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authorJung-uk Kim <jkim@FreeBSD.org>2018-09-13 19:18:07 +0000
committerJung-uk Kim <jkim@FreeBSD.org>2018-09-13 19:18:07 +0000
commita43ce912fc025d11e1395506111f75fc194d7ba5 (patch)
tree9794cf7720d75938ed0ea4f499c0dcd4b6eacdda /crypto/engine/eng_devcrypto.c
parent02be298e504b8554caca6dc85af450e1ea44d19d (diff)
downloadsrc-a43ce912fc025d11e1395506111f75fc194d7ba5.tar.gz
src-a43ce912fc025d11e1395506111f75fc194d7ba5.zip
Import OpenSSL 1.1.1.vendor/openssl/1.1.1
Notes
Notes: svn path=/vendor-crypto/openssl/dist/; revision=338658 svn path=/vendor-crypto/openssl/1.1.1/; revision=338659; tag=vendor/openssl/1.1.1
Diffstat (limited to 'crypto/engine/eng_devcrypto.c')
-rw-r--r--crypto/engine/eng_devcrypto.c678
1 files changed, 678 insertions, 0 deletions
diff --git a/crypto/engine/eng_devcrypto.c b/crypto/engine/eng_devcrypto.c
new file mode 100644
index 000000000000..9deaf5c6188c
--- /dev/null
+++ b/crypto/engine/eng_devcrypto.c
@@ -0,0 +1,678 @@
+/*
+ * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (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 "e_os.h"
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <assert.h>
+
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <openssl/engine.h>
+#include <openssl/objects.h>
+#include <crypto/cryptodev.h>
+
+#include "internal/engine.h"
+
+#ifdef CRYPTO_ALGORITHM_MIN
+# define CHECK_BSD_STYLE_MACROS
+#endif
+
+/******************************************************************************
+ *
+ * Ciphers
+ *
+ * Because they all do the same basic operation, we have only one set of
+ * method functions for them all to share, and a mapping table between
+ * NIDs and cryptodev IDs, with all the necessary size data.
+ *
+ *****/
+
+struct cipher_ctx {
+ int cfd;
+ struct session_op sess;
+
+ /* to pass from init to do_cipher */
+ const unsigned char *iv;
+ int op; /* COP_ENCRYPT or COP_DECRYPT */
+};
+
+static const struct cipher_data_st {
+ int nid;
+ int blocksize;
+ int keylen;
+ int ivlen;
+ int flags;
+ int devcryptoid;
+} cipher_data[] = {
+#ifndef OPENSSL_NO_DES
+ { NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC },
+ { NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC },
+#endif
+#ifndef OPENSSL_NO_BF
+ { NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC },
+#endif
+#ifndef OPENSSL_NO_CAST
+ { NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC },
+#endif
+ { NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
+ { NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
+ { NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC },
+#ifndef OPENSSL_NO_RC4
+ { NID_rc4, 1, 16, 0, CRYPTO_ARC4 },
+#endif
+#if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_CTR)
+ { NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
+ { NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
+ { NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR },
+#endif
+#if 0 /* Not yet supported */
+ { NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
+ { NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS },
+#endif
+#if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_ECB)
+ { NID_aes_128_ecb, 16, 128 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
+ { NID_aes_192_ecb, 16, 192 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
+ { NID_aes_256_ecb, 16, 256 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB },
+#endif
+#if 0 /* Not yet supported */
+ { NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
+ { NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
+ { NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM },
+#endif
+#ifndef OPENSSL_NO_CAMELLIA
+ { NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE,
+ CRYPTO_CAMELLIA_CBC },
+ { NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE,
+ CRYPTO_CAMELLIA_CBC },
+ { NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE,
+ CRYPTO_CAMELLIA_CBC },
+#endif
+};
+
+static size_t get_cipher_data_index(int nid)
+{
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(cipher_data); i++)
+ if (nid == cipher_data[i].nid)
+ return i;
+
+ /*
+ * Code further down must make sure that only NIDs in the table above
+ * are used. If any other NID reaches this function, there's a grave
+ * coding error further down.
