Move PKCS#12 samples to embed_test_data.

pkcs12_test.cc was getting a bit long. Along the way, embed_test_data.go
needed a fix to work around a syntax quirk of C++.

Change-Id: Ic4a19f77d177ebd607918feb253a08f1f9037981
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/46044
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

sources.cmake

@@ -59,6 +59,15 @@ set(
   crypto/fipsmodule/rand/ctrdrbg_vectors.txt
   crypto/hmac_extra/hmac_tests.txt
   crypto/hpke/hpke_test_vectors.txt
+  crypto/pkcs8/test/empty_password.p12
+  crypto/pkcs8/test/no_encryption.p12
+  crypto/pkcs8/test/nss.p12
+  crypto/pkcs8/test/null_password.p12
+  crypto/pkcs8/test/openssl.p12
+  crypto/pkcs8/test/pbes2_sha1.p12
+  crypto/pkcs8/test/pbes2_sha256.p12
+  crypto/pkcs8/test/unicode_password.p12
+  crypto/pkcs8/test/windows.p12
   crypto/poly1305/poly1305_tests.txt
   crypto/siphash/siphash_tests.txt
   crypto/x509/test/basic_constraints_ca.pem

util/embed_test_data.go

@@ -28,9 +28,11 @@ import (
 var fileList = flag.String("file-list", "", "if not empty, the path to a file containing a newline-separated list of files, to work around Windows command-line limits")
 
 func quote(in []byte) string {
+	var lastWasHex bool
 	var buf bytes.Buffer
 	buf.WriteByte('"')
 	for _, b := range in {
+		var wasHex bool
 		switch b {
 		case '\a':
 			buf.WriteString(`\a`)
@@ -51,13 +53,20 @@ func quote(in []byte) string {
 		case '\\':
 			buf.WriteString(`\\`)
 		default:
-			// printable ascii code [32, 126]
-			if 32 <= b && b <= 126 {
+			// Emit printable ASCII characters, [32, 126], as-is to minimize
+			// file size. However, if the previous character used a hex escape
+			// sequence, do not emit 0-9 and a-f as-is. C++ interprets "\x123"
+			// as a single (overflowing) escape sequence, rather than '\x12'
+			// followed by '3'.
+			isHexDigit := ('0' <= b && b <= '9') || ('a' <= b && b <= 'f') || ('A' <= b && b <= 'F')
+			if 32 <= b && b <= 126 && !(lastWasHex && isHexDigit) {
 				buf.WriteByte(b)
 			} else {
 				fmt.Fprintf(&buf, "\\x%02x", b)
+				wasHex = true
 			}
 		}
+		lastWasHex = wasHex
 	}
 	buf.WriteByte('"')
 	return buf.String()