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說明: 在無特別的說明下，本文講述得都是armv8-aarch64體系、linux kernel 4.14 arm64軟件環境！

文章目錄

• • • • 1、定義一個算法
      • 2、注冊crypto算法
      • 3、crypto算法的查找
      • 4、算法調用的示例

1、定義一個算法

Linux Kernel中crypto算法的定義是以crypto_alg結構體來實現的

{.cra_name = "__ecb-aes-" MODE,.cra_driver_name = "__driver-ecb-aes-" MODE,.cra_priority = 0,.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |CRYPTO_ALG_INTERNAL,.cra_blocksize = AES_BLOCK_SIZE,.cra_ctxsize = sizeof(struct crypto_aes_ctx),.cra_alignmask = 7,.cra_type = &crypto_blkcipher_type,.cra_module = THIS_MODULE,.cra_blkcipher = {.min_keysize = AES_MIN_KEY_SIZE,.max_keysize = AES_MAX_KEY_SIZE,.ivsize = 0,.setkey = aes_setkey,.encrypt = ecb_encrypt,.decrypt = ecb_decrypt,},

2、注冊crypto算法

注冊一個算法(algapi.c)，crypto_alg_list鏈表維護著一些列crypto_alg結構體

int crypto_register_alg(struct crypto_alg *alg) {struct crypto_larval *larval;int err;alg->cra_flags &= ~CRYPTO_ALG_DEAD;err = crypto_check_alg(alg);if (err)return err;down_write(&crypto_alg_sem);larval = __crypto_register_alg(alg);up_write(&crypto_alg_sem);if (IS_ERR(larval))return PTR_ERR(larval);crypto_wait_for_test(larval);return 0; } EXPORT_SYMBOL_GPL(crypto_register_alg);

3、crypto算法的查找

根據名字查詢一個算法(api.c)，返回crypto_alg

struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask) {struct crypto_alg *alg;down_read(&crypto_alg_sem);alg = __crypto_alg_lookup(name, type, mask);up_read(&crypto_alg_sem);return alg; } EXPORT_SYMBOL_GPL(crypto_alg_lookup);

4、算法調用的示例

（以tcrypt為例）
而在tcrypt.c的測試模塊中，可根據名字，直接調用crypto_alg接口模塊

test_cipher_speed("ecb(aes)", ENCRYPT, sec, NULL, 0,speed_template_16_24_32);test_cipher_speed("ecb(aes)", DECRYPT, sec, NULL, 0,speed_template_16_24_32);test_cipher_speed("cbc(aes)", ENCRYPT, sec, NULL, 0,speed_template_16_24_32);test_cipher_speed("cbc(aes)", DECRYPT, sec, NULL, 0,speed_template_16_24_32);test_cipher_speed("lrw(aes)", ENCRYPT, sec, NULL, 0,speed_template_32_40_48);test_cipher_speed("lrw(aes)", DECRYPT, sec, NULL, 0,speed_template_32_40_48);test_cipher_speed("xts(aes)", ENCRYPT, sec, NULL, 0,speed_template_32_48_64);test_cipher_speed("xts(aes)", DECRYPT, sec, NULL, 0,speed_template_32_48_64);test_cipher_speed("ctr(aes)", ENCRYPT, sec, NULL, 0,speed_template_16_24_32);test_cipher_speed("ctr(aes)", DECRYPT, sec, NULL, 0,speed_template_16_24_32);

總結

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