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fixed OpenPGPv3 fingerprint computation

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This commit is contained in:
Andreas Steffen
2009-06-09 11:03:33 +02:00
committed by Martin Willi
parent d17a120598
commit 1bb4d7dd79
1 changed files with 19 additions and 7 deletions
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src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c
+19 -7
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@@ -371,21 +371,33 @@ static size_t get_keysize(private_gmp_rsa_public_key_t *this)
static identification_t* gmp_rsa_build_pgp_v3_keyid(mpz_t n, mpz_t e)
{
identification_t *keyid;
chunk_t modulus, exponent, hash;
chunk_t modulus, mod, exponent, exp, hash;
hasher_t *hasher;
hasher= lib->crypto->create_hasher(lib->crypto, HASH_MD5);
if (hasher == NULL)
{
DBG1("computation of PGP V3 key ID failed, no MD5 hasher is available");
DBG1("computation of PGP V3 keyid failed, no MD5 hasher is available");
return NULL;
}
modulus = gmp_mpz_to_chunk(n);
exponent = gmp_mpz_to_chunk(e);
hasher->allocate_hash(hasher, modulus, NULL);
hasher->allocate_hash(hasher, exponent, &hash);
mod = modulus = gmp_mpz_to_chunk(n);
exp = exponent = gmp_mpz_to_chunk(e);
/* remove leading zero bytes before hashing modulus and exponent */
while (mod.len > 0 && *mod.ptr == 0x00)
{
mod.ptr++;
mod.len--;
}
while (exp.len > 0 && *exp.ptr == 0x00)
{
exp.ptr++;
exp.len--;
}
hasher->allocate_hash(hasher, mod, NULL);
hasher->allocate_hash(hasher, exp, &hash);
hasher->destroy(hasher);
keyid = identification_create_from_encoding(ID_PUBKEY_SHA1, hash);
keyid = identification_create_from_encoding(ID_KEY_ID, hash);
free(hash.ptr);
free(modulus.ptr);
free(exponent.ptr);