VeriFone MX800 Series - Sha1()

DEVICE DRIVERS
SHA1()
84 M
X
800 SERIES PROGRAMMERS GUIDE
SHA1()
This function performs a SHA-1 computation as described in FIPS PUB 180-2. It
returns a 20-byte message digest. Due to the underlying messaging interface, it
can process a maximum of 1024 bytes per call.
Prototype
int SHA1 (unsigned char * int option, unsigned char * input_buffer,
unsigned long nb, unsigned char * sha20)
Parameters
Return Values
option
input_buffer Pointer to the input buffer holding the message to be processed.
nb Number of bytes in the buffer. Maximum value is 1024.
sha20 Pointer to the 20-byte buffer where the message digest will be
transferred.
0 Successful execution
< 0 Error
SHA1INIT First call. The SHA-1 engine is initialized before
processing the data. No digest is returned.
SHA1BUFF Intermediate call. It feeds the SHA-1 engine more
data. No digest is returned.
SHA1TERM Final call. The 20-byte digest is returned after the
data is processed.
SHA1ALL One-step operation combining all the options
above.