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make use of the pkcs1 plugin in gcrypt rsa key parsing

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This commit is contained in:
Martin Willi
2009-08-26 11:23:50 +02:00
parent 3044774323
commit 4e3d1e804e
2 changed files with 75 additions and 189 deletions
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src/libstrongswan/plugins/gcrypt/gcrypt_rsa_private_key.c
+54 -123
View File
@@ -565,101 +565,14 @@ static gcrypt_rsa_private_key_t *generate(size_t key_size)
}
/**
* ASN.1 definition of a PKCS#1 RSA private key
* Load a private key from components
*/
static const asn1Object_t privkeyObjects[] = {
{ 0, "RSAPrivateKey", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */
{ 1, "version", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "modulus", ASN1_INTEGER, ASN1_BODY }, /* 2 */
{ 1, "publicExponent", ASN1_INTEGER, ASN1_BODY }, /* 3 */
{ 1, "privateExponent", ASN1_INTEGER, ASN1_BODY }, /* 4 */
{ 1, "prime1", ASN1_INTEGER, ASN1_BODY }, /* 5 */
{ 1, "prime2", ASN1_INTEGER, ASN1_BODY }, /* 6 */
{ 1, "exponent1", ASN1_INTEGER, ASN1_BODY }, /* 7 */
{ 1, "exponent2", ASN1_INTEGER, ASN1_BODY }, /* 8 */
{ 1, "coefficient", ASN1_INTEGER, ASN1_BODY }, /* 9 */
{ 1, "otherPrimeInfos", ASN1_SEQUENCE, ASN1_OPT |
ASN1_LOOP }, /* 10 */
{ 2, "otherPrimeInfo", ASN1_SEQUENCE, ASN1_NONE }, /* 11 */
{ 3, "prime", ASN1_INTEGER, ASN1_BODY }, /* 12 */
{ 3, "exponent", ASN1_INTEGER, ASN1_BODY }, /* 13 */
{ 3, "coefficient", ASN1_INTEGER, ASN1_BODY }, /* 14 */
{ 1, "end opt or loop", ASN1_EOC, ASN1_END }, /* 15 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PRIV_KEY_VERSION 1
#define PRIV_KEY_MODULUS 2
#define PRIV_KEY_PUB_EXP 3
#define PRIV_KEY_PRIV_EXP 4
#define PRIV_KEY_PRIME1 5
#define PRIV_KEY_PRIME2 6
#define PRIV_KEY_EXP1 7
#define PRIV_KEY_EXP2 8
#define PRIV_KEY_COEFF 9
/**
* load private key from a ASN1 encoded blob
*/
static gcrypt_rsa_private_key_t *load(chunk_t blob)
static gcrypt_rsa_private_key_t *load(chunk_t n, chunk_t e, chunk_t d,
chunk_t p, chunk_t q, chunk_t u)
{
private_gcrypt_rsa_private_key_t *this;
asn1_parser_t *parser;
chunk_t object;
int objectID ;
bool success = FALSE;
chunk_t n, e, d, u, p, q;
gcry_error_t err;
private_gcrypt_rsa_private_key_t *this = gcrypt_rsa_private_key_create_empty();
n = e = d = u = p = q = chunk_empty;
parser = asn1_parser_create(privkeyObjects, blob);
parser->set_flags(parser, FALSE, TRUE);
while (parser->iterate(parser, &objectID, &object))
{
switch (objectID)
{
case PRIV_KEY_VERSION:
if (object.len > 0 && *object.ptr != 0)
{
goto end;
}
break;
case PRIV_KEY_MODULUS:
n = object;
break;
case PRIV_KEY_PUB_EXP:
e = object;
break;
case PRIV_KEY_PRIV_EXP:
d = object;
break;
case PRIV_KEY_PRIME1:
/* p and q are swapped, as gcrypt expects p < q */
q = object;
break;
case PRIV_KEY_PRIME2:
p = object;
break;
case PRIV_KEY_EXP1:
case PRIV_KEY_EXP2:
break;
case PRIV_KEY_COEFF:
u = object;
break;
}
}
success = parser->success(parser);
end:
parser->destroy(parser);
if (!success)
{
return NULL;
}
this = gcrypt_rsa_private_key_create_empty();
err = gcry_sexp_build(&this->key, NULL,
"(private-key(rsa(n %b)(e %b)(d %b)(p %b)(q %b)(u %b)))",
n.len, n.ptr, e.len, e.ptr, d.len, d.ptr,
@@ -693,8 +606,10 @@ typedef struct private_builder_t private_builder_t;
struct private_builder_t {
/** implements the builder interface */
builder_t public;
/** loaded/generated private key */
gcrypt_rsa_private_key_t *key;
/** key size, if generating */
u_int key_size;
/** rsa key parameters */
chunk_t n, e, d, p, q, u;
};
/**
@@ -702,8 +617,16 @@ struct private_builder_t {
*/
static gcrypt_rsa_private_key_t *build(private_builder_t *this)
{
gcrypt_rsa_private_key_t *key = this->key;
gcrypt_rsa_private_key_t *key = NULL;
if (this->key_size)
{
key = generate(this->key_size);
}
else
{
key = load(this->n, this->e, this->d, this->p, this->q, this->u);
}
free(this);
return key;
}
@@ -713,35 +636,42 @@ static gcrypt_rsa_private_key_t *build(private_builder_t *this)
*/
static void add(private_builder_t *this, builder_part_t part, ...)
