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135 .TH sha 3 "2009-04-11" "0.9.8k" "OpenSSL"
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141 SHA1, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/sha.h>
147 \& unsigned char *SHA1(const unsigned char *d, unsigned long n,
148 \& unsigned char *md);
150 \& int SHA1_Init(SHA_CTX *c);
151 \& int SHA1_Update(SHA_CTX *c, const void *data,
152 \& unsigned long len);
153 \& int SHA1_Final(unsigned char *md, SHA_CTX *c);
156 .IX Header "DESCRIPTION"
157 \&\s-1SHA\-1\s0 (Secure Hash Algorithm) is a cryptographic hash function with a
160 \&\s-1\fISHA1\s0()\fR computes the \s-1SHA\-1\s0 message digest of the \fBn\fR
161 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
162 \&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest
163 is placed in a static array.
165 The following functions may be used if the message is not completely
168 \&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
170 \&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
171 be hashed (\fBlen\fR bytes at \fBdata\fR).
173 \&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
174 for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
176 Applications should use the higher level functions
177 \&\fIEVP_DigestInit\fR\|(3)
178 etc. instead of calling the hash functions directly.
180 The predecessor of \s-1SHA\-1\s0, \s-1SHA\s0, is also implemented, but it should be
181 used only when backward compatibility is required.
183 .IX Header "RETURN VALUES"
184 \&\s-1\fISHA1\s0()\fR returns a pointer to the hash value.
186 \&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR return 1 for success, 0 otherwise.
188 .IX Header "CONFORMING TO"
189 \&\s-1SHA:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180 (Secure Hash
191 \&\s-1SHA\-1:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180\-1 (Secure Hash
195 .IX Header "SEE ALSO"
196 \&\fIripemd\fR\|(3), \fIhmac\fR\|(3), \fIEVP_DigestInit\fR\|(3)
199 \&\s-1\fISHA1\s0()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
200 versions of SSLeay and OpenSSL.