diff options
Diffstat (limited to 'arch/sparc/crypto/md5_glue.c')
| -rw-r--r-- | arch/sparc/crypto/md5_glue.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/arch/sparc/crypto/md5_glue.c b/arch/sparc/crypto/md5_glue.c new file mode 100644 index 000000000000..603d723038ce --- /dev/null +++ b/arch/sparc/crypto/md5_glue.c @@ -0,0 +1,188 @@ +/* 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(0x67452301); + mctx->hash[1] = cpu_to_le32(0xefcdab89); + mctx->hash[2] = cpu_to_le32(0x98badcfe); + mctx->hash[3] = cpu_to_le32(0x10325476); + 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 Secure Hash Algorithm, sparc64 md5 opcode accelerated"); + +MODULE_ALIAS("md5"); |