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129 .\" ========================================================================
132 .TH sha 3 "2017-11-02" "1.0.2m" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 SHA1, SHA1_Init, SHA1_Update, SHA1_Final, SHA224, SHA224_Init, SHA224_Update,
139 SHA224_Final, SHA256, SHA256_Init, SHA256_Update, SHA256_Final, SHA384,
140 SHA384_Init, SHA384_Update, SHA384_Final, SHA512, SHA512_Init, SHA512_Update,
141 SHA512_Final \- Secure Hash Algorithm
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/sha.h>
147 \& int SHA1_Init(SHA_CTX *c);
148 \& int SHA1_Update(SHA_CTX *c, const void *data, size_t len);
149 \& int SHA1_Final(unsigned char *md, SHA_CTX *c);
150 \& unsigned char *SHA1(const unsigned char *d, size_t n,
151 \& unsigned char *md);
153 \& int SHA224_Init(SHA256_CTX *c);
154 \& int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
155 \& int SHA224_Final(unsigned char *md, SHA256_CTX *c);
156 \& unsigned char *SHA224(const unsigned char *d, size_t n,
157 \& unsigned char *md);
159 \& int SHA256_Init(SHA256_CTX *c);
160 \& int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
161 \& int SHA256_Final(unsigned char *md, SHA256_CTX *c);
162 \& unsigned char *SHA256(const unsigned char *d, size_t n,
163 \& unsigned char *md);
165 \& int SHA384_Init(SHA512_CTX *c);
166 \& int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
167 \& int SHA384_Final(unsigned char *md, SHA512_CTX *c);
168 \& unsigned char *SHA384(const unsigned char *d, size_t n,
169 \& unsigned char *md);
171 \& int SHA512_Init(SHA512_CTX *c);
172 \& int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
173 \& int SHA512_Final(unsigned char *md, SHA512_CTX *c);
174 \& unsigned char *SHA512(const unsigned char *d, size_t n,
175 \& unsigned char *md);
178 .IX Header "DESCRIPTION"
179 Applications should use the higher level functions
180 \&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the hash
183 \&\s-1SHA\-1 \s0(Secure Hash Algorithm) is a cryptographic hash function with a
186 \&\s-1\fISHA1\s0()\fR computes the \s-1SHA\-1\s0 message digest of the \fBn\fR
187 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
188 \&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest
189 is placed in a static array. Note: setting \fBmd\fR to \s-1NULL\s0 is \fBnot thread safe\fR.
191 The following functions may be used if the message is not completely
194 \&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
196 \&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
197 be hashed (\fBlen\fR bytes at \fBdata\fR).
199 \&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
200 for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
202 The \s-1SHA224, SHA256, SHA384\s0 and \s-1SHA512\s0 families of functions operate in the
203 same way as for the \s-1SHA1\s0 functions. Note that \s-1SHA224\s0 and \s-1SHA256\s0 use a
204 \&\fB\s-1SHA256_CTX\s0\fR object instead of \fB\s-1SHA_CTX\s0\fR. \s-1SHA384\s0 and \s-1SHA512\s0 use \fB\s-1SHA512_CTX\s0\fR.
205 The buffer \fBmd\fR must have space for the output from the \s-1SHA\s0 variant being used
206 (defined by \s-1SHA224_DIGEST_LENGTH, SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH\s0 and
207 \&\s-1SHA512_DIGEST_LENGTH\s0). Also note that, as for the \s-1\fISHA1\s0()\fR function above, the
208 \&\s-1\fISHA224\s0()\fR, \s-1\fISHA256\s0()\fR, \s-1\fISHA384\s0()\fR and \s-1\fISHA512\s0()\fR functions are not thread safe if
209 \&\fBmd\fR is \s-1NULL.\s0
211 The predecessor of \s-1SHA\-1, SHA,\s0 is also implemented, but it should be
212 used only when backward compatibility is required.
214 .IX Header "RETURN VALUES"
215 \&\s-1\fISHA1\s0()\fR, \s-1\fISHA224\s0()\fR, \s-1\fISHA256\s0()\fR, \s-1\fISHA384\s0()\fR and \s-1\fISHA512\s0()\fR return a pointer to the hash
218 \&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR and equivalent \s-1SHA224, SHA256,
219 SHA384\s0 and \s-1SHA512\s0 functions return 1 for success, 0 otherwise.
221 .IX Header "CONFORMING TO"
222 \&\s-1US\s0 Federal Information Processing Standard \s-1FIPS PUB 180\-4 \s0(Secure Hash
226 .IX Header "SEE ALSO"
227 \&\fIripemd\fR\|(3), \fIhmac\fR\|(3), \fIEVP_DigestInit\fR\|(3)
230 \&\s-1\fISHA1\s0()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
231 versions of SSLeay and OpenSSL.