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crypto: skcipher - Use RNG interface instead of get_random_bytes

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This patch makes the IV generators use the new RNG interface so
that the user can pick an RNG other than the default get_random_bytes.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2008-08-14 22:21:31 +10:00
parent 17f0f4a47d
commit a0f000ec9b
4 changed files with 75 additions and 13 deletions
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27
crypto/seqiv.c
View File

@@ -15,11 +15,11 @@
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/rng.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/spinlock.h>
#include <linux/string.h>
@@ -189,17 +189,22 @@ static int seqiv_givencrypt_first(struct skcipher_givcrypt_request *req)
{
struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
int err = 0;
spin_lock_bh(&ctx->lock);
if (crypto_ablkcipher_crt(geniv)->givencrypt != seqiv_givencrypt_first)
goto unlock;
crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt;
get_random_bytes(ctx->salt, crypto_ablkcipher_ivsize(geniv));
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_ablkcipher_ivsize(geniv));
unlock:
spin_unlock_bh(&ctx->lock);
if (err)
return err;
return seqiv_givencrypt(req);
}
@@ -207,17 +212,22 @@ static int seqiv_aead_givencrypt_first(struct aead_givcrypt_request *req)
{
struct crypto_aead *geniv = aead_givcrypt_reqtfm(req);
struct seqiv_ctx *ctx = crypto_aead_ctx(geniv);
int err = 0;
spin_lock_bh(&ctx->lock);
if (crypto_aead_crt(geniv)->givencrypt != seqiv_aead_givencrypt_first)
goto unlock;
crypto_aead_crt(geniv)->givencrypt = seqiv_aead_givencrypt;
get_random_bytes(ctx->salt, crypto_aead_ivsize(geniv));
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_aead_ivsize(geniv));
unlock:
spin_unlock_bh(&ctx->lock);
if (err)
return err;
return seqiv_aead_givencrypt(req);
}
@@ -298,19 +308,27 @@ static struct crypto_instance *seqiv_alloc(struct rtattr **tb)
if (IS_ERR(algt))
return ERR_PTR(err);
err = crypto_get_default_rng();
if (err)
return ERR_PTR(err);
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
inst = seqiv_ablkcipher_alloc(tb);
else
inst = seqiv_aead_alloc(tb);
if (IS_ERR(inst))
goto out;
goto put_rng;
inst->alg.cra_alignmask |= __alignof__(u32) - 1;
inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx);
out:
return inst;
put_rng:
crypto_put_default_rng();
goto out;
}
static void seqiv_free(struct crypto_instance *inst)
@@ -319,6 +337,7 @@ static void seqiv_free(struct crypto_instance *inst)
skcipher_geniv_free(inst);
else
aead_geniv_free(inst);
crypto_put_default_rng();
}
static struct crypto_template seqiv_tmpl = {