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132 .TH sha 3 "2008-09-27" "0.9.8i" "OpenSSL"
134 SHA1, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/sha.h>
142 \& unsigned char *SHA1(const unsigned char *d, unsigned long n,
143 \& unsigned char *md);
147 \& int SHA1_Init(SHA_CTX *c);
148 \& int SHA1_Update(SHA_CTX *c, const void *data,
149 \& unsigned long len);
150 \& int SHA1_Final(unsigned char *md, SHA_CTX *c);
153 .IX Header "DESCRIPTION"
154 \&\s-1SHA\-1\s0 (Secure Hash Algorithm) is a cryptographic hash function with a
157 \&\s-1\fISHA1\s0()\fR computes the \s-1SHA\-1\s0 message digest of the \fBn\fR
158 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
159 \&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest
160 is placed in a static array.
162 The following functions may be used if the message is not completely
165 \&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
167 \&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
168 be hashed (\fBlen\fR bytes at \fBdata\fR).
170 \&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
171 for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
173 Applications should use the higher level functions
174 \&\fIEVP_DigestInit\fR\|(3)
175 etc. instead of calling the hash functions directly.
177 The predecessor of \s-1SHA\-1\s0, \s-1SHA\s0, is also implemented, but it should be
178 used only when backward compatibility is required.
180 .IX Header "RETURN VALUES"
181 \&\s-1\fISHA1\s0()\fR returns a pointer to the hash value.
183 \&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR return 1 for success, 0 otherwise.
185 .IX Header "CONFORMING TO"
186 \&\s-1SHA:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180 (Secure Hash
188 \&\s-1SHA\-1:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180\-1 (Secure Hash
192 .IX Header "SEE ALSO"
193 \&\fIripemd\fR\|(3), \fIhmac\fR\|(3), \fIEVP_DigestInit\fR\|(3)
196 \&\s-1\fISHA1\s0()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
197 versions of SSLeay and OpenSSL.