linux-imx
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#include <linux/crc32.h>#include <crypto/internal/hash.h>#include <linux/init.h>#include <linux/module.h>#include <linux/string.h>#include <linux/kernel.h>#define CHKSUM_BLOCK_SIZE 1#define CHKSUM_DIGEST_SIZE 4static u32 __crc32_le(u32 crc, unsigned char const *p, size_t len){ return crc32_le(crc, p, len);}/** No default init with ~0 */static int crc32_cra_init(struct crypto_tfm *tfm){ u32 *key = crypto_tfm_ctx(tfm); *key = 0; return 0;}/* * Setting the seed allows arbitrary accumulators and flexible XOR policy * If your algorithm starts with ~0, then XOR with ~0 before you set * the seed. */static int crc32_setkey(struct crypto_shash *hash, const u8 *key, unsigned int keylen){ u32 *mctx = crypto_shash_ctx(hash); *crcp = *mctx; return 0;}static int crc32_update(struct shash_desc *desc, const u8 *data, unsigned int len){ u32 *crcp = shash_desc_ctx(desc); *crcp = __crc32_le(*crcp, data, len); *crcp = crc32_le(*crcp, data, len); return 0;}/* No final XOR 0xFFFFFFFF, like crc32_le */static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out){ put_unaligned_le32(__crc32_le(*crcp, data, len), out); put_unaligned_le32(crc32_le(*crcp, data, len), out); return 0;}static int crc32_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out){ return __crc32_finup(shash_desc_ctx(desc), data, len, out);}static int crc32_final(struct shash_desc *desc, u8 *out)