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crypto: drbg - remove configuration of fixed values

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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>
This commit is contained in:
Stephan Mueller 2014-08-17 17:41:10 +02:00 committed by Herbert Xu
parent bc034ef557
commit 05c81ccd90
2 changed files with 6 additions and 46 deletions
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33
crypto/drbg.c
View File

@ -117,27 +117,18 @@ static const struct drbg_core drbg_cores[] = {
{
.flags = DRBG_CTR | DRBG_STRENGTH128,
.statelen = 32, /* 256 bits as defined in 10.2.1 */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 16,
.cra_name = "ctr_aes128",
.backend_cra_name = "ecb(aes)",
}, {
.flags = DRBG_CTR | DRBG_STRENGTH192,
.statelen = 40, /* 320 bits as defined in 10.2.1 */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 16,
.cra_name = "ctr_aes192",
.backend_cra_name = "ecb(aes)",
}, {
.flags = DRBG_CTR | DRBG_STRENGTH256,
.statelen = 48, /* 384 bits as defined in 10.2.1 */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 16,
.cra_name = "ctr_aes256",
.backend_cra_name = "ecb(aes)",
@ -147,36 +138,24 @@ static const struct drbg_core drbg_cores[] = {
{
.flags = DRBG_HASH | DRBG_STRENGTH128,
.statelen = 55, /* 440 bits */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 20,
.cra_name = "sha1",
.backend_cra_name = "sha1",
}, {
.flags = DRBG_HASH | DRBG_STRENGTH256,
.statelen = 111, /* 888 bits */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 48,
.cra_name = "sha384",
.backend_cra_name = "sha384",
}, {
.flags = DRBG_HASH | DRBG_STRENGTH256,
.statelen = 111, /* 888 bits */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 64,
.cra_name = "sha512",
.backend_cra_name = "sha512",
}, {
.flags = DRBG_HASH | DRBG_STRENGTH256,
.statelen = 55, /* 440 bits */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 32,
.cra_name = "sha256",
.backend_cra_name = "sha256",
@ -186,36 +165,24 @@ static const struct drbg_core drbg_cores[] = {
{
.flags = DRBG_HMAC | DRBG_STRENGTH128,
.statelen = 20, /* block length of cipher */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 20,
.cra_name = "hmac_sha1",
.backend_cra_name = "hmac(sha1)",
}, {
.flags = DRBG_HMAC | DRBG_STRENGTH256,
.statelen = 48, /* block length of cipher */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 48,
.cra_name = "hmac_sha384",
.backend_cra_name = "hmac(sha384)",
}, {
.flags = DRBG_HMAC | DRBG_STRENGTH256,
.statelen = 64, /* block length of cipher */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 64,
.cra_name = "hmac_sha512",
.backend_cra_name = "hmac(sha512)",
}, {
.flags = DRBG_HMAC | DRBG_STRENGTH256,
.statelen = 32, /* block length of cipher */
.max_addtllen = 35,
.max_bits = 19,
.max_req = 48,
.blocklen_bytes = 32,
.cra_name = "hmac_sha256",
.backend_cra_name = "hmac(sha256)",

19
include/crypto/drbg.h
View File

@ -82,15 +82,6 @@ typedef uint32_t drbg_flag_t;
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 __u8 drbg_keylen(struct drbg_state *drbg)
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);
}
/*