diff options
Diffstat (limited to 'arch/x86/crypto/aesni-intel_glue.c')
| -rw-r--r-- | arch/x86/crypto/aesni-intel_glue.c | 220 |
1 files changed, 124 insertions, 96 deletions
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c index 84e3ed49b35d..2116bc2b9507 100644 --- a/arch/x86/crypto/aesni-intel_glue.c +++ b/arch/x86/crypto/aesni-intel_glue.c @@ -33,9 +33,6 @@ #include <crypto/internal/skcipher.h> #include <linux/workqueue.h> #include <linux/spinlock.h> -#ifdef CONFIG_X86_64 -#include <asm/crypto/glue_helper.h> -#endif #define AESNI_ALIGN 16 @@ -632,98 +629,6 @@ static int ctr_crypt(struct skcipher_request *req) return err; } -static int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key, - unsigned int keylen) -{ - struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - int err; - - err = xts_verify_key(tfm, key, keylen); - if (err) - return err; - - keylen /= 2; - - /* first half of xts-key is for crypt */ - err = aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_crypt_ctx, - key, keylen); - if (err) - return err; - - /* second half of xts-key is for tweak */ - return aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_tweak_ctx, - key + keylen, keylen); -} - - -static void aesni_xts_enc(const void *ctx, u8 *dst, const u8 *src, le128 *iv) -{ - glue_xts_crypt_128bit_one(ctx, dst, src, iv, aesni_enc); -} - -static void aesni_xts_dec(const void *ctx, u8 *dst, const u8 *src, le128 *iv) -{ - glue_xts_crypt_128bit_one(ctx, dst, src, iv, aesni_dec); -} - -static void aesni_xts_enc32(const void *ctx, u8 *dst, const u8 *src, le128 *iv) -{ - aesni_xts_encrypt(ctx, dst, src, 32 * AES_BLOCK_SIZE, (u8 *)iv); -} - -static void aesni_xts_dec32(const void *ctx, u8 *dst, const u8 *src, le128 *iv) -{ - aesni_xts_decrypt(ctx, dst, src, 32 * AES_BLOCK_SIZE, (u8 *)iv); -} - -static const struct common_glue_ctx aesni_enc_xts = { - .num_funcs = 2, - .fpu_blocks_limit = 1, - - .funcs = { { - .num_blocks = 32, - .fn_u = { .xts = aesni_xts_enc32 } - }, { - .num_blocks = 1, - .fn_u = { .xts = aesni_xts_enc } - } } -}; - -static const struct common_glue_ctx aesni_dec_xts = { - .num_funcs = 2, - .fpu_blocks_limit = 1, - - .funcs = { { - .num_blocks = 32, - .fn_u = { .xts = aesni_xts_dec32 } - }, { - .num_blocks = 1, - .fn_u = { .xts = aesni_xts_dec } - } } -}; - -static int xts_encrypt(struct skcipher_request *req) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - - return glue_xts_req_128bit(&aesni_enc_xts, req, aesni_enc, - aes_ctx(ctx->raw_tweak_ctx), - aes_ctx(ctx->raw_crypt_ctx), - false); -} - -static int xts_decrypt(struct skcipher_request *req) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); - - return glue_xts_req_128bit(&aesni_dec_xts, req, aesni_enc, - aes_ctx(ctx->raw_tweak_ctx), - aes_ctx(ctx->raw_crypt_ctx), - true); -} - static int rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) { @@ -996,6 +901,128 @@ static int helper_rfc4106_decrypt(struct aead_request *req) } #endif +static int xts_aesni_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); + int err; + + err = xts_verify_key(tfm, key, keylen); + if (err) + return err; + + keylen /= 2; + + /* first half of xts-key is for crypt */ + err = aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_crypt_ctx, + key, keylen); + if (err) + return err; + + /* second half of xts-key is for tweak */ + return aes_set_key_common(crypto_skcipher_tfm(tfm), ctx->raw_tweak_ctx, + key + keylen, keylen); +} + +static int xts_crypt(struct skcipher_request *req, bool encrypt) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct aesni_xts_ctx *ctx = crypto_skcipher_ctx(tfm); + int tail = req->cryptlen % AES_BLOCK_SIZE; + struct skcipher_request subreq; + struct skcipher_walk walk; + int err; + + if (req->cryptlen < AES_BLOCK_SIZE) + return -EINVAL; + + err = skcipher_walk_virt(&walk, req, false); + + if (unlikely(tail > 0 && walk.nbytes < walk.total)) { + int blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; + + skcipher_walk_abort(&walk); + + skcipher_request_set_tfm(&subreq, tfm); + skcipher_request_set_callback(&subreq, + skcipher_request_flags(req), + NULL, NULL); + skcipher_request_set_crypt(&subreq, req->src, req->dst, + blocks * AES_BLOCK_SIZE, req->iv); + req = &subreq; + err = skcipher_walk_virt(&walk, req, false); + } else { + tail = 0; + } + + kernel_fpu_begin(); + + /* calculate first value of T */ + aesni_enc(aes_ctx(ctx->raw_tweak_ctx), walk.iv, walk.iv); + + while (walk.nbytes > 0) { + int nbytes = walk.nbytes; + + if (nbytes < walk.total) + nbytes &= ~(AES_BLOCK_SIZE - 1); + + if (encrypt) + aesni_xts_encrypt(aes_ctx(ctx->raw_crypt_ctx), + walk.dst.virt.addr, walk.src.virt.addr, + nbytes, walk.iv); + else + aesni_xts_decrypt(aes_ctx(ctx->raw_crypt_ctx), + walk.dst.virt.addr, walk.src.virt.addr, + nbytes, walk.iv); + kernel_fpu_end(); + + err = skcipher_walk_done(&walk, walk.nbytes - nbytes); + + if (walk.nbytes > 0) + kernel_fpu_begin(); + } + + if (unlikely(tail > 0 && !err)) { + struct scatterlist sg_src[2], sg_dst[2]; + struct scatterlist *src, *dst; + + dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); + if (req->dst != req->src) + dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); + + skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, + req->iv); + + err = skcipher_walk_virt(&walk, &subreq, false); + if (err) + return err; + + kernel_fpu_begin(); + if (encrypt) + aesni_xts_encrypt(aes_ctx(ctx->raw_crypt_ctx), + walk.dst.virt.addr, walk.src.virt.addr, + walk.nbytes, walk.iv); + else + aesni_xts_decrypt(aes_ctx(ctx->raw_crypt_ctx), + walk.dst.virt.addr, walk.src.virt.addr, + walk.nbytes, walk.iv); + kernel_fpu_end(); + + err = skcipher_walk_done(&walk, 0); + } + return err; +} + +static int xts_encrypt(struct skcipher_request *req) +{ + return xts_crypt(req, true); +} + +static int xts_decrypt(struct skcipher_request *req) +{ + return xts_crypt(req, false); +} + static struct crypto_alg aesni_cipher_alg = { .cra_name = "aes", .cra_driver_name = "aes-aesni", @@ -1082,6 +1109,7 @@ static struct skcipher_alg aesni_skciphers[] = { .setkey = aesni_skcipher_setkey, .encrypt = ctr_crypt, .decrypt = ctr_crypt, +#endif }, { .base = { .cra_name = "__xts(aes)", @@ -1095,10 +1123,10 @@ static struct skcipher_alg aesni_skciphers[] = { .min_keysize = 2 * AES_MIN_KEY_SIZE, .max_keysize = 2 * AES_MAX_KEY_SIZE, .ivsize = AES_BLOCK_SIZE, + .walksize = 2 * AES_BLOCK_SIZE, .setkey = xts_aesni_setkey, .encrypt = xts_encrypt, .decrypt = xts_decrypt, -#endif } }; |