skipjack never made it out of draft, it only has an 80bit key,

NIST recommends discontinuing it's use after 2010 and I proposed removing the cipher entirely, it also isn't supported by our setkey, and was never assigned an offical IANA number, so isn't able to interoperate w/ anyone... kill it..
jmgurney · Jul 27, 2015 · a357a33 · a357a33
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diff --git a/sys/net/pfkeyv2.h b/sys/net/pfkeyv2.h
@@ -370,7 +370,6 @@ struct sadb_x_nat_t_frag {
 #define SADB_X_EALG_CAMELLIACBC		22
 #define	SADB_X_EALG_AESGMAC		23 /* RFC4543 + Errata1821 */
 /* private allocations should use 249-255 (RFC2407) */
-#define SADB_X_EALG_SKIPJACK	249	/*250*/ /* for IPSEC */
 #define SADB_X_EALG_AESCTR	250	/*249*/ /* draft-ietf-ipsec-ciph-aes-ctr-03 */
 
 /* private allocations - based on RFC2407/IANA assignment */

diff --git a/sys/netipsec/xform_esp.c b/sys/netipsec/xform_esp.c
@@ -115,8 +115,6 @@ esp_algorithm_lookup(int alg)
 		return &enc_xform_blf;
 	case SADB_X_EALG_CAST128CBC:
 		return &enc_xform_cast5;
-	case SADB_X_EALG_SKIPJACK:
-		return &enc_xform_skipjack;
 	case SADB_EALG_NULL:
 		return &enc_xform_null;
 	case SADB_X_EALG_CAMELLIACBC: