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openssl_stub.c
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/* -------------------------------------------------------------------- */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include <caml/alloc.h>
#include <caml/callback.h>
#include <caml/custom.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/mlvalues.h>
#ifndef NO_OPENSSL
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/dsa.h>
#include <openssl/dh.h>
#include <openssl/pem.h>
#include <openssl/ec.h>
#include <openssl/objects.h>
#include <openssl/obj_mac.h>
/* -------------------------------------------------------------------- */
static value Val_some(value mlvalue) {
CAMLparam1(mlvalue);
CAMLlocal1(aout);
aout = caml_alloc(1, 0);
Store_field(aout, 0, mlvalue);
CAMLreturn(aout);
}
#define Val_none Val_int(0)
#define Some_val(v) Field(v,0)
static uint8_t* buffer_of_platform_bytes(value mlbytes, size_t* out_length) {
*out_length = caml_string_length(mlbytes);
uint8_t *buf = (uint8_t*)malloc(*out_length);
memcpy(buf, String_val(mlbytes), *out_length);
return buf;
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_openssl_init(value unit) {
CAMLparam1(unit);
OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ADD_ALL_CIPHERS | OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
CONF_modules_load(NULL, "CoreCrypto", 0);
RAND_poll();
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
#define MD_val(v) (*((const EVP_MD**) Data_custom_val(v)))
static struct custom_operations evp_md_ops = {
.identifier = "ocaml_evp_md",
.finalize = custom_finalize_default,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
/* -------------------------------------------------------------------- */
#define EVP_MD_GEN(X) \
CAMLprim value ocaml_EVP_MD_##X(value unit) { \
CAMLparam1(unit); \
CAMLlocal1(aout); \
\
aout = caml_alloc_custom(&evp_md_ops, sizeof(EVP_MD*), 0, 1); \
MD_val(aout) = EVP_##X(); \
\
CAMLreturn(aout); \
}
EVP_MD_GEN(md_null);
EVP_MD_GEN(md5);
EVP_MD_GEN(sha1);
EVP_MD_GEN(sha224);
EVP_MD_GEN(sha256);
EVP_MD_GEN(sha384);
EVP_MD_GEN(sha512);
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_MD_block_size(value md) {
CAMLparam1(md);
CAMLreturn(Val_int(EVP_MD_block_size(MD_val(md))));
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_MD_size(value md) {
CAMLparam1(md);
CAMLreturn(Val_int(EVP_MD_size(MD_val(md))));
}
/* -------------------------------------------------------------------- */
#define MD_CTX_val(v) (*((EVP_MD_CTX**) Data_custom_val(v)))
static void ocaml_evp_md_ctx_finalize(value mlctx) {
EVP_MD_CTX *ctx = MD_CTX_val(mlctx);
if (ctx != NULL)
EVP_MD_CTX_free(ctx);
}
static struct custom_operations evp_md_ctx_ops = {
.identifier = "ocaml_evp_md_ctx",
.finalize = ocaml_evp_md_ctx_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_MD_CTX_new(value md) {
EVP_MD_CTX *ctx = NULL;
CAMLparam1(md);
CAMLlocal1(mlctx);
mlctx = caml_alloc_custom(&evp_md_ctx_ops, sizeof(EVP_MD_CTX*), 0, 1);
if ((ctx = EVP_MD_CTX_new()) == NULL)
caml_failwith("cannot alloc EVP_MD_CTX structure");
if (EVP_DigestInit_ex(ctx, MD_val(md), NULL) == 0) {
EVP_MD_CTX_free(ctx);
caml_failwith("cannot initialize EVP_MD_CTX structure");
}
MD_CTX_val(mlctx) = ctx;
CAMLreturn(mlctx);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_MD_CTX_fini(value mlctx) {
EVP_MD_CTX *ctx = NULL;
CAMLparam1(mlctx);
if ((ctx = MD_CTX_val(mlctx)) != NULL) {
EVP_MD_CTX_free(ctx);
MD_CTX_val(mlctx) = NULL;
}
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_MD_CTX_update(value mlctx, value mldata) {
EVP_MD_CTX *ctx = NULL;
CAMLparam2(mlctx, mldata);
if ((ctx = MD_CTX_val(mlctx)) == NULL)
