openwrt/package/system/apk/patches/0002-mbedtls-support.patch

From 68352e0cb94fe08b220d4befec828171ec871154 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Fri, 5 Apr 2024 12:06:56 +0300
Subject: [PATCH 1/2] add alternate url wget implementation

---
 meson.build       |   6 +-
 meson_options.txt |   1 +
 src/io_url_wget.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++
 src/meson.build   |   8 ++-
 4 files changed, 150 insertions(+), 2 deletions(-)
 create mode 100644 src/io_url_wget.c

diff --git a/meson.build b/meson.build
index 1a44c11f..9a14cac0 100644
--- a/meson.build
+++ b/meson.build
@@ -33,6 +33,10 @@ subproject = meson.is_subproject()
 
 subdir('doc')
 subdir('portability')
-subdir('libfetch')
+if get_option('url_backend') == 'libfetch'
+	subdir('libfetch')
+else
+	libfetch_dep = dependency('', required: false)
+endif
 subdir('src')
 subdir('tests')
diff --git a/meson_options.txt b/meson_options.txt
index 693f46ec..44b88b32 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -5,5 +5,6 @@ option('help', description: 'Build help into apk binaries, needs lua', type: 'fe
 option('lua', description: 'Build luaapk (lua bindings)', type: 'feature', value: 'auto')
 option('lua_version', description: 'Lua version to build against', type: 'string', value: '5.3')
 option('static_apk', description: 'Also build apk.static', type: 'boolean', value: false)
+option('url_backend', description: 'URL backend', type: 'string', value: 'libfetch')
 option('uvol_db_target', description: 'Default target for uvol database layer', type: 'string')
 option('zstd', description: 'Build with zstd support', type: 'boolean', value: true)
diff --git a/src/io_url_wget.c b/src/io_url_wget.c
new file mode 100644
index 00000000..d8885a4f
--- /dev/null
+++ b/src/io_url_wget.c
@@ -0,0 +1,137 @@
+/* io_url_wget.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
+ * Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ */
+
+#include <spawn.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include "apk_io.h"
+
+static int wget_translate_status(int status)
+{
+	if (!WIFEXITED(status)) return -EFAULT;
+	switch (WEXITSTATUS(status)) {
+	case 0: return 0;
+	case 3: return -EIO;
+	case 4: return -ENETUNREACH;
+	case 5: return -EACCES;
+	case 6: return -EACCES;
+	case 7: return -EPROTO;
+	default: return -APKE_REMOTE_IO;
+	}
+}
+
+struct apk_wget_istream {
+	struct apk_istream is;
+	int fd;
+	pid_t pid;
+};
+
+static int wget_spawn(const char *url, pid_t *pid, int *fd)
+{
+	int r, pipefds[2];
+	posix_spawn_file_actions_t act;
+	char *argv[] = {
+		(char*)"wget", "-q", (char*) url, "-O", "-", 0
+	};
+
+	if (pipe2(pipefds, O_CLOEXEC) != 0) return -errno;
+
+	posix_spawn_file_actions_init(&act);
+	posix_spawn_file_actions_adddup2(&act, pipefds[1], STDOUT_FILENO);
+	r = posix_spawnp(pid, "wget", &act, 0, argv, environ);
+	posix_spawn_file_actions_destroy(&act);
+	if (r != 0) return -r;
+	close(pipefds[1]);
+	*fd = pipefds[0];
+	return 0;
+}
+
+static int wget_check_exit(struct apk_wget_istream *wis)
+{
+	int status;
+
+	if (wis->pid == 0) return apk_istream_error(&wis->is, 0);
+	if (waitpid(wis->pid, &status, 0) == wis->pid) {
+		wis->pid = 0;
+		return apk_istream_error(&wis->is, wget_translate_status(status));
+	}
+	return 0;
+}
+
+static void wget_get_meta(struct apk_istream *is, struct apk_file_meta *meta)
+{
+}
+
+static ssize_t wget_read(struct apk_istream *is, void *ptr, size_t size)
+{
+	struct apk_wget_istream *wis = container_of(is, struct apk_wget_istream, is);
+	ssize_t r;
+
+	r = read(wis->fd, ptr, size);
+	if (r < 0) return -errno;
+	if (r == 0) return wget_check_exit(wis);
+	return r;
+}
+
+static int wget_close(struct apk_istream *is)
+{
+	int r = is->err;
+	struct apk_wget_istream *wis = container_of(is, struct apk_wget_istream, is);
+
+	while (wis->pid != 0)
+		wget_check_exit(wis);
+
+	close(wis->fd);
+	free(wis);
+	return r < 0 ? r : 0;
+}
+
+static const struct apk_istream_ops wget_istream_ops = {
+	.get_meta = wget_get_meta,
+	.read = wget_read,
+	.close = wget_close,
+};
+
+struct apk_istream *apk_io_url_istream(const char *url, time_t since)
+{
+	struct apk_wget_istream *wis;
+	int r;
+
+	wis = malloc(sizeof(*wis) + apk_io_bufsize);
+	if (wis == NULL) return ERR_PTR(-ENOMEM);
+
+	*wis = (struct apk_wget_istream) {
+		.is.ops = &wget_istream_ops,
+		.is.buf = (uint8_t *)(wis + 1),
+		.is.buf_size = apk_io_bufsize,
+	};
+	r = wget_spawn(url, &wis->pid, &wis->fd);
+	if (r != 0) {
+		free(wis);
+		return ERR_PTR(r);
+	}
+
+	return &wis->is;
+}
+
+void apk_io_url_no_check_certificate(void)
+{
+}
+
+void apk_io_url_set_timeout(int timeout)
+{
+}
+
+void apk_io_url_set_redirect_callback(void (*cb)(int, const char *))
+{
+}
+
+void apk_io_url_init(void)
+{
+}
diff --git a/src/meson.build b/src/meson.build
index c1aae550..28bfce7e 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -22,7 +22,6 @@ libapk_src = [
 	'fs_uvol.c',
 	'hash.c',
 	'io.c',
-	'io_url_libfetch.c',
 	'io_gunzip.c',
 	'package.c',
 	'pathbuilder.c',
@@ -87,6 +86,13 @@ apk_src = [
 	'applet.c',
 ]
 
