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/sha1.h> 21 #include <crypto/sha1_base.h> 22 #include <asm/byteorder.h> 23 24 void powerpc_sha_transform(u32 *state, const u8 *src); 25 26 static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data, 27 unsigned int len) 28 { 29 struct sha1_state *sctx = shash_desc_ctx(desc); 30 unsigned int partial, done; 31 const u8 *src; 32 33 partial = sctx->count & 0x3f; 34 sctx->count += len; 35 done = 0; 36 src = data; 37 38 if ((partial + len) > 63) { 39 40 if (partial) { 41 done = -partial; 42 memcpy(sctx->buffer + partial, data, done + 64); 43 src = sctx->buffer; 44 } 45 46 do { 47 powerpc_sha_transform(sctx->state, src); 48 done += 64; 49 src = data + done; 50 } while (done + 63 < len); 51 52 partial = 0; 53 } 54 memcpy(sctx->buffer + partial, src, len - done); 55 56 return 0; 57 } 58 59 60 /* Add padding and return the message digest. */ 61 static int powerpc_sha1_final(struct shash_desc *desc, u8 *out) 62 { 63 struct sha1_state *sctx = shash_desc_ctx(desc); 64 __be32 *dst = (__be32 *)out; 65 u32 i, index, padlen; 66 __be64 bits; 67 static const u8 padding[64] = { 0x80, }; 68 69 bits = cpu_to_be64(sctx->count << 3); 70 71 /* Pad out to 56 mod 64 */ 72 index = sctx->count & 0x3f; 73 padlen = (index < 56) ? (56 - index) : ((64+56) - index); 74 powerpc_sha1_update(desc, padding, padlen); 75 76 /* Append length */ 77 powerpc_sha1_update(desc, (const u8 *)&bits, sizeof(bits)); 78 79 /* Store state in digest */ 80 for (i = 0; i < 5; i++) 81 dst[i] = cpu_to_be32(sctx->state[i]); 82 83 /* Wipe context */ 84 memset(sctx, 0, sizeof *sctx); 85 86 return 0; 87 } 88 89 static int powerpc_sha1_export(struct shash_desc *desc, void *out) 90 { 91 struct sha1_state *sctx = shash_desc_ctx(desc); 92 93 memcpy(out, sctx, sizeof(*sctx)); 94 return 0; 95 } 96 97 static int powerpc_sha1_import(struct shash_desc *desc, const void *in) 98 { 99 struct sha1_state *sctx = shash_desc_ctx(desc); 100 101 memcpy(sctx, in, sizeof(*sctx)); 102 return 0; 103 } 104 105 static struct shash_alg alg = { 106 .digestsize = SHA1_DIGEST_SIZE, 107 .init = sha1_base_init, 108 .update = powerpc_sha1_update, 109 .final = powerpc_sha1_final, 110 .export = powerpc_sha1_export, 111 .import = powerpc_sha1_import, 112 .descsize = sizeof(struct sha1_state), 113 .statesize = sizeof(struct sha1_state), 114 .base = { 115 .cra_name = "sha1", 116 .cra_driver_name= "sha1-powerpc", 117 .cra_blocksize = SHA1_BLOCK_SIZE, 118 .cra_module = THIS_MODULE, 119 } 120 }; 121 122 static int __init sha1_powerpc_mod_init(void) 123 { 124 return crypto_register_shash(&alg); 125 } 126 127 static void __exit sha1_powerpc_mod_fini(void) 128 { 129 crypto_unregister_shash(&alg); 130 } 131 132 module_init(sha1_powerpc_mod_init); 133 module_exit(sha1_powerpc_mod_fini); 134 135 MODULE_LICENSE("GPL"); 136 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); 137 138 MODULE_ALIAS_CRYPTO("sha1"); 139 MODULE_ALIAS_CRYPTO("sha1-powerpc"); 140