From 4664312bf5677b4cdc23143f64fdbea4b2d62f05 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Mon, 22 Apr 2019 13:25:58 +0200 Subject: [PATCH] crypto: crypto4xx - fix ctr-aes missing output IV Commit d263383f9188 ("crypto: testmgr - support checking skcipher output IV") caused the crypto4xx driver to produce the following error: | ctr-aes-ppc4xx encryption test failed (wrong output IV) | on test vector 0, cfg="in-place" This patch fixes this by reworking the crypto4xx_setkey_aes() function to: - not save the iv for ECB (as per 18.2.38 CRYP0_SA_CMD_0: "This bit mut be cleared for DES ECB mode or AES ECB mode, when no IV is used.") - instruct the hardware to save the generated IV for all other modes of operations that have IV and then supply it back to the callee in pretty much the same way as we do it for cbc-aes already. - make it clear that the DIR_(IN|OUT)BOUND is the important bit that tells the hardware to encrypt or decrypt the data. (this is cosmetic - but it hopefully prevents me from getting confused again). - don't load any bogus hash when we don't use any hash operation to begin with. Cc: stable@vger.kernel.org Fixes: 30063962c026 ("crypto: crypto4xx - enable AES RFC3686, ECB, CFB and OFB offloads") Signed-off-by: Christian Lamparter Signed-off-by: Herbert Xu --- drivers/crypto/amcc/crypto4xx_alg.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/crypto/amcc/crypto4xx_alg.c b/drivers/crypto/amcc/crypto4xx_alg.c index 4092c2aad8e21..3458c5a085d93 100644 --- a/drivers/crypto/amcc/crypto4xx_alg.c +++ b/drivers/crypto/amcc/crypto4xx_alg.c @@ -141,9 +141,10 @@ static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher, /* Setup SA */ sa = ctx->sa_in; - set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_CBC ? - SA_SAVE_IV : SA_NOT_SAVE_IV), - SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE, + set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_ECB ? + SA_NOT_SAVE_IV : SA_SAVE_IV), + SA_NOT_LOAD_HASH, (cm == CRYPTO_MODE_ECB ? + SA_LOAD_IV_FROM_SA : SA_LOAD_IV_FROM_STATE), SA_NO_HEADER_PROC, SA_HASH_ALG_NULL, SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT, @@ -162,6 +163,11 @@ static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher, memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4); sa = ctx->sa_out; sa->sa_command_0.bf.dir = DIR_OUTBOUND; + /* + * SA_OPCODE_ENCRYPT is the same value as SA_OPCODE_DECRYPT. + * it's the DIR_(IN|OUT)BOUND that matters + */ + sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT; return 0; } -- 2.39.5