+url_backend = get_option('url_backend')
+if url_backend == 'libfetch'
+	libapk_src += [	'io_url_libfetch.c' ]
+elif url_backend == 'wget'
+	libapk_src += [	'io_url_wget.c' ]
+endif
+
 if lua_bin.found()
 	genhelp_script = files('genhelp.lua')
 	genhelp_args = [lua_bin, genhelp_script, '@INPUT@']
-- 
GitLab


From dc7ff789a45522eb847118a29b60b896de55d083 Mon Sep 17 00:00:00 2001
From: Jonas Jelonek <jelonek.jonas@gmail.com>
Date: Sun, 14 Apr 2024 00:20:14 +0200
Subject: [PATCH 2/2] crypto: add support for mbedtls as backend

backend is selected at compile-time with crypto_backend option

Co-developed-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
---
 libfetch/meson.build     |   2 +-
 meson.build              |  14 +-
 meson_options.txt        |   1 +
 src/apk_crypto.h         |   5 +
 src/apk_crypto_mbedtls.h |  26 ++++
 src/crypto_mbedtls.c     | 305 +++++++++++++++++++++++++++++++++++++++
 src/meson.build          |  23 ++-
 7 files changed, 364 insertions(+), 12 deletions(-)
 create mode 100644 src/apk_crypto_mbedtls.h
 create mode 100644 src/crypto_mbedtls.c

diff --git a/libfetch/meson.build b/libfetch/meson.build
index 431ba197..e24f95eb 100644
--- a/libfetch/meson.build
+++ b/libfetch/meson.build
@@ -40,7 +40,7 @@ libfetch = static_library(
 	c_args: libfetch_cargs,
 	dependencies: [
 		libportability_dep.partial_dependency(compile_args: true, includes: true),
-		openssl_dep.partial_dependency(compile_args: true, includes: true)
+		crypto_dep.partial_dependency(compile_args: true, includes: true)
 	],
 )
 
diff --git a/meson.build b/meson.build
index 9a14cac0..3a83f4e1 100644
--- a/meson.build
+++ b/meson.build
@@ -13,15 +13,21 @@ apk_libdir = get_option('libdir')
 lua_bin = find_program('lua' + get_option('lua_version'), required: get_option('help'))
 lua_dep = dependency('lua' + get_option('lua_version'), required: get_option('lua'))
 scdoc_dep = dependency('scdoc', version: '>=1.10', required: get_option('docs'))
-openssl_dep = dependency('openssl')
-openssl_static_dep = dependency('openssl', static: true)
 zlib_dep = dependency('zlib')
 zlib_static_dep = dependency('zlib', static: true)
 libzstd_dep = dependency('libzstd', required: get_option('zstd'))
 libzstd_static_dep = dependency('libzstd', required: get_option('zstd'), static: true)
 
