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Diffstat (limited to 'usr/man/man3/hmac.3')
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diff --git a/usr/man/man3/hmac.3 b/usr/man/man3/hmac.3 new file mode 100755 index 000000000..8abe77ac2 --- /dev/null +++ b/usr/man/man3/hmac.3 @@ -0,0 +1,231 @@ +.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +HMAC, HMAC_Init, HMAC_Update, HMAC_Final, HMAC_cleanup \- HMAC message +authentication code +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/hmac.h> +\& +\& unsigned char *HMAC(const EVP_MD *evp_md, const void *key, +\& int key_len, const unsigned char *d, int n, +\& unsigned char *md, unsigned int *md_len); +\& +\& void HMAC_CTX_init(HMAC_CTX *ctx); +\& +\& void HMAC_Init(HMAC_CTX *ctx, const void *key, int key_len, +\& const EVP_MD *md); +\& void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int key_len, +\& const EVP_MD *md, ENGINE *impl); +\& void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len); +\& void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len); +\& +\& void HMAC_CTX_cleanup(HMAC_CTX *ctx); +\& void HMAC_cleanup(HMAC_CTX *ctx); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\s-1HMAC\s0 is a \s-1MAC \s0(message authentication code), i.e. a keyed hash +function used for message authentication, which is based on a hash +function. +.PP +\&\s-1\fIHMAC\s0()\fR computes the message authentication code of the \fBn\fR bytes at +\&\fBd\fR using the hash function \fBevp_md\fR and the key \fBkey\fR which is +\&\fBkey_len\fR bytes long. +.PP +It places the result in \fBmd\fR (which must have space for the output of +the hash function, which is no more than \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes). +If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static array. The size of +the output is placed in \fBmd_len\fR, unless it is \fB\s-1NULL\s0\fR. +.PP +\&\fBevp_md\fR can be \fIEVP_sha1()\fR, \fIEVP_ripemd160()\fR etc. +.PP +\&\fIHMAC_CTX_init()\fR initialises a \fB\s-1HMAC_CTX\s0\fR before first use. It must be +called. +.PP +\&\fIHMAC_CTX_cleanup()\fR erases the key and other data from the \fB\s-1HMAC_CTX\s0\fR +and releases any associated resources. It must be called when an +\&\fB\s-1HMAC_CTX\s0\fR is no longer required. +.PP +\&\fIHMAC_cleanup()\fR is an alias for \fIHMAC_CTX_cleanup()\fR included for back +compatibility with 0.9.6b, it is deprecated. +.PP +The following functions may be used if the message is not completely +stored in memory: +.PP +\&\fIHMAC_Init()\fR initializes a \fB\s-1HMAC_CTX\s0\fR structure to use the hash +function \fBevp_md\fR and the key \fBkey\fR which is \fBkey_len\fR bytes +long. It is deprecated and only included for backward compatibility +with OpenSSL 0.9.6b. +.PP +\&\fIHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use +the function \fBevp_md\fR and key \fBkey\fR. Either can be \s-1NULL,\s0 in which +case the existing one will be reused. \fIHMAC_CTX_init()\fR must have been +called before the first use of an \fB\s-1HMAC_CTX\s0\fR in this +function. \fBN.B. \f(BIHMAC_Init()\fB had this undocumented behaviour in +previous versions of OpenSSL \- failure to switch to \f(BIHMAC_Init_ex()\fB in +programs that expect it will cause them to stop working\fR. +.PP +\&\fIHMAC_Update()\fR can be called repeatedly with chunks of the message to +be authenticated (\fBlen\fR bytes at \fBdata\fR). +.PP +\&\fIHMAC_Final()\fR places the message authentication code in \fBmd\fR, which +must have space for the hash function output. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\s-1\fIHMAC\s0()\fR returns a pointer to the message authentication code. +.PP +\&\fIHMAC_CTX_init()\fR, \fIHMAC_Init_ex()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and +\&\fIHMAC_CTX_cleanup()\fR do not return values. +.SH "CONFORMING TO" +.IX Header "CONFORMING TO" +\&\s-1RFC 2104\s0 +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIsha\fR\|(3), \fIevp\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\s-1\fIHMAC\s0()\fR, \fIHMAC_Init()\fR, \fIHMAC_Update()\fR, \fIHMAC_Final()\fR and \fIHMAC_cleanup()\fR +are available since SSLeay 0.9.0. +.PP +\&\fIHMAC_CTX_init()\fR, \fIHMAC_Init_ex()\fR and \fIHMAC_CTX_cleanup()\fR are available +since OpenSSL 0.9.7. |