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2022-11-25crypto: kdf - silence noisy self-testEric Biggers1-1/+1
Make the kdf_sp800108 self-test only print a message on success when fips_enabled, so that it's consistent with testmgr.c and doesn't spam the kernel log with a message that isn't really important. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2022-11-25crypto: kdf - skip self-test when tests disabledEric Biggers1-2/+6
Make kdf_sp800108 honor the CONFIG_CRYPTO_MANAGER_DISABLE_TESTS kconfig option, so that it doesn't always waste time running its self-test. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2021-11-26crypto: kdf - add SP800-108 counter key derivation functionStephan Müller1-0/+153
SP800-108 defines three KDFs - this patch provides the counter KDF implementation. The KDF is implemented as a service function where the caller has to maintain the hash / HMAC state. Apart from this hash/HMAC state, no additional state is required to be maintained by either the caller or the KDF implementation. The key for the KDF is set with the crypto_kdf108_setkey function which is intended to be invoked before the caller requests a key derivation operation via crypto_kdf108_ctr_generate. SP800-108 allows the use of either a HMAC or a hash as crypto primitive for the KDF. When a HMAC primtive is intended to be used, crypto_kdf108_setkey must be used to set the HMAC key. Otherwise, for a hash crypto primitve crypto_kdf108_ctr_generate can be used immediately after allocating the hash handle. Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>