49 gss_krb5_add_padding(struct xdr_buf *buf, int offset, int blocksize)  in gss_krb5_add_padding()  argument
51 	int padding = gss_krb5_padding(blocksize, buf->len - offset);  in gss_krb5_add_padding()
55 	if (buf->page_len || buf->tail[0].iov_len)  in gss_krb5_add_padding()
56 		iov = &buf->tail[0];  in gss_krb5_add_padding()
58 		iov = &buf->head[0];  in gss_krb5_add_padding()
61 	buf->len += padding;  in gss_krb5_add_padding()
66 gss_krb5_remove_padding(struct xdr_buf *buf, int blocksize)  in gss_krb5_remove_padding()  argument
70 	size_t len = buf->len;  in gss_krb5_remove_padding()
72 	if (len <= buf->head[0].iov_len) {  in gss_krb5_remove_padding()
73 		pad = *(u8 *)(buf->head[0].iov_base + len - 1);  in gss_krb5_remove_padding()
74 		if (pad > buf->head[0].iov_len)  in gss_krb5_remove_padding()
76 		buf->head[0].iov_len -= pad;  in gss_krb5_remove_padding()
79 		len -= buf->head[0].iov_len;  in gss_krb5_remove_padding()
80 	if (len <= buf->page_len) {  in gss_krb5_remove_padding()
81 		unsigned int last = (buf->page_base + len - 1)  in gss_krb5_remove_padding()
83 		unsigned int offset = (buf->page_base + len - 1)  in gss_krb5_remove_padding()
85 		ptr = kmap_atomic(buf->pages[last]);  in gss_krb5_remove_padding()
90 		len -= buf->page_len;  in gss_krb5_remove_padding()
91 	BUG_ON(len > buf->tail[0].iov_len);  in gss_krb5_remove_padding()
92 	pad = *(u8 *)(buf->tail[0].iov_base + len - 1);  in gss_krb5_remove_padding()
109 	if (buf->len > pad)  in gss_krb5_remove_padding()
110 		buf->len -= pad;  in gss_krb5_remove_padding()
159 		struct xdr_buf *buf, struct page **pages)  in gss_wrap_kerberos_v1()  argument
178 	gss_krb5_add_padding(buf, offset, blocksize);  in gss_wrap_kerberos_v1()
179 	BUG_ON((buf->len - offset) % blocksize);  in gss_wrap_kerberos_v1()
180 	plainlen = conflen + buf->len - offset;  in gss_wrap_kerberos_v1()
184 		(buf->len - offset);  in gss_wrap_kerberos_v1()
186 	ptr = buf->head[0].iov_base + offset;  in gss_wrap_kerberos_v1()
188 	xdr_extend_head(buf, offset, headlen);  in gss_wrap_kerberos_v1()
191 	BUG_ON((buf->len - offset - headlen) % blocksize);  in gss_wrap_kerberos_v1()
222 	tmp_pages = buf->pages;  in gss_wrap_kerberos_v1()
223 	buf->pages = pages;  in gss_wrap_kerberos_v1()
224 	if (make_checksum(kctx, ptr, 8, buf, offset + headlen - conflen,  in gss_wrap_kerberos_v1()
227 	buf->pages = tmp_pages;  in gss_wrap_kerberos_v1()
251 		err = gss_encrypt_xdr_buf(cipher, buf,  in gss_wrap_kerberos_v1()
257 		if (gss_encrypt_xdr_buf(kctx->enc, buf,  in gss_wrap_kerberos_v1()
266 gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)  in gss_unwrap_kerberos_v1()  argument
287 	ptr = (u8 *)buf->head[0].iov_base + offset;  in gss_unwrap_kerberos_v1()
289 					buf->len - offset))  in gss_unwrap_kerberos_v1()
316 					(unsigned char *)buf->head[0].iov_base;  in gss_unwrap_kerberos_v1()
340 		err = gss_decrypt_xdr_buf(cipher, buf, crypt_offset);  in gss_unwrap_kerberos_v1()
345 		if (gss_decrypt_xdr_buf(kctx->enc, buf, crypt_offset))  in gss_unwrap_kerberos_v1()
354 	if (make_checksum(kctx, ptr, 8, buf, crypt_offset,  in gss_unwrap_kerberos_v1()
377 	orig_start = buf->head[0].iov_base + offset;  in gss_unwrap_kerberos_v1()
