static int ssl_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
{
    int n;
    unsigned char *p;
    n = i2d_X509(x, NULL);
    if (n < 0 || !BUF_MEM_grow_clean(buf, (int)(n + (*l) + 3))) {
        SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
        return 0;
    }
    p = (unsigned char *)&(buf->data[*l]);
    l2n3(n, p);
    n = i2d_X509(x, &p);
    if (n < 0) {
        SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
        return 0;
    }
    *l += n + 3;
    return 1;
}
['unsigned long ssl3_output_cert_chain(SSL *s, CERT_PKEY *cpk)\n{\n    unsigned char *p;\n    unsigned long l = 3 + SSL_HM_HEADER_LENGTH(s);\n    if (!ssl_add_cert_chain(s, cpk, &l))\n        return 0;\n    l -= 3 + SSL_HM_HEADER_LENGTH(s);\n    p = ssl_handshake_start(s);\n    l2n3(l, p);\n    l += 3;\n    if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE, l)) {\n        SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN, ERR_R_INTERNAL_ERROR);\n        return 0;\n    }\n    return l + SSL_HM_HEADER_LENGTH(s);\n}', 'int ssl_add_cert_chain(SSL *s, CERT_PKEY *cpk, unsigned long *l)\n{\n    BUF_MEM *buf = s->init_buf;\n    int i, chain_count;\n    X509 *x;\n    STACK_OF(X509) *extra_certs;\n    STACK_OF(X509) *chain = NULL;\n    X509_STORE *chain_store;\n    if (!BUF_MEM_grow_clean(buf, 10)) {\n        SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_BUF_LIB);\n        return 0;\n    }\n    if (!cpk || !cpk->x509)\n        return 1;\n    x = cpk->x509;\n    if (cpk->chain)\n        extra_certs = cpk->chain;\n    else\n        extra_certs = s->ctx->extra_certs;\n    if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs)\n        chain_store = NULL;\n    else if (s->cert->chain_store)\n        chain_store = s->cert->chain_store;\n    else\n        chain_store = s->ctx->cert_store;\n    if (chain_store) {\n        X509_STORE_CTX* xs_ctx = X509_STORE_CTX_new();\n        if (xs_ctx == NULL) {\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);\n            return (0);\n        }\n        if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) {\n            X509_STORE_CTX_free(xs_ctx);\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_X509_LIB);\n            return (0);\n        }\n        (void) X509_verify_cert(xs_ctx);\n        ERR_clear_error();\n        chain =  X509_STORE_CTX_get0_chain(xs_ctx);\n        i = ssl_security_cert_chain(s, chain, NULL, 0);\n        if (i != 1) {\n#if 0\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_EE_KEY_TOO_SMALL);\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_KEY_TOO_SMALL);\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_MD_TOO_WEAK);\n#endif\n            X509_STORE_CTX_free(xs_ctx);\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i);\n            return 0;\n        }\n        chain_count = sk_X509_num(chain);\n        for (i = 0; i < chain_count; i++) {\n            x = sk_X509_value(chain, i);\n            if (!ssl_add_cert_to_buf(buf, l, x)) {\n                X509_STORE_CTX_free(xs_ctx);\n                return 0;\n            }\n        }\n        X509_STORE_CTX_free(xs_ctx);\n    } else {\n        i = ssl_security_cert_chain(s, extra_certs, x, 0);\n        if (i != 1) {\n            SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i);\n            return 0;\n        }\n        if (!ssl_add_cert_to_buf(buf, l, x))\n            return 0;\n        for (i = 0; i < sk_X509_num(extra_certs); i++) {\n            x = sk_X509_value(extra_certs, i);\n            if (!ssl_add_cert_to_buf(buf, l, x))\n                return 0;\n        }\n    }\n    return 1;\n}', 'static int ssl_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)\n{\n    int n;\n    unsigned char *p;\n    n = i2d_X509(x, NULL);\n    if (n < 0 || !BUF_MEM_grow_clean(buf, (int)(n + (*l) + 3))) {\n        SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);\n        return 0;\n    }\n    p = (unsigned char *)&(buf->data[*l]);\n    l2n3(n, p);\n    n = i2d_X509(x, &p);\n    if (n < 0) {\n        SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);\n        return 0;\n    }\n    *l += n + 3;\n    return 1;\n}', 'size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len)\n{\n    char *ret;\n    size_t n;\n    if (str->length >= len) {\n        if (str->data != NULL)\n            memset(&str->data[len], 0, str->length - len);\n        str->length = len;\n        return (len);\n    }\n    if (str->max >= len) {\n        memset(&str->data[str->length], 0, len - str->length);\n        str->length = len;\n        return (len);\n    }\n    if (len > LIMIT_BEFORE_EXPANSION) {\n        BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);\n        return 0;\n    }\n    n = (len + 3) / 3 * 4;\n    if ((str->flags & BUF_MEM_FLAG_SECURE))\n        ret = sec_alloc_realloc(str, n);\n    else\n        ret = OPENSSL_clear_realloc(str->data, str->max, n);\n    if (ret == NULL) {\n        BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);\n        len = 0;\n    } else {\n        str->data = ret;\n        str->max = n;\n        memset(&str->data[str->length], 0, len - str->length);\n        str->length = len;\n    }\n    return (len);\n}']