1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Cryptographic API. 4 * 5 * s390 generic implementation of the SHA Secure Hash Algorithms. 6 * 7 * Copyright IBM Corp. 2007 8 * Author(s): Jan Glauber (jang@de.ibm.com) 9 */ 10 11 #include <crypto/internal/hash.h> 12 #include <linux/module.h> 13 #include <asm/cpacf.h> 14 #include "sha.h" 15 16 int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len) 17 { 18 struct s390_sha_ctx *ctx = shash_desc_ctx(desc); 19 unsigned int bsize = crypto_shash_blocksize(desc->tfm); 20 unsigned int index, n; 21 22 /* how much is already in the buffer? */ 23 index = ctx->count & (bsize - 1); 24 ctx->count += len; 25 26 if ((index + len) < bsize) 27 goto store; 28 29 /* process one stored block */ 30 if (index) { 31 memcpy(ctx->buf + index, data, bsize - index); 32 cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize); 33 data += bsize - index; 34 len -= bsize - index; 35 index = 0; 36 } 37 38 /* process as many blocks as possible */ 39 if (len >= bsize) { 40 n = len & ~(bsize - 1); 41 cpacf_kimd(ctx->func, ctx->state, data, n); 42 data += n; 43 len -= n; 44 } 45 store: 46 if (len) 47 memcpy(ctx->buf + index , data, len); 48 49 return 0; 50 } 51 EXPORT_SYMBOL_GPL(s390_sha_update); 52 53 int s390_sha_final(struct shash_desc *desc, u8 *out) 54 { 55 struct s390_sha_ctx *ctx = shash_desc_ctx(desc); 56 unsigned int bsize = crypto_shash_blocksize(desc->tfm); 57 u64 bits; 58 unsigned int index, end, plen; 59 60 /* SHA-512 uses 128 bit padding length */ 61 plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8; 62 63 /* must perform manual padding */ 64 index = ctx->count & (bsize - 1); 65 end = (index < bsize - plen) ? bsize : (2 * bsize); 66 67 /* start pad with 1 */ 68 ctx->buf[index] = 0x80; 69 index++; 70 71 /* pad with zeros */ 72 memset(ctx->buf + index, 0x00, end - index - 8); 73 74 /* 75 * Append message length. Well, SHA-512 wants a 128 bit length value, 76 * nevertheless we use u64, should be enough for now... 77 */ 78 bits = ctx->count * 8; 79 memcpy(ctx->buf + end - 8, &bits, sizeof(bits)); 80 cpacf_kimd(ctx->func, ctx->state, ctx->buf, end); 81 82 /* copy digest to out */ 83 memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm)); 84 /* wipe context */ 85 memset(ctx, 0, sizeof *ctx); 86 87 return 0; 88 } 89 EXPORT_SYMBOL_GPL(s390_sha_final); 90 91 MODULE_LICENSE("GPL"); 92 MODULE_DESCRIPTION("s390 SHA cipher common functions"); 93