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https://github.com/QuasarApp/openssl.git
synced 2025-04-28 10:44:38 +00:00
Fix explicit EC curve encoding.
Per SEC 1, the curve coefficients must be padded up to size. See C.2's definition of Curve, C.1's definition of FieldElement, and 2.3.5's definition of how to encode the field elements in http://www.secg.org/sec1-v2.pdf. This comes up for P-521, where b needs a leading zero. Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6314)
This commit is contained in:
David Benjamin
parent
55a6250f1e
commit
fc6f579a9e
@ -367,10 +367,8 @@ static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
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{
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int ok = 0, nid;
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BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
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unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
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*a_buf = NULL, *b_buf = NULL;
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size_t len_1, len_2;
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unsigned char char_zero = 0;
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unsigned char *a_buf = NULL, *b_buf = NULL;
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size_t len;
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if (!group || !curve || !curve->a || !curve->b)
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return 0;
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@ -398,44 +396,26 @@ static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
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}
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}
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#endif
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len_1 = (size_t)BN_num_bytes(tmp_1);
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len_2 = (size_t)BN_num_bytes(tmp_2);
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if (len_1 == 0) {
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/* len_1 == 0 => a == 0 */
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a_buf = &char_zero;
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len_1 = 1;
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} else {
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if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
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goto err;
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}
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a_buf = buffer_1;
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/*
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* Per SEC 1, the curve coefficients must be padded up to size. See C.2's
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* definition of Curve, C.1's definition of FieldElement, and 2.3.5's
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* definition of how to encode the field elements.
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*/
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len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
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if ((a_buf = OPENSSL_malloc(len)) == NULL
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|| (b_buf = OPENSSL_malloc(len)) == NULL) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (len_2 == 0) {
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/* len_2 == 0 => b == 0 */
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b_buf = &char_zero;
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len_2 = 1;
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} else {
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if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
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goto err;
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}
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b_buf = buffer_2;
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if (BN_bn2binpad(tmp_1, a_buf, len) < 0
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|| BN_bn2binpad(tmp_2, b_buf, len) < 0) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
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goto err;
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}
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/* set a and b */
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if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
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!ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
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if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
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|| !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
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ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
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goto err;
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}
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@ -462,8 +442,8 @@ static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
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ok = 1;
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err:
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OPENSSL_free(buffer_1);
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OPENSSL_free(buffer_2);
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OPENSSL_free(a_buf);
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OPENSSL_free(b_buf);
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BN_free(tmp_1);
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BN_free(tmp_2);
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return ok;
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@ -611,7 +591,12 @@ EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
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goto err;
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}
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/* now extract the curve parameters a and b */
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/*
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* Now extract the curve parameters a and b. Note that, although SEC 1
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* specifies the length of their encodings, historical versions of OpenSSL
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* encoded them incorrectly, so we must accept any length for backwards
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* compatibility.
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*/
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if (!params->curve || !params->curve->a ||
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!params->curve->a->data || !params->curve->b ||
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!params->curve->b->data) {
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@ -1407,20 +1407,91 @@ err:
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}
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# endif
