Re-add |BN_bn2mpi| and |BN_mpi2bn| from OpenSSL at fd682e4c.
This benefits mainly M2Crypto.
Change-Id: I29bd0fa31b218760055ba467673f3882e46010c7
Reviewed-on: https://boringssl-review.googlesource.com/5722
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/bn/bn_test.cc b/crypto/bn/bn_test.cc
index e1588f7..74299c5 100644
--- a/crypto/bn/bn_test.cc
+++ b/crypto/bn/bn_test.cc
@@ -82,6 +82,7 @@
#include <openssl/mem.h>
#include "../crypto/test/scoped_types.h"
+#include "../crypto/test/test_util.h"
// This program tests the BIGNUM implementation. It takes an optional -bc
@@ -121,6 +122,7 @@
static bool test_dec2bn(BN_CTX *ctx);
static bool test_hex2bn(BN_CTX *ctx);
static bool test_asc2bn(BN_CTX *ctx);
+static bool test_mpi();
static bool test_rand();
static bool test_asn1();
@@ -316,6 +318,7 @@
!test_dec2bn(ctx.get()) ||
!test_hex2bn(ctx.get()) ||
!test_asc2bn(ctx.get()) ||
+ !test_mpi() ||
!test_rand() ||
!test_asn1()) {
return 1;
@@ -1582,6 +1585,63 @@
return true;
}
+struct MPITest {
+ const char *base10;
+ const char *mpi;
+ size_t mpi_len;
+};
+
+static const MPITest kMPITests[] = {
+ { "0", "\x00\x00\x00\x00", 4 },
+ { "1", "\x00\x00\x00\x01\x01", 5 },
+ { "-1", "\x00\x00\x00\x01\x81", 5 },
+ { "128", "\x00\x00\x00\x02\x00\x80", 6 },
+ { "256", "\x00\x00\x00\x02\x01\x00", 6 },
+ { "-256", "\x00\x00\x00\x02\x81\x00", 6 },
+};
+
+static bool test_mpi() {
+ uint8_t scratch[8];
+
+ for (size_t i = 0; i < sizeof(kMPITests) / sizeof(kMPITests[0]); i++) {
+ const MPITest &test = kMPITests[i];
+ ScopedBIGNUM bn(ASCIIToBIGNUM(test.base10));
+ const size_t mpi_len = BN_bn2mpi(bn.get(), NULL);
+ if (mpi_len > sizeof(scratch)) {
+ fprintf(stderr, "MPI test #%u: MPI size is too large to test.\n",
+ (unsigned)i);
+ return false;
+ }
+
+ const size_t mpi_len2 = BN_bn2mpi(bn.get(), scratch);
+ if (mpi_len != mpi_len2) {
+ fprintf(stderr, "MPI test #%u: length changes.\n", (unsigned)i);
+ return false;
+ }
+
+ if (mpi_len != test.mpi_len ||
+ memcmp(test.mpi, scratch, mpi_len) != 0) {
+ fprintf(stderr, "MPI test #%u failed:\n", (unsigned)i);
+ hexdump(stderr, "Expected: ", test.mpi, test.mpi_len);
+ hexdump(stderr, "Got: ", scratch, mpi_len);
+ return false;
+ }
+
+ ScopedBIGNUM bn2(BN_mpi2bn(scratch, mpi_len, NULL));
+ if (bn2.get() == nullptr) {
+ fprintf(stderr, "MPI test #%u: failed to parse\n", (unsigned)i);
+ return false;
+ }
+
+ if (BN_cmp(bn.get(), bn2.get()) != 0) {
+ fprintf(stderr, "MPI test #%u: wrong result\n", (unsigned)i);
+ return false;
+ }
+ }
+
+ return true;
+}
+
static bool test_rand() {
ScopedBIGNUM bn(BN_new());
if (!bn) {