+ */
+ assert("Code that never should be reached" == NULL);
+ return -1;
+}
+
+static const struct cipher_data_st *get_cipher_data(int nid)
+{
+ return &cipher_data[get_cipher_data_index(nid)];
+}
+
+/*
+ * Following are the three necessary functions to map OpenSSL functionality
+ * with cryptodev.
+ */
+
+static int cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ struct cipher_ctx *cipher_ctx =
+ (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+ const struct cipher_data_st *cipher_d =
+ get_cipher_data(EVP_CIPHER_CTX_nid(ctx));
+
+ if ((cipher_ctx->cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
+ SYSerr(SYS_F_OPEN, errno);
+ return 0;
+ }
+
+ memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
+ cipher_ctx->sess.cipher = cipher_d->devcryptoid;
+ cipher_ctx->sess.keylen = cipher_d->keylen;
+ cipher_ctx->sess.key = (void *)key;
+ cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT;
+ if (ioctl(cipher_ctx->cfd, CIOCGSESSION, &cipher_ctx->sess) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ close(cipher_ctx->cfd);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int cipher_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, size_t inl)
+{
+ struct cipher_ctx *cipher_ctx =
+ (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+ struct crypt_op cryp;
+#if !defined(COP_FLAG_WRITE_IV)
+ unsigned char saved_iv[EVP_MAX_IV_LENGTH];
+#endif
+
+ memset(&cryp, 0, sizeof(cryp));
+ cryp.ses = cipher_ctx->sess.ses;
+ cryp.len = inl;
+ cryp.src = (void *)in;
+ cryp.dst = (void *)out;
+ cryp.iv = (void *)EVP_CIPHER_CTX_iv_noconst(ctx);
+ cryp.op = cipher_ctx->op;
+#if !defined(COP_FLAG_WRITE_IV)
+ cryp.flags = 0;
+
+ if (EVP_CIPHER_CTX_iv_length(ctx) > 0) {
+ assert(inl >= EVP_CIPHER_CTX_iv_length(ctx));
+ if (!EVP_CIPHER_CTX_encrypting(ctx)) {
+ unsigned char *ivptr = in + inl - EVP_CIPHER_CTX_iv_length(ctx);
+
+ memcpy(saved_iv, ivptr, EVP_CIPHER_CTX_iv_length(ctx));
+ }
+ }
+#else
+ cryp.flags = COP_FLAG_WRITE_IV;
+#endif
+
+ if (ioctl(cipher_ctx->cfd, CIOCCRYPT, &cryp) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ return 0;
+ }
+
+#if !defined(COP_FLAG_WRITE_IV)
+ if (EVP_CIPHER_CTX_iv_length(ctx) > 0) {
+ unsigned char *ivptr = saved_iv;
+
+ assert(inl >= EVP_CIPHER_CTX_iv_length(ctx));
+ if (!EVP_CIPHER_CTX_encrypting(ctx))
+ ivptr = out + inl - EVP_CIPHER_CTX_iv_length(ctx);
+
+ memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), ivptr,
+ EVP_CIPHER_CTX_iv_length(ctx));
+ }
+#endif
+
+ return 1;
+}
+
+static int cipher_cleanup(EVP_CIPHER_CTX *ctx)
+{
+ struct cipher_ctx *cipher_ctx =
+ (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+ if (ioctl(cipher_ctx->cfd, CIOCFSESSION, &cipher_ctx->sess) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ return 0;
+ }
+ if (close(cipher_ctx->cfd) < 0) {
+ SYSerr(SYS_F_CLOSE, errno);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Keep a table of known nids and associated methods.
+ * Note that known_cipher_nids[] isn't necessarily indexed the same way as
+ * cipher_data[] above, which known_cipher_methods[] is.
+ */
+static int known_cipher_nids[OSSL_NELEM(cipher_data)];
+static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */
+static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, };
+
+static void prepare_cipher_methods()
+{
+ size_t i;
+ struct session_op sess;
+ int cfd;
+
+ if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0)
+ return;
+
+ memset(&sess, 0, sizeof(sess));
+ sess.key = (void *)"01234567890123456789012345678901234567890123456789";
+
+ for (i = 0, known_cipher_nids_amount = 0;
+ i < OSSL_NELEM(cipher_data); i++) {
+
+ /*
+ * Check that the algo is really availably by trying to open and close
+ * a session.
