X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fecdsa%2Fecdsatest.c;h=22c00a7df42cf4716f0392c407c150d3dc14aad1;hp=d5245344484ffd31b00fb8e89ab4f5885f73d259;hb=8fa397a6bc54444f3b59fb5aac391279a53a9988;hpb=b3310161249a848a5243952467a1f3927ad78bfa diff --git a/crypto/ecdsa/ecdsatest.c b/crypto/ecdsa/ecdsatest.c index d524534448..22c00a7df4 100644 --- a/crypto/ecdsa/ecdsatest.c +++ b/crypto/ecdsa/ecdsatest.c @@ -137,7 +137,7 @@ int restore_rand(void) return 1; } -static int fbytes_counter = 0; +static int fbytes_counter = 0, use_fake = 0; static const char *numbers[8] = { "651056770906015076056810763456358567190100156695615665659", "6140507067065001063065065565667405560006161556565665656654", @@ -157,6 +157,11 @@ int fbytes(unsigned char *buf, int num) int ret; BIGNUM *tmp = NULL; + if (use_fake == 0) + return old_rand->bytes(buf, num); + + use_fake = 0; + if (fbytes_counter >= 8) return 0; tmp = BN_new(); @@ -168,10 +173,9 @@ int fbytes(unsigned char *buf, int num) return 0; } fbytes_counter ++; - ret = BN_bn2bin(tmp, buf); - if (ret == 0 || ret != num) + if (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf)) ret = 0; - else + else ret = 1; if (tmp) BN_free(tmp); @@ -192,19 +196,22 @@ int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in) EVP_MD_CTX_init(&md_ctx); /* get the message digest */ - EVP_DigestInit(&md_ctx, EVP_ecdsa()); - EVP_DigestUpdate(&md_ctx, (const void*)message, 3); - EVP_DigestFinal(&md_ctx, digest, &dgst_len); + if (!EVP_DigestInit(&md_ctx, EVP_ecdsa()) + || !EVP_DigestUpdate(&md_ctx, (const void*)message, 3) + || !EVP_DigestFinal(&md_ctx, digest, &dgst_len)) + goto x962_int_err; BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid)); /* create the key */ if ((key = EC_KEY_new_by_curve_name(nid)) == NULL) goto x962_int_err; + use_fake = 1; if (!EC_KEY_generate_key(key)) goto x962_int_err; BIO_printf(out, "."); (void)BIO_flush(out); /* create the signature */ + use_fake = 1; signature = ECDSA_do_sign(digest, 20, key); if (signature == NULL) goto x962_int_err; @@ -288,9 +295,13 @@ int test_builtin(BIO *out) size_t crv_len = 0, n = 0; EC_KEY *eckey = NULL, *wrong_eckey = NULL; EC_GROUP *group; + ECDSA_SIG *ecdsa_sig = NULL; unsigned char digest[20], wrong_digest[20]; - unsigned char *signature = NULL; - unsigned int sig_len; + unsigned char *signature = NULL; + const unsigned char *sig_ptr; + unsigned char *sig_ptr2; + unsigned char *raw_buf = NULL; + unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; int nid, ret = 0; /* fill digest values with some random data */ @@ -340,7 +351,8 @@ int test_builtin(BIO *out) if (EC_KEY_set_group(eckey, group) == 0) goto builtin_err; EC_GROUP_free(group); - if (EC_GROUP_get_degree(EC_KEY_get0_group(eckey)) < 160) + degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); + if (degree < 160) /* drop the curve */ { EC_KEY_free(eckey); @@ -416,26 +428,89 @@ int test_builtin(BIO *out) } BIO_printf(out, "."); (void)BIO_flush(out); - /* modify a single byte of the signature */ - offset = signature[10] % sig_len; - dirt = signature[11]; - signature[offset] ^= dirt ? dirt : 1; + /* wrong length */ + if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, + eckey) == 1) + { + BIO_printf(out, " failed\n"); + goto builtin_err; + } + BIO_printf(out, "."); + (void)BIO_flush(out); + + /* Modify a single byte of the signature: to ensure we don't + * garble the ASN1 structure, we read the raw signature and + * modify a byte in one of the bignums directly. */ + sig_ptr = signature; + if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) + { + BIO_printf(out, " failed\n"); + goto builtin_err; + } + + /* Store the two BIGNUMs in raw_buf. */ + r_len = BN_num_bytes(ecdsa_sig->r); + s_len = BN_num_bytes(ecdsa_sig->s); + bn_len = (degree + 7) / 8; + if ((r_len > bn_len) || (s_len > bn_len)) + { + BIO_printf(out, " failed\n"); + goto builtin_err; + } + buf_len = 2 * bn_len; + if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL) + goto builtin_err; + /* Pad the bignums with leading zeroes. */ + memset(raw_buf, 0, buf_len); + BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); + BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); + + /* Modify a single byte in the buffer. */ + offset = raw_buf[10] % buf_len; + dirt = raw_buf[11] ? raw_buf[11] : 1; + raw_buf[offset] ^= dirt; + /* Now read the BIGNUMs back in from raw_buf. */ + if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || + (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) + goto builtin_err; + + sig_ptr2 = signature; + sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) { BIO_printf(out, " failed\n"); goto builtin_err; } + /* Sanity check: undo the modification and verify signature. */ + raw_buf[offset] ^= dirt; + if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || + (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) + goto builtin_err; + + sig_ptr2 = signature; + sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); + if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) + { + BIO_printf(out, " failed\n"); + goto builtin_err; + } BIO_printf(out, "."); (void)BIO_flush(out); BIO_printf(out, " ok\n"); /* cleanup */ + /* clean bogus errors */ + ERR_clear_error(); OPENSSL_free(signature); signature = NULL; EC_KEY_free(eckey); eckey = NULL; EC_KEY_free(wrong_eckey); wrong_eckey = NULL; + ECDSA_SIG_free(ecdsa_sig); + ecdsa_sig = NULL; + OPENSSL_free(raw_buf); + raw_buf = NULL; } ret = 1; @@ -444,8 +519,12 @@ builtin_err: EC_KEY_free(eckey); if (wrong_eckey) EC_KEY_free(wrong_eckey); + if (ecdsa_sig) + ECDSA_SIG_free(ecdsa_sig); if (signature) OPENSSL_free(signature); + if (raw_buf) + OPENSSL_free(raw_buf); if (curves) OPENSSL_free(curves);