539 lines
13 KiB
C
539 lines
13 KiB
C
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/*
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* Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* DH & DSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/evp.h>
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#include "dh_local.h"
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include <openssl/objects.h>
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#include "crypto/evp.h"
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/* DH pkey context structure */
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typedef struct {
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/* Parameter gen parameters */
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int prime_len;
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int generator;
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int paramgen_type;
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int subprime_len;
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int pad;
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/* message digest used for parameter generation */
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const EVP_MD *md;
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int param_nid;
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/* Keygen callback info */
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int gentmp[2];
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/* KDF (if any) to use for DH */
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char kdf_type;
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/* OID to use for KDF */
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ASN1_OBJECT *kdf_oid;
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/* Message digest to use for key derivation */
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const EVP_MD *kdf_md;
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/* User key material */
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unsigned char *kdf_ukm;
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size_t kdf_ukmlen;
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/* KDF output length */
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size_t kdf_outlen;
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} DH_PKEY_CTX;
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static int pkey_dh_init(EVP_PKEY_CTX *ctx)
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{
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DH_PKEY_CTX *dctx;
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if ((dctx = OPENSSL_zalloc(sizeof(*dctx))) == NULL)
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return 0;
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dctx->prime_len = 2048;
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dctx->subprime_len = -1;
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dctx->generator = 2;
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dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
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ctx->data = dctx;
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ctx->keygen_info = dctx->gentmp;
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ctx->keygen_info_count = 2;
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return 1;
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}
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static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
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{
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DH_PKEY_CTX *dctx = ctx->data;
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if (dctx != NULL) {
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OPENSSL_free(dctx->kdf_ukm);
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ASN1_OBJECT_free(dctx->kdf_oid);
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OPENSSL_free(dctx);
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}
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}
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static int pkey_dh_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
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{
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DH_PKEY_CTX *dctx, *sctx;
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if (!pkey_dh_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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dctx->prime_len = sctx->prime_len;
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dctx->subprime_len = sctx->subprime_len;
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dctx->generator = sctx->generator;
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dctx->paramgen_type = sctx->paramgen_type;
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dctx->pad = sctx->pad;
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dctx->md = sctx->md;
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dctx->param_nid = sctx->param_nid;
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dctx->kdf_type = sctx->kdf_type;
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dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
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if (dctx->kdf_oid == NULL)
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return 0;
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dctx->kdf_md = sctx->kdf_md;
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if (sctx->kdf_ukm != NULL) {
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dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
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if (dctx->kdf_ukm == NULL)
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return 0;
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dctx->kdf_ukmlen = sctx->kdf_ukmlen;
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}
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dctx->kdf_outlen = sctx->kdf_outlen;
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return 1;
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}
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static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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DH_PKEY_CTX *dctx = ctx->data;
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switch (type) {
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case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
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if (p1 < 256)
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return -2;
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dctx->prime_len = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN:
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if (dctx->paramgen_type == DH_PARAMGEN_TYPE_GENERATOR)
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return -2;
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dctx->subprime_len = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PAD:
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dctx->pad = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
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if (dctx->paramgen_type != DH_PARAMGEN_TYPE_GENERATOR)
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return -2;
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dctx->generator = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
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#ifdef OPENSSL_NO_DSA
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if (p1 != DH_PARAMGEN_TYPE_GENERATOR)
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return -2;
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#else
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if (p1 < 0 || p1 > 2)
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return -2;
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#endif
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dctx->paramgen_type = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_RFC5114:
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if (p1 < 1 || p1 > 3 || dctx->param_nid != NID_undef)
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return -2;
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dctx->param_nid = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_NID:
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if (p1 <= 0 || dctx->param_nid != NID_undef)
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return -2;
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dctx->param_nid = p1;
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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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return 1;
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case EVP_PKEY_CTRL_DH_KDF_TYPE:
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if (p1 == -2)
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return dctx->kdf_type;
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if (p1 != EVP_PKEY_DH_KDF_NONE && p1 != EVP_PKEY_DH_KDF_X9_42)
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return -2;
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dctx->kdf_type = p1;
