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+.\" ========================================================================
+.\"
+.IX Title "sha 3"
+.TH sha 3 "2015-12-03" "1.0.2e" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+SHA1, SHA1_Init, SHA1_Update, SHA1_Final, SHA224, SHA224_Init, SHA224_Update,
+SHA224_Final, SHA256, SHA256_Init, SHA256_Update, SHA256_Final, SHA384,
+SHA384_Init, SHA384_Update, SHA384_Final, SHA512, SHA512_Init, SHA512_Update,
+SHA512_Final \- Secure Hash Algorithm
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/sha.h>
+\&
+\& int SHA1_Init(SHA_CTX *c);
+\& int SHA1_Update(SHA_CTX *c, const void *data, size_t len);
+\& int SHA1_Final(unsigned char *md, SHA_CTX *c);
+\& unsigned char *SHA1(const unsigned char *d, size_t n,
+\&      unsigned char *md);
+\&
+\& int SHA224_Init(SHA256_CTX *c);
+\& int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
+\& int SHA224_Final(unsigned char *md, SHA256_CTX *c);
+\& unsigned char *SHA224(const unsigned char *d, size_t n,
+\&      unsigned char *md);
+\&
+\& int SHA256_Init(SHA256_CTX *c);
+\& int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
+\& int SHA256_Final(unsigned char *md, SHA256_CTX *c);
+\& unsigned char *SHA256(const unsigned char *d, size_t n,
+\&      unsigned char *md);
+\&
+\& int SHA384_Init(SHA512_CTX *c);
+\& int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
+\& int SHA384_Final(unsigned char *md, SHA512_CTX *c);
+\& unsigned char *SHA384(const unsigned char *d, size_t n,
+\&      unsigned char *md);
+\&
+\& int SHA512_Init(SHA512_CTX *c);
+\& int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
+\& int SHA512_Final(unsigned char *md, SHA512_CTX *c);
+\& unsigned char *SHA512(const unsigned char *d, size_t n,
+\&      unsigned char *md);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+Applications should use the higher level functions
+\&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the hash
+functions directly.
+.PP
+\&\s-1SHA\-1 \s0(Secure Hash Algorithm) is a cryptographic hash function with a
+160 bit output.
+.PP
+\&\s-1\fISHA1\s0()\fR computes the \s-1SHA\-1\s0 message digest of the \fBn\fR
+bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
+\&\s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest
+is placed in a static array. Note: setting \fBmd\fR to \s-1NULL\s0 is \fBnot thread safe\fR.
+.PP
+The following functions may be used if the message is not completely
+stored in memory:
+.PP
+\&\fISHA1_Init()\fR initializes a \fB\s-1SHA_CTX\s0\fR structure.
+.PP
+\&\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
+be hashed (\fBlen\fR bytes at \fBdata\fR).
+.PP
+\&\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
+for \s-1SHA_DIGEST_LENGTH\s0 == 20 bytes of output, and erases the \fB\s-1SHA_CTX\s0\fR.
+.PP
+The \s-1SHA224, SHA256, SHA384\s0 and \s-1SHA512\s0 families of functions operate in the
+same way as for the \s-1SHA1\s0 functions. Note that \s-1SHA224\s0 and \s-1SHA256\s0 use a
+\&\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.
+The buffer \fBmd\fR must have space for the output from the \s-1SHA\s0 variant being used
+(defined by \s-1SHA224_DIGEST_LENGTH, SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH\s0 and
+\&\s-1SHA512_DIGEST_LENGTH\s0). Also note that, as for the \s-1\fISHA1\s0()\fR function above, the
+\&\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
+\&\fBmd\fR is \s-1NULL.\s0
+.PP
+The predecessor of \s-1SHA\-1, SHA,\s0 is also implemented, but it should be
+used only when backward compatibility is required.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\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
+value.
+.PP
+\&\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR and equivalent \s-1SHA224, SHA256,
+SHA384\s0 and \s-1SHA512\s0 functions return 1 for success, 0 otherwise.
+.SH "CONFORMING TO"
+.IX Header "CONFORMING TO"
+\&\s-1US\s0 Federal Information Processing Standard \s-1FIPS PUB 180\-4 \s0(Secure Hash
+Standard),
+\&\s-1ANSI X9.30\s0
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIripemd\fR\|(3), \fIhmac\fR\|(3), \fIEVP_DigestInit\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\s-1\fISHA1\s0()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
+versions of SSLeay and OpenSSL.