|
|
Where does Ciphering & Encryption occur?
|
|
SSL_CIPHER_get_name(3) OpenSSL SSL_CIPHER_get_name(3) NAME
SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description - get SSL_CIPHER properties SYNOPSIS
#include <openssl/ssl.h> const char *SSL_CIPHER_get_name(SSL_CIPHER *cipher); int SSL_CIPHER_get_bits(SSL_CIPHER *cipher, int *alg_bits); char *SSL_CIPHER_get_version(SSL_CIPHER *cipher); char *SSL_CIPHER_description(SSL_CIPHER *cipher, char *buf, int size); DESCRIPTION
SSL_CIPHER_get_name() returns a pointer to the name of cipher. If the argument is the NULL pointer, a pointer to the constant value "NONE" is returned. SSL_CIPHER_get_bits() returns the number of secret bits used for cipher. If alg_bits is not NULL, it contains the number of bits processed by the chosen algorithm. If cipher is NULL, 0 is returned. SSL_CIPHER_get_version() returns the protocol version for cipher, currently "SSLv2", "SSLv3", or "TLSv1". If cipher is NULL, "(NONE)" is returned. SSL_CIPHER_description() returns a textual description of the cipher used into the buffer buf of length len provided. len must be at least 128 bytes, otherwise a pointer to the the string "Buffer too small" is returned. If buf is NULL, a buffer of 128 bytes is allocated using OPENSSL_malloc(). If the allocation fails, a pointer to the string "OPENSSL_malloc Error" is returned. NOTES
The number of bits processed can be different from the secret bits. An export cipher like e.g. EXP-RC4-MD5 has only 40 secret bits. The algorithm does use the full 128 bits (which would be returned for alg_bits), of which however 88bits are fixed. The search space is hence only 40 bits. The string returned by SSL_CIPHER_description() in case of success consists of cleartext information separated by one or more blanks in the following sequence: <ciphername> Textual representation of the cipher name. <protocol version> Protocol version: SSLv2, SSLv3. The TLSv1 ciphers are flagged with SSLv3. Kx=<key exchange> Key exchange method: RSA (for export ciphers as RSA(512) or RSA(1024)), DH (for export ciphers as DH(512) or DH(1024)), DH/RSA, DH/DSS, Fortezza. Au=<authentication> Authentication method: RSA, DSS, DH, None. None is the representation of anonymous ciphers. Enc=<symmetric encryption method> Encryption method with number of secret bits: DES(40), DES(56), 3DES(168), RC4(40), RC4(56), RC4(64), RC4(128), RC2(40), RC2(56), RC2(128), IDEA(128), Fortezza, None. Mac=<message authentication code> Message digest: MD5, SHA1. <export flag> If the cipher is flagged exportable with respect to old US crypto regulations, the word "export" is printed. EXAMPLES
Some examples for the output of SSL_CIPHER_description(): EDH-RSA-DES-CBC3-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1 EDH-DSS-DES-CBC3-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1 RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5 EXP-RC4-MD5 SSLv3 Kx=RSA(512) Au=RSA Enc=RC4(40) Mac=MD5 export BUGS
If SSL_CIPHER_description() is called with cipher being NULL, the library crashes. If SSL_CIPHER_description() cannot handle a built-in cipher, the according description of the cipher property is unknown. This case should not occur. RETURN VALUES
See DESCRIPTION SEE ALSO
ssl(3), SSL_get_current_cipher(3), SSL_get_ciphers(3), ciphers(1) 0.9.7d 2002-04-30 SSL_CIPHER_get_name(3)
