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Sparse[1] is a semantic parser, capable of finding out the potential problems of Linux kernel code. This patch fixed the warnings. [1] https://www.kernel.org/doc/html/latest/dev-tools/sparse.html
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* cryptosha256.c
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*/
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#include <crypto/internal/hash.h>
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#include <linux/module.h>
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#define SHA256_LENGTH 32
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static void show_hash_result(char *plaintext, char *hash_sha256)
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{
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int i;
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char str[SHA256_LENGTH * 2 + 1];
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pr_info("sha256 test for string: \"%s\"\n", plaintext);
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for (i = 0; i < SHA256_LENGTH; i++)
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sprintf(&str[i * 2], "%02x", (unsigned char)hash_sha256[i]);
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str[i * 2] = 0;
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pr_info("%s\n", str);
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}
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static int cryptosha256_init(void)
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{
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char *plaintext = "This is a test";
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char hash_sha256[SHA256_LENGTH];
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struct crypto_shash *sha256;
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struct shash_desc *shash;
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sha256 = crypto_alloc_shash("sha256", 0, 0);
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if (IS_ERR(sha256))
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return -1;
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shash = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(sha256),
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GFP_KERNEL);
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if (!shash)
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return -ENOMEM;
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shash->tfm = sha256;
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if (crypto_shash_init(shash))
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return -1;
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if (crypto_shash_update(shash, plaintext, strlen(plaintext)))
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return -1;
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if (crypto_shash_final(shash, hash_sha256))
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return -1;
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kfree(shash);
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crypto_free_shash(sha256);
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show_hash_result(plaintext, hash_sha256);
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return 0;
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}
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static void cryptosha256_exit(void)
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{
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}
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module_init(cryptosha256_init);
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module_exit(cryptosha256_exit);
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MODULE_DESCRIPTION("sha256 hash test");
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MODULE_LICENSE("GPL");
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