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Added function to return a string representation of the next handshake action #32

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Added function to return a string representation of the next handshake action #32

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3 changes: 2 additions & 1 deletion include/noise/protocol/handshakestate.h
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,8 @@ int noise_handshakestate_split
(NoiseHandshakeState *state, NoiseCipherState **send, NoiseCipherState **receive);
int noise_handshakestate_get_handshake_hash
(const NoiseHandshakeState *state, uint8_t *hash, size_t max_len);

int noise_handshakestate_get_action_pattern
(const NoiseHandshakeState *state, char *pattern, size_t max_len);
#ifdef __cplusplus
};
#endif
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95 changes: 95 additions & 0 deletions src/protocol/handshakestate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1779,4 +1779,99 @@ int noise_handshakestate_get_handshake_hash
return NOISE_ERROR_NONE;
}


int noise_handshakestate_get_action_pattern
(const NoiseHandshakeState *state, char *pattern, size_t max_len)
{
uint8_t token = 0;
int err = NOISE_ERROR_NONE;
int p = 0;
int t = 0;

for (;;) {
token = *(state->tokens + t);
if (token == NOISE_TOKEN_END) {
break;
} else if (token == NOISE_TOKEN_FLIP_DIR) {
break;
}
if (p != 0) {
if (max_len - p > 1) {
pattern[p++] = ',';
}
}

/* Process the token */
switch (token) {
case NOISE_TOKEN_E:
if (max_len - p > 1) {
pattern[p++] = 'e';
}
break;
case NOISE_TOKEN_S:
if (max_len - p > 1) {
pattern[p++] = 's';
}
break;
case NOISE_TOKEN_EE:
if (max_len - p > 1) {
pattern[p++] = 'e';
}
if (max_len - p > 1) {
pattern[p++] = 'e';
}
break;
case NOISE_TOKEN_ES:
if (max_len - p > 1) {
pattern[p++] = 'e';
}
if (max_len - p > 1) {
pattern[p++] = 's';
}
break;
case NOISE_TOKEN_SE:
if (max_len - p > 1) {
pattern[p++] = 's';
}
if (max_len - p > 1) {
pattern[p++] = 'e';
}
break;
case NOISE_TOKEN_SS:
if (max_len - p > 1) {
pattern[p++] = 's';
}
if (max_len - p > 1) {
pattern[p++] = 's';
}
break;
case NOISE_TOKEN_F:
if (max_len - p > 1) {
pattern[p++] = 'f';
}
break;
case NOISE_TOKEN_FF:
if (max_len - p > 1) {
pattern[p++] = 'f';
}
if (max_len - p > 1) {
pattern[p++] = 'f';
}
break;
default:
err = NOISE_ERROR_INVALID_STATE;
break;
}
if (err != NOISE_ERROR_NONE) {
return err;
}
t++;
}

if (max_len - p > 0) {
pattern[p++] = '\0';
}
return err;
}

/**@}*/