Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * ECB: Electronic CodeBook mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <crypto/algapi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <crypto/internal/cipher.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <crypto/internal/skcipher.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) static int crypto_ecb_crypt(struct skcipher_request *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 			    struct crypto_cipher *cipher,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 			    void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	const unsigned int bsize = crypto_cipher_blocksize(cipher);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	struct skcipher_walk walk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	unsigned int nbytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	err = skcipher_walk_virt(&walk, req, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	while ((nbytes = walk.nbytes) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		const u8 *src = walk.src.virt.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		u8 *dst = walk.dst.virt.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 			fn(crypto_cipher_tfm(cipher), dst, src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 			src += bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			dst += bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		} while ((nbytes -= bsize) >= bsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		err = skcipher_walk_done(&walk, nbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static int crypto_ecb_encrypt(struct skcipher_request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	return crypto_ecb_crypt(req, cipher,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 				crypto_cipher_alg(cipher)->cia_encrypt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static int crypto_ecb_decrypt(struct skcipher_request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	return crypto_ecb_crypt(req, cipher,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				crypto_cipher_alg(cipher)->cia_decrypt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	struct skcipher_instance *inst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	inst = skcipher_alloc_instance_simple(tmpl, tb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (IS_ERR(inst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return PTR_ERR(inst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	inst->alg.encrypt = crypto_ecb_encrypt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	inst->alg.decrypt = crypto_ecb_decrypt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	err = skcipher_register_instance(tmpl, inst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		inst->free(inst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static struct crypto_template crypto_ecb_tmpl = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	.name = "ecb",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	.create = crypto_ecb_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	.module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static int __init crypto_ecb_module_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	return crypto_register_template(&crypto_ecb_tmpl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static void __exit crypto_ecb_module_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	crypto_unregister_template(&crypto_ecb_tmpl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) subsys_initcall(crypto_ecb_module_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) module_exit(crypto_ecb_module_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) MODULE_DESCRIPTION("ECB block cipher mode of operation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) MODULE_ALIAS_CRYPTO("ecb");