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SHA224_Init.3
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.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32 .\" .\" Standard preamble: .\" ======================================================================== .de Sh \" Subsection heading .br .if t .Sp .ne 5 .PP \fB\\$1\fR .PP .. .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. | will give a .\" real vertical bar. \*(C+ will give a nicer C++. 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If \fBmd\fR is \s-1NULL\s0, the digest is placed in a static array. Note: setting \fBmd\fR to \s-1NULL\s0 is \fBnot thread safe\fR. .PP The following functions may be used if the message is not completely stored in memory: .PP \&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure. .PP \&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR. .PP The \s-1SHA224\s0, \s-1SHA256\s0, \s-1SHA384\s0 and \s-1SHA512\s0 families of functions operate in the same way as for the \s-1SHA1\s0 functions. Note that \s-1SHA224\s0 and \s-1SHA256\s0 use a \&\fB\s-1SHA256_CTX\s0\fR object instead of \fB\s-1SHA_CTX\s0\fR. \s-1SHA384\s0 and \s-1SHA512\s0 use \fB\s-1SHA512_CTX\s0\fR. The buffer \fBmd\fR must have space for the output from the \s-1SHA\s0 variant being used (defined by \s-1SHA224_DIGEST_LENGTH\s0, \s-1SHA256_DIGEST_LENGTH\s0, \s-1SHA384_DIGEST_LENGTH\s0 and \&\s-1SHA512_DIGEST_LENGTH\s0). Also note that, as for the \s-1\fISHA1\s0()\fR function above, the \&\s-1\fISHA224\s0()\fR, \s-1\fISHA256\s0()\fR, \s-1\fISHA384\s0()\fR and \s-1\fISHA512\s0()\fR functions are not thread safe if \&\fBmd\fR is \s-1NULL\s0. .PP The predecessor of \s-1SHA\-1\s0, \s-1SHA\s0, is also implemented, but it should be used only when backward compatibility is required. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fISHA1\s0()\fR, \s-1\fISHA224\s0()\fR, \s-1\fISHA256\s0()\fR, \s-1\fISHA384\s0()\fR and \s-1\fISHA512\s0()\fR return a pointer to the hash value. .PP \&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR and equivalent \s-1SHA224\s0, \s-1SHA256\s0, \&\s-1SHA384\s0 and \s-1SHA512\s0 functions return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180\-4 (Secure Hash Standard), \&\s-1ANSI\s0 X9.30 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIripemd\fR\|(3), \fIhmac\fR\|(3), \fIEVP_DigestInit\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1\fISHA1\s0()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all versions of SSLeay and OpenSSL.