curl / libcurl / API / TLS options

TLS related options and the backends they work with

libcurl can use different TLS backends, selected at both build-time and run-time. This table shows all TLS related options and details the set of TLS backends that work with it.

The OpenSSL column also covers BoringSSL, libressl, quictls, AWS-LC and AmiSSL.

option BearSSLGnuTLSmbedTLSOpenSSLrustlsSchannelSecure TransportwolfSSL
CURLINFO_CAINFO
CURLINFO_CAPATH    
CURLINFO_CERTINFO    
CURLINFO_PROXY_SSL_VERIFYRESULT      
CURLINFO_SSL_ENGINES       
CURLINFO_SSL_VERIFYRESULT      
CURLINFO_TLS_SESSION      
CURLINFO_TLS_SSL_PTR 
CURLOPT_CAINFO
CURLOPT_CAINFO_BLOB 
CURLOPT_CAPATH    
CURLOPT_CA_CACHE_TIMEOUT       
CURLOPT_CERTINFO    
CURLOPT_CRLFILE     
CURLOPT_DOH_SSL_VERIFYHOST
CURLOPT_DOH_SSL_VERIFYPEER
CURLOPT_DOH_SSL_VERIFYSTATUS      
CURLOPT_ECH      
CURLOPT_EGDSOCKET       
CURLOPT_ISSUERCERT      
CURLOPT_ISSUERCERT_BLOB       
CURLOPT_KEYPASSWD    
CURLOPT_PINNEDPUBLICKEY  
CURLOPT_PROXY_CAINFO
CURLOPT_PROXY_CAINFO_BLOB    
CURLOPT_PROXY_CAPATH     
CURLOPT_PROXY_CRLFILE     
CURLOPT_PROXY_ISSUERCERT      
CURLOPT_PROXY_ISSUERCERT_BLOB       
CURLOPT_PROXY_KEYPASSWD    
CURLOPT_PROXY_PINNEDPUBLICKEY    
CURLOPT_PROXY_SSLCERT  
CURLOPT_PROXY_SSLCERTTYPE  
CURLOPT_PROXY_SSLCERT_BLOB     
CURLOPT_PROXY_SSLKEY    
CURLOPT_PROXY_SSLKEYTYPE     
CURLOPT_PROXY_SSLKEY_BLOB       
CURLOPT_PROXY_SSLVERSION
CURLOPT_PROXY_SSL_CIPHER_LIST  
CURLOPT_PROXY_SSL_OPTIONS
CURLOPT_PROXY_SSL_VERIFYHOST
CURLOPT_PROXY_SSL_VERIFYPEER
CURLOPT_PROXY_TLS13_CIPHERS     
CURLOPT_PROXY_TLSAUTH_PASSWORD      
CURLOPT_PROXY_TLSAUTH_TYPE      
CURLOPT_PROXY_TLSAUTH_USERNAME      
CURLOPT_RANDOM_FILE       
CURLOPT_SSLCERT  
CURLOPT_SSLCERTTYPE  
CURLOPT_SSLCERT_BLOB    
CURLOPT_SSLENGINE       
CURLOPT_SSLENGINE_DEFAULT       
CURLOPT_SSLKEY    
CURLOPT_SSLKEYTYPE     
CURLOPT_SSLKEY_BLOB       
CURLOPT_SSLVERSION
CURLOPT_SSL_CIPHER_LIST  
CURLOPT_SSL_CTX_DATA    
CURLOPT_SSL_CTX_FUNCTION    
CURLOPT_SSL_EC_CURVES      
CURLOPT_SSL_ENABLE_ALPN
CURLOPT_SSL_ENABLE_NPN
CURLOPT_SSL_FALSESTART       
CURLOPT_SSL_OPTIONS
CURLOPT_SSL_SESSIONID_CACHE
CURLOPT_SSL_VERIFYHOST
CURLOPT_SSL_VERIFYPEER
CURLOPT_SSL_VERIFYSTATUS      
CURLOPT_TLS13_CIPHERS     
CURLOPT_TLSAUTH_PASSWORD      
CURLOPT_TLSAUTH_TYPE      
CURLOPT_TLSAUTH_USERNAME      
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