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346 lines
7.5 KiB
346 lines
7.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions |
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* |
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* Module based on arm64/crypto/crc32-arm.c |
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* |
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* Copyright (C) 2014 Linaro Ltd <[email protected]> |
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* Copyright (C) 2018 MIPS Tech, LLC |
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*/ |
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#include <linux/cpufeature.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <asm/mipsregs.h> |
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#include <asm/unaligned.h> |
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#include <crypto/internal/hash.h> |
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enum crc_op_size { |
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b, h, w, d, |
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}; |
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enum crc_type { |
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crc32, |
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crc32c, |
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}; |
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#ifndef TOOLCHAIN_SUPPORTS_CRC |
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#define _ASM_MACRO_CRC32(OP, SZ, TYPE) \ |
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_ASM_MACRO_3R(OP, rt, rs, rt2, \ |
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".ifnc \\rt, \\rt2\n\t" \ |
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".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \ |
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".endif\n\t" \ |
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_ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \ |
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((SZ) << 6) | ((TYPE) << 8)) \ |
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_ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \ |
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((SZ) << 14) | ((TYPE) << 3))) |
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_ASM_MACRO_CRC32(crc32b, 0, 0); |
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_ASM_MACRO_CRC32(crc32h, 1, 0); |
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_ASM_MACRO_CRC32(crc32w, 2, 0); |
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_ASM_MACRO_CRC32(crc32d, 3, 0); |
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_ASM_MACRO_CRC32(crc32cb, 0, 1); |
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_ASM_MACRO_CRC32(crc32ch, 1, 1); |
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_ASM_MACRO_CRC32(crc32cw, 2, 1); |
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_ASM_MACRO_CRC32(crc32cd, 3, 1); |
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#define _ASM_SET_CRC "" |
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#else /* !TOOLCHAIN_SUPPORTS_CRC */ |
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#define _ASM_SET_CRC ".set\tcrc\n\t" |
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#endif |
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#define _CRC32(crc, value, size, type) \ |
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do { \ |
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__asm__ __volatile__( \ |
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".set push\n\t" \ |
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_ASM_SET_CRC \ |
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#type #size " %0, %1, %0\n\t" \ |
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".set pop" \ |
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: "+r" (crc) \ |
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: "r" (value)); \ |
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} while (0) |
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#define CRC32(crc, value, size) \ |
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_CRC32(crc, value, size, crc32) |
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#define CRC32C(crc, value, size) \ |
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_CRC32(crc, value, size, crc32c) |
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static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len) |
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{ |
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u32 crc = crc_; |
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#ifdef CONFIG_64BIT |
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while (len >= sizeof(u64)) { |
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u64 value = get_unaligned_le64(p); |
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CRC32(crc, value, d); |
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p += sizeof(u64); |
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len -= sizeof(u64); |
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} |
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if (len & sizeof(u32)) { |
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#else /* !CONFIG_64BIT */ |
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while (len >= sizeof(u32)) { |
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#endif |
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u32 value = get_unaligned_le32(p); |
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CRC32(crc, value, w); |
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p += sizeof(u32); |
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len -= sizeof(u32); |
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} |
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if (len & sizeof(u16)) { |
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u16 value = get_unaligned_le16(p); |
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CRC32(crc, value, h); |
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p += sizeof(u16); |
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} |
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if (len & sizeof(u8)) { |
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u8 value = *p++; |
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CRC32(crc, value, b); |
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} |
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return crc; |
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} |
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static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len) |
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{ |
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u32 crc = crc_; |
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#ifdef CONFIG_64BIT |
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while (len >= sizeof(u64)) { |
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u64 value = get_unaligned_le64(p); |
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CRC32C(crc, value, d); |
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p += sizeof(u64); |
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len -= sizeof(u64); |
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} |
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if (len & sizeof(u32)) { |
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#else /* !CONFIG_64BIT */ |
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while (len >= sizeof(u32)) { |
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#endif |
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u32 value = get_unaligned_le32(p); |
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CRC32C(crc, value, w); |
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p += sizeof(u32); |
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len -= sizeof(u32); |
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} |
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if (len & sizeof(u16)) { |
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u16 value = get_unaligned_le16(p); |
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CRC32C(crc, value, h); |
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p += sizeof(u16); |
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} |
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if (len & sizeof(u8)) { |
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u8 value = *p++; |
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CRC32C(crc, value, b); |
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} |
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return crc; |
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} |
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#define CHKSUM_BLOCK_SIZE 1 |
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#define CHKSUM_DIGEST_SIZE 4 |
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struct chksum_ctx { |
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u32 key; |
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}; |
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struct chksum_desc_ctx { |
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u32 crc; |
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}; |
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static int chksum_init(struct shash_desc *desc) |
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{ |
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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ctx->crc = mctx->key; |
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return 0; |
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} |
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/* |
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* Setting the seed allows arbitrary accumulators and flexible XOR policy |