+ */
+ sess.cipher = cipher_data[i].devcryptoid;
+ sess.keylen = cipher_data[i].keylen;
+ if (ioctl(cfd, CIOCGSESSION, &sess) < 0
+ || ioctl(cfd, CIOCFSESSION, &sess) < 0)
+ continue;
+
+ if ((known_cipher_methods[i] =
+ EVP_CIPHER_meth_new(cipher_data[i].nid,
+ cipher_data[i].blocksize,
+ cipher_data[i].keylen)) == NULL
+ || !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i],
+ cipher_data[i].ivlen)
+ || !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
+ cipher_data[i].flags
+ | EVP_CIPH_FLAG_DEFAULT_ASN1)
+ || !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
+ || !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
+ cipher_do_cipher)
+ || !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i],
+ cipher_cleanup)
+ || !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i],
+ sizeof(struct cipher_ctx))) {
+ EVP_CIPHER_meth_free(known_cipher_methods[i]);
+ known_cipher_methods[i] = NULL;
+ } else {
+ known_cipher_nids[known_cipher_nids_amount++] =
+ cipher_data[i].nid;
+ }
+ }
+
+ close(cfd);
+}
+
+static const EVP_CIPHER *get_cipher_method(int nid)
+{
+ size_t i = get_cipher_data_index(nid);
+
+ if (i == (size_t)-1)
+ return NULL;
+ return known_cipher_methods[i];
+}
+
+static int get_cipher_nids(const int **nids)
+{
+ *nids = known_cipher_nids;
+ return known_cipher_nids_amount;
+}
+
+static void destroy_cipher_method(int nid)
+{
+ size_t i = get_cipher_data_index(nid);
+
+ EVP_CIPHER_meth_free(known_cipher_methods[i]);
+ known_cipher_methods[i] = NULL;
+}
+
+static void destroy_all_cipher_methods()
+{
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(cipher_data); i++)
+ destroy_cipher_method(cipher_data[i].nid);
+}
+
+static int devcrypto_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+ const int **nids, int nid)
+{
+ if (cipher == NULL)
+ return get_cipher_nids(nids);
+
+ *cipher = get_cipher_method(nid);
+
+ return *cipher != NULL;
+}
+
+/*
+ * We only support digests if the cryptodev implementation supports multiple
+ * data updates. Otherwise, we would be forced to maintain a cache, which is
+ * perilous if there's a lot of data coming in (if someone wants to checksum
+ * an OpenSSL tarball, for example).
+ */
+#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
+
+/******************************************************************************
+ *
+ * Digests
+ *
+ * Because they all do the same basic operation, we have only one set of
+ * method functions for them all to share, and a mapping table between
+ * NIDs and cryptodev IDs, with all the necessary size data.
+ *
+ *****/
+
+struct digest_ctx {
+ int cfd;
+ struct session_op sess;
+ int init;
+};
+
+static const struct digest_data_st {
+ int nid;
+ int digestlen;
+ int devcryptoid;
+} digest_data[] = {
+#ifndef OPENSSL_NO_MD5
+ { NID_md5, 16, CRYPTO_MD5 },
+#endif
+ { NID_sha1, 20, CRYPTO_SHA1 },
+#ifndef OPENSSL_NO_RMD160
+# if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_RIPEMD160)
+ { NID_ripemd160, 20, CRYPTO_RIPEMD160 },
+# endif
+#endif
+#if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_224)
+ { NID_sha224, 224 / 8, CRYPTO_SHA2_224 },
+#endif
+#if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_256)
+ { NID_sha256, 256 / 8, CRYPTO_SHA2_256 },
+#endif
+#if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_384)
+ { NID_sha384, 384 / 8, CRYPTO_SHA2_384 },
+#endif
+#if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_512)
+ { NID_sha512, 512 / 8, CRYPTO_SHA2_512 },
+#endif
+};
+
+static size_t get_digest_data_index(int nid)
+{
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(digest_data); i++)
+ if (nid == digest_data[i].nid)
+ return i;
+
+ /*
+ * Code further down must make sure that only NIDs in the table above
+ * are used. If any other NID reaches this function, there's a grave
+ * coding error further down.
