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=pod =head1 NAME SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algorithm =head1 SYNOPSIS #include unsigned char *SHA1(const unsigned char *d, unsigned long n, unsigned char *md); int SHA1_Init(SHA_CTX *c); int SHA1_Update(SHA_CTX *c, const void *data, unsigned long len); int SHA1_Final(unsigned char *md, SHA_CTX *c); =head1 DESCRIPTION SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a 160 bit output. SHA1() computes the SHA-1 message digest of the B bytes at B and places it in B (which must have space for SHA_DIGEST_LENGTH == 20 bytes of output). If B is NULL, the digest is placed in a static array. The following functions may be used if the message is not completely stored in memory: SHA1_Init() initializes a B structure. SHA1_Update() can be called repeatedly with chunks of the message to be hashed (B bytes at B). SHA1_Final() places the message digest in B, which must have space for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the B. Applications should use the higher level functions L etc. instead of calling the hash functions directly. The predecessor of SHA-1, SHA, is also implemented, but it should be used only when backward compatibility is required. =head1 RETURN VALUES SHA1() returns a pointer to the hash value. SHA1_Init(), SHA1_Update() and SHA1_Final() return 1 for success, 0 otherwise. =head1 CONFORMING TO SHA: US Federal Information Processing Standard FIPS PUB 180 (Secure Hash Standard), SHA-1: US Federal Information Processing Standard FIPS PUB 180-1 (Secure Hash Standard), ANSI X9.30 =head1 SEE ALSO L, L, L =head1 HISTORY SHA1(), SHA1_Init(), SHA1_Update() and SHA1_Final() are available in all versions of SSLeay and OpenSSL. =cut