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* If your algorithm starts with ~0, then XOR with ~0 before you set |
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* the seed. |
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*/ |
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static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct chksum_ctx *mctx = crypto_shash_ctx(tfm); |
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if (keylen != sizeof(mctx->key)) |
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return -EINVAL; |
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mctx->key = get_unaligned_le32(key); |
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return 0; |
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} |
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static int chksum_update(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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ctx->crc = crc32_mips_le_hw(ctx->crc, data, length); |
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return 0; |
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} |
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static int chksumc_update(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length); |
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return 0; |
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} |
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static int chksum_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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put_unaligned_le32(ctx->crc, out); |
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return 0; |
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} |
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static int chksumc_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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put_unaligned_le32(~ctx->crc, out); |
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return 0; |
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} |
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static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out) |
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{ |
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put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out); |
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return 0; |
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} |
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static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out) |
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{ |
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put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out); |
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return 0; |
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} |
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static int chksum_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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return __chksum_finup(ctx->crc, data, len, out); |
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} |
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static int chksumc_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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return __chksumc_finup(ctx->crc, data, len, out); |
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} |
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static int chksum_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int length, u8 *out) |
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{ |
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); |
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return __chksum_finup(mctx->key, data, length, out); |
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} |
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static int chksumc_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int length, u8 *out) |
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{ |
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); |
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return __chksumc_finup(mctx->key, data, length, out); |
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} |
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static int chksum_cra_init(struct crypto_tfm *tfm) |
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{ |
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struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); |
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mctx->key = ~0; |
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return 0; |
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} |
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static struct shash_alg crc32_alg = { |
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.digestsize = CHKSUM_DIGEST_SIZE, |
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.setkey = chksum_setkey, |
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.init = chksum_init, |
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.update = chksum_update, |
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.final = chksum_final, |
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.finup = chksum_finup, |
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.digest = chksum_digest, |
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.descsize = sizeof(struct chksum_desc_ctx), |
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.base = { |
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.cra_name = "crc32", |
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.cra_driver_name = "crc32-mips-hw", |
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.cra_priority = 300, |
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
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.cra_blocksize = CHKSUM_BLOCK_SIZE, |
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.cra_alignmask = 0, |
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.cra_ctxsize = sizeof(struct chksum_ctx), |
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.cra_module = THIS_MODULE, |
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.cra_init = chksum_cra_init, |
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} |
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}; |
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static struct shash_alg crc32c_alg = { |
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.digestsize = CHKSUM_DIGEST_SIZE, |
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.setkey = chksum_setkey, |
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.init = chksum_init, |
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.update = chksumc_update, |
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.final = chksumc_final, |
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.finup = chksumc_finup, |
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.digest = chksumc_digest, |
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.descsize = sizeof(struct chksum_desc_ctx), |
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.base = { |
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.cra_name = "crc32c", |
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.cra_driver_name = "crc32c-mips-hw", |
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.cra_priority = 300, |
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
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.cra_blocksize = CHKSUM_BLOCK_SIZE, |
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.cra_alignmask = 0, |
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.cra_ctxsize = sizeof(struct chksum_ctx), |
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.cra_module = THIS_MODULE, |
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.cra_init = chksum_cra_init, |
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} |
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}; |
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static int __init crc32_mod_init(void) |
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{ |
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int err; |
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err = crypto_register_shash(&crc32_alg); |
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if (err) |
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return err; |
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err = crypto_register_shash(&crc32c_alg); |
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if (err) { |
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crypto_unregister_shash(&crc32_alg); |
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return err; |
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} |
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return 0; |
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} |
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static void __exit crc32_mod_exit(void) |
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{ |
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crypto_unregister_shash(&crc32_alg); |
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crypto_unregister_shash(&crc32c_alg); |
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} |
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MODULE_AUTHOR("Marcin Nowakowski <[email protected]"); |
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MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions"); |
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MODULE_LICENSE("GPL v2"); |
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module_cpu_feature_match(MIPS_CRC32, crc32_mod_init); |
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module_exit(crc32_mod_exit);
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