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securityd — Security context daemon for Authorization and cryptographic
securityd maintains security contexts and arbitrates cryptographic opera-
tions and Security Authorizations. Access to keychain items is routed
through securityd to enforce access controls and to keep private keys out
of user process address space. Authorization calls also communicate with
securityd to enforce rules contained in the /etc/authorization database.
All user interaction with securityd is mediated through the Security
This command is not intended to be invoked directly.
securityd was first introduced in Mac OS X version 10.0 (Cheetah) as the
« Security Server » and was renamed in 10.4 (Panther).
SHA1, SHA1_Init, SHA1_Update, SHA1_Final – Secure Hash Algorithm
unsigned char *SHA1(const unsigned char *d, unsigned long n,
unsigned char *md);
void SHA1_Init(SHA_CTX *c);
void SHA1_Update(SHA_CTX *c, const void *data,
unsigned long len);
void 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() do not return values.
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