252 lines
9.1 KiB
Groff
252 lines
9.1 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SSL_CIPHER_get_name 3"
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.TH SSL_CIPHER_get_name 3 "2017-12-07" "1.0.2n" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_CIPHER_get_name, SSL_CIPHER_get_bits, SSL_CIPHER_get_version, SSL_CIPHER_description \- get SSL_CIPHER properties
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher);
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\& int SSL_CIPHER_get_bits(const SSL_CIPHER *cipher, int *alg_bits);
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\& char *SSL_CIPHER_get_version(const SSL_CIPHER *cipher);
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\& char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int size);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_CIPHER_get_name()\fR returns a pointer to the name of \fBcipher\fR. If the
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argument is the \s-1NULL\s0 pointer, a pointer to the constant value \*(L"\s-1NONE\*(R"\s0 is
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returned.
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.PP
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\&\fISSL_CIPHER_get_bits()\fR returns the number of secret bits used for \fBcipher\fR. If
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\&\fBalg_bits\fR is not \s-1NULL,\s0 it contains the number of bits processed by the
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chosen algorithm. If \fBcipher\fR is \s-1NULL, 0\s0 is returned.
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.PP
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\&\fISSL_CIPHER_get_version()\fR returns string which indicates the \s-1SSL/TLS\s0 protocol
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version that first defined the cipher.
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This is currently \fBSSLv2\fR or \fBTLSv1/SSLv3\fR.
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In some cases it should possibly return \*(L"TLSv1.2\*(R" but does not;
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use \fISSL_CIPHER_description()\fR instead.
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If \fBcipher\fR is \s-1NULL, \*(L"\s0(\s-1NONE\s0)\*(R" is returned.
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.PP
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\&\fISSL_CIPHER_description()\fR returns a textual description of the cipher used
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into the buffer \fBbuf\fR of length \fBlen\fR provided. \fBlen\fR must be at least
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128 bytes, otherwise a pointer to the string \*(L"Buffer too small\*(R" is
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returned. If \fBbuf\fR is \s-1NULL,\s0 a buffer of 128 bytes is allocated using
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\&\fIOPENSSL_malloc()\fR. If the allocation fails, a pointer to the string
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\&\*(L"OPENSSL_malloc Error\*(R" is returned.
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.SH "NOTES"
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.IX Header "NOTES"
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The number of bits processed can be different from the secret bits. An
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export cipher like e.g. \s-1EXP\-RC4\-MD5\s0 has only 40 secret bits. The algorithm
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does use the full 128 bits (which would be returned for \fBalg_bits\fR), of
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which however 88bits are fixed. The search space is hence only 40 bits.
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.PP
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The string returned by \fISSL_CIPHER_description()\fR in case of success consists
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of cleartext information separated by one or more blanks in the following
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sequence:
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.IP "<ciphername>" 4
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.IX Item "<ciphername>"
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Textual representation of the cipher name.
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.IP "<protocol version>" 4
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.IX Item "<protocol version>"
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Protocol version: \fBSSLv2\fR, \fBSSLv3\fR, \fBTLSv1.2\fR. The TLSv1.0 ciphers are
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flagged with SSLv3. No new ciphers were added by TLSv1.1.
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.IP "Kx=<key exchange>" 4
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.IX Item "Kx=<key exchange>"
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Key exchange method: \fB\s-1RSA\s0\fR (for export ciphers as \fB\s-1RSA\s0(512)\fR or
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\&\fB\s-1RSA\s0(1024)\fR), \fB\s-1DH\s0\fR (for export ciphers as \fB\s-1DH\s0(512)\fR or \fB\s-1DH\s0(1024)\fR),
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\&\fB\s-1DH/RSA\s0\fR, \fB\s-1DH/DSS\s0\fR, \fBFortezza\fR.
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.IP "Au=<authentication>" 4
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.IX Item "Au=<authentication>"
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Authentication method: \fB\s-1RSA\s0\fR, \fB\s-1DSS\s0\fR, \fB\s-1DH\s0\fR, \fBNone\fR. None is the
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representation of anonymous ciphers.
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.IP "Enc=<symmetric encryption method>" 4
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.IX Item "Enc=<symmetric encryption method>"
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Encryption method with number of secret bits: \fB\s-1DES\s0(40)\fR, \fB\s-1DES\s0(56)\fR,
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\&\fB3DES(168)\fR, \fB\s-1RC4\s0(40)\fR, \fB\s-1RC4\s0(56)\fR, \fB\s-1RC4\s0(64)\fR, \fB\s-1RC4\s0(128)\fR,
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\&\fB\s-1RC2\s0(40)\fR, \fB\s-1RC2\s0(56)\fR, \fB\s-1RC2\s0(128)\fR, \fB\s-1IDEA\s0(128)\fR, \fBFortezza\fR, \fBNone\fR.
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.IP "Mac=<message authentication code>" 4
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.IX Item "Mac=<message authentication code>"
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Message digest: \fB\s-1MD5\s0\fR, \fB\s-1SHA1\s0\fR.
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.IP "<export flag>" 4
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.IX Item "<export flag>"
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If the cipher is flagged exportable with respect to old \s-1US\s0 crypto
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regulations, the word "\fBexport\fR" is printed.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Some examples for the output of \fISSL_CIPHER_description()\fR:
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.PP
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.Vb 4
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\& EDH\-RSA\-DES\-CBC3\-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1
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\& EDH\-DSS\-DES\-CBC3\-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1
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\& RC4\-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5
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\& EXP\-RC4\-MD5 SSLv3 Kx=RSA(512) Au=RSA Enc=RC4(40) Mac=MD5 export
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.Ve
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.PP
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A comp[lete list can be retrieved by invoking the following command:
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.PP
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.Vb 1
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\& openssl ciphers \-v ALL
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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If \fISSL_CIPHER_description()\fR is called with \fBcipher\fR being \s-1NULL,\s0 the
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library crashes.
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.PP
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If \fISSL_CIPHER_description()\fR cannot handle a built-in cipher, the according
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description of the cipher property is \fBunknown\fR. This case should not
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occur.
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.PP
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The standard terminology for ephemeral Diffie-Hellman schemes is \s-1DHE
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\&\s0(finite field) or \s-1ECDHE \s0(elliptic curve). This version of OpenSSL
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idiosyncratically reports these schemes as \s-1EDH\s0 and \s-1EECDH,\s0 even though
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it also accepts the standard terminology.
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.PP
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It is recommended to use the standard terminology (\s-1DHE\s0 and \s-1ECDHE\s0)
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during configuration (e.g. via SSL_CTX_set_cipher_list) for clarity of
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configuration. OpenSSL versions after 1.0.2 will report the standard
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terms via SSL_CIPHER_get_name and SSL_CIPHER_description.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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See \s-1DESCRIPTION\s0
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(3), \fISSL_get_current_cipher\fR\|(3),
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\&\fISSL_get_ciphers\fR\|(3), \fIciphers\fR\|(1),
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\&\fISSL_CTX_set_cipher_list\fR\|(3)
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