fpu.c 4.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164
  1. /*
  2. * FPU: Wrapper for blkcipher touching fpu
  3. *
  4. * Copyright (c) Intel Corp.
  5. * Author: Huang Ying <ying.huang@intel.com>
  6. *
  7. * This program is free software; you can redistribute it and/or modify it
  8. * under the terms of the GNU General Public License as published by the Free
  9. * Software Foundation; either version 2 of the License, or (at your option)
  10. * any later version.
  11. *
  12. */
  13. #include <crypto/algapi.h>
  14. #include <linux/err.h>
  15. #include <linux/init.h>
  16. #include <linux/kernel.h>
  17. #include <linux/module.h>
  18. #include <linux/slab.h>
  19. #include <linux/crypto.h>
  20. #include <asm/fpu/api.h>
  21. struct crypto_fpu_ctx {
  22. struct crypto_blkcipher *child;
  23. };
  24. static int crypto_fpu_setkey(struct crypto_tfm *parent, const u8 *key,
  25. unsigned int keylen)
  26. {
  27. struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(parent);
  28. struct crypto_blkcipher *child = ctx->child;
  29. int err;
  30. crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
  31. crypto_blkcipher_set_flags(child, crypto_tfm_get_flags(parent) &
  32. CRYPTO_TFM_REQ_MASK);
  33. err = crypto_blkcipher_setkey(child, key, keylen);
  34. crypto_tfm_set_flags(parent, crypto_blkcipher_get_flags(child) &
  35. CRYPTO_TFM_RES_MASK);
  36. return err;
  37. }
  38. static int crypto_fpu_encrypt(struct blkcipher_desc *desc_in,
  39. struct scatterlist *dst, struct scatterlist *src,
  40. unsigned int nbytes)
  41. {
  42. int err;
  43. struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
  44. struct crypto_blkcipher *child = ctx->child;
  45. struct blkcipher_desc desc = {
  46. .tfm = child,
  47. .info = desc_in->info,
  48. .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
  49. };
  50. kernel_fpu_begin();
  51. err = crypto_blkcipher_crt(desc.tfm)->encrypt(&desc, dst, src, nbytes);
  52. kernel_fpu_end();
  53. return err;
  54. }
  55. static int crypto_fpu_decrypt(struct blkcipher_desc *desc_in,
  56. struct scatterlist *dst, struct scatterlist *src,
  57. unsigned int nbytes)
  58. {
  59. int err;
  60. struct crypto_fpu_ctx *ctx = crypto_blkcipher_ctx(desc_in->tfm);
  61. struct crypto_blkcipher *child = ctx->child;
  62. struct blkcipher_desc desc = {
  63. .tfm = child,
  64. .info = desc_in->info,
  65. .flags = desc_in->flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
  66. };
  67. kernel_fpu_begin();
  68. err = crypto_blkcipher_crt(desc.tfm)->decrypt(&desc, dst, src, nbytes);
  69. kernel_fpu_end();
  70. return err;
  71. }
  72. static int crypto_fpu_init_tfm(struct crypto_tfm *tfm)
  73. {
  74. struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
  75. struct crypto_spawn *spawn = crypto_instance_ctx(inst);
  76. struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
  77. struct crypto_blkcipher *cipher;
  78. cipher = crypto_spawn_blkcipher(spawn);
  79. if (IS_ERR(cipher))
  80. return PTR_ERR(cipher);
  81. ctx->child = cipher;
  82. return 0;
  83. }
  84. static void crypto_fpu_exit_tfm(struct crypto_tfm *tfm)
  85. {
  86. struct crypto_fpu_ctx *ctx = crypto_tfm_ctx(tfm);
  87. crypto_free_blkcipher(ctx->child);
  88. }
  89. static struct crypto_instance *crypto_fpu_alloc(struct rtattr **tb)
  90. {
  91. struct crypto_instance *inst;
  92. struct crypto_alg *alg;
  93. int err;
  94. err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
  95. if (err)
  96. return ERR_PTR(err);
  97. alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER,
  98. CRYPTO_ALG_TYPE_MASK);
  99. if (IS_ERR(alg))
  100. return ERR_CAST(alg);
  101. inst = crypto_alloc_instance("fpu", alg);
  102. if (IS_ERR(inst))
  103. goto out_put_alg;
  104. inst->alg.cra_flags = alg->cra_flags;
  105. inst->alg.cra_priority = alg->cra_priority;
  106. inst->alg.cra_blocksize = alg->cra_blocksize;
  107. inst->alg.cra_alignmask = alg->cra_alignmask;
  108. inst->alg.cra_type = alg->cra_type;
  109. inst->alg.cra_blkcipher.ivsize = alg->cra_blkcipher.ivsize;
  110. inst->alg.cra_blkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
  111. inst->alg.cra_blkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
  112. inst->alg.cra_ctxsize = sizeof(struct crypto_fpu_ctx);
  113. inst->alg.cra_init = crypto_fpu_init_tfm;
  114. inst->alg.cra_exit = crypto_fpu_exit_tfm;
  115. inst->alg.cra_blkcipher.setkey = crypto_fpu_setkey;
  116. inst->alg.cra_blkcipher.encrypt = crypto_fpu_encrypt;
  117. inst->alg.cra_blkcipher.decrypt = crypto_fpu_decrypt;
  118. out_put_alg:
  119. crypto_mod_put(alg);
  120. return inst;
  121. }
  122. static void crypto_fpu_free(struct crypto_instance *inst)
  123. {
  124. crypto_drop_spawn(crypto_instance_ctx(inst));
  125. kfree(inst);
  126. }
  127. static struct crypto_template crypto_fpu_tmpl = {
  128. .name = "fpu",
  129. .alloc = crypto_fpu_alloc,
  130. .free = crypto_fpu_free,
  131. .module = THIS_MODULE,
  132. };
  133. int __init crypto_fpu_init(void)
  134. {
  135. return crypto_register_template(&crypto_fpu_tmpl);
  136. }
  137. void crypto_fpu_exit(void)
  138. {
  139. crypto_unregister_template(&crypto_fpu_tmpl);
  140. }
  141. MODULE_ALIAS_CRYPTO("fpu");