sunrpc/auth_gss/gss_krb5_keys.c

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74  * @inbits: number of bits in @in
75  * @in: buffer containing input to fold
76  * @outbits: number of bits in the output buffer
79  * This is the n-fold function as described in rfc3961, sec 5.1
83 void krb5_nfold(u32 inbits, const u8 *in, u32 outbits, u8 *out)
105 		/* compute the msbit in k which gets added into this byte */
107 			/* first, start with the msbit in the first,
119 		byte += (((in[((inbits - 1) - (msbit >> 3)) % inbits] << 8)|
120 				  (in[((inbits) - (msbit >> 3)) % inbits]))
132 	/* if there's a carry bit left over, add it back in */
147  * This is the DK (derive_key) function as described in rfc3961, sec 5.1
264  * On success, returns 0 and fills in @outkey. A negative errno value
293  *       in big-endian order.
298  *    k: The length of the output key in bits, represented as a 4-byte
299  *       string in big-endian order.
301  * Caller fills in K(i-1) in @step, and receives the result K(i)
302  * in the same buffer.
353  * "We use a key derivation function from the family specified in
354  *  [SP800-108], Section 5.2, 'KDF in Feedback Mode'."
364  * On success, returns 0 and fills in @outkey. A negative errno value
440  *    k: Length in bits of the key to be outputted, expressed in
441  *    big-endian binary representation in 4 bytes.
496  * On success, returns 0 and fills in @outkey. A negative errno value