1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Cryptographic API. 4 * 5 * powerpc implementation of the SHA1 Secure Hash Algorithm. 6 * 7 * Derived from cryptoapi implementation, adapted for in-place 8 * scatterlist interface. 9 * 10 * Derived from "crypto/sha1.c" 11 * Copyright (c) Alan Smithee. 12 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 13 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> 14 */ 15 #include <crypto/internal/hash.h> 16 #include <linux/init.h> 17 #include <linux/module.h> 18 #include <linux/mm.h> 19 #include <linux/types.h> 20 #include <crypto/sha.h> 21 #include <asm/byteorder.h> 22 23 void powerpc_sha_transform(u32 *state, const u8 *src); 24 25 static int powerpc_sha1_init(struct shash_desc *desc) 26 { 27 struct sha1_state *sctx = shash_desc_ctx(desc); 28 29 *sctx = (struct sha1_state){ 30 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, 31 }; 32 33 return 0; 34 } 35 36 static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data, 37 unsigned int len) 38 { 39 struct sha1_state *sctx = shash_desc_ctx(desc); 40 unsigned int partial, done; 41 const u8 *src; 42 43 partial = sctx->count & 0x3f; 44 sctx->count += len; 45 done = 0; 46 src = data; 47 48 if ((partial + len) > 63) { 49 50 if (partial) { 51 done = -partial; 52 memcpy(sctx->buffer + partial, data, done + 64); 53 src = sctx->buffer; 54 } 55 56 do { 57 powerpc_sha_transform(sctx->state, src); 58 done += 64; 59 src = data + done; 60 } while (done + 63 < len); 61 62 partial = 0; 63 } 64 memcpy(sctx->buffer + partial, src, len - done); 65 66 return 0; 67 } 68 69 70 /* Add padding and return the message digest. */ 71 static int powerpc_sha1_final(struct shash_desc *desc, u8 *out) 72 { 73 struct sha1_state *sctx = shash_desc_ctx(desc); 74 __be32 *dst = (__be32 *)out; 75 u32 i, index, padlen; 76 __be64 bits; 77 static const u8 padding[64] = { 0x80, }; 78 79 bits = cpu_to_be64(sctx->count << 3); 80 81 /* Pad out to 56 mod 64 */ 82 index = sctx->count & 0x3f; 83 padlen = (index < 56) ? (56 - index) : ((64+56) - index); 84 powerpc_sha1_update(desc, padding, padlen); 85 86 /* Append length */ 87 powerpc_sha1_update(desc, (const u8 *)&bits, sizeof(bits)); 88 89 /* Store state in digest */ 90 for (i = 0; i < 5; i++) 91 dst[i] = cpu_to_be32(sctx->state[i]); 92 93 /* Wipe context */ 94 memset(sctx, 0, sizeof *sctx); 95 96 return 0; 97 } 98 99 static int powerpc_sha1_export(struct shash_desc *desc, void *out) 100 { 101 struct sha1_state *sctx = shash_desc_ctx(desc); 102 103 memcpy(out, sctx, sizeof(*sctx)); 104 return 0; 105 } 106 107 static int powerpc_sha1_import(struct shash_desc *desc, const void *in) 108 { 109 struct sha1_state *sctx = shash_desc_ctx(desc); 110 111 memcpy(sctx, in, sizeof(*sctx)); 112 return 0; 113 } 114 115 static struct shash_alg alg = { 116 .digestsize = SHA1_DIGEST_SIZE, 117 .init = powerpc_sha1_init, 118 .update = powerpc_sha1_update, 119 .final = powerpc_sha1_final, 120 .export = powerpc_sha1_export, 121 .import = powerpc_sha1_import, 122 .descsize = sizeof(struct sha1_state), 123 .statesize = sizeof(struct sha1_state), 124 .base = { 125 .cra_name = "sha1", 126 .cra_driver_name= "sha1-powerpc", 127 .cra_blocksize = SHA1_BLOCK_SIZE, 128 .cra_module = THIS_MODULE, 129 } 130 }; 131 132 static int __init sha1_powerpc_mod_init(void) 133 { 134 return crypto_register_shash(&alg); 135 } 136 137 static void __exit sha1_powerpc_mod_fini(void) 138 { 139 crypto_unregister_shash(&alg); 140 } 141 142 module_init(sha1_powerpc_mod_init); 143 module_exit(sha1_powerpc_mod_fini); 144 145 MODULE_LICENSE("GPL"); 146 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); 147 148 MODULE_ALIAS_CRYPTO("sha1"); 149 MODULE_ALIAS_CRYPTO("sha1-powerpc"); 150