+ */
+ assert("Code that never should be reached" == NULL);
+ return -1;
+}
+
+static const struct digest_data_st *get_digest_data(int nid)
+{
+ return &digest_data[get_digest_data_index(nid)];
+}
+
+/*
+ * Following are the four necessary functions to map OpenSSL functionality
+ * with cryptodev.
+ */
+
+static int digest_init(EVP_MD_CTX *ctx)
+{
+ struct digest_ctx *digest_ctx =
+ (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
+ const struct digest_data_st *digest_d =
+ get_digest_data(EVP_MD_CTX_type(ctx));
+
+ if (digest_ctx->init == 0
+ && (digest_ctx->cfd = open("/dev/crypto", O_RDWR, 0)) < 0) {
+ SYSerr(SYS_F_OPEN, errno);
+ return 0;
+ }
+
+ digest_ctx->init = 1;
+
+ memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess));
+ digest_ctx->sess.mac = digest_d->devcryptoid;
+ if (ioctl(digest_ctx->cfd, CIOCGSESSION, &digest_ctx->sess) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ close(digest_ctx->cfd);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int digest_op(struct digest_ctx *ctx, const void *src, size_t srclen,
+ void *res, unsigned int flags)
+{
+ struct crypt_op cryp;
+
+ memset(&cryp, 0, sizeof(cryp));
+ cryp.ses = ctx->sess.ses;
+ cryp.len = srclen;
+ cryp.src = (void *)src;
+ cryp.dst = NULL;
+ cryp.mac = res;
+ cryp.flags = flags;
+ return ioctl(ctx->cfd, CIOCCRYPT, &cryp);
+}
+
+static int digest_update(EVP_MD_CTX *ctx, const void *data, size_t count)
+{
+ struct digest_ctx *digest_ctx =
+ (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
+
+ if (count == 0)
+ return 1;
+
+ if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int digest_final(EVP_MD_CTX *ctx, unsigned char *md)
+{
+ struct digest_ctx *digest_ctx =
+ (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
+
+ if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ return 0;
+ }
+ if (ioctl(digest_ctx->cfd, CIOCFSESSION, &digest_ctx->sess) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int digest_cleanup(EVP_MD_CTX *ctx)
+{
+ struct digest_ctx *digest_ctx =
+ (struct digest_ctx *)EVP_MD_CTX_md_data(ctx);
+
+ if (close(digest_ctx->cfd) < 0) {
+ SYSerr(SYS_F_CLOSE, errno);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * Keep a table of known nids and associated methods.
+ * Note that known_digest_nids[] isn't necessarily indexed the same way as
+ * digest_data[] above, which known_digest_methods[] is.
+ */
+static int known_digest_nids[OSSL_NELEM(digest_data)];
+static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */
+static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, };
+
+static void prepare_digest_methods()
+{
+ size_t i;
+ struct session_op sess;
+ int cfd;
+
+ if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0)
+ return;
+
+ memset(&sess, 0, sizeof(sess));
+
+ for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data);
+ i++) {
+
+ /*
+ * Check that the algo is really availably by trying to open and close
+ * a session.