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return 1;
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case EVP_PKEY_CTRL_DH_KDF_MD:
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dctx->kdf_md = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_MD:
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*(const EVP_MD **)p2 = dctx->kdf_md;
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return 1;
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case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
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if (p1 <= 0)
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return -2;
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dctx->kdf_outlen = (size_t)p1;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
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*(int *)p2 = dctx->kdf_outlen;
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return 1;
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case EVP_PKEY_CTRL_DH_KDF_UKM:
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OPENSSL_free(dctx->kdf_ukm);
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dctx->kdf_ukm = p2;
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if (p2)
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dctx->kdf_ukmlen = p1;
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else
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dctx->kdf_ukmlen = 0;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
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*(unsigned char **)p2 = dctx->kdf_ukm;
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return dctx->kdf_ukmlen;
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case EVP_PKEY_CTRL_DH_KDF_OID:
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ASN1_OBJECT_free(dctx->kdf_oid);
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dctx->kdf_oid = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_DH_KDF_OID:
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*(ASN1_OBJECT **)p2 = dctx->kdf_oid;
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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_dh_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, "dh_paramgen_prime_len") == 0) {
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int len;
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len = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
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}
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if (strcmp(type, "dh_rfc5114") == 0) {
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DH_PKEY_CTX *dctx = ctx->data;
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int id;
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id = atoi(value);
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if (id < 0 || id > 3)
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return -2;
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dctx->param_nid = id;
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return 1;
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}
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if (strcmp(type, "dh_param") == 0) {
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DH_PKEY_CTX *dctx = ctx->data;
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int nid = OBJ_sn2nid(value);
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if (nid == NID_undef) {
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ERR_raise(ERR_LIB_DH, DH_R_INVALID_PARAMETER_NAME);
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return -2;
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}
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dctx->param_nid = nid;
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return 1;
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}
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if (strcmp(type, "dh_paramgen_generator") == 0) {
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int len;
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len = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
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}
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if (strcmp(type, "dh_paramgen_subprime_len") == 0) {
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int len;
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len = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
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}
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if (strcmp(type, "dh_paramgen_type") == 0) {
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int typ;
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typ = atoi(value);
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return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
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}
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if (strcmp(type, "dh_pad") == 0) {
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int pad;
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pad = atoi(value);
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return EVP_PKEY_CTX_set_dh_pad(ctx, pad);
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}
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return -2;
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}
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static DH *ffc_params_generate(OSSL_LIB_CTX *libctx, DH_PKEY_CTX *dctx,
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BN_GENCB *pcb)
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{
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DH *ret;
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int rv = 0;
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int res;
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int prime_len = dctx->prime_len;
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int subprime_len = dctx->subprime_len;
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if (dctx->paramgen_type > DH_PARAMGEN_TYPE_FIPS_186_4)
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return NULL;
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ret = DH_new();
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if (ret == NULL)
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return NULL;
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if (subprime_len == -1) {
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if (prime_len >= 2048)
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subprime_len = 256;
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else
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subprime_len = 160;
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}
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if (dctx->md != NULL)
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ossl_ffc_set_digest(&ret->params, EVP_MD_get0_name(dctx->md), NULL);
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# ifndef FIPS_MODULE
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if (dctx->paramgen_type == DH_PARAMGEN_TYPE_FIPS_186_2)
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rv = ossl_ffc_params_FIPS186_2_generate(libctx, &ret->params,
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FFC_PARAM_TYPE_DH,
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prime_len, subprime_len, &res,
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pcb);
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else
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# endif
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/* For FIPS we always use the DH_PARAMGEN_TYPE_FIPS_186_4 generator */
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if (dctx->paramgen_type >= DH_PARAMGEN_TYPE_FIPS_186_2)
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rv = ossl_ffc_params_FIPS186_4_generate(libctx, &ret->params,
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FFC_PARAM_TYPE_DH,
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prime_len, subprime_len, &res,
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pcb);
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if (rv <= 0) {
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DH_free(ret);
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return NULL;
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}
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return ret;
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}
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static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx,
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EVP_PKEY *pkey)
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{
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DH *dh = NULL;
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DH_PKEY_CTX *dctx = ctx->data;
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BN_GENCB *pcb = NULL;
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int ret;
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/*
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* Look for a safe prime group for key establishment. Which uses
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* either RFC_3526 (modp_XXXX) or RFC_7919 (ffdheXXXX).
