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| author | Mathias Krause <mathias.krause@secunet.com> | 2013-10-15 13:49:33 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2013-10-16 20:56:26 +0800 |
| commit | ab827fb399b453bd7d4a49e8878bc5f7018507dd (patch) | |
| tree | cdf0a38b277196463213ef5097d25ebd95fa882e /drivers/crypto/picoxcell_crypto.c | |
| parent | 56902781cd037f4d6380cb037b5f50076bb82549 (diff) | |
| download | linux-ab827fb399b453bd7d4a49e8878bc5f7018507dd.tar.gz linux-ab827fb399b453bd7d4a49e8878bc5f7018507dd.tar.bz2 linux-ab827fb399b453bd7d4a49e8878bc5f7018507dd.zip | |
crypto: picoxcell - Simplify and harden key parsing
Use the common helper function crypto_authenc_extractkeys() for key
parsing. Also ensure the auth key won't overflow the hash_ctx buffer.
Cc: Jamie Iles <jamie@jamieiles.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Mathias Krause <mathias.krause@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/picoxcell_crypto.c')
| -rw-r--r-- | drivers/crypto/picoxcell_crypto.c | 32 |
1 files changed, 8 insertions, 24 deletions
diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c index 888f7f4a6d3f..a6175ba6d238 100644 --- a/drivers/crypto/picoxcell_crypto.c +++ b/drivers/crypto/picoxcell_crypto.c @@ -495,45 +495,29 @@ static int spacc_aead_setkey(struct crypto_aead *tfm, const u8 *key, { struct spacc_aead_ctx *ctx = crypto_aead_ctx(tfm); struct spacc_alg *alg = to_spacc_alg(tfm->base.__crt_alg); - struct rtattr *rta = (void *)key; - struct crypto_authenc_key_param *param; - unsigned int authkeylen, enckeylen; + struct crypto_authenc_keys keys; int err = -EINVAL; - if (!RTA_OK(rta, keylen)) + if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) goto badkey; - if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) + if (keys.enckeylen > AES_MAX_KEY_SIZE) goto badkey; - if (RTA_PAYLOAD(rta) < sizeof(*param)) - goto badkey; - - param = RTA_DATA(rta); - enckeylen = be32_to_cpu(param->enckeylen); - - key += RTA_ALIGN(rta->rta_len); - keylen -= RTA_ALIGN(rta->rta_len); - - if (keylen < enckeylen) - goto badkey; - - authkeylen = keylen - enckeylen; - - if (enckeylen > AES_MAX_KEY_SIZE) + if (keys.authkeylen > sizeof(ctx->hash_ctx)) goto badkey; if ((alg->ctrl_default & SPACC_CRYPTO_ALG_MASK) == SPA_CTRL_CIPH_ALG_AES) - err = spacc_aead_aes_setkey(tfm, key + authkeylen, enckeylen); + err = spacc_aead_aes_setkey(tfm, keys.enckey, keys.enckeylen); else - err = spacc_aead_des_setkey(tfm, key + authkeylen, enckeylen); + err = spacc_aead_des_setkey(tfm, keys.enckey, keys.enckeylen); if (err) goto badkey; - memcpy(ctx->hash_ctx, key, authkeylen); - ctx->hash_key_len = authkeylen; + memcpy(ctx->hash_ctx, keys.authkey, keys.authkeylen); + ctx->hash_key_len = keys.authkeylen; return 0; |