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GNU/Linux |
CentOS 5.4 |
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SHA1_Init(3ssl) |
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SHA1, SHA1_Init, SHA1_Update, SHA1_Final − Secure Hash Algorithm
#include <openssl/sha.h>
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);
SHA−1 (Secure Hash Algorithm) is a cryptographic hash function with a 160 bit output.
SHA1 () computes the SHA−1 message digest of the n bytes at d and places it in md (which must have space for SHA_DIGEST_LENGTH == 20 bytes of output). If md 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 SHA_CTX structure.
SHA1_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).
SHA1_Final() places the message digest in md, which must have space for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the SHA_CTX .
Applications should use the higher level functions EVP_DigestInit(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.
SHA1 () returns a pointer to the hash value.
SHA1_Init(), SHA1_Update() and SHA1_Final() return 1 for success, 0 otherwise.
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
ripemd(3), hmac(3), EVP_DigestInit(3)
SHA1 (), SHA1_Init(), SHA1_Update() and SHA1_Final() are available in all versions of SSLeay and OpenSSL.
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SHA1_Init(3ssl) | |