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Generate IVs directly in esp_output.

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This is the only place that uses CRYPTO_F_IV_GENERATE.  All crypto
drivers currently duplicate the same boilerplate code to handle this
case.  Doing the generation directly removes complexity from drivers.
It also simplifies support for separate input and output buffers.

Reviewed by:	cem
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D24449
This commit is contained in:
John Baldwin 2020-04-20 22:20:26 +00:00
parent 5c94a87341
commit 8cbde41419
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=360135
1 changed files with 4 additions and 4 deletions
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8
sys/netipsec/xform_esp.c
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@ -813,10 +813,9 @@ esp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
crp->crp_payload_length = m->m_pkthdr.len - (skip + hlen + alen);
crp->crp_op = CRYPTO_OP_ENCRYPT;
/* Encryption operation. */
/* Generate IV / nonce. */
ivp = &crp->crp_iv[0];
if (SAV_ISCTRORGCM(sav)) {
ivp = &crp->crp_iv[0];
/* GCM IV Format: RFC4106 4 */
/* CTR IV Format: RFC3686 4 */
/* Salt is last four bytes of key, RFC4106 8.1 */
@ -833,8 +832,9 @@ esp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
m_copyback(m, skip + hlen - sav->ivlen, sav->ivlen, &ivp[4]);
crp->crp_flags |= CRYPTO_F_IV_SEPARATE;
} else if (sav->ivlen != 0) {
arc4rand(ivp, sav->ivlen, 0);
crp->crp_iv_start = skip + hlen - sav->ivlen;
crp->crp_flags |= CRYPTO_F_IV_GENERATE;
m_copyback(m, crp->crp_iv_start, sav->ivlen, ivp);
}
/* Callback parameters */