ + cipher = EVP_get_cipherbynid(cipher->nid); + if (cipher == NULL) + return -1; + } - if (c->cipher->get_asn1_parameters != NULL) - ret = c->cipher->get_asn1_parameters(c, type); - else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) { - switch (EVP_CIPHER_CTX_mode(c)) { + if (cipher->get_asn1_parameters != NULL) + ret = cipher->get_asn1_parameters(c, type); + else if (cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1) { + switch (EVP_CIPHER_mode(cipher)) { case EVP_CIPH_WRAP_MODE: ret = 1; @@ -109,7 +97,7 @@ int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type) case EVP_CIPH_CCM_MODE: case EVP_CIPH_XTS_MODE: case EVP_CIPH_OCB_MODE: - ret = -1; + ret = -2; break; default: @@ -118,24 +106,34 @@ int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type) } } else ret = -1; - return (ret); + if (ret <= 0) + EVPerr(EVP_F_EVP_CIPHER_ASN1_TO_PARAM, ret == -2 ? + EVP_R_UNSUPPORTED_CIPHER : + EVP_R_CIPHER_PARAMETER_ERROR); + if (ret < -1) + ret = -1; + return ret; } -int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) +int EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *ctx, ASN1_TYPE *type) { int i = 0; unsigned int l; if (type != NULL) { - l = EVP_CIPHER_CTX_iv_length(c); - OPENSSL_assert(l <= sizeof(c->iv)); - i = ASN1_TYPE_get_octetstring(type, c->oiv, l); + unsigned char iv[EVP_MAX_IV_LENGTH]; + + l = EVP_CIPHER_CTX_iv_length(ctx); + if (!ossl_assert(l <= sizeof(iv))) + return -1; + i = ASN1_TYPE_get_octetstring(type, iv, l); if (i != (int)l) - return (-1); - else if (i > 0) - memcpy(c->iv, c->oiv, l); + return -1; + + if (!EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, -1)) + return -1; } - return (i); + return i; } int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) @@ -148,14 +146,14 @@ int EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type) OPENSSL_assert(j <= sizeof(c->iv)); i = ASN1_TYPE_set_octetstring(type, c->oiv, j); } - return (i); + return i; } +#endif /* !defined(FIPS_MODE) */ /* Convert the various cipher NIDs and dummies to a proper OID NID */ int EVP_CIPHER_type(const EVP_CIPHER *ctx) { int nid; - ASN1_OBJECT *otmp; nid = EVP_CIPHER_nid(ctx); switch (nid) { @@ -202,23 +200,36 @@ int EVP_CIPHER_type(const EVP_CIPHER *ctx) return NID_des_cfb64; default: - /* Check it has an OID and it is valid */ - otmp = OBJ_nid2obj(nid); - if (OBJ_get0_data(otmp) == NULL) - nid = NID_undef; - ASN1_OBJECT_free(otmp); - return nid; +#ifdef FIPS_MODE + return NID_undef; +#else + { + /* Check it has an OID and it is valid */ + ASN1_OBJECT *otmp = OBJ_nid2obj(nid); + + if (OBJ_get0_data(otmp) == NULL) + nid = NID_undef; + ASN1_OBJECT_free(otmp); + return nid; + } +#endif } } -int EVP_CIPHER_block_size(const EVP_CIPHER *e) +int EVP_CIPHER_block_size(const EVP_CIPHER *cipher) { - return e->block_size; + int ok, v = cipher->block_size; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_BLOCK_SIZE, &v); + ok = evp_do_ciph_getparams(cipher, params); + + return ok != 0 ? v : -1; } int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx) { - return ctx->cipher->block_size; + return EVP_CIPHER_block_size(ctx->cipher); } int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *e) @@ -229,6 +240,18 @@ int EVP_CIPHER_impl_ctx_size(const EVP_CIPHER *e) int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl) { + if (ctx->cipher->prov != NULL) { + size_t outl = 0; /* ignored */ + int blocksize = EVP_CIPHER_CTX_block_size(ctx); + + if (ctx->cipher->ccipher != NULL) + return + ctx->cipher->ccipher(ctx->provctx, out, &outl, + inl + (blocksize == 1 ? 