[tarantool-patches] [PATCH v2 3/3] crypto: implement crypto codec API and AES 128 encryption
Vladislav Shpilevoy
v.shpilevoy at tarantool.org
Mon Apr 29 14:07:39 MSK 2019
OpenSSL API is quite complex and hard to follow, additionally it
is very unstable. Encoding/decoding via OpenSSL methods usually
consists of multiple calls of a lot of functions. This patch
wraps OpenSSL API with one more easy to use and conforming
Tarantool code style in scope of crypto library.
The API provides struct crypto_codec which encapsulates all the
encryption logic and exposes quite simple API like this:
crypto_codec_encode/decode(in, in_size, out, out_size)
A caller can create a needed codec via crypto_codec_new, which
now supports only AES 128 algorithm. The reason behind such a
choice is simple - it is needed in SWIM now.
The API is flexible in terms of extending and adding new
algorithms in future.
Needed for #3234
---
src/lib/core/diag.h | 2 +
src/lib/core/exception.cc | 25 +++++
src/lib/core/exception.h | 7 ++
src/lib/crypto/CMakeLists.txt | 2 +-
src/lib/crypto/crypto.c | 144 +++++++++++++++++++++++++
src/lib/crypto/crypto.h | 94 +++++++++++++++++
test/unit/CMakeLists.txt | 3 +
test/unit/crypto.c | 191 ++++++++++++++++++++++++++++++++++
test/unit/crypto.result | 40 +++++++
9 files changed, 507 insertions(+), 1 deletion(-)
create mode 100644 test/unit/crypto.c
create mode 100644 test/unit/crypto.result
diff --git a/src/lib/core/diag.h b/src/lib/core/diag.h
index 78f0cdbdf..fd3831e66 100644
--- a/src/lib/core/diag.h
+++ b/src/lib/core/diag.h
@@ -251,6 +251,8 @@ struct error *
BuildCollationError(const char *file, unsigned line, const char *format, ...);
struct error *
BuildSwimError(const char *file, unsigned line, const char *format, ...);
+struct error *
+BuildCryptoError(const char *file, unsigned line, const char *format, ...);
struct index_def;
diff --git a/src/lib/core/exception.cc b/src/lib/core/exception.cc
index 6124c70d0..a6999af43 100644
--- a/src/lib/core/exception.cc
+++ b/src/lib/core/exception.cc
@@ -280,6 +280,19 @@ SwimError::SwimError(const char *file, unsigned line, const char *format, ...)
va_end(ap);
}
+const struct type_info type_CryptoError =
+ make_type("CryptoError", &type_Exception);
+
+CryptoError::CryptoError(const char *file, unsigned line,
+ const char *format, ...)
+ : Exception(&type_CryptoError, file, line)
+{
+ va_list ap;
+ va_start(ap, format);
+ error_vformat_msg(this, format, ap);
+ va_end(ap);
+}
+
#define BuildAlloc(type) \
void *p = malloc(sizeof(type)); \
if (p == NULL) \
@@ -371,6 +384,18 @@ BuildSwimError(const char *file, unsigned line, const char *format, ...)
return e;
}
+struct error *
+BuildCryptoError(const char *file, unsigned line, const char *format, ...)
+{
+ BuildAlloc(CryptoError);
+ CryptoError *e = new (p) CryptoError(file, line, "");
+ va_list ap;
+ va_start(ap, format);
+ error_vformat_msg(e, format, ap);
+ va_end(ap);
+ return e;
+}
+
struct error *
BuildSocketError(const char *file, unsigned line, const char *socketname,
const char *format, ...)
diff --git a/src/lib/core/exception.h b/src/lib/core/exception.h
index 4f5b66f2e..a29281427 100644
--- a/src/lib/core/exception.h
+++ b/src/lib/core/exception.h
@@ -51,6 +51,7 @@ extern const struct type_info type_IllegalParams;
extern const struct type_info type_SystemError;
extern const struct type_info type_CollationError;
extern const struct type_info type_SwimError;
+extern const struct type_info type_CryptoError;
const char *
exception_get_string(struct error *e, const struct method_info *method);
@@ -166,6 +167,12 @@ public:
virtual void raise() { throw this; }
};
+class CryptoError: public Exception {
+public:
+ CryptoError(const char *file, unsigned line, const char *format, ...);
+ virtual void raise() { throw this; }
+};
+
/**
* Initialize the exception subsystem.
*/
diff --git a/src/lib/crypto/CMakeLists.txt b/src/lib/crypto/CMakeLists.txt
index 7e2c6e1d3..4e2e5e403 100644
--- a/src/lib/crypto/CMakeLists.txt
+++ b/src/lib/crypto/CMakeLists.txt
@@ -2,4 +2,4 @@ set(lib_sources crypto.c)
set_source_files_compile_flags(${lib_sources})
add_library(crypto STATIC ${lib_sources})
-target_link_libraries(crypto ${OPENSSL_LIBRARIES})
+target_link_libraries(crypto ${OPENSSL_LIBRARIES} core)
diff --git a/src/lib/crypto/crypto.c b/src/lib/crypto/crypto.c
index 4b192ba2d..a96963d6f 100644
--- a/src/lib/crypto/crypto.c
+++ b/src/lib/crypto/crypto.c
@@ -29,12 +29,156 @@
* SUCH DAMAGE.
*/
#include "crypto.h"
+#include "diag.h"
+#include "exception.h"
+#include "core/random.h"
#include <openssl/crypto.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/hmac.h>
+/** Set a diag error with the latest OpenSSL error message. */
+static inline void
+diag_set_OpenSSL(void)
+{
+ diag_set(CryptoError, "OpenSSL error: %s",
+ ERR_error_string(ERR_get_error(), NULL));
+}
+
+/**
+ * OpenSSL codec. It contains only key, initial vector, and a
+ * constant cipher type, because OpenSSL does not allow
+ * long-living EVP_CIPHER_CTX contexts.
+ */
+struct crypto_codec {
+ /**
+ * Secret key, usually is unchanged among multiple data
+ * packets. Only AES 128 is supported now, so the buffer
+ * is of 16 byte size.
+ */
+ unsigned char key[CRYPTO_AES128_KEY_SIZE];
+ /**
+ * Initial vector, and in fact a public key. It should be
+ * regenerated randomly for each data packet.
+ */
+ unsigned char iv[CRYPTO_AES_IV_SIZE];
+ /** Size of block by which the algorithm operates. */
+ uint8_t block_size;
+ /** Cipher type. Depends on algorithm and key size. */
+ const EVP_CIPHER *type;
+};
+
+struct crypto_codec *
+crypto_codec_new(enum crypto_algo algo, const char *key)
+{
+ struct crypto_codec *c = (struct crypto_codec *) malloc(sizeof(*c));
+ if (c == NULL) {
+ diag_set(OutOfMemory, sizeof(*c), "malloc", "c");
+ return NULL;
+ }
+ switch (algo) {
+ case CRYPTO_AES128:
+ memcpy(c->key, key, sizeof(c->key));
+ memset(c->iv, 0, sizeof(c->iv));
+ c->type = EVP_aes_128_cbc();
+ break;
+ case CRYPTO_NONE:
+ c->type = EVP_enc_null();
+ break;
+ default:
+ free(c);
+ diag_set(CryptoError, "only 'none' and AES 128 are supported");
+ return NULL;
+ }
+ c->block_size = EVP_CIPHER_block_size(c->type);
+ return c;
+}
+
+const char *
+crypto_codec_gen_iv(struct crypto_codec *c)
+{
+ random_bytes((char *) c->iv, sizeof(c->iv));
+ return (char *) c->iv;
+}
+
+int
+crypto_codec_encrypt(struct crypto_codec *c, const char *in, int in_size,
+ char *out, int out_size)
+{
+ const unsigned char *uin = (const unsigned char *) in;
+ unsigned char *uout = (unsigned char *) out;
+ /*
+ * Note, that even if in_size is already multiple of block
+ * size, additional block is still needed. Result is
+ * almost always bigger than input. OpenSSL API advises to
+ * provide buffer of one block bigger than the data to
+ * encode.
