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path: root/nss/lib/freebl/ecdecode.c
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Diffstat (limited to 'nss/lib/freebl/ecdecode.c')
-rw-r--r--nss/lib/freebl/ecdecode.c125
1 files changed, 42 insertions, 83 deletions
diff --git a/nss/lib/freebl/ecdecode.c b/nss/lib/freebl/ecdecode.c
index eda3f0c..54b3e11 100644
--- a/nss/lib/freebl/ecdecode.c
+++ b/nss/lib/freebl/ecdecode.c
@@ -22,57 +22,6 @@
if (SECSuccess != (rv = func)) \
goto cleanup
-/*
- * Initializes a SECItem from a hexadecimal string
- *
- * Warning: This function ignores leading 00's, so any leading 00's
- * in the hexadecimal string must be optional.
- */
-static SECItem *
-hexString2SECItem(PLArenaPool *arena, SECItem *item, const char *str)
-{
- int i = 0;
- int byteval = 0;
- int tmp = PORT_Strlen(str);
-
- PORT_Assert(arena);
- PORT_Assert(item);
-
- if ((tmp % 2) != 0)
- return NULL;
-
- /* skip leading 00's unless the hex string is "00" */
- while ((tmp > 2) && (str[0] == '0') && (str[1] == '0')) {
- str += 2;
- tmp -= 2;
- }
-
- item->data = (unsigned char *)PORT_ArenaAlloc(arena, tmp / 2);
- if (item->data == NULL)
- return NULL;
- item->len = tmp / 2;
-
- while (str[i]) {
- if ((str[i] >= '0') && (str[i] <= '9'))
- tmp = str[i] - '0';
- else if ((str[i] >= 'a') && (str[i] <= 'f'))
- tmp = str[i] - 'a' + 10;
- else if ((str[i] >= 'A') && (str[i] <= 'F'))
- tmp = str[i] - 'A' + 10;
- else
- return NULL;
-
- byteval = byteval * 16 + tmp;
- if ((i % 2) != 0) {
- item->data[i / 2] = byteval;
- byteval = 0;
- }
- i++;
- }
-
- return item;
-}
-
/* Copy all of the fields from srcParams into dstParams
*/
SECStatus
@@ -85,7 +34,6 @@ EC_CopyParams(PLArenaPool *arena, ECParams *dstParams,
dstParams->type = srcParams->type;
dstParams->fieldID.size = srcParams->fieldID.size;
dstParams->fieldID.type = srcParams->fieldID.type;
- dstParams->pointSize = srcParams->pointSize;
if (srcParams->fieldID.type == ec_field_GFp ||
srcParams->fieldID.type == ec_field_plain) {
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->fieldID.u.prime,
@@ -121,12 +69,10 @@ cleanup:
}
static SECStatus
-gf_populate_params(ECCurveName name, ECFieldType field_type, ECParams *params)
+gf_populate_params_bytes(ECCurveName name, ECFieldType field_type, ECParams *params)
{
SECStatus rv = SECFailure;
- const ECCurveParams *curveParams;
- /* 2 ['0'+'4'] + MAX_ECKEY_LEN * 2 [x,y] * 2 [hex string] + 1 ['\0'] */
- char genenc[3 + 2 * 2 * MAX_ECKEY_LEN];
+ const ECCurveBytes *curveParams;
if ((name < ECCurve_noName) || (name > ECCurve_pastLastCurve))
goto cleanup;
@@ -135,27 +81,19 @@ gf_populate_params(ECCurveName name, ECFieldType field_type, ECParams *params)
CHECK_OK(curveParams);
params->fieldID.size = curveParams->size;
params->fieldID.type = field_type;
- params->pointSize = curveParams->pointSize;
- if (field_type == ec_field_GFp ||
- field_type == ec_field_plain) {
- CHECK_OK(hexString2SECItem(params->arena, &params->fieldID.u.prime,
- curveParams->irr));
- } else {
- CHECK_OK(hexString2SECItem(params->arena, &params->fieldID.u.poly,
