rpcgss: simplify make_checksum

We're doing some pointless translation between krb5 constants and kernel
crypto string names.

Also clean up some related spkm3 code as necessary.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/gss_krb5.h

@@ -116,7 +116,7 @@ enum seal_alg {
 #define ENCTYPE_UNKNOWN         0x01ff
 
 s32
-make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
+make_checksum(char *, char *header, int hdrlen, struct xdr_buf *body,
 		   int body_offset, struct xdr_netobj *cksum);
 
 u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,

net/sunrpc/auth_gss/gss_krb5_crypto.c

@@ -130,23 +130,13 @@ checksummer(struct scatterlist *sg, void *data)
 
 /* checksum the plaintext data and hdrlen bytes of the token header */
 s32
-make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
+make_checksum(char *cksumname, char *header, int hdrlen, struct xdr_buf *body,
 		   int body_offset, struct xdr_netobj *cksum)
 {
-	char                            *cksumname;
 	struct hash_desc                desc; /* XXX add to ctx? */
 	struct scatterlist              sg[1];
 	int err;
 
-	switch (cksumtype) {
-		case CKSUMTYPE_RSA_MD5:
-			cksumname = "md5";
-			break;
-		default:
-			dprintk("RPC:      krb5_make_checksum:"
-				" unsupported checksum %d", cksumtype);
-			return GSS_S_FAILURE;
-	}
 	desc.tfm = crypto_alloc_hash(cksumname, 0, CRYPTO_ALG_ASYNC);
 	if (IS_ERR(desc.tfm))
 		return GSS_S_FAILURE;

net/sunrpc/auth_gss/gss_krb5_seal.c

@@ -108,7 +108,7 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
 	*(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
 	memset(krb5_hdr + 4, 0xff, 4);
 
-	if (make_checksum(CKSUMTYPE_RSA_MD5, krb5_hdr, 8, text, 0, &md5cksum))
+	if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum))
 		goto out_err;
 
 	if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,

net/sunrpc/auth_gss/gss_krb5_unseal.c

@@ -114,8 +114,7 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
 	if (signalg != SGN_ALG_DES_MAC_MD5)
 		goto out;
 
-	ret = make_checksum(CKSUMTYPE_RSA_MD5, ptr - 2, 8,
-				 message_buffer, 0, &md5cksum);
+	ret = make_checksum("md5", ptr - 2, 8, message_buffer, 0, &md5cksum);
 	if (ret)
 		goto out;
 

net/sunrpc/auth_gss/gss_krb5_wrap.c

@@ -176,7 +176,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
 	/* XXXJBF: UGH!: */
 	tmp_pages = buf->pages;
 	buf->pages = pages;
-	if (make_checksum(CKSUMTYPE_RSA_MD5, krb5_hdr, 8, buf,
+	if (make_checksum("md5", krb5_hdr, 8, buf,
 				offset + headlen - blocksize, &md5cksum))
 		goto out_err;
 	buf->pages = tmp_pages;
@@ -272,7 +272,7 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf)
 			ptr + 22 - (unsigned char *)buf->head[0].iov_base))
 		goto out;
 
-	ret = make_checksum(CKSUMTYPE_RSA_MD5, ptr - 2, 8, buf,
+	ret = make_checksum("md5", ptr - 2, 8, buf,
 		 ptr + 22 - (unsigned char *)buf->head[0].iov_base, &md5cksum);
 	if (ret)
 		goto out;