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authorStephan Müller <smueller@chronox.de>2021-11-19 07:55:58 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2021-11-26 16:25:17 +1100
commit026a733e66592e743a0905c7fd6b5d3bf89b2d7e (patch)
tree017fa67b601ebc24efc2c9bd8ccf4b6d074d2747 /crypto/Kconfig
parentb808f32023dd8127b0fa27f60fa69a959fd70388 (diff)
crypto: kdf - add SP800-108 counter key derivation function
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>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 285f82647d2b..01b9ca0836a5 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1845,6 +1845,10 @@ config CRYPTO_JITTERENTROPY
random numbers. This Jitterentropy RNG registers with
the kernel crypto API and can be used by any caller.
+config CRYPTO_KDF800108_CTR
+ tristate
+ select CRYPTO_HASH
+
config CRYPTO_USER_API
tristate