+ */
+ sess.mac = digest_data[i].devcryptoid;
+ if (ioctl(cfd, CIOCGSESSION, &sess) < 0
+ || ioctl(cfd, CIOCFSESSION, &sess) < 0)
+ continue;
+
+ if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid,
+ NID_undef)) == NULL
+ || !EVP_MD_meth_set_result_size(known_digest_methods[i],
+ digest_data[i].digestlen)
+ || !EVP_MD_meth_set_init(known_digest_methods[i], digest_init)
+ || !EVP_MD_meth_set_update(known_digest_methods[i], digest_update)
+ || !EVP_MD_meth_set_final(known_digest_methods[i], digest_final)
+ || !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup)
+ || !EVP_MD_meth_set_app_datasize(known_digest_methods[i],
+ sizeof(struct digest_ctx))) {
+ EVP_MD_meth_free(known_digest_methods[i]);
+ known_digest_methods[i] = NULL;
+ } else {
+ known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid;
+ }
+ }
+
+ close(cfd);
+}
+
+static const EVP_MD *get_digest_method(int nid)
+{
+ size_t i = get_digest_data_index(nid);
+
+ if (i == (size_t)-1)
+ return NULL;
+ return known_digest_methods[i];
+}
+
+static int get_digest_nids(const int **nids)
+{
+ *nids = known_digest_nids;
+ return known_digest_nids_amount;
+}
+
+static void destroy_digest_method(int nid)
+{
+ size_t i = get_digest_data_index(nid);
+
+ EVP_MD_meth_free(known_digest_methods[i]);
+ known_digest_methods[i] = NULL;
+}
+
+static void destroy_all_digest_methods()
+{
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(digest_data); i++)
+ destroy_digest_method(digest_data[i].nid);
+}
+
+static int devcrypto_digests(ENGINE *e, const EVP_MD **digest,
+ const int **nids, int nid)
+{
+ if (digest == NULL)
+ return get_digest_nids(nids);
+
+ *digest = get_digest_method(nid);
+
+ return *digest != NULL;
+}
+
+#endif
+
+/******************************************************************************
+ *
+ * LOAD / UNLOAD
+ *
+ *****/
+
+static int devcrypto_unload(ENGINE *e)
+{
+ destroy_all_cipher_methods();
+#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
+ destroy_all_digest_methods();
+#endif
+ return 1;
+}
+/*
+ * This engine is always built into libcrypto, so it doesn't offer any
+ * ability to be dynamically loadable.
+ */
+void engine_load_devcrypto_int()
+{
+ ENGINE *e = NULL;
+
+ if (access("/dev/crypto", R_OK | W_OK) < 0) {
+ fprintf(stderr,
+ "/dev/crypto not present, not enabling devcrypto engine\n");
+ return;
+ }
+
+ prepare_cipher_methods();
+#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
+ prepare_digest_methods();
+#endif
+
+ if ((e = ENGINE_new()) == NULL)
+ return;
+
+ if (!ENGINE_set_id(e, "devcrypto")
+ || !ENGINE_set_name(e, "/dev/crypto engine")
+ || !ENGINE_set_destroy_function(e, devcrypto_unload)
+
+/*
+ * Asymmetric ciphers aren't well supported with /dev/crypto. Among the BSD
+ * implementations, it seems to only exist in FreeBSD, and regarding the
+ * parameters in its crypt_kop, the manual crypto(4) has this to say:
+ *
+ * The semantics of these arguments are currently undocumented.
+ *
+ * Reading through the FreeBSD source code doesn't give much more than
+ * their CRK_MOD_EXP implementation for ubsec.
+ *
+ * It doesn't look much better with cryptodev-linux. They have the crypt_kop
+ * structure as well as the command (CRK_*) in cryptodev.h, but no support
+ * seems to be implemented at all for the moment.
+ *
+ * At the time of writing, it seems impossible to write proper support for
+ * FreeBSD's asym features without some very deep knowledge and access to
+ * specific kernel modules.
+ *
+ * /Richard Levitte, 2017-05-11
+ */
+#if 0
+# ifndef OPENSSL_NO_RSA
+ || !ENGINE_set_RSA(e, devcrypto_rsa)
+# endif
+# ifndef OPENSSL_NO_DSA
+ || !ENGINE_set_DSA(e, devcrypto_dsa)
+# endif
+# ifndef OPENSSL_NO_DH
+ || !ENGINE_set_DH(e, devcrypto_dh)
+# endif
+# ifndef OPENSSL_NO_EC
+ || !ENGINE_set_EC(e, devcrypto_ec)
+# endif
+#endif
+ || !ENGINE_set_ciphers(e, devcrypto_ciphers)
+#if defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL)
+ || !ENGINE_set_digests(e, devcrypto_digests)
+#endif
+ ) {
+ ENGINE_free(e);
+ return;
+ }
+
+ ENGINE_add(e);
+ ENGINE_free(e); /* Loose our local reference */
+ ERR_clear_error();
+}