

#include "internal/common.h" 
#include <openssl/ebcdic.h>
#include <openssl/err.h>
#include <openssl/params.h>



static int prepare_from_text(const OSSL_PARAM *paramdefs, const char *key,
                             const char *value, size_t value_n,
                             
                             const OSSL_PARAM **paramdef, int *ishex,
                             size_t *buf_n, BIGNUM **tmpbn, int *found)
{
    const OSSL_PARAM *p;
    size_t buf_bits;
    int r;

    
    *ishex = CHECK_AND_SKIP_PREFIX(key, "hex");

    p = *paramdef = OSSL_PARAM_locate_const(paramdefs, key);
    if (found != NULL)
        *found = p != NULL;
    if (p == NULL)
        return 0;

    switch (p->data_type) {
    case OSSL_PARAM_INTEGER:
    case OSSL_PARAM_UNSIGNED_INTEGER:
        if (*ishex)
            r = BN_hex2bn(tmpbn, value);
        else
            r = BN_asc2bn(tmpbn, value);

        if (r == 0 || *tmpbn == NULL)
            return 0;

        if (p->data_type == OSSL_PARAM_UNSIGNED_INTEGER
            && BN_is_negative(*tmpbn)) {
            ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_INVALID_NEGATIVE_VALUE);
            return 0;
        }

        
        if (p->data_type == OSSL_PARAM_INTEGER && BN_is_negative(*tmpbn)
            && !BN_add_word(*tmpbn, 1)) {
            return 0;
        }

        buf_bits = (size_t)BN_num_bits(*tmpbn);

        
        if (p->data_type == OSSL_PARAM_INTEGER && buf_bits % 8 == 0)
            buf_bits += 8;

        *buf_n = (buf_bits + 7) / 8;

        
        if (p->data_size > 0) {
            if (buf_bits > p->data_size * 8) {
                ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
                
                return 0;
            }
            
            *buf_n = p->data_size;
        }
        break;
    case OSSL_PARAM_UTF8_STRING:
        if (*ishex) {
            ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
            return 0;
        }
        *buf_n = strlen(value) + 1;
        break;
    case OSSL_PARAM_OCTET_STRING:
        if (*ishex) {
            size_t hexdigits = strlen(value);
            if ((hexdigits % 2) != 0) {
                
                ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ODD_NUMBER_OF_DIGITS);
                return 0;
            }
            *buf_n = hexdigits >> 1;
        } else {
            *buf_n = value_n;
        }
        break;
    }

    return 1;
}

static int construct_from_text(OSSL_PARAM *to, const OSSL_PARAM *paramdef,
                               const char *value, size_t value_n, int ishex,
                               void *buf, size_t buf_n, BIGNUM *tmpbn)
{
    if (buf == NULL)
        return 0;

    if (buf_n > 0) {
        switch (paramdef->data_type) {
        case OSSL_PARAM_INTEGER:
        case OSSL_PARAM_UNSIGNED_INTEGER:
            

            BN_bn2nativepad(tmpbn, buf, buf_n);

            
            if (paramdef->data_type == OSSL_PARAM_INTEGER
                && BN_is_negative(tmpbn)) {
                unsigned char *cp;
                size_t i = buf_n;

                for (cp = buf; i-- > 0; cp++)
                    *cp ^= 0xFF;
            }
            break;
        case OSSL_PARAM_UTF8_STRING:
#ifdef CHARSET_EBCDIC
            ebcdic2ascii(buf, value, buf_n);
#else
            strncpy(buf, value, buf_n);
#endif
            
            buf_n--;
            break;
        case OSSL_PARAM_OCTET_STRING:
            if (ishex) {
                size_t l = 0;

                if (!OPENSSL_hexstr2buf_ex(buf, buf_n, &l, value, ':'))
                    return 0;
            } else {
                memcpy(buf, value, buf_n);
            }
            break;
        }
    }

    *to = *paramdef;
    to->data = buf;
    to->data_size = buf_n;
    to->return_size = OSSL_PARAM_UNMODIFIED;

    return 1;
}

int OSSL_PARAM_allocate_from_text(OSSL_PARAM *to,
                                  const OSSL_PARAM *paramdefs,
                                  const char *key, const char *value,
                                  size_t value_n, int *found)
{
    const OSSL_PARAM *paramdef = NULL;
    int ishex = 0;
    void *buf = NULL;
    size_t buf_n = 0;
    BIGNUM *tmpbn = NULL;
    int ok = 0;

    if (to == NULL || paramdefs == NULL)
        return 0;

    if (!prepare_from_text(paramdefs, key, value, value_n,
                           &paramdef, &ishex, &buf_n, &tmpbn, found))
        goto err;

    if ((buf = OPENSSL_zalloc(buf_n > 0 ? buf_n : 1)) == NULL)
        goto err;

    ok = construct_from_text(to, paramdef, value, value_n, ishex,
                             buf, buf_n, tmpbn);
    BN_free(tmpbn);
    if (!ok)
        OPENSSL_free(buf);
    return ok;
 err:
    BN_free(tmpbn);
    return 0;
}
