@@ -19,6 +19,8 @@
#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <crypto/xts.h>
+#include <crypto/gf128mul.h>
+#include <crypto/scatterwalk.h>
/*
* MAX_BYTES defines the number of bytes that are allowed to be processed
@@ -327,12 +329,87 @@ static int ppc_xts_crypt(struct skcipher_request *req, bool enc)
static int ppc_xts_encrypt(struct skcipher_request *req)
{
- return ppc_xts_crypt(req, true);
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct ppc_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+ int tail = req->cryptlen % AES_BLOCK_SIZE;
+ int offset = req->cryptlen - tail - AES_BLOCK_SIZE;
+ struct skcipher_request subreq;
+ u8 b[2][AES_BLOCK_SIZE];
+ int err;
+
+ if (req->cryptlen < AES_BLOCK_SIZE)
+ return -EINVAL;
+
+ if (tail) {
+ subreq = *req;
+ skcipher_request_set_crypt(&subreq, req->src, req->dst,
+ req->cryptlen - tail, req->iv);
+ req = &subreq;
+ }
+
+ err = ppc_xts_crypt(req, true);
+ if (err || !tail)
+ return err;
+
+ scatterwalk_map_and_copy(b[0], req->dst, offset, AES_BLOCK_SIZE, 0);
+ memcpy(b[1], b[0], tail);
+ scatterwalk_map_and_copy(b[0], req->src, offset + AES_BLOCK_SIZE, tail, 0);
+
+ spe_begin();
+ ppc_encrypt_xts(b[0], b[0], ctx->key_enc, ctx->rounds, AES_BLOCK_SIZE,
+ req->iv, NULL);
+ spe_end();
+
+ scatterwalk_map_and_copy(b[0], req->dst, offset, AES_BLOCK_SIZE + tail, 1);
+
+ return 0;
}
static int ppc_xts_decrypt(struct skcipher_request *req)
{
- return ppc_xts_crypt(req, false);
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct ppc_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+ int tail = req->cryptlen % AES_BLOCK_SIZE;
+ int offset = req->cryptlen - tail - AES_BLOCK_SIZE;
+ struct skcipher_request subreq;
+ u8 b[3][AES_BLOCK_SIZE];
+ le128 twk;
+ int err;
+
+ if (req->cryptlen < AES_BLOCK_SIZE)
+ return -EINVAL;
+
+ if (tail) {
+ subreq = *req;
+ skcipher_request_set_crypt(&subreq, req->src, req->dst,
+ offset, req->iv);
+ req = &subreq;
+ }
+
+ err = ppc_xts_crypt(req, false);
+ if (err || !tail)
+ return err;
+
+ scatterwalk_map_and_copy(b[1], req->src, offset, AES_BLOCK_SIZE + tail, 0);
+
+ spe_begin();
+ if (!offset)
+ ppc_encrypt_ecb(req->iv, req->iv, ctx->key_twk, ctx->rounds,
+ AES_BLOCK_SIZE);
+
+ gf128mul_x_ble(&twk, (le128 *)req->iv);
+
+ ppc_decrypt_xts(b[1], b[1], ctx->key_dec, ctx->rounds, AES_BLOCK_SIZE,
+ (u8 *)&twk, NULL);
+ memcpy(b[0], b[2], tail);
+ memcpy(b[0] + tail, b[1] + tail, AES_BLOCK_SIZE - tail);
+ ppc_decrypt_xts(b[0], b[0], ctx->key_dec, ctx->rounds, AES_BLOCK_SIZE,
+ req->iv, NULL);
+ spe_end();
+
+ scatterwalk_map_and_copy(b[0], req->dst, offset, AES_BLOCK_SIZE + tail, 1);
+
+ return 0;
}
/*
Add the logic to deal with input sizes that are not a round multiple of the AES block size, as described by the XTS spec. This brings the SPE implementation in line with other kernel drivers that have been updated recently to take this into account. Cc: Eric Biggers <ebiggers@google.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- This applies onto Eric's series 'crypto: powerpc - convert SPE AES algorithms to skcipher API', which helpfully contained instructions how to run this code under QEMU, allowing me to test the changes below. arch/powerpc/crypto/aes-spe-glue.c | 81 +++++++++++++++++++- 1 file changed, 79 insertions(+), 2 deletions(-)