james/yubikey.rs
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move padding for signing to ykpiv_sign_data()

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and only pad if in_len != key_len
This commit is contained in:
Klas Lindfors
2015-06-26 11:03:08 +02:00
parent 6f5870d884
commit 642891e2b3
1 changed files with 21 additions and 15 deletions
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lib/ykpiv.c
+19 -13
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@@ -509,7 +509,7 @@ ykpiv_rc ykpiv_hex_decode(const char *hex_in, size_t in_len,
}
static ykpiv_rc _general_authenticate(ykpiv_state *state,
const unsigned char *raw_in, size_t in_len,
const unsigned char *sign_in, size_t in_len,
unsigned char *out, size_t *out_len,
unsigned char algorithm, unsigned char key, bool decipher) {
unsigned char indata[1024];
@@ -517,7 +517,6 @@ static ykpiv_rc _general_authenticate(ykpiv_state *state,
unsigned char data[1024];
unsigned char templ[] = {0, YKPIV_INS_AUTHENTICATE, algorithm, key};
unsigned long recv_len = sizeof(data);
unsigned char sign_in[256];
size_t key_len = 0;
int sw;
size_t bytes;
@@ -531,18 +530,9 @@ static ykpiv_rc _general_authenticate(ykpiv_state *state,
if(key_len == 0) {
key_len = 256;
}
if(!decipher) {
if(in_len + RSA_PKCS1_PADDING_SIZE > key_len) {
return YKPIV_SIZE_ERROR;
}
RSA_padding_add_PKCS1_type_1(sign_in, key_len, raw_in, in_len);
in_len = key_len;
} else {
if(in_len != key_len) {
return YKPIV_SIZE_ERROR;
}
memcpy(sign_in, raw_in, in_len);
}
break;
case YKPIV_ALGO_ECCP256:
key_len = 32;
@@ -555,7 +545,6 @@ static ykpiv_rc _general_authenticate(ykpiv_state *state,
} else if(decipher && in_len != (key_len * 2) + 1) {
return YKPIV_SIZE_ERROR;
}
memcpy(sign_in, raw_in, in_len);
break;
default:
return YKPIV_ALGORITHM_ERROR;
@@ -624,7 +613,24 @@ ykpiv_rc ykpiv_sign_data(ykpiv_state *state,
unsigned char *sign_out, size_t *out_len,
unsigned char algorithm, unsigned char key) {
return _general_authenticate(state, raw_in, in_len, sign_out, out_len,
unsigned char sign_in[256];
size_t key_len = 0;
if(IS_RSAKEY(algorithm)) {
key_len = 128;
if(algorithm == YKPIV_ALGO_RSA2048) {
key_len = 256;
}
}
if(IS_RSAKEY(algorithm) && key_len != in_len) {
if(in_len + RSA_PKCS1_PADDING_SIZE > key_len) {
return YKPIV_SIZE_ERROR;
}
RSA_padding_add_PKCS1_type_1(sign_in, key_len, raw_in, in_len);
in_len = key_len;
} else {
memcpy(sign_in, raw_in, in_len);
}
return _general_authenticate(state, sign_in, in_len, sign_out, out_len,
algorithm, key, false);
}