static int asn1_ex_c2i()

in Sources/CCryptoBoringSSL/crypto/asn1/tasn_dec.c [744:869]

• 111 lines of code
• 44 McCabe index (conditional complexity)

static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
                       int utype, const ASN1_ITEM *it)
{
    ASN1_VALUE **opval = NULL;
    ASN1_STRING *stmp;
    ASN1_TYPE *typ = NULL;
    int ret = 0;
    ASN1_INTEGER **tint;

    /* Historically, |it->funcs| for primitive types contained an
     * |ASN1_PRIMITIVE_FUNCS| table of callbacks. */
    assert(it->funcs == NULL);

    /* If ANY type clear type and set pointer to internal value */
    if (it->utype == V_ASN1_ANY) {
        if (!*pval) {
            typ = ASN1_TYPE_new();
            if (typ == NULL)
                goto err;
            *pval = (ASN1_VALUE *)typ;
        } else
            typ = (ASN1_TYPE *)*pval;

        if (utype != typ->type)
            ASN1_TYPE_set(typ, utype, NULL);
        opval = pval;
        pval = &typ->value.asn1_value;
    }
    switch (utype) {
    case V_ASN1_OBJECT:
        if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
            goto err;
        break;

    case V_ASN1_NULL:
        if (len) {
            OPENSSL_PUT_ERROR(ASN1, ASN1_R_NULL_IS_WRONG_LENGTH);
            goto err;
        }
        *pval = (ASN1_VALUE *)1;
        break;

    case V_ASN1_BOOLEAN:
        if (len != 1) {
            OPENSSL_PUT_ERROR(ASN1, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
            goto err;
        } else {
            ASN1_BOOLEAN *tbool;
            tbool = (ASN1_BOOLEAN *)pval;
            *tbool = *cont;
        }
        break;

    case V_ASN1_BIT_STRING:
        if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
            goto err;
        break;

    case V_ASN1_INTEGER:
    case V_ASN1_ENUMERATED:
        tint = (ASN1_INTEGER **)pval;
        if (!c2i_ASN1_INTEGER(tint, &cont, len))
            goto err;
        /* Fixup type to match the expected form */
        (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
        break;

    case V_ASN1_OCTET_STRING:
    case V_ASN1_NUMERICSTRING:
    case V_ASN1_PRINTABLESTRING:
    case V_ASN1_T61STRING:
    case V_ASN1_VIDEOTEXSTRING:
    case V_ASN1_IA5STRING:
    case V_ASN1_UTCTIME:
    case V_ASN1_GENERALIZEDTIME:
    case V_ASN1_GRAPHICSTRING:
    case V_ASN1_VISIBLESTRING:
    case V_ASN1_GENERALSTRING:
    case V_ASN1_UNIVERSALSTRING:
    case V_ASN1_BMPSTRING:
    case V_ASN1_UTF8STRING:
    case V_ASN1_OTHER:
    case V_ASN1_SET:
    case V_ASN1_SEQUENCE:
    default:
        if (utype == V_ASN1_BMPSTRING && (len & 1)) {
            OPENSSL_PUT_ERROR(ASN1, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
            goto err;
        }
        if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
            OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
            goto err;
        }
        /* All based on ASN1_STRING and handled the same */
        if (!*pval) {
            stmp = ASN1_STRING_type_new(utype);
            if (!stmp) {
                OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
                goto err;
            }
            *pval = (ASN1_VALUE *)stmp;
        } else {
            stmp = (ASN1_STRING *)*pval;
            stmp->type = utype;
        }
        if (!ASN1_STRING_set(stmp, cont, len)) {
            OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
            ASN1_STRING_free(stmp);
            *pval = NULL;
            goto err;
        }
        break;
    }
    /* If ASN1_ANY and NULL type fix up value */
    if (typ && (utype == V_ASN1_NULL))
        typ->value.ptr = NULL;

    ret = 1;
 err:
    if (!ret) {
        ASN1_TYPE_free(typ);
        if (opval)
            *opval = NULL;
    }
    return ret;
}