[CRYPTO] gcm: Fix ICV handling

The crypto_aead convention for ICVs is to include it directly in the
output.  If we decided to change this in future then we would make
the ICV (if the algorithm has an explicit one) available in the
request itself.

For now no algorithm needs this so this patch changes gcm to conform
to this convention.  It also adjusts the tcrypt aead tests to take
this into account.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 16 insertions, 28 deletions

diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index df93595..a6d4160 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -235,6 +235,7 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 	struct scatterlist asg[8];
 	const char *e;
 	struct tcrypt_result result;
+	unsigned int authsize;
 
 	if (enc == ENCRYPT)
 		e = "encryption";
@@ -265,6 +266,8 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 		return;
 	}
 
+	authsize = crypto_aead_authsize(tfm);
+
 	req = aead_request_alloc(tfm, GFP_KERNEL);
 	if (!req) {
 		printk(KERN_INFO "failed to allocate request for %s\n", algo);
@@ -296,7 +299,7 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 			}
 
 			sg_init_one(&sg[0], aead_tv[i].input,
-				    aead_tv[i].ilen);
+				    aead_tv[i].ilen + (enc ? authsize : 0));
 
 			sg_init_one(&asg[0], aead_tv[i].assoc,
 				    aead_tv[i].alen);
@@ -307,13 +310,9 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 
 			aead_request_set_assoc(req, asg, aead_tv[i].alen);
 
-			if (enc) {
-				ret = crypto_aead_encrypt(req);
-			} else {
-				memcpy(req->__ctx, aead_tv[i].tag,
-				       aead_tv[i].tlen);
-				ret = crypto_aead_decrypt(req);
-			}
+			ret = enc ?
+				crypto_aead_encrypt(req) :
+				crypto_aead_decrypt(req);
 
 			switch (ret) {
 			case 0:
@@ -335,16 +334,10 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 
 			q = kmap(sg_page(&sg[0])) + sg[0].offset;
 			hexdump(q, aead_tv[i].rlen);
-			printk(KERN_INFO "auth tag: ");
-			hexdump((unsigned char *)req->__ctx, aead_tv[i].tlen);
 
 			printk(KERN_INFO "enc/dec: %s\n",
 			       memcmp(q, aead_tv[i].result,
 				      aead_tv[i].rlen) ? "fail" : "pass");
-
-			printk(KERN_INFO "auth tag: %s\n",
-			       memcmp(req->__ctx, aead_tv[i].tag,
-				      aead_tv[i].tlen) ? "fail" : "pass");
 		}
 	}
 
@@ -381,6 +374,9 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 					   aead_tv[i].tap[k]);
 			}
 
+			if (enc)
+				sg[k - 1].length += authsize;
+
 			sg_init_table(asg, aead_tv[i].anp);
 			for (k = 0, temp = 0; k < aead_tv[i].anp; k++) {
 				memcpy(&axbuf[IDX[k]],
@@ -397,13 +393,9 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 
 			aead_request_set_assoc(req, asg, aead_tv[i].alen);
 
-			if (enc) {
-				ret = crypto_aead_encrypt(req);
-			} else {
-				memcpy(req->__ctx, aead_tv[i].tag,
-				       aead_tv[i].tlen);
-				ret = crypto_aead_decrypt(req);
-			}
+			ret = enc ?
+				crypto_aead_encrypt(req) :
+				crypto_aead_decrypt(req);
 
 			switch (ret) {
 			case 0:
@@ -429,17 +421,13 @@ static void test_aead(char *algo, int enc, struct aead_testvec *template,
 				hexdump(q, aead_tv[i].tap[k]);
 				printk(KERN_INFO "%s\n",
 				       memcmp(q, aead_tv[i].result + temp,
-					      aead_tv[i].tap[k]) ?
+					      aead_tv[i].tap[k] -
+					      (k < aead_tv[i].np - 1 || enc ?
+					       0 : authsize)) ?
 				       "fail" : "pass");
 
 				temp += aead_tv[i].tap[k];
 			}
-			printk(KERN_INFO "auth tag: ");
-			hexdump((unsigned char *)req->__ctx, aead_tv[i].tlen);
-
-			printk(KERN_INFO "auth tag: %s\n",
-			       memcmp(req->__ctx, aead_tv[i].tag,
-				      aead_tv[i].tlen) ? "fail" : "pass");
 		}
 	}