+ */
+ int len, result, need = in_size + c->block_size;
+ if (need > out_size)
+ return need;
+
+ EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
+ if (ctx == NULL)
+ goto error;
+ if (EVP_EncryptInit_ex(ctx, c->type, NULL, c->key, c->iv) != 1)
+ goto error;
+ if (EVP_EncryptUpdate(ctx, uout, &len, uin, in_size) != 1)
+ goto error;
+ result = len;
+ assert(result <= need);
+ if (EVP_EncryptFinal_ex(ctx, uout + result, &len) != 1)
+ goto error;
+ result += len;
+ assert(result <= need);
+ EVP_CIPHER_CTX_free(ctx);
+ return result;
+
+error:
+ diag_set_OpenSSL();
+ if (ctx != NULL)
+ EVP_CIPHER_CTX_free(ctx);
+ return -1;
+}
+
+int
+crypto_codec_decrypt(struct crypto_codec *c, const char *iv,
+ const char *in, int in_size, char *out, int out_size)
+{
+ if (in_size > out_size)
+ return in_size;
+ const unsigned char *uin = (const unsigned char *) in;
+ const unsigned char *uiv = (const unsigned char *) iv;
+ unsigned char *uout = (unsigned char *) out;
+ int len, result;
+
+ EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
+ if (ctx == NULL)
+ goto error;
+ if (EVP_DecryptInit_ex(ctx, c->type, NULL, c->key, uiv) != 1)
+ goto error;
+ if (EVP_DecryptUpdate(ctx, uout, &len, uin, in_size) != 1)
+ goto error;
+ result = len;
+ if (EVP_DecryptFinal_ex(ctx, uout + result, &len) != 1)
+ goto error;
+ EVP_CIPHER_CTX_free(ctx);
+ return result + len;
+
+error:
+ diag_set_OpenSSL();
+ if (ctx != NULL)
+ EVP_CIPHER_CTX_free(ctx);
+ return -1;
+}
+
+void
+crypto_codec_delete(struct crypto_codec *c)
+{
+ free(c);
+}
+
void
crypto_init(void)
{
diff --git a/src/lib/crypto/crypto.h b/src/lib/crypto/crypto.h
index bc807e1a2..c679c39f7 100644
--- a/src/lib/crypto/crypto.h
+++ b/src/lib/crypto/crypto.h
@@ -35,6 +35,100 @@
extern "C" {
#endif
+enum crypto_algo {
+ /** None to disable encryption. */
+ CRYPTO_NONE,
+ /**
+ * AES - Advanced Encryption Standard. It is a symmetric
+ * key block cipher algorithm. AES encodes data in blocks
+ * of 128 bits, for what it uses a key and an initial
+ * vector. The key is a secret information which needs to
+ * be shared among communicating nodes. Key size can be
+ * 128, 192 and 256 bits. Initial vector is an additional
+ * entropy factor to prevent an attack when an attacker
+ * somehow learns a purpose or content of one data packet
+ * and immediately learns purpose of all the same looking
+ * packets. Initial vector should be generated randomly
+ * for each data packet, nonetheless it is not private and
+ * can be sent without encryption.
+ */
+ CRYPTO_AES128,
+};
+
+/**
+ * Values obtained from EVP_CIPHER_*() API, but the constants are
+ * needed in some places at compilation time. For example, for
+ * statically sized buffers.
+ */
+enum {
+ /**
+ * Block size of AES operation. Encrypted data size is
+ * always divisible by this value.
+ */
+ CRYPTO_AES_BLOCK_SIZE = 16,
+ /**
+ * Size of AES initial vector. It does not depend on key
+ * size.
