diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/crypto/twofish_glue_3way.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/arch/x86/crypto/twofish_glue_3way.c b/arch/x86/crypto/twofish_glue_3way.c index 5ede9c444c3e..fa9151df3637 100644 --- a/arch/x86/crypto/twofish_glue_3way.c +++ b/arch/x86/crypto/twofish_glue_3way.c @@ -32,6 +32,11 @@ #include <crypto/algapi.h> #include <crypto/twofish.h> #include <crypto/b128ops.h> +#include <crypto/lrw.h> + +#if defined(CONFIG_CRYPTO_LRW) || defined(CONFIG_CRYPTO_LRW_MODULE) +#define HAS_LRW +#endif /* regular block cipher functions from twofish_x86_64 module */ asmlinkage void twofish_enc_blk(struct twofish_ctx *ctx, u8 *dst, @@ -432,6 +437,124 @@ static struct crypto_alg blk_ctr_alg = { }, }; +#ifdef HAS_LRW + +static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) +{ + const unsigned int bsize = TF_BLOCK_SIZE; + struct twofish_ctx *ctx = priv; + int i; + + if (nbytes == 3 * bsize) { + twofish_enc_blk_3way(ctx, srcdst, srcdst); + return; + } + + for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) + twofish_enc_blk(ctx, srcdst, srcdst); +} + +static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) +{ + const unsigned int bsize = TF_BLOCK_SIZE; + struct twofish_ctx *ctx = priv; + int i; + + if (nbytes == 3 * bsize) { + twofish_dec_blk_3way(ctx, srcdst, srcdst); + return; + } + + for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) + twofish_dec_blk(ctx, srcdst, srcdst); +} + +struct twofish_lrw_ctx { + struct lrw_table_ctx lrw_table; + struct twofish_ctx twofish_ctx; +}; + +static int lrw_twofish_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int keylen) +{ + struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm); + int err; + + err = __twofish_setkey(&ctx->twofish_ctx, key, keylen - TF_BLOCK_SIZE, + &tfm->crt_flags); + if (err) + return err; + + return lrw_init_table(&ctx->lrw_table, key + keylen - TF_BLOCK_SIZE); +} + +static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + be128 buf[3]; + struct lrw_crypt_req req = { + .tbuf = buf, + .tbuflen = sizeof(buf), + + .table_ctx = &ctx->lrw_table, + .crypt_ctx = &ctx->twofish_ctx, + .crypt_fn = encrypt_callback, + }; + + return lrw_crypt(desc, dst, src, nbytes, &req); +} + +static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes) +{ + struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); + be128 buf[3]; + struct lrw_crypt_req req = { + .tbuf = buf, + .tbuflen = sizeof(buf), + + .table_ctx = &ctx->lrw_table, + .crypt_ctx = &ctx->twofish_ctx, + .crypt_fn = decrypt_callback, + }; + + return lrw_crypt(desc, dst, src, nbytes, &req); +} + +static void lrw_exit_tfm(struct crypto_tfm *tfm) +{ + struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm); + + lrw_free_table(&ctx->lrw_table); +} + +static struct crypto_alg blk_lrw_alg = { + .cra_name = "lrw(twofish)", + .cra_driver_name = "lrw-twofish-3way", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = TF_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct twofish_lrw_ctx), + .cra_alignmask = 0, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(blk_lrw_alg.cra_list), + .cra_exit = lrw_exit_tfm, + .cra_u = { + .blkcipher = { + .min_keysize = TF_MIN_KEY_SIZE + TF_BLOCK_SIZE, + .max_keysize = TF_MAX_KEY_SIZE + TF_BLOCK_SIZE, + .ivsize = TF_BLOCK_SIZE, + .setkey = lrw_twofish_setkey, + .encrypt = lrw_encrypt, + .decrypt = lrw_decrypt, + }, + }, +}; + +#endif + int __init init(void) { int err; @@ -445,9 +568,18 @@ int __init init(void) err = crypto_register_alg(&blk_ctr_alg); if (err) goto ctr_err; +#ifdef HAS_LRW + err = crypto_register_alg(&blk_lrw_alg); + if (err) + goto blk_lrw_err; +#endif return 0; +#ifdef HAS_LRW +blk_lrw_err: + crypto_unregister_alg(&blk_ctr_alg); +#endif ctr_err: crypto_unregister_alg(&blk_cbc_alg); cbc_err: @@ -458,6 +590,9 @@ ecb_err: void __exit fini(void) { +#ifdef HAS_LRW + crypto_unregister_alg(&blk_lrw_alg); +#endif crypto_unregister_alg(&blk_ctr_alg); crypto_unregister_alg(&blk_cbc_alg); crypto_unregister_alg(&blk_ecb_alg); |