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Use setsockopt on the tfm FD to provide the authentication tag size for an AEAD cipher. This is achieved by adding a callback function which is intended to be used by the AEAD AF_ALG implementation. The optlen argument of the setsockopt specifies the authentication tag size to be used with the AEAD tfm. Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>