sha(3) OpenSSL sha(3) NNAAMMEE SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algorithm SSYYNNOOPPSSIISS #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); DDEESSCCRRIIPPTTIIOONN SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a 160 bit output. _S_H_A_1_(_) computes the SHA-1 message digest of the nn bytes at dd and places it in mmdd (which must have space for SHA_DIGEST_LENGTH == 20 bytes of output). If mmdd 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: _S_H_A_1___I_n_i_t_(_) initializes a SSHHAA__CCTTXX structure. _S_H_A_1___U_p_d_a_t_e_(_) can be called repeatedly with chunks of the message to be hashed (lleenn bytes at ddaattaa). _S_H_A_1___F_i_n_a_l_(_) places the message digest in mmdd, which must have space for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the SSHHAA__CCTTXX. Applications should use the higher level functions _E_V_P___D_i_g_e_s_t_I_n_i_t(3) 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. RREETTUURRNN VVAALLUUEESS _S_H_A_1_(_) returns a pointer to the hash value. _S_H_A_1___I_n_i_t_(_), _S_H_A_1___U_p_d_a_t_e_(_) and _S_H_A_1___F_i_n_a_l_(_) return 1 for success, 0 otherwise. CCOONNFFOORRMMIINNGG TTOO 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 SSEEEE AALLSSOO _r_i_p_e_m_d(3), _h_m_a_c(3), _E_V_P___D_i_g_e_s_t_I_n_i_t(3) HHIISSTTOORRYY _S_H_A_1_(_), _S_H_A_1___I_n_i_t_(_), _S_H_A_1___U_p_d_a_t_e_(_) and _S_H_A_1___F_i_n_a_l_(_) are available in all versions of SSLeay and OpenSSL. 1.0.1u 2016-09-22 sha(3)