210 lines
6.1 KiB
Groff
210 lines
6.1 KiB
Groff
.\" $NetBSD: openssl_sha.3,v 1.6 2002/08/09 16:15:46 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "sha 3"
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.TH sha 3 "0.9.6g" "2000-07-22" "OpenSSL"
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.UC
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.SH "NAME"
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\&\s-1SHA1\s0, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/sha.h>
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.Ve
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.Vb 2
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\& unsigned char *SHA1(const unsigned char *d, unsigned long n,
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\& unsigned char *md);
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.Ve
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.Vb 4
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\& void SHA1_Init(SHA_CTX *c);
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\& void SHA1_Update(SHA_CTX *c, const void *data,
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\& unsigned long len);
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\& void SHA1_Final(unsigned char *md, SHA_CTX *c);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\s-1SHA-1\s0 (Secure Hash Algorithm) is a cryptographic hash function with a
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160 bit output.
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.PP
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\&\fISHA1()\fR computes the \s-1SHA-1\s0 message digest of the \fBn\fR
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bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
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\&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest
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is placed in a static array.
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.PP
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The following functions may be used if the message is not completely
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stored in memory:
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.PP
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\&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
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.PP
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\&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
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be hashed (\fBlen\fR bytes at \fBdata\fR).
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.PP
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\&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
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for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
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.PP
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Applications should use the higher level functions
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EVP_DigestInit(3)
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etc. instead of calling the hash functions directly.
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.PP
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The predecessor of \s-1SHA-1\s0, \s-1SHA\s0, is also implemented, but it should be
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used only when backward compatibility is required.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISHA1()\fR returns a pointer to the hash value.
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.PP
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\&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR do not return values.
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1SHA:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180 (Secure Hash
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Standard),
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\&\s-1SHA-1:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180\-1 (Secure Hash
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Standard),
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\&\s-1ANSI\s0 X9.30
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_ripemd(3), openssl_hmac(3), EVP_DigestInit(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fISHA1()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
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versions of SSLeay and OpenSSL.
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