1/* 2 * Cryptographic API. 3 * 4 * s390 generic implementation of the SHA Secure Hash Algorithms. 5 * 6 * Copyright IBM Corp. 2007 7 * Author(s): Jan Glauber (jang@de.ibm.com) 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the Free 11 * Software Foundation; either version 2 of the License, or (at your option) 12 * any later version. 13 * 14 */ 15 16#include <crypto/internal/hash.h> 17#include "sha.h" 18#include "crypt_s390.h" 19 20int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len) 21{ 22 struct s390_sha_ctx *ctx = shash_desc_ctx(desc); 23 unsigned int bsize = crypto_shash_blocksize(desc->tfm); 24 unsigned int index; 25 int ret; 26 27 /* how much is already in the buffer? */ 28 index = ctx->count & (bsize - 1); 29 ctx->count += len; 30 31 if ((index + len) < bsize) 32 goto store; 33 34 /* process one stored block */ 35 if (index) { 36 memcpy(ctx->buf + index, data, bsize - index); 37 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize); 38 BUG_ON(ret != bsize); 39 data += bsize - index; 40 len -= bsize - index; 41 } 42 43 /* process as many blocks as possible */ 44 if (len >= bsize) { 45 ret = crypt_s390_kimd(ctx->func, ctx->state, data, 46 len & ~(bsize - 1)); 47 BUG_ON(ret != (len & ~(bsize - 1))); 48 data += ret; 49 len -= ret; 50 } 51store: 52 if (len) 53 memcpy(ctx->buf + index , data, len); 54 55 return 0; 56} 57EXPORT_SYMBOL_GPL(s390_sha_update); 58 59int s390_sha_final(struct shash_desc *desc, u8 *out) 60{ 61 struct s390_sha_ctx *ctx = shash_desc_ctx(desc); 62 unsigned int bsize = crypto_shash_blocksize(desc->tfm); 63 u64 bits; 64 unsigned int index, end, plen; 65 int ret; 66 67 /* SHA-512 uses 128 bit padding length */ 68 plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8; 69 70 /* must perform manual padding */ 71 index = ctx->count & (bsize - 1); 72 end = (index < bsize - plen) ? bsize : (2 * bsize); 73 74 /* start pad with 1 */ 75 ctx->buf[index] = 0x80; 76 index++; 77 78 /* pad with zeros */ 79 memset(ctx->buf + index, 0x00, end - index - 8); 80 81 /* 82 * Append message length. Well, SHA-512 wants a 128 bit length value, 83 * nevertheless we use u64, should be enough for now... 84 */ 85 bits = ctx->count * 8; 86 memcpy(ctx->buf + end - 8, &bits, sizeof(bits)); 87 88 ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end); 89 BUG_ON(ret != end); 90 91 /* copy digest to out */ 92 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm)); 93 /* wipe context */ 94 memset(ctx, 0, sizeof *ctx); 95 96 return 0; 97} 98EXPORT_SYMBOL_GPL(s390_sha_final); 99 100MODULE_LICENSE("GPL"); 101MODULE_DESCRIPTION("s390 SHA cipher common functions"); 102