0 : blocksize), + in, (size_t)inl); + return 0; + } + return ctx->cipher->do_cipher(ctx, out, in, inl); } @@ -244,7 +267,14 @@ int EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx) unsigned long EVP_CIPHER_flags(const EVP_CIPHER *cipher) { - return cipher->flags; + int ok; + unsigned long v = cipher->flags; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_ulong(OSSL_CIPHER_PARAM_FLAGS, &v); + ok = evp_do_ciph_getparams(cipher, params); + + return ok != 0 ? v : 0; } void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx) @@ -257,19 +287,35 @@ void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data) ctx->app_data = data; } -void *EVP_CIPHER_CTX_cipher_data(const EVP_CIPHER_CTX *ctx) +void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx) { return ctx->cipher_data; } +void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data) +{ + void *old_cipher_data; + + old_cipher_data = ctx->cipher_data; + ctx->cipher_data = cipher_data; + + return old_cipher_data; +} + int EVP_CIPHER_iv_length(const EVP_CIPHER *cipher) { - return cipher->iv_len; + int ok, v = cipher->iv_len; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_IVLEN, &v); + ok = evp_do_ciph_getparams(cipher, params); + + return ok != 0 ? v : -1; } int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) { - return ctx->cipher->iv_len; + return EVP_CIPHER_iv_length(ctx->cipher); } const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx) @@ -277,14 +323,35 @@ const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx) return ctx->oiv; } +/* + * OSSL_PARAM_OCTET_PTR gets us the pointer to the running IV in the provider + */ const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx) { - return ctx->iv; + int ok; + const unsigned char *v = ctx->iv; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = + OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v, + sizeof(ctx->iv)); + ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params); + + return ok != 0 ? v : NULL; } unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx) { - return ctx->iv; + int ok; + unsigned char *v = ctx->iv; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = + OSSL_PARAM_construct_octet_ptr(OSSL_CIPHER_PARAM_IV, (void **)&v, + sizeof(ctx->iv)); + ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params); + + return ok != 0 ? v : NULL; } unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx) @@ -294,22 +361,48 @@ unsigned char *EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx) int EVP_CIPHER_CTX_num(const EVP_CIPHER_CTX *ctx) { - return ctx->num; + int ok, v = ctx->num; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_NUM, &v); + ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params); + + return ok != 0 ? v : -1; } -void EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num) +int EVP_CIPHER_CTX_set_num(EVP_CIPHER_CTX *ctx, int num) { - ctx->num = num; + int ok; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_NUM, &num); + ok = evp_do_ciph_ctx_setparams(ctx->cipher, ctx->provctx, params); + + if (ok != 0) + ctx->num = num; + return ok != 0; } int EVP_CIPHER_key_length(const EVP_CIPHER *cipher) { - return cipher->key_len; + int ok, v = cipher->key_len; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &v); + ok = evp_do_ciph_getparams(cipher, params); + + return ok != 0 ? v : -1; } int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx) { - return ctx->key_len; + int ok, v = ctx->key_len; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_KEYLEN, &v); + ok = evp_do_ciph_ctx_getparams(ctx->cipher, ctx->provctx, params); + + return ok != 0 ? v : -1; } int EVP_CIPHER_nid(const EVP_CIPHER *cipher) @@ -322,8 +415,27 @@ int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx) return ctx->cipher->nid; } +int EVP_CIPHER_mode(const EVP_CIPHER *cipher) +{ + int ok, v = EVP_CIPHER_flags(cipher) & EVP_CIPH_MODE; + OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; + + params[0] = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_MODE, &v); + ok = evp_do_ciph_getparams(cipher, params); + + return ok != 0 ? v : 0; +} + int EVP_MD_block_size(const EVP_MD *md) { + if (md == NULL) { + EVPerr(EVP_F_EVP_MD_BLOCK_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL); + return -1; + } + + if (md->prov != NULL && md->dblock_size != NULL) + return (int)md->dblock_size(); + return md->block_size; } @@ -343,6 +455,10 @@ int EVP_MD_size(const EVP_MD *md) EVPerr(EVP_F_EVP_MD_SIZE, EVP_R_MESSAGE_DIGEST_IS_NULL); return -1; } + + if (md->prov != NULL && md->size != NULL) + return (int)md->size(); + return md->md_size; } @@ -353,23 +469,53 @@ unsigned long EVP_MD_flags(const EVP_MD *md) EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type) { - EVP_MD *md = (EVP_MD *)OPENSSL_zalloc(sizeof(EVP_MD)); + EVP_MD *md = OPENSSL_zalloc(sizeof(*md)); + if (md != NULL) { md->type = md_type; md->pkey_type = pkey_type; + md->lock = CRYPTO_THREAD_lock_new(); + if (md->lock == NULL) { + OPENSSL_free(md); + return NULL; + } + md->refcnt = 1; } return md; } + EVP_MD *EVP_MD_meth_dup(const EVP_MD *md) { EVP_MD *to = EVP_MD_meth_new(md->type, md->pkey_type); - if (md != NULL) + + if (to != NULL) { + CRYPTO_RWLOCK *lock = to->lock; memcpy(to, md, sizeof(*to)); + to->lock = lock; + } return to; } + +int EVP_MD_up_ref(EVP_MD *md) +{ + int ref = 0; + + CRYPTO_UP_REF(&md->refcnt, &ref, md->lock); + return 1; +} + void EVP_MD_meth_free(EVP_MD *md) { - OPENSSL_free(md); + if (md != NULL) { + int i; + + CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock); + if (i > 0) + return; + ossl_provider_free(md->prov); + CRYPTO_THREAD_lock_free(md->lock); + OPENSSL_free(md); + } } int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize) { @@ -441,7 +587,7 @@ int EVP_MD_meth_get_app_datasize(const EVP_MD *md) } unsigned long EVP_MD_meth_get_flags(const EVP_MD *md) { - return md->block_size; + return md->flags; } int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx) { @@ -475,9 +621,9 @@ int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd, const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx) { - if (!ctx) + if (ctx == NULL) return NULL; - return ctx->digest; + return ctx->reqdigest; } EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx) @@ -485,6 +631,28 @@ EVP_PKEY_CTX *EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx) return ctx->pctx; } +#if !defined(FIPS_MODE) +/* TODO(3.0): EVP_DigestSign* not yet supported in FIPS module */ +void EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx) +{ + /* + * it's reasonable to set NULL pctx (a.k.a clear the ctx->pctx), so + * we have to deal with the cleanup job here. + */ + if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) + EVP_PKEY_CTX_free(ctx->pctx); + + ctx->pctx = pctx; + + if (pctx != NULL) { + /* make sure pctx is not freed when destroying EVP_MD_CTX */ + EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX); + } else { + EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX); + } +} +#endif /* !defined(FIPS_MODE) */ + void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx) { return ctx->md_data; @@ -532,3 +700,164 @@ int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags) { return (ctx->flags & flags); } + +int EVP_str2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen), + void *ctx, int cmd, const char *value) +{ + size_t len; + + len = strlen(value); + if (len > INT_MAX) + return -1; + return cb(ctx, cmd, (void *)value, len); +} + +int EVP_hex2ctrl(int (*cb)(void *ctx, int cmd, void *buf, size_t buflen), + void *ctx, int cmd, const char *hex) +{ + unsigned char *bin; + long binlen; + int rv = -1; + + bin = OPENSSL_hexstr2buf(hex, &binlen); + if (bin == NULL) + return 0; + if (binlen <= INT_MAX) + rv = cb(ctx, cmd, bin, binlen); + OPENSSL_free(bin); + return rv; +} + +#ifndef FIPS_MODE +# ifndef OPENSSL_NO_DH +/* + * TODO(3.0): Temporarily unavailable in FIPS mode. This will need to be added + * in later. + */ + +# define MAX_PARAMS 10 +typedef struct { + /* Number of the current param */ + size_t curr; + struct { + /* Key for the current param */ + const char *key; + /* Value for the current param */ + const BIGNUM *bnparam; + /* Size of the buffer required for the BN */ + size_t bufsz; + } params[MAX_PARAMS]; + /* Running count of the total size required */ + size_t totsz; + int ispublic; +} PARAMS_TEMPLATE; + +static int push_param_bn(PARAMS_TEMPLATE *tmpl, const char *key, + const BIGNUM *bn) +{ + int sz; + + sz = BN_num_bytes(bn); + if (sz <= 0) + return 0; + tmpl->params[tmpl->curr].key = key; + tmpl->params[tmpl->curr].bnparam = bn; + tmpl->params[tmpl->curr++].bufsz = (size_t)sz; + tmpl->totsz += sizeof(OSSL_PARAM) + (size_t)sz; + + return 1; +} + +static OSSL_PARAM *param_template_to_param(PARAMS_TEMPLATE *tmpl, size_t *sz) +{ + size_t i; + void *buf; + OSSL_PARAM *param = NULL; + unsigned char *currbuf = NULL; + + if (tmpl->totsz == 0) + return NULL; + + /* Add some space for the end of OSSL_PARAM marker */ + tmpl->totsz += sizeof(*param); + + if (tmpl->ispublic) + buf = OPENSSL_zalloc(tmpl->totsz); + else + buf = OPENSSL_secure_zalloc(tmpl->totsz); + if (buf == NULL) + return NULL; + param = buf; + + currbuf = (unsigned char *)buf + (sizeof(*param) * (tmpl->curr + 1)); + + for (i = 0; i < tmpl->curr; i++) { + if (!ossl_assert((currbuf - (unsigned char *)buf ) + + tmpl->params[i].bufsz <= tmpl->totsz)) + goto err; + if (BN_bn2nativepad(tmpl->params[i].bnparam, currbuf, + tmpl->params[i].bufsz) < 0) + goto err; + param[i] = OSSL_PARAM_construct_BN(tmpl->params[i].key, currbuf, + tmpl->params[i].bufsz); + currbuf += tmpl->params[i].bufsz; + } + param[i] = OSSL_PARAM_construct_end(); + + if (sz != NULL) + *sz = tmpl->totsz; + return param; + + err: + if (tmpl->ispublic) + OPENSSL_free(param); + else + OPENSSL_clear_free(param, tmpl->totsz); + return NULL; +} + +static OSSL_PARAM *evp_pkey_dh_to_param(EVP_PKEY *pkey, size_t *sz) +{ + DH *dh = pkey->pkey.dh; + PARAMS_TEMPLATE tmpl = {0}; + const BIGNUM *p = DH_get0_p(dh), *g = DH_get0_g(dh), *q = DH_get0_q(dh); + const BIGNUM *pub_key = DH_get0_pub_key(dh); + const BIGNUM *priv_key = DH_get0_priv_key(dh); + + if (p == NULL || g == NULL || pub_key == NULL) + return NULL; + + if (!push_param_bn(&tmpl, OSSL_PKEY_PARAM_DH_P, p) + || !push_param_bn(&tmpl, OSSL_PKEY_PARAM_DH_G, g) + || !push_param_bn(&tmpl, OSSL_PKEY_PARAM_DH_PUB_KEY, pub_key)) + return NULL; + + if (q != NULL) { + if (!push_param_bn(&tmpl, OSSL_PKEY_PARAM_DH_Q, q)) + return NULL; + } + + if (priv_key != NULL) { + if (!push_param_bn(&tmpl, OSSL_PKEY_PARAM_DH_PRIV_KEY, priv_key)) + return NULL; + } else { + tmpl.ispublic = 1; + } + + return param_template_to_param(&tmpl, sz); +} +# endif /* OPENSSL_NO_DH */ + +OSSL_PARAM *evp_pkey_to_param(EVP_PKEY *pkey, size_t *sz) +{ + switch (pkey->type) { +# ifndef OPENSSL_NO_DH + case EVP_PKEY_DH: + return evp_pkey_dh_to_param(pkey, sz); +# endif + default: + return NULL; + } +} + +#endif /* FIPS_MODE */