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-rw-r--r--cryptography/hazmat/bindings/openssl/backend.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/cryptography/hazmat/bindings/openssl/backend.py b/cryptography/hazmat/bindings/openssl/backend.py
index 300495cb..db5a9e1e 100644
--- a/cryptography/hazmat/bindings/openssl/backend.py
+++ b/cryptography/hazmat/bindings/openssl/backend.py
@@ -287,6 +287,7 @@ class HMACs(object):
buflen[0] = digest_size
res = self._backend.lib.HMAC_Final(ctx, buf, buflen)
assert res != 0
+ self._backend.lib.HMAC_CTX_cleanup(ctx)
return self._backend.ffi.buffer(buf)[:digest_size]
def copy_ctx(self, ctx):