chacha20poly1305: test for authtag failure

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 21 insertions, 3 deletions

diff --git a/src/selftest/chacha20poly1305.h b/src/selftest/chacha20poly1305.h
index 894bd97..e9070ba 100644
--- a/src/selftest/chacha20poly1305.h
+++ b/src/selftest/chacha20poly1305.h
@@ -7,6 +7,7 @@
 struct chacha20poly1305_testvec {
 	u8 *key, *nonce, *assoc, *input, *result;
 	size_t nlen, alen, ilen;
+	bool failure;
 };
 
 /* The first of these are the ChaCha20-Poly1305 AEAD test vectors from RFC7539 2.8.2. After they
@@ -1250,6 +1251,16 @@ static const struct chacha20poly1305_testvec chacha20poly1305_dec_vectors[] __in
 	.input	= "\x52\x34\xb3\x65\x3b\xb7\xe5\xd3\xab\x49\x17\x60\xd2\x52\x56\xdf\xdf\x34\x56\x82\xe2\xbe\xe5\xe1\x28\xd1\x4e\x5f\x4f\x1\x7d\x3f\x99\x6b\x30\x6e\x1a\x7c\x4c\x8e\x62\x81\xae\x86\x3f\x6b\xd0\xb5\xa9\xcf\x50\xf1\x2\x12\xa0\xb\x24\xe9\xe6\x72\x89\x2c\x52\x1b\x34\x38\xf8\x75\x5f\xa0\x74\xe2\x99\xdd\xa6\x4b\x14\x50\x4e\xf1\xbe\xd6\x9e\xdb\xb2\x24\x27\x74\x12\x4a\x78\x78\x17\xa5\x58\x8e\x2f\xf9\xf4\x8d\xee\x3\x88\xae\xb8\x29\xa1\x2f\x4b\xee\x92\xbd\x87\xb3\xce\x34\x21\x57\x46\x4\x49\xc\x80\xf2\x1\x13\xa1\x55\xb3\xff\x44\x30\x3c\x1c\xd0\xef\xbc\x18\x74\x26\xad\x41\x5b\x5b\x3e\x9a\x7a\x46\x4f\x16\xd6\x74\x5a\xb7\x3a\x28\x31\xd8\xae\x26\xac\x50\x53\x86\xf2\x56\xd7\x3f\x29\xbc\x45\x68\x8e\xcb\x98\x64\xdd\xc9\xba\xb8\x4b\x7b\x82\xdd\x14\xa7\xcb\x71\x72\x0\x5c\xad\x7b\x6a\x89\xa4\x3d\xbf\xb5\x4b\x3e\x7c\x5a\xcf\xb8\xa1\xc5\x6e\xc8\xb6\x31\x57\x7b\xdf\xa5\x7e\xb1\xd6\x42\x2a\x31\x36\xd1\xd0\x3f\x7a\xe5\x94\xd6\x36\xa0\x6f\xb7\x40\x7d\x37\xc6\x55\x7c\x50\x40\x6d\x29\x89\xe3\x5a\xae\x97\xe7\x44\x49\x6e\xbd\x81\x3d\x3\x93\x6\x12\x6\xe2\x41\x12\x4a\xf1\x6a\xa4\x58\xa2\xfb\xd2\x15\xba\xc9\x79\xc9\xce\x5e\x13\xbb\xf1\x9\x4\xcc\xfd\xe8\x51\x34\x6a\xe8\x61\x88\xda\xed\x1\x47\x84\xf5\x73\x25\xf9\x1c\x42\x86\x7\xf3\x5b\x1a\x1\xb3\xeb\x24\x32\x8d\xf6\xed\x7c\x4b\xeb\x3c\x36\x42\x28\xdf\xdf\xb6\xbe\xd9\x8c\x52\xd3\x2b\x8\x90\x8c\xe7\x98\x31\xe2\x32\x8e\xfc\x11\x48\x0\xa8\x6a\x42\x4a\x2\xc6\x4b\x9\xf1\xe3\x49\xf3\x45\x1f\xe\xbc\x56\xe2\xe4\xdf\xfb\xeb\x61\xfa\x24\xc1\x63\x75\xbb\x47\x75\xaf\xe1\x53\x16\x96\x21\x85\x26\x11\xb3\x76\xe3\x23\xa1\x6b\x74\x37\xd0\xde\x6\x90\x71\x5d\x43\x88\x9b\x0\x54\xa6\x75\x2f\xa1\xc2\xb\x73\x20\x1d\xb6\x21\x79\x57\x3f\xfa\x9\xbe\x8a\x33\xc3\x52\xf0\x1d\x82\x31\xd1\x55\xb5\x6c\x99\x25\xcf\x5c\x32\xce\xe9\xd\xfa\x69\x2c\xd5\xd\xc5\x6d\x86\xd