SUNRPC: Remove unused make_checksum

Commit ec596aa ("SUNRPC: Remove code behind
CONFIG_RPCSEC_GSS_KRB5_SIMPLIFIED") was the last user of the
make_checksum() function.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/auth_gss/gss_krb5_crypto.c

@@ -148,96 +148,6 @@ checksummer(struct scatterlist *sg, void *data)
 	return crypto_ahash_update(req);
 }
 
-/*
- * checksum the plaintext data and hdrlen bytes of the token header
- * The checksum is performed over the first 8 bytes of the
- * gss token header and then over the data body
- */
-u32
-make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
-	      struct xdr_buf *body, int body_offset, u8 *cksumkey,
-	      unsigned int usage, struct xdr_netobj *cksumout)
-{
-	struct crypto_ahash *tfm;
-	struct ahash_request *req;
-	struct scatterlist              sg[1];
-	int err = -1;
-	u8 *checksumdata;
-	unsigned int checksumlen;
-
-	if (cksumout->len < kctx->gk5e->cksumlength) {
-		dprintk("%s: checksum buffer length, %u, too small for %s\n",
-			__func__, cksumout->len, kctx->gk5e->name);
-		return GSS_S_FAILURE;
-	}
-
-	checksumdata = kmalloc(GSS_KRB5_MAX_CKSUM_LEN, GFP_KERNEL);
-	if (checksumdata == NULL)
-		return GSS_S_FAILURE;
-
-	tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
-	if (IS_ERR(tfm))
-		goto out_free_cksum;
-
-	req = ahash_request_alloc(tfm, GFP_KERNEL);
-	if (!req)
-		goto out_free_ahash;
-
-	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
-
-	checksumlen = crypto_ahash_digestsize(tfm);
-
-	if (cksumkey != NULL) {
-		err = crypto_ahash_setkey(tfm, cksumkey,
-					  kctx->gk5e->keylength);
-		if (err)
-			goto out;
-	}
-
-	err = crypto_ahash_init(req);
-	if (err)
-		goto out;
-	sg_init_one(sg, header, hdrlen);
-	ahash_request_set_crypt(req, sg, NULL, hdrlen);
-	err = crypto_ahash_update(req);
-	if (err)
-		goto out;
-	err = xdr_process_buf(body, body_offset, body->len - body_offset,
-			      checksummer, req);
-	if (err)
-		goto out;
-	ahash_request_set_crypt(req, NULL, checksumdata, 0);
-	err = crypto_ahash_final(req);
-	if (err)
-		goto out;
-
-	switch (kctx->gk5e->ctype) {
-	case CKSUMTYPE_RSA_MD5:
-		err = krb5_encrypt(kctx->seq, NULL, checksumdata,
-				   checksumdata, checksumlen);
-		if (err)
-			goto out;
-		memcpy(cksumout->data,
-		       checksumdata + checksumlen - kctx->gk5e->cksumlength,
-		       kctx->gk5e->cksumlength);
-		break;
-	case CKSUMTYPE_HMAC_SHA1_DES3:
-		memcpy(cksumout->data, checksumdata, kctx->gk5e->cksumlength);
-		break;
-	default:
-		BUG();
-		break;
-	}
-	cksumout->len = kctx->gk5e->cksumlength;
-out:
-	ahash_request_free(req);
-out_free_ahash:
-	crypto_free_ahash(tfm);
-out_free_cksum:
-	kfree(checksumdata);
-	return err ? GSS_S_FAILURE : 0;
-}
-
 /**
  * gss_krb5_checksum - Compute the MAC for a GSS Wrap or MIC token
  * @tfm: an initialized hash transform

net/sunrpc/auth_gss/gss_krb5_internal.h

@@ -155,10 +155,6 @@ static inline int krb5_derive_key(struct krb5_ctx *kctx,
 
 void krb5_make_confounder(u8 *p, int conflen);
 
-u32 make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
-		  struct xdr_buf *body, int body_offset, u8 *cksumkey,
-		  unsigned int usage, struct xdr_netobj *cksumout);
-
 u32 gss_krb5_checksum(struct crypto_ahash *tfm, char *header, int hdrlen,
 		      const struct xdr_buf *body, int body_offset,
 		      struct xdr_netobj *cksumout);