378 	data_len = (buf->head[0].iov_base + buf->head[0].iov_len) - data_start;  in gss_unwrap_kerberos_v1()
380 	buf->head[0].iov_len -= (data_start - orig_start);  in gss_unwrap_kerberos_v1()
381 	buf->len -= (data_start - orig_start);  in gss_unwrap_kerberos_v1()
383 	if (gss_krb5_remove_padding(buf, blocksize))  in gss_unwrap_kerberos_v1()
401 static void rotate_buf_a_little(struct xdr_buf *buf, unsigned int shift)  in rotate_buf_a_little()  argument
409 	read_bytes_from_xdr_buf(buf, 0, head, shift);  in rotate_buf_a_little()
410 	for (i = 0; i + shift < buf->len; i += LOCAL_BUF_LEN) {  in rotate_buf_a_little()
411 		this_len = min(LOCAL_BUF_LEN, buf->len - (i + shift));  in rotate_buf_a_little()
412 		read_bytes_from_xdr_buf(buf, i+shift, tmp, this_len);  in rotate_buf_a_little()
413 		write_bytes_to_xdr_buf(buf, i, tmp, this_len);  in rotate_buf_a_little()
415 	write_bytes_to_xdr_buf(buf, buf->len - shift, head, shift);  in rotate_buf_a_little()
418 static void _rotate_left(struct xdr_buf *buf, unsigned int shift)  in _rotate_left()  argument
423 	shift %= buf->len;  in _rotate_left()
426 		rotate_buf_a_little(buf, this_shift);  in _rotate_left()
431 static void rotate_left(u32 base, struct xdr_buf *buf, unsigned int shift)  in rotate_left()  argument
435 	xdr_buf_subsegment(buf, &subbuf, base, buf->len - base);  in rotate_left()
441 		     struct xdr_buf *buf, struct page **pages)  in gss_wrap_kerberos_v2()  argument
457 	if (xdr_extend_head(buf, offset, GSS_KRB5_TOK_HDR_LEN))  in gss_wrap_kerberos_v2()
461 	ptr = plainhdr = buf->head[0].iov_base + offset;  in gss_wrap_kerberos_v2()
486 	err = (*kctx->gk5e->encrypt_v2)(kctx, offset, buf, pages);  in gss_wrap_kerberos_v2()
495 gss_unwrap_kerberos_v2(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)  in gss_unwrap_kerberos_v2()  argument
512 	ptr = buf->head[0].iov_base + offset;  in gss_unwrap_kerberos_v2()
539 		rotate_left(offset + 16, buf, rrc);  in gss_unwrap_kerberos_v2()
541 	err = (*kctx->gk5e->decrypt_v2)(kctx, offset, buf,  in gss_unwrap_kerberos_v2()
550 	err = read_bytes_from_xdr_buf(buf,  in gss_unwrap_kerberos_v2()
551 				buf->len - GSS_KRB5_TOK_HDR_LEN - tailskip,  in gss_unwrap_kerberos_v2()
577 	movelen = min_t(unsigned int, buf->head[0].iov_len, buf->len);  in gss_unwrap_kerberos_v2()
580 							buf->head[0].iov_len);  in gss_unwrap_kerberos_v2()
582 	buf->head[0].iov_len -= GSS_KRB5_TOK_HDR_LEN + headskip;  in gss_unwrap_kerberos_v2()
583 	buf->len -= GSS_KRB5_TOK_HDR_LEN + headskip;  in gss_unwrap_kerberos_v2()
586 	xdr_buf_trim(buf, ec + GSS_KRB5_TOK_HDR_LEN + tailskip);  in gss_unwrap_kerberos_v2()
592 		  struct xdr_buf *buf, struct page **pages)  in gss_wrap_kerberos()  argument
602 		return gss_wrap_kerberos_v1(kctx, offset, buf, pages);  in gss_wrap_kerberos()
605 		return gss_wrap_kerberos_v2(kctx, offset, buf, pages);  in gss_wrap_kerberos()
610 gss_unwrap_kerberos(struct gss_ctx *gctx, int offset, struct xdr_buf *buf)  in gss_unwrap_kerberos()  argument
620 		return gss_unwrap_kerberos_v1(kctx, offset, buf);  in gss_unwrap_kerberos()
623 		return gss_unwrap_kerberos_v2(kctx, offset, buf);  in gss_unwrap_kerberos()