329 lines
8.8 KiB
C
329 lines
8.8 KiB
C
/* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes.
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*
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* Copyright (C) 2012 David S. Miller <davem@davemloft.net>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/crypto.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <crypto/algapi.h>
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#include <asm/fpumacro.h>
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#include <asm/pstate.h>
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#include <asm/elf.h>
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#include "opcodes.h"
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#define CAMELLIA_MIN_KEY_SIZE 16
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#define CAMELLIA_MAX_KEY_SIZE 32
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#define CAMELLIA_BLOCK_SIZE 16
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#define CAMELLIA_TABLE_BYTE_LEN 272
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struct camellia_sparc64_ctx {
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u64 encrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
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u64 decrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
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int key_len;
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};
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extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key,
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unsigned int key_len, u64 *decrypt_key);
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static int camellia_set_key(struct crypto_tfm *tfm, const u8 *_in_key,
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unsigned int key_len)
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{
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struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
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const u32 *in_key = (const u32 *) _in_key;
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u32 *flags = &tfm->crt_flags;
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if (key_len != 16 && key_len != 24 && key_len != 32) {
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*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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ctx->key_len = key_len;
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camellia_sparc64_key_expand(in_key, &ctx->encrypt_key[0],
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key_len, &ctx->decrypt_key[0]);
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return 0;
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}
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extern void camellia_sparc64_crypt(const u64 *key, const u32 *input,
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u32 *output, unsigned int key_len);
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static void camellia_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
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camellia_sparc64_crypt(&ctx->encrypt_key[0],
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(const u32 *) src,
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(u32 *) dst, ctx->key_len);
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}
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static void camellia_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
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camellia_sparc64_crypt(&ctx->decrypt_key[0],
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(const u32 *) src,
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(u32 *) dst, ctx->key_len);
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}
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extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len);
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typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len,
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const u64 *key);
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extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds;
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extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds;
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#define CAMELLIA_BLOCK_MASK (~(CAMELLIA_BLOCK_SIZE - 1))
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static int __ecb_crypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes, bool encrypt)
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{
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struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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ecb_crypt_op *op;
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const u64 *key;
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int err;
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op = camellia_sparc64_ecb_crypt_3_grand_rounds;
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if (ctx->key_len != 16)
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op = camellia_sparc64_ecb_crypt_4_grand_rounds;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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if (encrypt)
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key = &ctx->encrypt_key[0];
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else
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key = &ctx->decrypt_key[0];
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camellia_sparc64_load_keys(key, ctx->key_len);
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while ((nbytes = walk.nbytes)) {
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unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
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if (likely(block_len)) {
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const u64 *src64;
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u64 *dst64;
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src64 = (const u64 *)walk.src.virt.addr;
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dst64 = (u64 *) walk.dst.virt.addr;
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op(src64, dst64, block_len, key);
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}
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nbytes &= CAMELLIA_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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fprs_write(0);
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return err;
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}
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static int ecb_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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return __ecb_crypt(desc, dst, src, nbytes, true);
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}
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static int ecb_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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return __ecb_crypt(desc, dst, src, nbytes, false);
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}
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typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
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const u64 *key, u64 *iv);
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extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
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extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
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extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
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extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
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static int cbc_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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cbc_crypt_op *op;
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const u64 *key;
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int err;
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op = camellia_sparc64_cbc_encrypt_3_grand_rounds;
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if (ctx->key_len != 16)
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op = camellia_sparc64_cbc_encrypt_4_grand_rounds;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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key = &ctx->encrypt_key[0];
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camellia_sparc64_load_keys(key, ctx->key_len);
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while ((nbytes = walk.nbytes)) {
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unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
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if (likely(block_len)) {
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const u64 *src64;
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u64 *dst64;
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src64 = (const u64 *)walk.src.virt.addr;
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dst64 = (u64 *) walk.dst.virt.addr;
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op(src64, dst64, block_len, key,
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(u64 *) walk.iv);
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}
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nbytes &= CAMELLIA_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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fprs_write(0);
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return err;
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}
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static int cbc_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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cbc_crypt_op *op;
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const u64 *key;
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int err;
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op = camellia_sparc64_cbc_decrypt_3_grand_rounds;
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if (ctx->key_len != 16)
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op = camellia_sparc64_cbc_decrypt_4_grand_rounds;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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key = &ctx->decrypt_key[0];
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camellia_sparc64_load_keys(key, ctx->key_len);
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while ((nbytes = walk.nbytes)) {
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unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
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if (likely(block_len)) {
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const u64 *src64;
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u64 *dst64;
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src64 = (const u64 *)walk.src.virt.addr;
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dst64 = (u64 *) walk.dst.virt.addr;
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op(src64, dst64, block_len, key,
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(u64 *) walk.iv);
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}
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nbytes &= CAMELLIA_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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fprs_write(0);
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return err;
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}
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static struct crypto_alg algs[] = { {
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.cra_name = "camellia",
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.cra_driver_name = "camellia-sparc64",
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.cra_priority = SPARC_CR_OPCODE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = CAMELLIA_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct camellia_sparc64_ctx),
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.cra_alignmask = 3,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = CAMELLIA_MIN_KEY_SIZE,
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.cia_max_keysize = CAMELLIA_MAX_KEY_SIZE,
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.cia_setkey = camellia_set_key,
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.cia_encrypt = camellia_encrypt,
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.cia_decrypt = camellia_decrypt
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}
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}
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}, {
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.cra_name = "ecb(camellia)",
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.cra_driver_name = "ecb-camellia-sparc64",
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.cra_priority = SPARC_CR_OPCODE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = CAMELLIA_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct camellia_sparc64_ctx),
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.cra_alignmask = 7,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = CAMELLIA_MIN_KEY_SIZE,
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.max_keysize = CAMELLIA_MAX_KEY_SIZE,
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.setkey = camellia_set_key,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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},
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},
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}, {
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.cra_name = "cbc(camellia)",
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.cra_driver_name = "cbc-camellia-sparc64",
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.cra_priority = SPARC_CR_OPCODE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = CAMELLIA_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct camellia_sparc64_ctx),
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.cra_alignmask = 7,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = CAMELLIA_MIN_KEY_SIZE,
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.max_keysize = CAMELLIA_MAX_KEY_SIZE,
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.ivsize = CAMELLIA_BLOCK_SIZE,
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.setkey = camellia_set_key,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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},
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}
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};
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static bool __init sparc64_has_camellia_opcode(void)
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{
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unsigned long cfr;
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if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
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return false;
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__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
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if (!(cfr & CFR_CAMELLIA))
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return false;
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return true;
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}
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static int __init camellia_sparc64_mod_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(algs); i++)
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INIT_LIST_HEAD(&algs[i].cra_list);
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if (sparc64_has_camellia_opcode()) {
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pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n");
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return crypto_register_algs(algs, ARRAY_SIZE(algs));
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}
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pr_info("sparc64 camellia opcodes not available.\n");
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return -ENODEV;
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}
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static void __exit camellia_sparc64_mod_fini(void)
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{
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crypto_unregister_algs(algs, ARRAY_SIZE(algs));
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}
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module_init(camellia_sparc64_mod_init);
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module_exit(camellia_sparc64_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
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MODULE_ALIAS_CRYPTO("camellia");
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#include "crop_devid.c"
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