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136 .TH sha 3 "2015-01-08" "0.9.8zd" "OpenSSL"
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142 SHA1, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/sha.h>
148 \& unsigned char *SHA1(const unsigned char *d, unsigned long n,
149 \& unsigned char *md);
151 \& int SHA1_Init(SHA_CTX *c);
152 \& int SHA1_Update(SHA_CTX *c, const void *data,
153 \& unsigned long len);
154 \& int SHA1_Final(unsigned char *md, SHA_CTX *c);
157 .IX Header "DESCRIPTION"
158 \&\s-1SHA\-1 \s0(Secure Hash Algorithm) is a cryptographic hash function with a
161 \&\s-1\fISHA1\s0()\fR computes the \s-1SHA\-1\s0 message digest of the \fBn\fR
162 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
163 \&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest
164 is placed in a static array.
166 The following functions may be used if the message is not completely
169 \&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
171 \&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
172 be hashed (\fBlen\fR bytes at \fBdata\fR).
174 \&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
175 for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
177 Applications should use the higher level functions
178 \&\fIEVP_DigestInit\fR\|(3)
179 etc. instead of calling the hash functions directly.
181 The predecessor of \s-1SHA\-1, SHA,\s0 is also implemented, but it should be
182 used only when backward compatibility is required.
184 .IX Header "RETURN VALUES"
185 \&\s-1\fISHA1\s0()\fR returns a pointer to the hash value.
187 \&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR return 1 for success, 0 otherwise.
189 .IX Header "CONFORMING TO"
190 \&\s-1SHA: US\s0 Federal Information Processing Standard \s-1FIPS PUB 180 \s0(Secure Hash
192 \&\s-1SHA\-1: US\s0 Federal Information Processing Standard \s-1FIPS PUB 180\-1 \s0(Secure Hash
196 .IX Header "SEE ALSO"
197 \&\fIripemd\fR\|(3), \fIhmac\fR\|(3), \fIEVP_DigestInit\fR\|(3)
200 \&\s-1\fISHA1\s0()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
201 versions of SSLeay and OpenSSL.