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184 lines
4.5 KiB
184 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes. |
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* |
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* This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c |
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* |
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* Copyright (c) Alan Smithee. |
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* Copyright (c) Andrew McDonald <[email protected]> |
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* Copyright (c) Jean-Francois Dive <[email protected]> |
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* Copyright (c) Mathias Krause <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <crypto/internal/hash.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/mm.h> |
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#include <linux/types.h> |
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#include <crypto/sha1.h> |
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#include <asm/pstate.h> |
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#include <asm/elf.h> |
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#include "opcodes.h" |
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asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data, |
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unsigned int rounds); |
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static int sha1_sparc64_init(struct shash_desc *desc) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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*sctx = (struct sha1_state){ |
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.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, |
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}; |
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return 0; |
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} |
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static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data, |
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unsigned int len, unsigned int partial) |
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{ |
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unsigned int done = 0; |
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sctx->count += len; |
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if (partial) { |
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done = SHA1_BLOCK_SIZE - partial; |
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memcpy(sctx->buffer + partial, data, done); |
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sha1_sparc64_transform(sctx->state, sctx->buffer, 1); |
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} |
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if (len - done >= SHA1_BLOCK_SIZE) { |
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const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; |
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sha1_sparc64_transform(sctx->state, data + done, rounds); |
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done += rounds * SHA1_BLOCK_SIZE; |
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} |
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memcpy(sctx->buffer, data + done, len - done); |
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} |
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static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; |
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/* Handle the fast case right here */ |
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if (partial + len < SHA1_BLOCK_SIZE) { |
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sctx->count += len; |
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memcpy(sctx->buffer + partial, data, len); |
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} else |
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__sha1_sparc64_update(sctx, data, len, partial); |
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return 0; |
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} |
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/* Add padding and return the message digest. */ |
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static int sha1_sparc64_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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unsigned int i, index, padlen; |
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__be32 *dst = (__be32 *)out; |
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__be64 bits; |
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static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; |
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bits = cpu_to_be64(sctx->count << 3); |
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/* Pad out to 56 mod 64 and append length */ |
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index = sctx->count % SHA1_BLOCK_SIZE; |
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padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); |
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/* We need to fill a whole block for __sha1_sparc64_update() */ |
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if (padlen <= 56) { |
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sctx->count += padlen; |
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memcpy(sctx->buffer + index, padding, padlen); |
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} else { |
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__sha1_sparc64_update(sctx, padding, padlen, index); |
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} |
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__sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); |
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/* Store state in digest */ |
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for (i = 0; i < 5; i++) |
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dst[i] = cpu_to_be32(sctx->state[i]); |
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/* Wipe context */ |
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memset(sctx, 0, sizeof(*sctx)); |
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return 0; |
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} |
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static int sha1_sparc64_export(struct shash_desc *desc, void *out) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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memcpy(out, sctx, sizeof(*sctx)); |
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return 0; |
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} |
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static int sha1_sparc64_import(struct shash_desc *desc, const void *in) |
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{ |
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struct sha1_state *sctx = shash_desc_ctx(desc); |
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memcpy(sctx, in, sizeof(*sctx)); |
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return 0; |
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} |
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static struct shash_alg alg = { |
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.digestsize = SHA1_DIGEST_SIZE, |
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.init = sha1_sparc64_init, |
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.update = sha1_sparc64_update, |
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.final = sha1_sparc64_final, |
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.export = sha1_sparc64_export, |
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.import = sha1_sparc64_import, |
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.descsize = sizeof(struct sha1_state), |
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.statesize = sizeof(struct sha1_state), |
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.base = { |
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.cra_name = "sha1", |
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.cra_driver_name= "sha1-sparc64", |
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.cra_priority = SPARC_CR_OPCODE_PRIORITY, |
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.cra_blocksize = SHA1_BLOCK_SIZE, |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static bool __init sparc64_has_sha1_opcode(void) |
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{ |
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unsigned long cfr; |
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if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) |
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return false; |
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__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); |
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if (!(cfr & CFR_SHA1)) |
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return false; |
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return true; |
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} |
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static int __init sha1_sparc64_mod_init(void) |
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{ |
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if (sparc64_has_sha1_opcode()) { |
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pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n"); |
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return crypto_register_shash(&alg); |
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} |
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pr_info("sparc64 sha1 opcode not available.\n"); |
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return -ENODEV; |
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} |
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static void __exit sha1_sparc64_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_init(sha1_sparc64_mod_init); |
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module_exit(sha1_sparc64_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated"); |
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MODULE_ALIAS_CRYPTO("sha1"); |
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#include "crop_devid.c"
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