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* RFC_5114 is also handled here for param_nid = (1..3)
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*/
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if (dctx->param_nid != NID_undef) {
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int type = dctx->param_nid <= 3 ? EVP_PKEY_DHX : EVP_PKEY_DH;
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if ((dh = DH_new_by_nid(dctx->param_nid)) == NULL)
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return 0;
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EVP_PKEY_assign(pkey, type, dh);
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return 1;
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}
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if (ctx->pkey_gencb != NULL) {
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pcb = BN_GENCB_new();
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if (pcb == NULL)
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return 0;
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evp_pkey_set_cb_translate(pcb, ctx);
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}
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# ifdef FIPS_MODULE
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dctx->paramgen_type = DH_PARAMGEN_TYPE_FIPS_186_4;
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# endif /* FIPS_MODULE */
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if (dctx->paramgen_type >= DH_PARAMGEN_TYPE_FIPS_186_2) {
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dh = ffc_params_generate(NULL, dctx, pcb);
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BN_GENCB_free(pcb);
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if (dh == NULL)
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return 0;
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EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
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return 1;
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}
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dh = DH_new();
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if (dh == NULL) {
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BN_GENCB_free(pcb);
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return 0;
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}
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ret = DH_generate_parameters_ex(dh,
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dctx->prime_len, dctx->generator, pcb);
|
||
|
|
BN_GENCB_free(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_PKEY_CTX *dctx = ctx->data;
|
||
|
|
DH *dh = NULL;
|
||
|
|
|
||
|
|
if (ctx->pkey == NULL && dctx->param_nid == NID_undef) {
|
||
|
|
ERR_raise(ERR_LIB_DH, DH_R_NO_PARAMETERS_SET);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (dctx->param_nid != NID_undef)
|
||
|
|
dh = DH_new_by_nid(dctx->param_nid);
|
||
|
|
else
|
||
|
|
dh = DH_new();
|
||
|
|
if (dh == NULL)
|
||
|
|
return 0;
|
||
|
|
EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
|
||
|
|
/* Note: if error return, pkey is freed by parent routine */
|
||
|
|
if (ctx->pkey != NULL && !EVP_PKEY_copy_parameters(pkey, ctx->pkey))
|
||
|
|
return 0;
|
||
|
|
return DH_generate_key((DH *)EVP_PKEY_get0_DH(pkey));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
|
||
|
|
size_t *keylen)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
DH *dh;
|
||
|
|
const DH *dhpub;
|
||
|
|
DH_PKEY_CTX *dctx = ctx->data;
|
||
|
|
BIGNUM *dhpubbn;
|
||
|
|
|
||
|
|
if (ctx->pkey == NULL || ctx->peerkey == NULL) {
|
||
|
|
ERR_raise(ERR_LIB_DH, DH_R_KEYS_NOT_SET);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
dh = (DH *)EVP_PKEY_get0_DH(ctx->pkey);
|
||
|
|
dhpub = EVP_PKEY_get0_DH(ctx->peerkey);
|
||
|
|
if (dhpub == NULL) {
|
||
|
|
ERR_raise(ERR_LIB_DH, DH_R_KEYS_NOT_SET);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
dhpubbn = dhpub->pub_key;
|
||
|
|
if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE) {
|
||
|
|
if (key == NULL) {
|
||
|
|
*keylen = DH_size(dh);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (dctx->pad)
|
||
|
|
ret = DH_compute_key_padded(key, dhpubbn, dh);
|
||
|
|
else
|
||
|
|
ret = DH_compute_key(key, dhpubbn, 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;
|
||
|
|
int 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;
|
||
|
|
if ((Zlen = DH_size(dh)) <= 0)
|
||
|
|
return 0;
|
||
|
|
if ((Z = OPENSSL_malloc(Zlen)) == NULL)
|
||
|
|
return 0;
|
||
|
|
if (DH_compute_key_padded(Z, dhpubbn, 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:
|
||
|
|
OPENSSL_clear_free(Z, Zlen);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static 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 *ossl_dh_pkey_method(void)
|
||
|
|
{
|
||
|
|
return &dh_pkey_meth;
|
||
|
|
}
|
||
|
|
|
||
|
|
static 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
|
||
|
|
};
|
||
|
|
|
||
|
|
const EVP_PKEY_METHOD *ossl_dhx_pkey_method(void)
|
||
|
|
{
|
||
|
|
return &dhx_pkey_meth;
|
||
|
|
}
|