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crypto.c: refactor extract_private_key to utils,c

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F. Duncanh
2023-11-28 18:20:12 -05:00
parent a60d4d8f74
commit c2153d2af0
3 changed files with 122 additions and 30 deletions
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54
lib/utils.c
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@@ -196,6 +196,60 @@ char *utils_pk_to_string(const unsigned char *pk, int pk_len) {
return pk_str;
}
int
private_key_from_EVP_PKEY_print_private(unsigned char *privkey, int keylen, char *data) {
int count = 0;
unsigned int val;
unsigned int part1 = 0;
int part = 0;
unsigned char start[4] = { 0x20, 0x20, 0x20, 0x20 };
/* data must be output of EVP_PKEY_print_private */
for (int i = 0; i < strlen(data); i ++ ) {
if (memcmp(data, start, 4)) {
data ++;
} else {
data += 4;
break;
}
}
int datalen = strlen(data);
for (int i = 0; (count < keylen && i < datalen); i++) {
val = 64;
if ('0' <= *data && *data <= '9') val = *data - '0';
if ('a' <= *data && *data <= 'f') val = 10 + *data - 'a';
if ('A' <= *data && *data <= 'F') val = 10 + *data - 'A';
if (val == 64) {
data++;
continue;
}
part++;
part = part% 2;
switch (part) {
case 1:
part1 = val;
data++;
break;
case 0:
privkey[count] = (unsigned char) (val + (part1 << 4));
count++;
data++;
break;
default:
break;
}
}
if (count != keylen) goto error;
return 0;
error:;
memset(privkey, 0, keylen);
return -1;
}
char *utils_data_to_string(const unsigned char *data, int datalen, int chars_per_line) {
assert(datalen >= 0);
assert(chars_per_line > 0);