crypto/aes: fix regression for ppc64x

CL 561080 introduced some failures for CBC and GCM crypto tests that are run during a build resulting in dashboard failures.

Tests that are failing:
- TestCBCEncrypterAES
- TestCBCDecrypterAES
- TestAESGCM
- TestGCMCounterWrap
- TestGCMAsm

This fixes those failures.

Change-Id: I90d6f8d279a3051cf951a1a9628afb8d0b5c2f17
Reviewed-on: https://go-review.googlesource.com/c/go/+/574076
Reviewed-by: Marten Seemann <martenseemann@gmail.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Eli Bendersky <eliben@google.com>
Auto-Submit: Than McIntosh <thanm@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

2 files changed, 4 insertions, 3 deletions

diff --git a/src/crypto/aes/cbc_ppc64x.go b/src/crypto/aes/cbc_ppc64x.go
index 2cb9606e58..d5b491e8e1 100644
--- a/src/crypto/aes/cbc_ppc64x.go
+++ b/src/crypto/aes/cbc_ppc64x.go
@@ -59,9 +59,9 @@ func (x *cbc) CryptBlocks(dst, src []byte) {
 	}
 	if len(src) > 0 {
 		if x.enc == cbcEncrypt {
-			cryptBlocksChain(&src[0], &dst[0], len(src), &x.b.enc[0], &x.iv[0], x.enc, len(x.b.enc)/4-1)
+			cryptBlocksChain(&src[0], &dst[0], len(src), &x.b.enc[0], &x.iv[0], x.enc, int(x.b.l)/4-1)
 		} else {
-			cryptBlocksChain(&src[0], &dst[0], len(src), &x.b.dec[0], &x.iv[0], x.enc, len(x.b.dec)/4-1)
+			cryptBlocksChain(&src[0], &dst[0], len(src), &x.b.dec[0], &x.iv[0], x.enc, int(x.b.l)/4-1)
 		}
 	}
 }
diff --git a/src/crypto/aes/gcm_ppc64x.go b/src/crypto/aes/gcm_ppc64x.go
index f206b47607..20b0eade0a 100644
--- a/src/crypto/aes/gcm_ppc64x.go
+++ b/src/crypto/aes/gcm_ppc64x.go
@@ -119,7 +119,8 @@ func (g *gcmAsm) deriveCounter(counter *[gcmBlockSize]byte, nonce []byte) {
 // counterCryptASM implements counterCrypt which then allows the loop to
 // be unrolled and optimized.
 func (g *gcmAsm) counterCrypt(out, in []byte, counter *[gcmBlockSize]byte) {
-	counterCryptASM(len(g.cipher.enc)/4-1, out, in, counter, &g.cipher.enc[0])
+	counterCryptASM(int(g.cipher.l)/4-1, out, in, counter, &g.cipher.enc[0])
+
 }
 
 // increments the rightmost 32-bits of the count value by 1.