+ */
+ CRYPTO_AES_IV_SIZE = 16,
+ /**
+ * Obviously, 128 bits = 16 bytes always. It is just
+ * syntax sugar so as not to hardcode 16 everywhere.
+ */
+ CRYPTO_AES128_KEY_SIZE = 16,
+};
+
+struct crypto_codec;
+
+/**
+ * Create a new codec working with a specified @a algo algorithm
+ * and a secret @a key. Size of @a key depends on the chosen
+ * algorithm.
+ */
+struct crypto_codec *
+crypto_codec_new(enum crypto_algo algo, const char *key);
+
+/** Generate a new initial vector and return it. */
+const char *
+crypto_codec_gen_iv(struct crypto_codec *c);
+
+/**
+ * Encrypt plain data by codec @a c.
+ * @param c Codec.
+ * @param in Plain input data.
+ * @param in_size Byte size of @a in.
+ * @param out Output buffer.
+ * @param out_size Byte size of @a out.
+ *
+ * @retval -1 Error. Diag is set.
+ * @return Number of written bytes. If > @a out_size then nothing
+ * is written, needed number of bytes is returned.
+ */
+int
+crypto_codec_encrypt(struct crypto_codec *c, const char *in, int in_size,
+ char *out, int out_size);
+
+/**
+ * Decrypt cipher by codec @a c.
+ * @param c Codec.
+ * @param iv Initial vector used to encode @a in.
+ * @param in Cipher to decode.
+ * @param in_size Byte size of @a in.
+ * @param out Output buffer.
+ * @param out_size Byte size of @a out.
+ *
+ * @retval -1 Error. Diag is set.
+ * @return Number of written bytes. If > @a out_size then nothing
+ * is written, needed number of bytes is returned.
+ */
+int
+crypto_codec_decrypt(struct crypto_codec *c, const char *iv,
+ const char *in, int in_size, char *out, int out_size);
+
+/** Delete codec. */
+void
+crypto_codec_delete(struct crypto_codec *c);
+
void
crypto_init(void);
diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
index bb88b9c9b..368ceb649 100644
--- a/test/unit/CMakeLists.txt
+++ b/test/unit/CMakeLists.txt
@@ -213,6 +213,9 @@ target_link_libraries(checkpoint_schedule.test m unit)
add_executable(sio.test sio.c)
target_link_libraries(sio.test unit core)
+add_executable(crypto.test crypto.c)
+target_link_libraries(crypto.test crypto unit)
+
add_executable(swim.test swim.c swim_test_transport.c swim_test_ev.c
swim_test_utils.c ${PROJECT_SOURCE_DIR}/src/version.c)
target_link_libraries(swim.test unit swim)
diff --git a/test/unit/crypto.c b/test/unit/crypto.c
new file mode 100644
index 000000000..092650543
--- /dev/null
+++ b/test/unit/crypto.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright 2010-2019, Tarantool AUTHORS, please see AUTHORS file.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``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
+ * <COPYRIGHT HOLDER> 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.