-shared_deps = [ openssl_dep, zlib_dep, libzstd_dep ]
-static_deps = [ openssl_static_dep, zlib_static_dep, libzstd_static_dep ]
+if get_option('crypto_backend') == 'openssl'
+	crypto_dep = dependency('openssl')
+	crypto_static_dep = dependency('openssl', static: true)
+elif get_option('crypto_backend') == 'mbedtls'
+	crypto_dep = [ dependency('mbedtls'), dependency('mbedcrypto') ]
+	crypto_static_dep = [ dependency('mbedtls', static: true), dependency('mbedcrypto', static: true) ]
+endif
+
+shared_deps = [ crypto_dep, zlib_dep, libzstd_dep ]
+static_deps = [ crypto_static_dep, zlib_static_dep, libzstd_static_dep ]
 
 add_project_arguments('-D_GNU_SOURCE', language: 'c')
 
diff --git a/meson_options.txt b/meson_options.txt
index 44b88b32..2b1d24ce 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -5,6 +5,7 @@ option('help', description: 'Build help into apk binaries, needs lua', type: 'fe
 option('lua', description: 'Build luaapk (lua bindings)', type: 'feature', value: 'auto')
 option('lua_version', description: 'Lua version to build against', type: 'string', value: '5.3')
 option('static_apk', description: 'Also build apk.static', type: 'boolean', value: false)
+option('crypto_backend', description: 'SSL backend', type: 'string', value: 'openssl')
 option('url_backend', description: 'URL backend', type: 'string', value: 'libfetch')
 option('uvol_db_target', description: 'Default target for uvol database layer', type: 'string')
 option('zstd', description: 'Build with zstd support', type: 'boolean', value: true)
diff --git a/src/apk_crypto.h b/src/apk_crypto.h
index 7de88dfc..5cae3bfe 100644
--- a/src/apk_crypto.h
+++ b/src/apk_crypto.h
@@ -12,7 +12,12 @@
 #include <string.h>
 #include "apk_defines.h"
 #include "apk_blob.h"
+
+#if defined(CRYPTO_USE_OPENSSL)
 #include "apk_crypto_openssl.h"
+#elif defined(CRYPTO_USE_MBEDTLS)
+#include "apk_crypto_mbedtls.h"
+#endif
 
