crypto: drbg - remove configuration of fixed values
SP800-90A mandates several hard-coded values. The old drbg_cores allows
the setting of these values per DRBG implementation. However, due to the
hard requirement of SP800-90A, these values are now returned globally
for each DRBG.
The ability to set such values per DRBG is therefore removed.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 831d786..3d8e73a 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -82,15 +82,6 @@
struct drbg_core {
drbg_flag_t flags; /* flags for the cipher */
__u8 statelen; /* maximum state length */
- /*
- * maximum length of personalization string or additional input
- * string -- exponent for base 2
- */
- __u8 max_addtllen;
- /* maximum bits per RNG request -- exponent for base 2*/
- __u8 max_bits;
- /* maximum number of requests -- exponent for base 2 */
- __u8 max_req;
__u8 blocklen_bytes; /* block size of output in bytes */
char cra_name[CRYPTO_MAX_ALG_NAME]; /* mapping to kernel crypto API */
/* kernel crypto API backend cipher name */
@@ -156,18 +147,20 @@
static inline size_t drbg_max_request_bytes(struct drbg_state *drbg)
{
- /* max_bits is in bits, but buflen is in bytes */
- return (1 << (drbg->core->max_bits - 3));
+ /* SP800-90A requires the limit 2**19 bits, but we return bytes */
+ return (1 << 16);
}
static inline size_t drbg_max_addtl(struct drbg_state *drbg)
{
- return (1UL<<(drbg->core->max_addtllen));
+ /* SP800-90A requires 2**35 bytes additional info str / pers str */
+ return (1UL<<35);
}
static inline size_t drbg_max_requests(struct drbg_state *drbg)
{
- return (1UL<<(drbg->core->max_req));
+ /* SP800-90A requires 2**48 maximum requests before reseeding */
+ return (1UL<<48);
}
/*
