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102 lines
3.5 KiB
102 lines
3.5 KiB
From 584201f1895d915c1aa523bc86afdc126e94beca Mon Sep 17 00:00:00 2001
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From: Christian Lamparter <chunkeey@gmail.com>
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Date: Thu, 19 Apr 2018 18:41:56 +0200
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Subject: [PATCH 7/8] crypto: crypto4xx - extend aead fallback checks
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1020 bytes is the limit for associated data. Any more
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and it will no longer fit into hash_crypto_offset anymore.
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The hardware will not process aead requests with plaintext
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that have less than AES_BLOCK_SIZE bytes. When decrypting
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aead requests the authsize has to be taken in account as
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well, as it is part of the cryptlen. Otherwise the hardware
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will think it has been misconfigured and will return:
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aead return err status = 0x98
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For rtc4543(gcm(aes)), the hardware has a dedicated GMAC
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mode as part of the hash function set.
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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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---
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drivers/crypto/amcc/crypto4xx_alg.c | 30 +++++++++++++++--------------
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1 file changed, 16 insertions(+), 14 deletions(-)
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--- a/drivers/crypto/amcc/crypto4xx_alg.c
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+++ b/drivers/crypto/amcc/crypto4xx_alg.c
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@@ -321,6 +321,7 @@ int crypto4xx_decrypt_ctr(struct skciphe
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}
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static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
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+ unsigned int len,
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bool is_ccm, bool decrypt)
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{
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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@@ -330,14 +331,14 @@ static inline bool crypto4xx_aead_need_f
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return true;
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/*
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- * hardware does not handle cases where cryptlen
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- * is less than a block
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+ * hardware does not handle cases where plaintext
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+ * is less than a block.
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*/
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- if (req->cryptlen < AES_BLOCK_SIZE)
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+ if (len < AES_BLOCK_SIZE)
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return true;
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- /* assoc len needs to be a multiple of 4 */
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- if (req->assoclen & 0x3)
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+ /* assoc len needs to be a multiple of 4 and <= 1020 */
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+ if (req->assoclen & 0x3 || req->assoclen > 1020)
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return true;
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/* CCM supports only counter field length of 2 and 4 bytes */
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@@ -449,17 +450,17 @@ static int crypto4xx_crypt_aes_ccm(struc
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{
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struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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- unsigned int len = req->cryptlen;
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__le32 iv[16];
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u32 tmp_sa[SA_AES128_CCM_LEN + 4];
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struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
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-
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- if (crypto4xx_aead_need_fallback(req, true, decrypt))
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- return crypto4xx_aead_fallback(req, ctx, decrypt);
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+ unsigned int len = req->cryptlen;
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if (decrypt)
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len -= crypto_aead_authsize(aead);
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+ if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
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+ return crypto4xx_aead_fallback(req, ctx, decrypt);
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+
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memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
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sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
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@@ -605,18 +606,19 @@ static inline int crypto4xx_crypt_aes_gc
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bool decrypt)
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{
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struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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- unsigned int len = req->cryptlen;
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+ struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
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__le32 iv[4];
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+ unsigned int len = req->cryptlen;
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+
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+ if (decrypt)
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+ len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
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- if (crypto4xx_aead_need_fallback(req, false, decrypt))
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+ if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
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return crypto4xx_aead_fallback(req, ctx, decrypt);
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crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
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iv[3] = cpu_to_le32(1);
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- if (decrypt)
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- len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
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-
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return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
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len, iv, sizeof(iv),
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decrypt ? ctx->sa_in : ctx->sa_out,
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