Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Glue code for MD5 implementation for PPC assembler * * Based on generic implementation. * * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de> */ #include <crypto/internal/hash.h> #include <linux/init.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/types.h> #include <crypto/md5.h> #include <asm/byteorder.h> extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks); static inline void ppc_md5_clear_context(struct md5_state *sctx) { int count = sizeof(struct md5_state) >> 2; u32 *ptr = (u32 *)sctx; /* make sure we can clear the fast way */ BUILD_BUG_ON(sizeof(struct md5_state) % 4); do { *ptr++ = 0; } while (--count); } static int ppc_md5_init(struct shash_desc *desc) { struct md5_state *sctx = shash_desc_ctx(desc); sctx->hash[0] = MD5_H0; sctx->hash[1] = MD5_H1; sctx->hash[2] = MD5_H2; sctx->hash[3] = MD5_H3; sctx->byte_count = 0; return 0; } static int ppc_md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct md5_state *sctx = shash_desc_ctx(desc); const unsigned int offset = sctx->byte_count & 0x3f; unsigned int avail = 64 - offset; const u8 *src = data; sctx->byte_count += len; if (avail > len) { memcpy((char *)sctx->block + offset, src, len); return 0; } if (offset) { memcpy((char *)sctx->block + offset, src, avail); ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1); len -= avail; src += avail; } if (len > 63) { ppc_md5_transform(sctx->hash, src, len >> 6); src += len & ~0x3f; len &= 0x3f; } memcpy((char *)sctx->block, src, len); return 0; } static int ppc_md5_final(struct shash_desc *desc, u8 *out) { struct md5_state *sctx = shash_desc_ctx(desc); const unsigned int offset = sctx->byte_count & 0x3f; const u8 *src = (const u8 *)sctx->block; u8 *p = (u8 *)src + offset; int padlen = 55 - offset; __le64 *pbits = (__le64 *)((char *)sctx->block + 56); __le32 *dst = (__le32 *)out; *p++ = 0x80; if (padlen < 0) { memset(p, 0x00, padlen + sizeof (u64)); ppc_md5_transform(sctx->hash, src, 1); p = (char *)sctx->block; padlen = 56; } memset(p, 0, padlen); *pbits = cpu_to_le64(sctx->byte_count << 3); ppc_md5_transform(sctx->hash, src, 1); dst[0] = cpu_to_le32(sctx->hash[0]); dst[1] = cpu_to_le32(sctx->hash[1]); dst[2] = cpu_to_le32(sctx->hash[2]); dst[3] = cpu_to_le32(sctx->hash[3]); ppc_md5_clear_context(sctx); return 0; } static int ppc_md5_export(struct shash_desc *desc, void *out) { struct md5_state *sctx = shash_desc_ctx(desc); memcpy(out, sctx, sizeof(*sctx)); return 0; } static int ppc_md5_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 = ppc_md5_init, .update = ppc_md5_update, .final = ppc_md5_final, .export = ppc_md5_export, .import = ppc_md5_import, .descsize = sizeof(struct md5_state), .statesize = sizeof(struct md5_state), .base = { .cra_name = "md5", .cra_driver_name= "md5-ppc", .cra_priority = 200, .cra_blocksize = MD5_HMAC_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static int __init ppc_md5_mod_init(void) { return crypto_register_shash(&alg); } static void __exit ppc_md5_mod_fini(void) { crypto_unregister_shash(&alg); } module_init(ppc_md5_mod_init); module_exit(ppc_md5_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler"); MODULE_ALIAS_CRYPTO("md5"); MODULE_ALIAS_CRYPTO("md5-ppc"); |