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static const unsigned char p521_named[] = {
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0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x23,
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};
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static const unsigned char p521_explicit[] = {
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0x30, 0x82, 0x01, 0xc3, 0x02, 0x01, 0x01, 0x30, 0x4d, 0x06, 0x07, 0x2a,
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0x86, 0x48, 0xce, 0x3d, 0x01, 0x01, 0x02, 0x42, 0x01, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0x30, 0x81, 0x9f, 0x04, 0x42, 0x01, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xfc, 0x04, 0x42, 0x00, 0x51, 0x95, 0x3e, 0xb9, 0x61, 0x8e, 0x1c, 0x9a,
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0x1f, 0x92, 0x9a, 0x21, 0xa0, 0xb6, 0x85, 0x40, 0xee, 0xa2, 0xda, 0x72,
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0x5b, 0x99, 0xb3, 0x15, 0xf3, 0xb8, 0xb4, 0x89, 0x91, 0x8e, 0xf1, 0x09,
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0xe1, 0x56, 0x19, 0x39, 0x51, 0xec, 0x7e, 0x93, 0x7b, 0x16, 0x52, 0xc0,
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0xbd, 0x3b, 0xb1, 0xbf, 0x07, 0x35, 0x73, 0xdf, 0x88, 0x3d, 0x2c, 0x34,
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0xf1, 0xef, 0x45, 0x1f, 0xd4, 0x6b, 0x50, 0x3f, 0x00, 0x03, 0x15, 0x00,
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0xd0, 0x9e, 0x88, 0x00, 0x29, 0x1c, 0xb8, 0x53, 0x96, 0xcc, 0x67, 0x17,
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0x39, 0x32, 0x84, 0xaa, 0xa0, 0xda, 0x64, 0xba, 0x04, 0x81, 0x85, 0x04,
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0x00, 0xc6, 0x85, 0x8e, 0x06, 0xb7, 0x04, 0x04, 0xe9, 0xcd, 0x9e, 0x3e,
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0xcb, 0x66, 0x23, 0x95, 0xb4, 0x42, 0x9c, 0x64, 0x81, 0x39, 0x05, 0x3f,
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0xb5, 0x21, 0xf8, 0x28, 0xaf, 0x60, 0x6b, 0x4d, 0x3d, 0xba, 0xa1, 0x4b,
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0x5e, 0x77, 0xef, 0xe7, 0x59, 0x28, 0xfe, 0x1d, 0xc1, 0x27, 0xa2, 0xff,
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0xa8, 0xde, 0x33, 0x48, 0xb3, 0xc1, 0x85, 0x6a, 0x42, 0x9b, 0xf9, 0x7e,
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0x7e, 0x31, 0xc2, 0xe5, 0xbd, 0x66, 0x01, 0x18, 0x39, 0x29, 0x6a, 0x78,
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0x9a, 0x3b, 0xc0, 0x04, 0x5c, 0x8a, 0x5f, 0xb4, 0x2c, 0x7d, 0x1b, 0xd9,
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0x98, 0xf5, 0x44, 0x49, 0x57, 0x9b, 0x44, 0x68, 0x17, 0xaf, 0xbd, 0x17,
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0x27, 0x3e, 0x66, 0x2c, 0x97, 0xee, 0x72, 0x99, 0x5e, 0xf4, 0x26, 0x40,
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0xc5, 0x50, 0xb9, 0x01, 0x3f, 0xad, 0x07, 0x61, 0x35, 0x3c, 0x70, 0x86,
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0xa2, 0x72, 0xc2, 0x40, 0x88, 0xbe, 0x94, 0x76, 0x9f, 0xd1, 0x66, 0x50,
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0x02, 0x42, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfa,
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0x51, 0x86, 0x87, 0x83, 0xbf, 0x2f, 0x96, 0x6b, 0x7f, 0xcc, 0x01, 0x48,
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0xf7, 0x09, 0xa5, 0xd0, 0x3b, 0xb5, 0xc9, 0xb8, 0x89, 0x9c, 0x47, 0xae,
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0xbb, 0x6f, 0xb7, 0x1e, 0x91, 0x38, 0x64, 0x09, 0x02, 0x01, 0x01,
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};
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static int parameter_test(void)
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{
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EC_GROUP *group = NULL, *group2 = NULL;
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ECPARAMETERS *ecparameters = NULL;
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int r;
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unsigned char *buf = NULL;
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int r = 0, len;
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r = TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_secp112r1))
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&& TEST_ptr(ecparameters = EC_GROUP_get_ecparameters(group, NULL))
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&& TEST_ptr(group2 = EC_GROUP_new_from_ecparameters(ecparameters))
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&& TEST_int_eq(EC_GROUP_cmp(group, group2, NULL), 0);
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if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_secp112r1))
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|| !TEST_ptr(ecparameters = EC_GROUP_get_ecparameters(group, NULL))
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|| !TEST_ptr(group2 = EC_GROUP_new_from_ecparameters(ecparameters))
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|| !TEST_int_eq(EC_GROUP_cmp(group, group2, NULL), 0))
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goto err;
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EC_GROUP_free(group);
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group = NULL;
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/* Test the named curve encoding, which should be default. */
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if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_secp521r1))
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|| !TEST_true((len = i2d_ECPKParameters(group, &buf)) >= 0)
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|| !TEST_mem_eq(buf, len, p521_named, sizeof(p521_named)))
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goto err;
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OPENSSL_free(buf);
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buf = NULL;
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/*
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* Test the explicit encoding. P-521 requires correctly zero-padding the
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* curve coefficients.
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*/
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EC_GROUP_set_asn1_flag(group, OPENSSL_EC_EXPLICIT_CURVE);
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if (!TEST_true((len = i2d_ECPKParameters(group, &buf)) >= 0)
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|| !TEST_mem_eq(buf, len, p521_explicit, sizeof(p521_explicit)))
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goto err;
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r = 1;
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err:
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EC_GROUP_free(group);
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EC_GROUP_free(group2);
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ECPARAMETERS_free(ecparameters);
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OPENSSL_free(buf);
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return r;
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}
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#endif
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