1 files changed, 92 insertions, 0 deletions
diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c
new file mode 100644
index 000000000..cf0718d12
--- /dev/null
+++ b/arch/s390/crypto/sha_common.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cryptographic API.
+ *
+ * s390 generic implementation of the SHA Secure Hash Algorithms.
+ *
+ * Copyright IBM Corp. 2007
+ * Author(s): Jan Glauber (jang@de.ibm.com)
+ */
+
+#include <crypto/internal/hash.h>
+#include <linux/module.h>
+#include <asm/cpacf.h>
+#include "sha.h"
+
+int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
+{
+	struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
+	unsigned int bsize = crypto_shash_blocksize(desc->tfm);
+	unsigned int index, n;
+
+	/* how much is already in the buffer? */
+	index = ctx->count & (bsize - 1);
+	ctx->count += len;
+
+	if ((index + len) < bsize)
+		goto store;
+
+	/* process one stored block */
+	if (index) {
+		memcpy(ctx->buf + index, data, bsize - index);
+		cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
+		data += bsize - index;
+		len -= bsize - index;
+		index = 0;
+	}
+
+	/* process as many blocks as possible */
+	if (len >= bsize) {
+		n = len & ~(bsize - 1);
+		cpacf_kimd(ctx->func, ctx->state, data, n);
+		data += n;
+		len -= n;
+	}
+store:
+	if (len)
+		memcpy(ctx->buf + index , data, len);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(s390_sha_update);
+
+int s390_sha_final(struct shash_desc *desc, u8 *out)
+{
+	struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
+	unsigned int bsize = crypto_shash_blocksize(desc->tfm);
+	u64 bits;
+	unsigned int index, end, plen;
+
+	/* SHA-512 uses 128 bit padding length */
+	plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
+
+	/* must perform manual padding */
+	index = ctx->count & (bsize - 1);
+	end = (index < bsize - plen) ? bsize : (2 * bsize);
+
+	/* start pad with 1 */
+	ctx->buf[index] = 0x80;
+	index++;
+
+	/* pad with zeros */
+	memset(ctx->buf + index, 0x00, end - index - 8);
+
+	/*
+	 * Append message length. Well, SHA-512 wants a 128 bit length value,
+	 * nevertheless we use u64, should be enough for now...
+	 */
+	bits = ctx->count * 8;
+	memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
+	cpacf_kimd(ctx->func, ctx->state, ctx->buf, end);
+
+	/* copy digest to out */
+	memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
+	/* wipe context */
+	memset(ctx, 0, sizeof *ctx);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(s390_sha_final);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("s390 SHA cipher common functions");