NetBSD/lib/libcrypto/man/sha.3

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.TH sha 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.rm #[ #] #H #V #F C
.SH "NAME"
SHA1, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.PP
.Vb 1
\& #include <openssl/sha.h>
.Ve
.Vb 2
\& unsigned char *SHA1(const unsigned char *d, unsigned long n,
\& unsigned char *md);
.Ve
.Vb 4
\& void SHA1_Init(SHA_CTX *c);
\& void SHA1_Update(SHA_CTX *c, const void *data,
\& unsigned long len);
\& void SHA1_Final(unsigned char *md, SHA_CTX *c);
.Ve
.SH "DESCRIPTION"
SHA\-1 (Secure Hash Algorithm) is a cryptographic hash function with a
160 bit output.
.PP
\fISHA1()\fR computes the SHA\-1 message digest of the \fBn\fR
bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
SHA_DIGEST_LENGTH == 20 bytes of output). If \fBmd\fR is NULL, 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
\fISHA1_Init()\fR initializes a \fBSHA_CTX\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 SHA_DIGEST_LENGTH == 20 bytes of output, and erases the \fBSHA_CTX\fR.
.PP
Applications should use the higher level functions
the \fIEVP_DigestInit(3)|EVP_DigestInit(3)\fR manpage
etc. instead of calling the hash functions directly.
.PP
The predecessor of SHA\-1, SHA, is also implemented, but it should be
used only when backward compatibility is required.
.SH "RETURN VALUES"
\fISHA1()\fR returns a pointer to the hash value.
.PP
\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR do not return values.
.SH "CONFORMING TO"
SHA: US Federal Information Processing Standard FIPS PUB 180 (Secure Hash
Standard),
SHA\-1: US Federal Information Processing Standard FIPS PUB 180-1 (Secure Hash
Standard),
ANSI X9.30
.SH "SEE ALSO"
the \fIripemd(3)|ripemd(3)\fR manpage, the \fIhmac(3)|hmac(3)\fR manpage, the \fIEVP_DigestInit(3)|EVP_DigestInit(3)\fR manpage
.SH "HISTORY"
\fISHA1()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
versions of SSLeay and OpenSSL.
.rn }` ''
.IX Title "sha 3"
.IX Name "SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algorithm"
.IX Header "NAME"
.IX Header "SYNOPSIS"
.IX Header "DESCRIPTION"
.IX Header "RETURN VALUES"
.IX Header "CONFORMING TO"
.IX Header "SEE ALSO"
.IX Header "HISTORY"