 // Digest
 
diff --git a/src/apk_crypto_mbedtls.h b/src/apk_crypto_mbedtls.h
new file mode 100644
index 00000000..e379535b
--- /dev/null
+++ b/src/apk_crypto_mbedtls.h
@@ -0,0 +1,26 @@
+/* apk_crypto_mbedtls.h - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2024
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ */
+
+#ifndef APK_CRYPTO_MBEDTLS_H
+#define APK_CRYPTO_MBEDTLS_H
+
+#include <mbedtls/md.h>
+#include <mbedtls/pk.h>
+
+struct apk_pkey {
+	uint8_t id[16];
+	mbedtls_pk_context *key;
+};
+
+struct apk_digest_ctx {
+	mbedtls_md_context_t *mdctx;
+	struct apk_pkey *sigver_key;
+	uint8_t alg;
+};
+
+#endif
diff --git a/src/crypto_mbedtls.c b/src/crypto_mbedtls.c
new file mode 100644
index 00000000..9ce148b5
--- /dev/null
+++ b/src/crypto_mbedtls.c
@@ -0,0 +1,305 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/random.h>
+
+#include <mbedtls/platform.h>
+#include <mbedtls/md.h>
+#include <mbedtls/pk.h>
+#include <mbedtls/entropy.h>
+#include <psa/crypto.h>
+
+#include "apk_crypto.h"
+
+static inline const mbedtls_md_type_t apk_digest_alg_to_mbedtls_type(uint8_t alg) {
+	switch (alg) {
+	case APK_DIGEST_NONE:	return MBEDTLS_MD_NONE;
+	case APK_DIGEST_MD5:	return MBEDTLS_MD_MD5;
+	case APK_DIGEST_SHA1:	return MBEDTLS_MD_SHA1;
+	case APK_DIGEST_SHA256_160:
+	case APK_DIGEST_SHA256:	return MBEDTLS_MD_SHA256;
+	case APK_DIGEST_SHA512:	return MBEDTLS_MD_SHA512;
+	default:
+		assert(alg);
+		return MBEDTLS_MD_NONE;
+	}
+}
+
+static inline const mbedtls_md_info_t *apk_digest_alg_to_mdinfo(uint8_t alg)
+{
+	return mbedtls_md_info_from_type(
+		apk_digest_alg_to_mbedtls_type(alg)
+	);
+}
+
+int apk_digest_calc(struct apk_digest *d, uint8_t alg, const void *ptr, size_t sz)
+{
+	if (mbedtls_md(apk_digest_alg_to_mdinfo(alg), ptr, sz, d->data))
+		return -APKE_CRYPTO_ERROR;
+
+	apk_digest_set(d, alg);
+	return 0;
+}
+
+int apk_digest_ctx_init(struct apk_digest_ctx *dctx, uint8_t alg)
+{
+	dctx->alg = alg;
+	dctx->mdctx = malloc(sizeof(mbedtls_md_context_t));
+
+	if (!dctx->mdctx) return -ENOMEM;
+
+	mbedtls_md_init(dctx->mdctx);
+	if (alg == APK_DIGEST_NONE) return 0;
+	if (mbedtls_md_setup(dctx->mdctx, apk_digest_alg_to_mdinfo(alg), 0) ||
+		mbedtls_md_starts(dctx->mdctx))
+		return -APKE_CRYPTO_ERROR;
+
+	return 0;
+}
+
+int apk_digest_ctx_reset(struct apk_digest_ctx *dctx)
+{
+	if (dctx->alg == APK_DIGEST_NONE) return 0;
+	if (mbedtls_md_starts(dctx->mdctx)) return -APKE_CRYPTO_ERROR;
+	return 0;
+}
+
+int apk_digest_ctx_reset_alg(struct apk_digest_ctx *dctx, uint8_t alg)
+{
+	mbedtls_md_free(dctx->mdctx);
+
+	dctx->alg = alg;
+	if (alg == APK_DIGEST_NONE) return 0;
+	if (mbedtls_md_setup(dctx->mdctx, apk_digest_alg_to_mdinfo(alg), 0) ||
+		mbedtls_md_starts(dctx->mdctx))
+		return -APKE_CRYPTO_ERROR;
+	
+	return 0;
+}
+
+void apk_digest_ctx_free(struct apk_digest_ctx *dctx)
+{
+	free(dctx->mdctx);
+	dctx->mdctx = 0;
+}
+
+int apk_digest_ctx_update(struct apk_digest_ctx *dctx, const void *ptr, size_t sz)
+{
+	if (dctx->alg == APK_DIGEST_NONE) return 0;
+	return mbedtls_md_update(dctx->mdctx, ptr, sz) == 0 ? 0 : -APKE_CRYPTO_ERROR;
+}
+
+int apk_digest_ctx_final(struct apk_digest_ctx *dctx, struct apk_digest *d)
+{
+	if (mbedtls_md_finish(dctx->mdctx, d->data)) {
+		apk_digest_reset(d);
+		return -APKE_CRYPTO_ERROR;
+	}
+
+	mbedtls_md_free(dctx->mdctx);
+
+	d->alg = dctx->alg;
+	d->len = apk_digest_alg_len(d->alg);
+	return 0;
+}
+
+// Entropy function adopted from ustream-ssl to avoid using the bloated mbedtls'
+// mbedtls_entropy_context and mbedtls_ctr_drbg_context.
+static int _apk_random(void *ctx, unsigned char *out, size_t len)
+{
+	static FILE *f;
+
+	if (!f)
+		f = fopen("/dev/urandom", "r");
+	if (fread(out, len, 1, f) != 1)
+		return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
+
+	return 0;
+}
+
+// adopted from mbedtls_pk_load_file
+static int apk_load_file_fd(int fd, unsigned char **buf, size_t *n)
+{
+	FILE *f;
+	long size;
+
+	if ((f = fdopen(fd, "rb")) == NULL) {
+		return MBEDTLS_ERR_PK_FILE_IO_ERROR;
+	}
+
+#if (MBEDTLS_VERSION_NUMBER >= 0x03000000)
+	/* Ensure no stdio buffering of secrets, as such buffers cannot be wiped. */
+	mbedtls_setbuf(f, NULL);
+#endif
+
+	fseek(f, 0, SEEK_END);
+	if ((size = ftell(f)) == -1) {
