Merge pull request #6454 from bket/fix-benchmark-cpu

`borg benchmark cpu` fails with libressl

src/borg/archiver.py

@@ -591,19 +591,24 @@ class Archiver:
 
         from borg.crypto.low_level import AES256_CTR_BLAKE2b, AES256_CTR_HMAC_SHA256
         from borg.crypto.low_level import AES256_OCB, CHACHA20_POLY1305
+        from borg.crypto.low_level import is_libressl
         print("Encryption =====================================================")
         size = "1GB"
 
-        for spec, func in [
+        tests = [
             ("aes-256-ctr-hmac-sha256", lambda: AES256_CTR_HMAC_SHA256(
                 key_256, key_256, iv=key_128, header_len=1, aad_offset=1).encrypt(random_10M, header=b'X')),
             ("aes-256-ctr-blake2b", lambda: AES256_CTR_BLAKE2b(
                 key_256*4, key_256, iv=key_128, header_len=1, aad_offset=1).encrypt(random_10M, header=b'X')),
-            ("aes-256-ocb", lambda: AES256_OCB(
-                None, key_256, iv=key_96, header_len=1, aad_offset=1).encrypt(random_10M, header=b'X')),
-            ("chacha20-poly1305", lambda: CHACHA20_POLY1305(
-                None, key_256, iv=key_96, header_len=1, aad_offset=1).encrypt(random_10M, header=b'X')),
-        ]:
+        ]
+        if not is_libressl:
+            tests.extend([
+                ("aes-256-ocb", lambda: AES256_OCB(
+                    None, key_256, iv=key_96, header_len=1, aad_offset=1).encrypt(random_10M, header=b'X')),
+                ("chacha20-poly1305", lambda: CHACHA20_POLY1305(
+                    None, key_256, iv=key_96, header_len=1, aad_offset=1).encrypt(random_10M, header=b'X')),
+            ])
+        for spec, func in tests:
             print(f"{spec:<24} {size:<10} {timeit(func, number=100):.3f}s")
 
         from borg.compress import CompressionSpec