0\xc\x3b\x6\x50\x79\xe8\xc3\xae\x4\xe6\xcd\x51\xe4\x26\x9b\x4f\x7e\xa6\xf\xab\xd8\xe5\xde\xa9\x0\x95\xbe\xa3\x9d\x5d\xb2\x9\x70\x18\x1c\xf0\xac\x29\x23\x2\x29\x28\xd2\x74\x35\x57\x62\xf\x24\xea\x5e\x33\xc2\x92\xf3\x78\x4d\x30\x1e\xa1\x99\xa9\x82\xb0\x42\x31\x8d\xad\x8a\xbc\xfc\xd4\x57\x47\x3e\xb4\x50\xdd\x6e\x2c\x80\x4d\x22\xf1\xfb\x57\xc4\xdd\x17\xe1\x8a\x36\x4a\xb3\x37\xca\xc9\x4e\xab\xd5\x69\xc4\xf4\xbc\xb\x3b\x44\x4b\x29\x9c\xee\xd4\x35\x22\x21\xb0\x1f\x27\x64\xa8\x51\x1b\xf0\x9f\x19\x5c\xfb\x5a\x64\x74\x70\x45\x9\xf5\x64\xfe\x1a\x2d\xc9\x14\x4\x14\xcf\xd5\x7d\x60\xaf\x94\x39\x94\xe2\x7d\x79\x82\xd0\x65\x3b\x6b\x9c\x19\x84\xb4\x6d\xb3\xc\x99\xc0\x56\xa8\xbd\x73\xce\x5\x84\x3e\x30\xaa\xc4\x9b\x1b\x4\x2a\x9f\xd7\x43\x2b\x23\xdf\xbf\xaa\xd5\xc2\x43\x2d\x70\xab\xdc\x75\xad\xac\xf7\xc0\xbe\x67\xb2\x74\xed\x67\x10\x4a\x92\x60\xc1\x40\x50\x19\x8a\x8a\x8c\x9\xe\x72\xe1\x73\x5e\xe8\x41\x85\x63\x9f\x3f\xd7\x7d\xc4\xfb\x22\x5d\x92\x6c\xb3\x1e\xe2\x50\x2f\x82\xa8\x28\xc0\xb5\xd7\x5f\x68\xd\x2c\x2d\xaf\x7e\xfa\x2e\x8\xf\x1f\x70\x9f\xe9\x19\x72\x55\xf8\xfb\x51\xd2\x33\x5d\xa0\xd3\x2b\xa\x6c\xbc\x4e\xcf\x36\x4d\xdc\x3b\xe9\x3e\x81\x7c\x61\xdb\x20\x2d\x3a\xc3\xb3\xc\x1e\x0\xb9\x7c\xf5\xca\x10\x5f\x3a\x71\xb3\xe4\x20\xdb\xc\x2a\x98\x63\x45\x0\x58\xf6\x68\xe4\xb\xda\x13\x3b\x60\x5c\x76\xdb\xb9\x97\x71\xe4\xd9\xb7\xdb\xbd\x68\xc7\x84\x84\xaa\x7c\x68\x62\x5e\x16\xfc\xba\x72\xaa\x9a\xa9\xeb\x7c\x75\x47\x97\x7e\xad\xe2\xd9\x91\xe8\xe4\xa5\x31\xd7\x1\x8e\xa2\x11\x88\x95\xb9\xf2\x9b\xd3\x7f\x1b\x81\x22\xf7\x98\x60\xa\x64\xa6\xc1\xf6\x49\xc7\xe3\x7\x4d\x94\x7a\xcf\x6e\x68\xc\x1b\x3f\x6e\x2e\xee\x92\xfa\x52\xb3\x59\xf8\xf1\x8f\x6a\x66\xa3\x82\x76\x4a\x7\x1a\xc7\xdd\xf5\xda\x9c\x3c\x24\xbf\xfd\x42\xa1\x10\x64\x6a\xf\x89\xee\x36\xa5\xce\x99\x48\x6a\xf0\x9f\x9e\x69\xa4\x40\x20\xe9\x16\x15\xf7\xdb\x75\x2\xcb\xe9\x73\x8b\x3b\x49\x2f\xf0\xaf\x51\x6\x5c\xdf\x27\x27\x49\x6a\xd1\xcc\xc7\xb5\x63\xb5\xfc\xb8\x5c\x87\x7f\x84\xb4\xcc\x14\xa9\x53\xda\xa4\x56\xf8\xb6\x1b\xcc\x40\x27\x52\x6\x5a\x13\x81\xd7\x3a\xd4\x3b\xfb\x49\x65\x31\x33\xb2\xfa\xcd\xad\x58\x4e\x2b\xae\xd2\x20\xfb\x1a\x48\xb4\x3f\x9a\xd8\x7a\x35\x4a\xc8\xee\x88\x5e\x7\x66\x54\xb9\xec\x9f\xa3\xe3\xb9\x37\xaa\x49\x76\x31\xda\x74\x2d\x3c\xa4\x65\x10\x32\x38\xf0\xde\xd3\x99\x17\xaa\x71\xaa\x8f\xf\x8c\xaf\xa2\xf8\x5d\x64\xba\x1d\xa3\xef\x96\x73\xe8\xa1\x2\x8d\xc\x6d\xb8\x6\x90\xb8\x8\x56\x2c\xa7\x6\xc9\xc2\x38\xdb\x7c\x63\xb1\x57\x8e\xea\x7c\x79\xf3\x49\x1d\xfe\x9f\xf3\x6e\