Hi, This is regarding the hash computation over a file with AF_ALG from user space. [without OpenSSL] The following link has the mail from Herbert with subject : "RFC: Crypto API User-interface" http://lwn.net/Articles/410848/ I was trying to take help from the code snippet he has put in his mail and I was doing the following to compute hash over a file of 16 bytes. The file contents are "123456789012345\n". I read the first 10 bytes first and computed hash over it. Then I read the next 6 bytes from the file and computed the hash and I had taken care of using the flags MSG_MORE and MSG_OOB. Following is what I am doing: 1. send(opfd, sbuf, len, MSG_MORE); 2. read(opfd, state, 20); 3. send(opfd, state, 20, MSG_OOB); 4. send(opfd, sbuf, len, MSG_MORE); 5. read(opfd, state, 20); 6. /*restore from a partial hash state */ 7. send(opfd, state, 20, MSG_OOB); 8. /* finalize */ 9. send(opfd, sbuf, 0, 0); 10. read(opfd, buf, 20); sbuf in line 1 contains: "1234567890" (the " is not part of the data, the data is plain 10 ascii bytes for 1 through 9), len is 10. the state after line 2 contains correct hash of the above data. sbuf in line 4 contains: "12345\n". Len is 6. The hash I am seeing in buf after line 10 is not correct one. Is there anything obviously wrong with the above code? I am using 2.6.39.4 kernel on rhel 6.4 (santiago) Thanks for the help! ~Jitendra -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
