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| author | David S. Miller <davem@davemloft.net> | 2012-12-19 15:20:23 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-12-19 15:20:23 -0800 |
| commit | a8d97cef2168ffe5af1aeed6bf6cdc3ce53f3d0b (patch) | |
| tree | 0f5e90df34046af96bf7cc3ef500b9f51a65fcc2 /arch | |
| parent | 9f28ffc03e93343ac04874fda9edb7affea45165 (diff) | |
| download | lwn-a8d97cef2168ffe5af1aeed6bf6cdc3ce53f3d0b.tar.gz lwn-a8d97cef2168ffe5af1aeed6bf6cdc3ce53f3d0b.zip | |
sparc64: Fix AES ctr mode block size.
Like the generic versions, we need to support a block size
of '1' for CTR mode AES.
This was discovered thanks to all of the new test cases added by
Jussi Kivilinna.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/crypto/aes_glue.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/arch/sparc/crypto/aes_glue.c b/arch/sparc/crypto/aes_glue.c index 3965d1d36dfa..d26e75126fb5 100644 --- a/arch/sparc/crypto/aes_glue.c +++ b/arch/sparc/crypto/aes_glue.c @@ -329,6 +329,22 @@ static int cbc_decrypt(struct blkcipher_desc *desc, return err; } +static void ctr_crypt_final(struct crypto_sparc64_aes_ctx *ctx, + struct blkcipher_walk *walk) +{ + u8 *ctrblk = walk->iv; + u64 keystream[AES_BLOCK_SIZE / sizeof(u64)]; + u8 *src = walk->src.virt.addr; + u8 *dst = walk->dst.virt.addr; + unsigned int nbytes = walk->nbytes; + + ctx->ops->ecb_encrypt(&ctx->key[0], (const u64 *)ctrblk, + keystream, AES_BLOCK_SIZE); + crypto_xor((u8 *) keystream, src, nbytes); + memcpy(dst, keystream, nbytes); + crypto_inc(ctrblk, AES_BLOCK_SIZE); +} + static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) @@ -338,10 +354,11 @@ static int ctr_crypt(struct blkcipher_desc *desc, int err; blkcipher_walk_init(&walk, dst, src, nbytes); - err = blkcipher_walk_virt(desc, &walk); + err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE); + desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; ctx->ops->load_encrypt_keys(&ctx->key[0]); - while ((nbytes = walk.nbytes)) { + while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) { unsigned int block_len = nbytes & AES_BLOCK_MASK; if (likely(block_len)) { @@ -353,6 +370,10 @@ static int ctr_crypt(struct blkcipher_desc *desc, nbytes &= AES_BLOCK_SIZE - 1; err = blkcipher_walk_done(desc, &walk, nbytes); } + if (walk.nbytes) { + ctr_crypt_final(ctx, &walk); + err = blkcipher_walk_done(desc, &walk, 0); + } fprs_write(0); return err; } @@ -418,7 +439,7 @@ static struct crypto_alg algs[] = { { .cra_driver_name = "ctr-aes-sparc64", .cra_priority = SPARC_CR_OPCODE_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, - .cra_blocksize = AES_BLOCK_SIZE, + .cra_blocksize = 1, .cra_ctxsize = sizeof(struct crypto_sparc64_aes_ctx), .cra_alignmask = 7, .cra_type = &crypto_blkcipher_type, |