{
if (!this->key)
va_list args;
va_start(args, part);
switch (part)
{
va_list args;
switch (part)
{
case BUILD_BLOB_ASN1_DER:
{
va_start(args, part);
this->key = load(va_arg(args, chunk_t));
va_end(args);
return;
}
case BUILD_KEY_SIZE:
{
va_start(args, part);
this->key = generate(va_arg(args, u_int));
va_end(args);
return;
}
default:
break;
}
case BUILD_KEY_SIZE:
this->key_size = va_arg(args, u_int);
return;
case BUILD_RSA_MODULUS:
this->n = va_arg(args, chunk_t);
break;
case BUILD_RSA_PUB_EXP:
this->e = va_arg(args, chunk_t);
break;
case BUILD_RSA_PRIV_EXP:
this->d = va_arg(args, chunk_t);
break;
case BUILD_RSA_PRIME1:
/* swap p and q, gcrypt expects p < q */
this->q = va_arg(args, chunk_t);
break;
case BUILD_RSA_PRIME2:
this->p = va_arg(args, chunk_t);
break;
case BUILD_RSA_EXP1:
case BUILD_RSA_EXP2:
/* not required for gcrypt */
break;
case BUILD_RSA_COEFF:
this->u = va_arg(args, chunk_t);
break;
default:
builder_cancel(&this->public);
break;
}
if (this->key)
{
destroy((private_gcrypt_rsa_private_key_t*)this->key);
}
builder_cancel(&this->public);
va_end(args);
}
/**
@@ -758,7 +688,8 @@ builder_t *gcrypt_rsa_private_key_builder(key_type_t type)
this = malloc_thing(private_builder_t);
this->key = NULL;
this->key_size = 0;
this->n = this->e = this->d = this->p = this->q = this->u = chunk_empty;
this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
this->public.build = (void*(*)(builder_t *this))build;
src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c
+21 -66
View File
@@ -375,53 +375,13 @@ public_key_t *gcrypt_rsa_public_key_create_from_sexp(gcry_sexp_t key)
}
/**
* ASN.1 definition of RSApublicKey
* Load a public key from components
*/
static const asn1Object_t pubkeyObjects[] = {
{ 0, "RSAPublicKey", ASN1_SEQUENCE, ASN1_OBJ }, /* 0 */
{ 1, "modulus", ASN1_INTEGER, ASN1_BODY }, /* 1 */
{ 1, "publicExponent", ASN1_INTEGER, ASN1_BODY }, /* 2 */
{ 0, "exit", ASN1_EOC, ASN1_EXIT }
};
#define PUB_KEY_RSA_PUBLIC_KEY 0
#define PUB_KEY_MODULUS 1
#define PUB_KEY_EXPONENT 2
/**
* Load a public key from an ASN1 encoded blob
*/
static gcrypt_rsa_public_key_t *load(chunk_t blob)
static gcrypt_rsa_public_key_t *load(chunk_t n, chunk_t e)
{
private_gcrypt_rsa_public_key_t *this;
asn1_parser_t *parser;
chunk_t object, n, e;
int objectID;
bool success = FALSE;
gcry_error_t err;
n = e = chunk_empty;
parser = asn1_parser_create(pubkeyObjects, blob);
while (parser->iterate(parser, &objectID, &object))
{
switch (objectID)
{
case PUB_KEY_MODULUS:
n = object;
break;
case PUB_KEY_EXPONENT:
e = object;
break;
}
}
success = parser->success(parser);
parser->destroy(parser);
if (!success)
{
return NULL;
}
this = gcrypt_rsa_public_key_create_empty();
err = gcry_sexp_build(&this->key, NULL, "(public-key(rsa(n %b)(e %b)))",
n.len, n.ptr, e.len, e.ptr);
@@ -446,8 +406,8 @@ typedef struct private_builder_t private_builder_t;
struct private_builder_t {
/** implements the builder interface */
builder_t public;
/** loaded public key */
gcrypt_rsa_public_key_t *key;
/** rsa key parameters */
chunk_t n, e;
};
/**
@@ -455,8 +415,9 @@ struct private_builder_t {
*/
static gcrypt_rsa_public_key_t *build(private_builder_t *this)
{
gcrypt_rsa_public_key_t *key = this->key;
gcrypt_rsa_public_key_t *key;
key = load(this->n, this->e);
free(this);
return key;
}
@@ -466,28 +427,22 @@ static gcrypt_rsa_public_key_t *build(private_builder_t *this)
*/
static void add(private_builder_t *this, builder_part_t part, ...)
{
if (!this->key)
va_list args;
va_start(args, part);
switch (part)
{
va_list args;
switch (part)
{
case BUILD_BLOB_ASN1_DER:
{
va_start(args, part);
this->key = load(va_arg(args, chunk_t));
va_end(args);
return;
}
default:
break;
}
case BUILD_RSA_MODULUS:
this->n = va_arg(args, chunk_t);
break;
case BUILD_RSA_PUB_EXP:
this->e = va_arg(args, chunk_t);
break;
default:
builder_cancel(&this->public);
break;
}
if (this->key)
{
destroy((private_gcrypt_rsa_public_key_t*)this->key);
}
builder_cancel(&this->public);
va_end(args);
}
/**
@@ -504,7 +459,7 @@ builder_t *gcrypt_rsa_public_key_builder(key_type_t type)
this = malloc_thing(private_builder_t);
this->key = NULL;
this->n = this->e = chunk_empty;
this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
this->public.build = (void*(*)(builder_t *this))build;