+		fclose(f);
+		return MBEDTLS_ERR_PK_FILE_IO_ERROR;
+	}
+	fseek(f, 0, SEEK_SET);
+
+	*n = (size_t) size;
+
+	if (*n + 1 == 0 ||
+		(*buf = mbedtls_calloc(1, *n + 1)) == NULL) {
+		fclose(f);
+		return MBEDTLS_ERR_PK_ALLOC_FAILED;
+	}
+
+	if (fread(*buf, 1, *n, f) != *n) {
+		fclose(f);
+
+		mbedtls_platform_zeroize(*buf, *n);
+		mbedtls_free(*buf);
+
+		return MBEDTLS_ERR_PK_FILE_IO_ERROR;
+	}
+
+	fclose(f);
+
+	(*buf)[*n] = '\0';
+
+	if (strstr((const char *) *buf, "-----BEGIN ") != NULL) {
+		++*n;
+	}
+
+	return 0;
+}
+
+static int apk_pkey_init(struct apk_pkey *pkey, mbedtls_pk_context *key)
+{
+	unsigned char dig[APK_DIGEST_MAX_LENGTH], *pub = NULL;
+	unsigned char *c;
+	int len, publen, r = -APKE_CRYPTO_ERROR;
+
+	// Assume byte len is always * 2 + NULL terminated
+	publen = mbedtls_pk_get_len(key) * 2 + 1;
+	pub = malloc(publen);
+	if (!pub)
+		return -ENOMEM;
+	c = pub + publen;
+
+	if ((len = mbedtls_pk_write_pubkey(&c, pub, key)) < 0) return -APKE_CRYPTO_ERROR;
+	if (!mbedtls_md(apk_digest_alg_to_mdinfo(APK_DIGEST_SHA512), pub, len, dig)) {
+		memcpy(pkey->id, dig, sizeof pkey->id);
+		r = 0;
+	}
+ 
+	free(pub);
+	pkey->key = key;
+ 
+	return r;
+}
+
+void apk_pkey_free(struct apk_pkey *pkey)
+{
+	mbedtls_pk_free(pkey->key);
+}
+
+int apk_pkey_load(struct apk_pkey *pkey, int dirfd, const char *fn)
+{
+	mbedtls_pk_context *key;
+	unsigned char *buf;
+	size_t blen;
+	int ret, fd;
+
+	fd = openat(dirfd, fn, O_RDONLY|O_CLOEXEC);
+	if (fd < 0)
+		return -errno;
+
+	key = malloc(sizeof *key);
+	if (!key)
+		return -ENOMEM;
+	
+	mbedtls_pk_init(key);
+	if (apk_load_file_fd(fd, &buf, &blen))
+		return -APKE_CRYPTO_ERROR;
+
+	if ((ret = mbedtls_pk_parse_public_key(key, buf, blen)) != 0) {
+#if (MBEDTLS_VERSION_NUMBER >= 0x03000000)
+		ret = mbedtls_pk_parse_key(key, buf, blen, NULL, 0, _apk_random, NULL);
+#else
+		ret = mbedtls_pk_parse_key(key, buf, blen, NULL, 0);
+#endif
+	}
+	mbedtls_platform_zeroize(buf, blen);
+	mbedtls_free(buf);
+	if (ret != 0)
+		return -APKE_CRYPTO_KEY_FORMAT;
+
+	return apk_pkey_init(pkey, key);
+}
+
+int apk_sign_start(struct apk_digest_ctx *dctx, uint8_t alg, struct apk_pkey *pkey)
+{
+	if (apk_digest_ctx_reset_alg(dctx, alg))
+		return -APKE_CRYPTO_ERROR;
+
+	dctx->sigver_key = pkey;
+
+	return 0;
+}
+
+int apk_sign(struct apk_digest_ctx *dctx, void *sig, size_t *len)
+{
+	struct apk_digest dig;
+	int r = 0;
+
+	if (apk_digest_ctx_final(dctx, &dig))
+		return -APKE_SIGNATURE_GEN_FAILURE;
+#if (MBEDTLS_VERSION_NUMBER >= 0x03000000)	
+	if (mbedtls_pk_sign(dctx->sigver_key->key, apk_digest_alg_to_mbedtls_type(dctx->alg),
+						&dig.data, dig.len, sig, sizeof *sig, len, _apk_random, NULL))
+#else
+	if (mbedtls_pk_sign(dctx->sigver_key->key, apk_digest_alg_to_mbedtls_type(dctx->alg),
+						&dig.data, dig.len, sig, len, _apk_random, NULL))
+#endif
+		r = -APKE_SIGNATURE_GEN_FAILURE;
+
+
+	dctx->sigver_key = NULL;
+	return r;
+}
+
+int apk_verify_start(struct apk_digest_ctx *dctx, uint8_t alg, struct apk_pkey *pkey)
+{
+	if (apk_digest_ctx_reset_alg(dctx, alg))
+		return -APKE_CRYPTO_ERROR;
+
+	dctx->sigver_key = pkey;
+
+	return 0;
+}
+
+int apk_verify(struct apk_digest_ctx *dctx, void *sig, size_t len)
+{
+	struct apk_digest dig;
+	int r = 0;
+
+	if (apk_digest_ctx_final(dctx, &dig))
+		return -APKE_SIGNATURE_GEN_FAILURE;
+
+	if (mbedtls_pk_verify(dctx->sigver_key->key, apk_digest_alg_to_mbedtls_type(dctx->alg), &dig.data, dig.len, sig, len))
+		r = -APKE_SIGNATURE_INVALID;
+
+	dctx->sigver_key = NULL;
+	return r;
+}
+
+static void apk_crypto_cleanup(void)
+{
+#ifdef MBEDTLS_PSA_CRYPTO_C
+	mbedtls_psa_crypto_free();
+#endif
+}
+
+void apk_crypto_init(void)
+{
+	atexit(apk_crypto_cleanup);
+	
+#ifdef MBEDTLS_PSA_CRYPTO_C
+	psa_crypto_init();
+#endif
+}
diff --git a/src/meson.build b/src/meson.build
index 28bfce7e..4eab6e0d 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -13,7 +13,6 @@ libapk_src = [
 	'common.c',
 	'context.c',
 	'crypto.c',
-	'crypto_openssl.c',
 	'ctype.c',
 	'database.c',
 	'extract_v2.c',
@@ -37,7 +36,6 @@ libapk_headers = [
 	'apk_atom.h',
 	'apk_blob.h',
 	'apk_crypto.h',
-	'apk_crypto_openssl.h',
 	'apk_ctype.h',
 	'apk_database.h',
 	'apk_defines.h',
@@ -86,6 +84,11 @@ apk_src = [
 	'applet.c',
 ]
 