- curveParams->irr));
+ if (field_type != ec_field_GFp && field_type != ec_field_plain) {
+ return SECFailure;
}
- CHECK_OK(hexString2SECItem(params->arena, &params->curve.a,
- curveParams->curvea));
- CHECK_OK(hexString2SECItem(params->arena, &params->curve.b,
- curveParams->curveb));
- genenc[0] = '0';
- genenc[1] = '4';
- genenc[2] = '\0';
- strcat(genenc, curveParams->genx);
- strcat(genenc, curveParams->geny);
- CHECK_OK(hexString2SECItem(params->arena, &params->base, genenc));
- CHECK_OK(hexString2SECItem(params->arena, &params->order,
- curveParams->order));
+ params->fieldID.u.prime.len = curveParams->scalarSize;
+ params->fieldID.u.prime.data = (unsigned char *)curveParams->irr;
+ params->curve.a.len = curveParams->scalarSize;
+ params->curve.a.data = (unsigned char *)curveParams->curvea;
+ params->curve.b.len = curveParams->scalarSize;
+ params->curve.b.data = (unsigned char *)curveParams->curveb;
+ params->base.len = curveParams->pointSize;
+ params->base.data = (unsigned char *)curveParams->base;
+ params->order.len = curveParams->scalarSize;
+ params->order.data = (unsigned char *)curveParams->order;
params->cofactor = curveParams->cofactor;
rv = SECSuccess;
@@ -218,29 +156,30 @@ EC_FillParams(PLArenaPool *arena, const SECItem *encodedParams,
/* Populate params for prime256v1 aka secp256r1
* (the NIST P-256 curve)
*/
- CHECK_SEC_OK(gf_populate_params(ECCurve_X9_62_PRIME_256V1, ec_field_GFp,
- params));
+ CHECK_SEC_OK(gf_populate_params_bytes(ECCurve_X9_62_PRIME_256V1,
+ ec_field_GFp, params));
break;
case SEC_OID_SECG_EC_SECP384R1:
/* Populate params for secp384r1
* (the NIST P-384 curve)
*/
- CHECK_SEC_OK(gf_populate_params(ECCurve_SECG_PRIME_384R1, ec_field_GFp,
- params));
+ CHECK_SEC_OK(gf_populate_params_bytes(ECCurve_SECG_PRIME_384R1,
+ ec_field_GFp, params));
break;
case SEC_OID_SECG_EC_SECP521R1:
/* Populate params for secp521r1
* (the NIST P-521 curve)
*/
- CHECK_SEC_OK(gf_populate_params(ECCurve_SECG_PRIME_521R1, ec_field_GFp,
- params));
+ CHECK_SEC_OK(gf_populate_params_bytes(ECCurve_SECG_PRIME_521R1,
+ ec_field_GFp, params));
break;
case SEC_OID_CURVE25519:
/* Populate params for Curve25519 */
- CHECK_SEC_OK(gf_populate_params(ECCurve25519, ec_field_plain, params));
+ CHECK_SEC_OK(gf_populate_params_bytes(ECCurve25519, ec_field_plain,
+ params));
break;
default:
@@ -294,4 +233,24 @@ EC_DecodeParams(const SECItem *encodedParams, ECParams **ecparams)
}
}
+int
+EC_GetPointSize(const ECParams *params)
+{
+ ECCurveName name = params->name;
+ const ECCurveBytes *curveParams;
+
+ if ((name < ECCurve_noName) || (name > ECCurve_pastLastCurve) ||
+ ((curveParams = ecCurve_map[name]) == NULL)) {
+ /* unknown curve, calculate point size from params. assume standard curves with 2 points
+ * and a point compression indicator byte */
+ int sizeInBytes = (params->fieldID.size + 7) / 8;
+ return sizeInBytes * 2 + 1;
+ }
+ if (name == ECCurve25519) {
+ /* Only X here */
+ return curveParams->scalarSize;
+ }
+ return curveParams->pointSize - 1;
+}
+
#endif /* NSS_DISABLE_ECC */
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