/* Glue code for MD5 hashing optimized for sparc64 crypto opcodes. * * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c * and crypto/md5.c which are: * * Copyright (c) Alan Smithee. * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> * Copyright (c) Mathias Krause <minipli@googlemail.com> * Copyright (c) Cryptoapi developers. * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <crypto/internal/hash.h> #include <linux/init.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/cryptohash.h> #include <linux/types.h> #include <crypto/md5.h> #include <asm/pstate.h> #include <asm/elf.h> #include "opcodes.h" asmlinkage void md5_sparc64_transform(u32 *digest, const char *data, unsigned int rounds); static int md5_sparc64_init(struct shash_desc *desc) { struct md5_state *mctx = shash_desc_ctx(desc); mctx->hash[0] = cpu_to_le32(MD5_H0); mctx->hash[1] = cpu_to_le32(MD5_H1); mctx->hash[2] = cpu_to_le32(MD5_H2); mctx->hash[3] = cpu_to_le32(MD5_H3); mctx->byte_count = 0; return 0; } static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data, unsigned int len, unsigned int partial) { unsigned int done = 0; sctx->byte_count += len; if (partial) { done = MD5_HMAC_BLOCK_SIZE - partial; memcpy((u8 *)sctx->block + partial, data, done); md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1); } if (len - done >= MD5_HMAC_BLOCK_SIZE) { const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE; md5_sparc64_transform(sctx->hash, data + done, rounds); done += rounds * MD5_HMAC_BLOCK_SIZE; } memcpy(sctx->block, data + done, len - done); } static int md5_sparc64_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct md5_state *sctx = shash_desc_ctx(desc); unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE; /* Handle the fast case right here */ if (partial + len < MD5_HMAC_BLOCK_SIZE) { sctx->byte_count += len; memcpy((u8 *)sctx->block + partial, data, len); } else __md5_sparc64_update(sctx, data, len, partial); return 0; } /* Add padding and return the message digest. */ static int md5_sparc64_final(struct shash_desc *desc, u8 *out) { struct md5_state *sctx = shash_desc_ctx(desc); unsigned int i, index, padlen; u32 *dst = (u32 *)out; __le64 bits; static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, }; bits = cpu_to_le64(sctx->byte_count << 3); /* Pad out to 56 mod 64 and append length */ index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE; padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index); /* We need to fill a whole block for __md5_sparc64_update() */ if (padlen <= 56) { sctx->byte_count += padlen; memcpy((u8 *)sctx->block + index, padding, padlen); } else { __md5_sparc64_update(sctx, padding, padlen, index); } __md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56); /* Store state in digest */ for (i = 0; i < MD5_HASH_WORDS; i++) dst[i] = sctx->hash[i]; /* Wipe context */ memset(sctx, 0, sizeof(*sctx)); return 0; } static int md5_sparc64_export(struct shash_desc *desc, void *out) { struct md5_state *sctx = shash_desc_ctx(desc); memcpy(out, sctx, sizeof(*sctx)); return 0; } static int md5_sparc64_import(struct shash_desc *desc, const void *in) { struct md5_state *sctx = shash_desc_ctx(desc); memcpy(sctx, in, sizeof(*sctx)); return 0; } static struct shash_alg alg = { .digestsize = MD5_DIGEST_SIZE, .init = md5_sparc64_init, .update = md5_sparc64_update, .final = md5_sparc64_final, .export = md5_sparc64_export, .import = md5_sparc64_import, .descsize = sizeof(struct md5_state), .statesize = sizeof(struct md5_state), .base = { .cra_name = "md5", .cra_driver_name= "md5-sparc64", .cra_priority = SPARC_CR_OPCODE_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = MD5_HMAC_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static bool __init sparc64_has_md5_opcode(void) { unsigned long cfr; if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) return false; __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); if (!(cfr & CFR_MD5)) return false; return true; } static int __init md5_sparc64_mod_init(void) { if (sparc64_has_md5_opcode()) { pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n"); return crypto_register_shash(&alg); } pr_info("sparc64 md5 opcode not available.\n"); return -ENODEV; } static void __exit md5_sparc64_mod_fini(void) { crypto_unregister_shash(&alg); } module_init(md5_sparc64_mod_init); module_exit(md5_sparc64_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("MD5 Message Digest Algorithm, sparc64 md5 opcode accelerated"); MODULE_ALIAS_CRYPTO("md5"); #include "crop_devid.c"