+ */
+#include "crypto/crypto.h"
+#include "core/random.h"
+#include "unit.h"
+#include "trivia/util.h"
+#include "memory.h"
+#include "fiber.h"
+
+static void
+test_aes128_codec(void)
+{
+ header();
+ plan(19);
+
+ char key[CRYPTO_AES128_KEY_SIZE];
+ random_bytes(key, sizeof(key));
+ struct crypto_codec *c = crypto_codec_new(CRYPTO_AES128, key);
+
+ int rc = crypto_codec_encrypt(c, NULL, 10, NULL, 0);
+ is(rc, 26, "encrypt returns needed number of bytes");
+ rc = crypto_codec_encrypt(c, NULL, 10, NULL, 15);
+ is(rc, 26, "encrypt does not write anything when too small "\
+ "buffer");
+ rc = crypto_codec_encrypt(c, NULL, 0, NULL, 0);
+ is(rc, 16, "encrypt does not allow 0 sized buffer");
+ rc = crypto_codec_encrypt(c, NULL, 32, NULL, 0);
+ is(rc, 48, "encrypt requires additional block when buffer "\
+ "size is multiple of block size");
+
+ const char *plain = "plain text";
+ int plain_size = strlen(plain) + 1;
+ char buffer1[128], buffer2[128];
+ memset(buffer1, 0, sizeof(buffer1));
+ memset(buffer2, 0, sizeof(buffer2));
+ int buffer_size = sizeof(buffer1);
+ const char *iv = crypto_codec_gen_iv(c);
+
+ rc = crypto_codec_encrypt(c, plain, plain_size, buffer1, buffer_size);
+ is(rc, 16, "encrypt works when buffer is big enough");
+ rc = crypto_codec_encrypt(c, plain, plain_size, buffer2, buffer_size);
+ is(rc, 16, "encrypt returns the same on second call");
+ is(memcmp(buffer1, buffer2, rc), 0, "encrypted data is the same");
+ isnt(memcmp(buffer1, plain, plain_size), 0,
+ "and it is not just copied from the plain text");
+
+ rc = crypto_codec_decrypt(c, iv, NULL, 16, NULL, 0);
+ is(rc, 16, "decrypt also checks length and returns needed number "\
+ "of bytes");
+ rc = crypto_codec_decrypt(c, iv, buffer1, 16, buffer2, buffer_size);
+ is(rc, plain_size, "decrypt returns correct number of bytes");
+ is(memcmp(buffer2, plain, plain_size), 0,
+ "and correctly decrypts data");
+
+ rc = crypto_codec_decrypt(c, "false iv not meaning anything",
+ buffer1, 16, buffer2, buffer_size);
+ is(rc, -1, "decrypt can fail with wrong IV");
+ ok(! diag_is_empty(diag_get()), "diag error is set");
+
+ const char *iv2 = crypto_codec_gen_iv(c);
+ rc = crypto_codec_encrypt(c, plain, plain_size, buffer2, buffer_size);
+ is(rc, 16, "encrypt with different IV and the same number of written "\
+ "bytes returned")
+ isnt(memcmp(buffer2, buffer1, rc), 0,
+ "the encrypted data looks different");
+ rc = crypto_codec_decrypt(c, iv2, buffer2, 16, buffer1, buffer_size);
+ is(rc, plain_size, "decrypt works with correct but another IV");
+ is(memcmp(buffer1, plain, plain_size), 0, "data is the same");
+
+ struct crypto_codec *c2 = crypto_codec_new(CRYPTO_AES128, key);
+ rc = crypto_codec_encrypt(c, plain, plain_size, buffer1, buffer_size);
+ memset(buffer2, 0, rc);
+ rc = crypto_codec_decrypt(c2, iv2, buffer1, rc, buffer2, buffer_size);
+ is(rc, plain_size, "encrypt with one codec, but decrypt with another "\
+ "codec and the same key");
+ is(memcmp(plain, buffer2, plain_size), 0, "data is the same");
+
+ crypto_codec_delete(c2);
+ crypto_codec_delete(c);
+
+ check_plan();
+ footer();
+}
+
+static void
+test_aes128_stress(void)
+{
+ header();
+ plan(1);
+ char key[CRYPTO_AES128_KEY_SIZE];
+ random_bytes(key, sizeof(key));
+ struct crypto_codec *c = crypto_codec_new(CRYPTO_AES128, key);
+
+ char plain[515], cipher[1024], result[1024];
+ int rc, size = 10;
+ for (int size = 10; size < (int) sizeof(plain); size += 10) {
