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141 .TH SHA 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
144 \&\s-1SHA1\s0, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/sha.h>
151 \& unsigned char *SHA1(const unsigned char *d, unsigned long n,
152 \& unsigned char *md);
155 \& void SHA1_Init(SHA_CTX *c);
156 \& void SHA1_Update(SHA_CTX *c, const void *data,
157 \& unsigned long len);
158 \& void SHA1_Final(unsigned char *md, SHA_CTX *c);
161 .IX Header "DESCRIPTION"
162 \&\s-1SHA-1\s0 (Secure Hash Algorithm) is a cryptographic hash function with a
165 \&\fISHA1()\fR computes the \s-1SHA-1\s0 message digest of the \fBn\fR
166 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
167 \&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest
168 is placed in a static array.
170 The following functions may be used if the message is not completely
173 \&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
175 \&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
176 be hashed (\fBlen\fR bytes at \fBdata\fR).
178 \&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
179 for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
181 Applications should use the higher level functions
183 etc. instead of calling the hash functions directly.
185 The predecessor of \s-1SHA-1\s0, \s-1SHA\s0, is also implemented, but it should be
186 used only when backward compatibility is required.
188 .IX Header "RETURN VALUES"
189 \&\fISHA1()\fR returns a pointer to the hash value.
191 \&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR do not return values.
193 .IX Header "CONFORMING TO"
194 \&\s-1SHA:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180 (Secure Hash
196 \&\s-1SHA-1:\s0 \s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 \s-1PUB\s0 180\-1 (Secure Hash
200 .IX Header "SEE ALSO"
201 ripemd(3), hmac(3), EVP_DigestInit(3)
204 \&\fISHA1()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
205 versions of SSLeay and OpenSSL.