📄 uclmmbase-md5.html
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><H1
><A
NAME="UCLMMBASE-MD5"
>MD5</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN67"
></A
><H2
>Name</H2
>MD5 -- Message Digest-5 algorithm.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN70"
></A
><H2
>Synopsis</H2
><TABLE
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><PRE
CLASS="SYNOPSIS"
> #include <md5.h>
typedef <A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
>;
void <A
HREF="uclmmbase-md5.html#MD5INIT"
>MD5Init</A
> (<A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
> *context);
void <A
HREF="uclmmbase-md5.html#MD5UPDATE"
>MD5Update</A
> (<A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
> *context,
unsigned char *input,
unsigned int inputLen);
void <A
HREF="uclmmbase-md5.html#MD5FINAL"
>MD5Final</A
> (unsigned char digest[16],
<A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
> *context);</PRE
></TD
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></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN80"
></A
><H2
>Description</H2
><P
>The MD5 algorithm calculates a 128-bit digest of an arbitrary length
stream of data. The digest is a fingerprint that can be used to
verify the integrity of a transmitted message. The sender and receiver
of the message independently calculate the message digest and compare
values to ascertain the integrity of the message. The probability of
two messages having the same digest is miniscule.</P
><P
>The MD5 algorithm is the intellectual property of RSA Data Security, Inc.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN84"
></A
><H2
>Details</H2
><DIV
CLASS="REFSECT2"
><A
NAME="AEN86"
></A
><H3
><A
NAME="MD5-CTX-CAPS"
></A
>MD5_CTX</H3
><TABLE
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>typedef struct {
uint32_t state[4]; /* state (ABCD) */
uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */
unsigned char buffer[64]; /* input buffer */
} MD5_CTX;</PRE
></TD
></TR
></TABLE
><P
>The state for the MD5 calculation.</P
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN91"
></A
><H3
><A
NAME="MD5INIT"
></A
>MD5Init ()</H3
><TABLE
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><PRE
CLASS="PROGRAMLISTING"
>void MD5Init (<A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
> *context);</PRE
></TD
></TR
></TABLE
><P
>Initializes MD5 context for the start of message digest computation.</P
><P
></P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN98"
></A
><P
></P
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><TT
CLASS="PARAMETER"
><I
>context</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
> MD5 context to be initialized.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN107"
></A
><H3
><A
NAME="MD5UPDATE"
></A
>MD5Update ()</H3
><TABLE
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><PRE
CLASS="PROGRAMLISTING"
>void MD5Update (<A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
> *context,
unsigned char *input,
unsigned int inputLen);</PRE
></TD
></TR
></TABLE
><P
>MD5 block update operation. Continues an MD5 message-digest operation,
processing another message block, and updating the context.</P
><P
></P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN114"
></A
><P
></P
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><TT
CLASS="PARAMETER"
><I
>context</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
> MD5 context to be updated.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>input</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
> pointer to data to be fed into MD5 algorithm.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>inputLen</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
> size of <TT
CLASS="PARAMETER"
><I
>input</I
></TT
> data in bytes.</TD
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></TBODY
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><P
></P
></DIV
></DIV
><HR><DIV
CLASS="REFSECT2"
><A
NAME="AEN132"
></A
><H3
><A
NAME="MD5FINAL"
></A
>MD5Final ()</H3
><TABLE
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><PRE
CLASS="PROGRAMLISTING"
>void MD5Final (unsigned char digest[16],
<A
HREF="uclmmbase-md5.html#MD5-CTX-CAPS"
>MD5_CTX</A
> *context);</PRE
></TD
></TR
></TABLE
><P
>Ends an MD5 message-digest operation, writing the the message
digest and zeroing the context. The context must be initialized
with <A
HREF="uclmmbase-md5.html#MD5INIT"
>MD5Init</A
>() before being used for other MD5 checksum calculations.</P
><P
></P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN140"
></A
><P
></P
><TABLE
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><TD
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VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>digest</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
> 16-byte buffer to write MD5 checksum.</TD
></TR
><TR
><TD
WIDTH="20%"
ALIGN="RIGHT"
VALIGN="TOP"
><TT
CLASS="PARAMETER"
><I
>context</I
></TT
> :</TD
><TD
WIDTH="80%"
ALIGN="LEFT"
VALIGN="TOP"
> MD5 context to be finalized.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN153"
></A
><H2
>See Also</H2
><P
><A
HREF="http://www.ietf.org/rfc/rfc1321.txt"
TARGET="_top"
>RFC1321 - The MD5
Message Digest Algorithm</A
></P
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