diff options
| -rw-r--r-- | crypto/drbg.c | 103 |
1 files changed, 55 insertions, 48 deletions
diff --git a/crypto/drbg.c b/crypto/drbg.c index 57fd479b8f77..5bce15918de5 100644 --- a/crypto/drbg.c +++ b/crypto/drbg.c @@ -1136,6 +1136,8 @@ static inline void drbg_dealloc_state(struct drbg_state *drbg) kzfree(drbg->scratchpad); drbg->scratchpad = NULL; drbg->reseed_ctr = 0; + drbg->d_ops = NULL; + drbg->core = NULL; #ifdef CONFIG_CRYPTO_FIPS kzfree(drbg->prev); drbg->prev = NULL; @@ -1152,6 +1154,27 @@ static inline int drbg_alloc_state(struct drbg_state *drbg) int ret = -ENOMEM; unsigned int sb_size = 0; + switch (drbg->core->flags & DRBG_TYPE_MASK) { +#ifdef CONFIG_CRYPTO_DRBG_HMAC + case DRBG_HMAC: + drbg->d_ops = &drbg_hmac_ops; + break; +#endif /* CONFIG_CRYPTO_DRBG_HMAC */ +#ifdef CONFIG_CRYPTO_DRBG_HASH + case DRBG_HASH: + drbg->d_ops = &drbg_hash_ops; + break; +#endif /* CONFIG_CRYPTO_DRBG_HASH */ +#ifdef CONFIG_CRYPTO_DRBG_CTR + case DRBG_CTR: + drbg->d_ops = &drbg_ctr_ops; + break; +#endif /* CONFIG_CRYPTO_DRBG_CTR */ + default: + ret = -EOPNOTSUPP; + goto err; + } + drbg->V = kmalloc(drbg_statelen(drbg), GFP_KERNEL); if (!drbg->V) goto err; @@ -1215,6 +1238,10 @@ static int drbg_generate(struct drbg_state *drbg, int len = 0; LIST_HEAD(addtllist); + if (!drbg->core) { + pr_devel("DRBG: not yet seeded\n"); + return -EINVAL; + } if (0 == buflen || !buf) { pr_devel("DRBG: no output buffer provided\n"); return -EINVAL; @@ -1372,33 +1399,12 @@ static int drbg_generate_long(struct drbg_state *drbg, static int drbg_instantiate(struct drbg_state *drbg, struct drbg_string *pers, int coreref, bool pr) { - int ret = -EOPNOTSUPP; + int ret; + bool reseed = true; pr_devel("DRBG: Initializing DRBG core %d with prediction resistance " "%s\n", coreref, pr ? "enabled" : "disabled"); mutex_lock(&drbg->drbg_mutex); - drbg->core = &drbg_cores[coreref]; - drbg->pr = pr; - drbg->seeded = false; - switch (drbg->core->flags & DRBG_TYPE_MASK) { -#ifdef CONFIG_CRYPTO_DRBG_HMAC - case DRBG_HMAC: - drbg->d_ops = &drbg_hmac_ops; - break; -#endif /* CONFIG_CRYPTO_DRBG_HMAC */ -#ifdef CONFIG_CRYPTO_DRBG_HASH - case DRBG_HASH: - drbg->d_ops = &drbg_hash_ops; - break; -#endif /* CONFIG_CRYPTO_DRBG_HASH */ -#ifdef CONFIG_CRYPTO_DRBG_CTR - case DRBG_CTR: - drbg->d_ops = &drbg_ctr_ops; - break; -#endif /* CONFIG_CRYPTO_DRBG_CTR */ - default: - goto unlock; - } /* 9.1 step 1 is implicit with the selected DRBG type */ @@ -1410,21 +1416,31 @@ static int drbg_instantiate(struct drbg_state *drbg, struct drbg_string *pers, /* 9.1 step 4 is implicit in drbg_sec_strength */ - ret = drbg_alloc_state(drbg); - if (ret) - goto unlock; + if (!drbg->core) { + drbg->core = &drbg_cores[coreref]; + drbg->pr = pr; + drbg->seeded = false; - ret = -EFAULT; - if (drbg->d_ops->crypto_init(drbg)) - goto err; - ret = drbg_seed(drbg, pers, false); - if (ret) { + ret = drbg_alloc_state(drbg); + if (ret) + goto unlock; + + ret = -EFAULT; + if (drbg->d_ops->crypto_init(drbg)) + goto err; + + reseed = false; + } + + ret = drbg_seed(drbg, pers, reseed); + + if (ret && !reseed) { drbg->d_ops->crypto_fini(drbg); goto err; } mutex_unlock(&drbg->drbg_mutex); - return 0; + return ret; err: drbg_dealloc_state(drbg); @@ -1444,11 +1460,10 @@ unlock: */ static int drbg_uninstantiate(struct drbg_state *drbg) { - mutex_lock(&drbg->drbg_mutex); - drbg->d_ops->crypto_fini(drbg); + if (drbg->d_ops) + drbg->d_ops->crypto_fini(drbg); drbg_dealloc_state(drbg); /* no scrubbing of test_data -- this shall survive an uninstantiate */ - mutex_unlock(&drbg->drbg_mutex); return 0; } @@ -1615,16 +1630,10 @@ static inline void drbg_convert_tfm_core(const char *cra_driver_name, static int drbg_kcapi_init(struct crypto_tfm *tfm) { struct drbg_state *drbg = crypto_tfm_ctx(tfm); - bool pr = false; - int coreref = 0; mutex_init(&drbg->drbg_mutex); - drbg_convert_tfm_core(crypto_tfm_alg_driver_name(tfm), &coreref, &pr); - /* - * when personalization string is needed, the caller must call reset - * and provide the personalization string as seed information - */ - return drbg_instantiate(drbg, NULL, coreref, pr); + + return 0; } static void drbg_kcapi_cleanup(struct crypto_tfm *tfm) @@ -1665,10 +1674,9 @@ static int drbg_kcapi_random(struct crypto_rng *tfm, u8 *rdata, } /* - * Reset the DRBG invoked by the kernel crypto API - * The reset implies a full re-initialization of the DRBG. Similar to the - * generate function of drbg_kcapi_random, this function extends the - * kernel crypto API interface with struct drbg_gen + * Seed the DRBG invoked by the kernel crypto API + * Similar to the generate function of drbg_kcapi_random, this + * function extends the kernel crypto API interface with struct drbg_gen */ static int drbg_kcapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen) { @@ -1678,7 +1686,6 @@ static int drbg_kcapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen) struct drbg_string seed_string; int coreref = 0; - drbg_uninstantiate(drbg); drbg_convert_tfm_core(crypto_tfm_alg_driver_name(tfm_base), &coreref, &pr); if (0 < slen) { |