+ random_bytes(plain, size);
+ const char *iv = crypto_codec_gen_iv(c);
+ rc = crypto_codec_encrypt(c, plain, size,
+ cipher, sizeof(cipher));
+ rc = crypto_codec_decrypt(c, iv, cipher, rc,
+ result, sizeof(result));
+ fail_if(memcmp(result, plain, rc) != 0);
+ }
+ ok(true, "try encrypt/decrypt on a variety of sizes, keys, and ivs");
+
+ check_plan();
+ crypto_codec_delete(c);
+ footer();
+}
+
+static void
+test_none_codec(void)
+{
+ header();
+ plan(4);
+
+ struct crypto_codec *c = crypto_codec_new(CRYPTO_NONE, NULL);
+ const char *plain = "plain text";
+ int plain_size = strlen(plain) + 1;
+ char buffer1[128], buffer2[128];
+ const char *iv = crypto_codec_gen_iv(c);
+ int rc = crypto_codec_encrypt(c, plain, plain_size,
+ buffer1, sizeof(buffer1));
+ is(rc, plain_size, "'none' codec does not require more space "\
+ "than the data");
+ is(memcmp(buffer1, plain, plain_size), 0, "data is just copied");
+ rc = crypto_codec_decrypt(c, iv, buffer1, rc, buffer2, sizeof(buffer2));
+ is(rc, plain_size, "'decrypt' does the same");
+ is(memcmp(buffer2, plain, plain_size), 0, "data is copied back");
+
+ crypto_codec_delete(c);
+
+ check_plan();
+ footer();
+}
+
+int
+main(void)
+{
+ header();
+ plan(4);
+ random_init();
+ crypto_init();
+ memory_init();
+ fiber_init(fiber_c_invoke);
+
+ struct crypto_codec *c = crypto_codec_new(-1, "1234");
+ is(c, NULL, "crypto checks that algo argument is correct");
+ crypto_codec_delete(c);
+
+ test_aes128_codec();
+ test_aes128_stress();
+ test_none_codec();
+
+ fiber_free();
+ memory_free();
+ crypto_free();
+ random_free();
+ int rc = check_plan();
+ footer();
+ return rc;
+}
diff --git a/test/unit/crypto.result b/test/unit/crypto.result
new file mode 100644
index 000000000..de55fd2e4
--- /dev/null
+++ b/test/unit/crypto.result
@@ -0,0 +1,40 @@
+ *** main ***
+1..4
+ok 1 - crypto checks that algo argument is correct
+ *** test_aes128_codec ***
+ 1..19
+ ok 1 - encrypt returns needed number of bytes
+ ok 2 - encrypt does not write anything when too small buffer
+ ok 3 - encrypt does not allow 0 sized buffer
+ ok 4 - encrypt requires additional block when buffer size is multiple of block size
+ ok 5 - encrypt works when buffer is big enough
+ ok 6 - encrypt returns the same on second call
+ ok 7 - encrypted data is the same
+ ok 8 - and it is not just copied from the plain text
+ ok 9 - decrypt also checks length and returns needed number of bytes
+ ok 10 - decrypt returns correct number of bytes
+ ok 11 - and correctly decrypts data
+ ok 12 - decrypt can fail with wrong IV
+ ok 13 - diag error is set
+ ok 14 - encrypt with different IV and the same number of written bytes returned
+ ok 15 - the encrypted data looks different
+ ok 16 - decrypt works with correct but another IV
+ ok 17 - data is the same
+ ok 18 - encrypt with one codec, but decrypt with another codec and the same key
+ ok 19 - data is the same
+ok 2 - subtests
+ *** test_aes128_codec: done ***
+ *** test_aes128_stress ***
+ 1..1
+ ok 1 - try encrypt/decrypt on a variety of sizes, keys, and ivs
+ok 3 - subtests
+ *** test_aes128_stress: done ***
+ *** test_none_codec ***
+ 1..4
+ ok 1 - 'none' codec does not require more space than the data
+ ok 2 - data is just copied
+ ok 3 - 'decrypt' does the same
+ ok 4 - data is copied back
+ok 4 - subtests
+ *** test_none_codec: done ***
+ *** main: done ***
--
2.20.1 (Apple Git-117)
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