xb1\x1d\xba\x19\x80\x1a\xa\xd3\xb0\x26\x21\x40\xb1\x7c\xf9\x4d\x8d\x10\xc1\x7e\xf4\xf6\x3c\xa8\xfd\x7c\xa3\x92\xb2\xf\xaa\xcc\xa6\x11\xfe\x4\xe3\xd1\x7a\x32\x89\xdf\xd\xc4\x8f\x79\x6b\xca\x16\x7c\x6e\xf9\xad\xf\xf6\xfe\x27\xdb\xc4\x13\x70\xf1\x62\x1a\x4f\x79\x40\xc9\x9b\x8b\x21\xea\x84\xfa\xf5\xf1\x89\xce\xb7\x55\xa\x80\x39\x2f\x55\x36\x16\x9c\x7b\x8\xbd\x87\xd\xa5\x32\xf1\x52\x7c\xe8\x55\x60\x5b\xd7\x69\xe4\xfc\xfa\x12\x85\x96\xea\x50\x28\xab\x8a\xf7\xbb\xe\x53\x74\xca\xa6\x27\x9\xc2\xb5\xde\x18\x14\xd9\xea\xe5\x29\x1c\x40\x56\xcf\xd7\xae\x5\x3f\x65\xaf\x5\x73\xe2\x35\x96\x27\x7\x14\xc0\xad\x33\xf1\xdc\x44\x7a\x89\x17\x77\xd2\x9c\x58\x60\xf0\x3f\x7b\x2d\x2e\x57\x95\x54\x87\xed\xf2\xc7\x4c\xf0\xae\x56\x29\x19\x7d\x66\x4b\x9b\x83\x84\x42\x3b\x1\x25\x66\x8e\x2\xde\xb9\x83\x54\x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 	.ilen	= 2027,
 	.result	= 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+}, {
+	.key	= "\xb3\x35\x50\x3\x54\x2e\x40\x5e\x8f\x59\x8e\xc5\x90\xd5\x27\x2d\xba\x29\x2e\xcb\x1b\x70\x44\x1e\x65\x91\x6e\x2a\x79\x22\xda\x64",
+	.nonce	= "\x5\xa3\x93\xed\x30\xc5\xa2\x6",
+	.nlen	= 8,
+	.assoc	= "\xb1\x69\x83\x87\x30\xaa\x5d\xb8\x77\xe8\x21\xff\x6\x59\x35\xce\x75\xfe\x38\xef\xb8\x91\x43\x8c\xcf\x70\xdd\xa\x68\xbf\xd4\xbc\x16\x76\x99\x36\x1e\x58\x79\x5e\xd4\x29\xf7\x33\x93\x48\xdb\x5f\x1\xae\x9c\xb6\xe4\x88\x6d\x2b\x76\x75\xe0\xf3\x74\xe2\xc9",
+	.alen	= 63,
+	.input	= 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+	.ilen	= 2027,
+	.result	= 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+	.failure = true
 } };
 
 static const struct chacha20poly1305_testvec xchacha20poly1305_enc_vectors[] __initconst = { {
@@ -1313,6 +1324,13 @@ static inline void chacha20poly1305_selftest_encrypt(u8 *dst, const u8 *src, con
 		BUG();
 }
 
+static inline bool decryption_success(bool func_ret, bool expect_failure, int memcmp_result)
+{
+	if (expect_failure)
+		return !func_ret;
+	return func_ret && !memcmp_result;
+}
+
 enum { MAXIMUM_TEST_BUFFER_LEN = 3000 };
 
 bool __init chacha20poly1305_selftest(void)
@@ -1357,7 +1375,7 @@ bool __init chacha20poly1305_selftest(void)
 	for (i = 0; i < ARRAY_SIZE(chacha20poly1305_dec_vectors); ++i) {
 		memset(computed_result, 0, sizeof(computed_result));
 		ret = chacha20poly1305_decrypt(computed_result, chacha20poly1305_dec_vectors[i].input, chacha20poly1305_dec_vectors[i].ilen, chacha20poly1305_dec_vectors[i].assoc, chacha20poly1305_dec_vectors[i].alen, le64_to_cpu(*(__force __le64 *)chacha20poly1305_dec_vectors[i].nonce), chacha20poly1305_dec_vectors[i].key);
