sv-scheme.h File Reference

Header file containing the functions to implement the base SV-Scheme. More...

#include <pbc/pbc.h>
#include <nettle/sha1.h>
#include "shared.h"

Go to the source code of this file.

Functions
void	p_sign (proxy_signature_t p_sig, element_t k_sign, delegation_t w, const uint8_t msg[], size_t msg_size, sv_public_params_t public_p)
	The proxy signer signs a message m. After choosing a random k in Zq*, the proxy signer computes the following values: More...
uint16_t	sign_verify (uint8_t msg[], proxy_signature_t p_sig, sv_public_params_t public_p)
	Checks if the proxy signature is valid. If so, the original message m is returned. More...

Detailed Description

Header file containing the functions to implement the base SV-Scheme.

Author

TendTo (https://github.com/TendTo)

Function Documentation

p_sign()

void p_sign	(	proxy_signature_t	p_sig,
		element_t	k_sign,
		delegation_t	w,
		const uint8_t	msg[],
		size_t	msg_size,
		sv_public_params_t	public_p
	)

The proxy signer signs a message m. After choosing a random k in Zq*, the proxy signer computes the following values:

• r = e(P, P)^k
• v = ra * rb
• beta = F1(m)||(F2(F1(m))(+)m)
• alpha = [beta]10
• Vb = H2(v) + alpha
• U = k * P + d

Parameters

p_sig	proxy signature to be created.
k_sign	proxy signing key of the proxy signer.
w	delegation from the original user to the proxy signer that validates the proxy signing key.
msg	message to be signed.
msg_size	size of the message to be signed in bytes.
public_p	All the public parameters of the scheme.

sign_verify()

uint16_t sign_verify	(	uint8_t	msg[],
		proxy_signature_t	p_sig,
		sv_public_params_t	public_p
	)

Checks if the proxy signature is valid. If so, the original message m is returned.

Parameters

msg	message recovered from the proxy signature. The buffer must be l2 bytes long.
ps	proxy signature to be verified.
public_p	All the public parameters of the scheme.