forked from rrcarlosr/Jetpack
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
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/*
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* Copyright (c) 2015 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Backport functionality introduced in Linux 4.2.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <crypto/scatterwalk.h>
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#include <crypto/aead.h>
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#include <linux/string.h>
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static struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
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struct scatterlist *src,
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unsigned int len)
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{
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for (;;) {
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if (!len)
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return src;
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if (src->length > len)
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break;
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len -= src->length;
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src = sg_next(src);
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}
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sg_init_table(dst, 2);
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sg_set_page(dst, sg_page(src), src->length - len, src->offset + len);
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scatterwalk_crypto_chain(dst, sg_next(src), 0, 2);
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return dst;
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}
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struct aead_old_request {
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struct scatterlist srcbuf[2];
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struct scatterlist dstbuf[2];
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struct aead_request subreq;
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};
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unsigned int crypto_aead_reqsize(struct crypto_aead *tfm)
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{
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return crypto_aead_crt(tfm)->reqsize + sizeof(struct aead_old_request);
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}
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EXPORT_SYMBOL_GPL(crypto_aead_reqsize);
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struct aead_request *crypto_backport_convert(struct aead_request *req)
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{
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struct aead_old_request *nreq = aead_request_ctx(req);
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct scatterlist *src, *dst;
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src = scatterwalk_ffwd(nreq->srcbuf, req->src, req->assoclen);
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dst = req->src == req->dst ?
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src : scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen);
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aead_request_set_tfm(&nreq->subreq, aead);
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aead_request_set_callback(&nreq->subreq, aead_request_flags(req),
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req->base.complete, req->base.data);
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aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen,
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req->iv);
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aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen);
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return &nreq->subreq;
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}
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EXPORT_SYMBOL_GPL(crypto_backport_convert);
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char *strreplace(char *s, char old, char new)
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{
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for (; *s; ++s)
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if (*s == old)
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*s = new;
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return s;
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}
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EXPORT_SYMBOL_GPL(strreplace);
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/**
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* sg_nents_for_len - return total count of entries in scatterlist
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* needed to satisfy the supplied length
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* @sg: The scatterlist
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* @len: The total required length
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*
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* Description:
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* Determines the number of entries in sg that are required to meet
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* the supplied length, taking into acount chaining as well
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*
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* Returns:
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* the number of sg entries needed, negative error on failure
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*
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**/
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int sg_nents_for_len(struct scatterlist *sg, u64 len)
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{
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int nents;
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u64 total;
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if (!len)
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return 0;
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for (nents = 0, total = 0; sg; sg = sg_next(sg)) {
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nents++;
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total += sg->length;
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if (total >= len)
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return nents;
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL(sg_nents_for_len);
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