-		if (!ret || memcmp(computed_result, chacha20poly1305_dec_vectors[i].result, chacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE)) {
+		if (!decryption_success(ret, chacha20poly1305_dec_vectors[i].failure, memcmp(computed_result, chacha20poly1305_dec_vectors[i].result, chacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE))) {
 			pr_info("chacha20poly1305 decryption self-test %zu: FAIL\n", i + 1);
 			success = false;
 		}
@@ -1369,7 +1387,7 @@ bool __init chacha20poly1305_selftest(void)
 		sg_init_one(&sg_src, heap_src, chacha20poly1305_dec_vectors[i].ilen);
 		sg_init_one(&sg_dst, heap_dst, chacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE);
 		ret = chacha20poly1305_decrypt_sg(&sg_dst, &sg_src, chacha20poly1305_dec_vectors[i].ilen, chacha20poly1305_dec_vectors[i].assoc, chacha20poly1305_dec_vectors[i].alen, le64_to_cpup((__force __le64 *)chacha20poly1305_dec_vectors[i].nonce), chacha20poly1305_dec_vectors[i].key, have_simd);
-		if (!ret || memcmp(heap_dst, chacha20poly1305_dec_vectors[i].result, chacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE)) {
+		if (!decryption_success(ret, chacha20poly1305_dec_vectors[i].failure, memcmp(heap_dst, chacha20poly1305_dec_vectors[i].result, chacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE))) {
 			pr_info("chacha20poly1305 sg decryption self-test %zu: FAIL\n", i + 1);
 			success = false;
 		}
@@ -1386,7 +1404,7 @@ bool __init chacha20poly1305_selftest(void)
 	for (i = 0; i < ARRAY_SIZE(xchacha20poly1305_dec_vectors); ++i) {
 		memset(computed_result, 0, sizeof(computed_result));
 		ret = xchacha20poly1305_decrypt(computed_result, xchacha20poly1305_dec_vectors[i].input, xchacha20poly1305_dec_vectors[i].ilen, xchacha20poly1305_dec_vectors[i].assoc, xchacha20poly1305_dec_vectors[i].alen, xchacha20poly1305_dec_vectors[i].nonce, xchacha20poly1305_dec_vectors[i].key);
-		if (!ret || memcmp(computed_result, xchacha20poly1305_dec_vectors[i].result, xchacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE)) {
+		if (!decryption_success(ret, xchacha20poly1305_dec_vectors[i].failure, memcmp(computed_result, xchacha20poly1305_dec_vectors[i].result, xchacha20poly1305_dec_vectors[i].ilen - POLY1305_MAC_SIZE))) {
 			pr_info("xchacha20poly1305 decryption self-test %zu: FAIL\n", i + 1);
 			success = false;
 		}