+apk_cargs = [
+	'-DAPK_VERSION="' + meson.project_version() + '"',
+	'-D_ATFILE_SOURCE',
+]
+
 url_backend = get_option('url_backend')
 if url_backend == 'libfetch'
 	libapk_src += [	'io_url_libfetch.c' ]
@@ -93,6 +96,17 @@ elif url_backend == 'wget'
 	libapk_src += [	'io_url_wget.c' ]
 endif
 
+crypto_backend = get_option('crypto_backend')
+if crypto_backend == 'openssl'
+	apk_cargs += [ '-DCRYPTO_USE_OPENSSL' ]
+	libapk_src += [ 'crypto_openssl.c' ]
+	libapk_headers += [ 'apk_crypto_openssl.h' ]
+elif crypto_backend == 'mbedtls'
+	apk_cargs += [ '-DCRYPTO_USE_MBEDTLS' ]
+	libapk_src += [ 'crypto_mbedtls.c' ]
+	libapk_headers += [ 'apk_crypto_mbedtls.h' ]
+endif
+
 if lua_bin.found()
 	genhelp_script = files('genhelp.lua')
 	genhelp_args = [lua_bin, genhelp_script, '@INPUT@']
@@ -119,11 +133,6 @@ endif
 
 apk_src += [ generated_help ]
 
-apk_cargs = [
-	'-DAPK_VERSION="' + meson.project_version() + '"',
-	'-D_ATFILE_SOURCE',
-]
-
 apk_arch_prefix = get_option('arch_prefix')
 if apk_arch_prefix != ''
 	apk_cargs += ['-DAPK_ARCH_PREFIX="@0@"'.format(apk_arch_prefix)]
-- 
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