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MD4_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. .PP The following functions may be used if the message is not completely stored in memory: .PP \&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure. .PP \&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fIMD2_Final()\fR places the message digest in \fBmd\fR, which must have space for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR. .PP \&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \&\fIMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure. .PP Applications should use the higher level functions \&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the hash functions directly. .SH "NOTE" .IX Header "NOTE" \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are recommended only for compatibility with existing applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be preferred. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR return pointers to the hash value. .PP \&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR, \&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1RFC\s0 1319, \s-1RFC\s0 1320, \s-1RFC\s0 1321 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIsha\fR\|(3), \fIripemd\fR\|(3), \fIEVP_DigestInit\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1\fIMD2\s0()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \s-1\fIMD5\s0()\fR, \fIMD5_Init()\fR, \&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay and OpenSSL. .PP \&\s-1\fIMD4\s0()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and above.