caml_invalid_argument("MD_CTX has been disposed");
EVP_DigestUpdate(ctx, String_val(mldata), caml_string_length(mldata));
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_MD_CTX_final(value mlctx) {
EVP_MD_CTX *ctx = NULL;
CAMLparam1(mlctx);
CAMLlocal1(aout);
if ((ctx = MD_CTX_val(mlctx)) == NULL)
caml_invalid_argument("MD_CTX has been disposed");
aout = caml_alloc_string(EVP_MD_CTX_size(ctx));
(void) EVP_DigestFinal_ex(ctx, (uint8_t*) String_val(aout), NULL);
EVP_MD_CTX_free(ctx);
MD_CTX_val(mlctx) = NULL;
CAMLreturn(aout);
}
/* -------------------------------------------------------------------- */
#define CIPHER_val(v) (*((const EVP_CIPHER**) Data_custom_val(v)))
static struct custom_operations evp_cipher_ops = {
.identifier = "ocaml_evp_cipher",
.finalize = custom_finalize_default,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
/* -------------------------------------------------------------------- */
#define EVP_CIPHER_GEN(X) \
CAMLprim value ocaml_EVP_CIPHER_##X(value unit) { \
CAMLparam1(unit); \
CAMLlocal1(cipher); \
\
cipher = caml_alloc_custom(&evp_cipher_ops, sizeof(EVP_CIPHER*), 0, 1); \
CIPHER_val(cipher) = EVP_##X(); \
\
CAMLreturn(cipher); \
}
EVP_CIPHER_GEN(des_ede3);
EVP_CIPHER_GEN(des_ede3_cbc);
EVP_CIPHER_GEN(aes_128_ecb);
EVP_CIPHER_GEN(aes_128_cbc);
EVP_CIPHER_GEN(aes_256_ecb);
EVP_CIPHER_GEN(aes_256_cbc);
EVP_CIPHER_GEN(aes_128_gcm);
EVP_CIPHER_GEN(aes_256_gcm);
EVP_CIPHER_GEN(chacha20_poly1305);
EVP_CIPHER_GEN(rc4);
/* -------------------------------------------------------------------- */
#define CIPHER_CTX_val(v) (*((EVP_CIPHER_CTX**) Data_custom_val(v)))
static void ocaml_evp_cipher_finalize(value mlctx) {
EVP_CIPHER_CTX *ctx = CIPHER_CTX_val(mlctx);
if (ctx != NULL) {
EVP_CIPHER_CTX_reset(ctx);
EVP_CIPHER_CTX_free(ctx);
}
}
static struct custom_operations evp_cipher_ctx_ops = {
.identifier = "ocaml_evp_cipher_ctx",
.finalize = ocaml_evp_cipher_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_create(value cipher, value forenc) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam2(cipher, forenc);
CAMLlocal1(mlctx);
mlctx = caml_alloc_custom(&evp_cipher_ctx_ops, sizeof(EVP_CIPHER_CTX*), 0, 1);
if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
caml_failwith("cannot alloc EVP_CIPHER_CTX structure");
EVP_CIPHER_CTX_reset(ctx);
// Set all parameters to NULL except the cipher type in this initial call
// Give remaining parameters in subsequent calls (e.g. EVP_CIPHER_set_key),
// all of which have cipher type set to NULL
if (EVP_CipherInit_ex(ctx, CIPHER_val(cipher), NULL, NULL, NULL, Bool_val(forenc)) == 0) {
EVP_CIPHER_CTX_reset(ctx);
EVP_CIPHER_CTX_free(ctx);
caml_failwith("cannot initialize cipher context");
}
// Disable padding: total amount of data encrypted or decrypted must be a
// multiple of the block size or an error will occur
EVP_CIPHER_CTX_set_padding(ctx, 0);
CIPHER_CTX_val(mlctx) = ctx;
CAMLreturn(mlctx);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_fini(value mlctx) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam1(mlctx);
if ((ctx = CIPHER_CTX_val(mlctx)) != NULL) {
EVP_CIPHER_CTX_reset(ctx);
EVP_CIPHER_CTX_free(ctx);
CIPHER_CTX_val(mlctx) = NULL;
}
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_block_size(value mlctx) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam1(mlctx);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
CAMLreturn(Val_int(EVP_CIPHER_CTX_block_size(ctx)));
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_key_length(value mlctx) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam1(mlctx);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
CAMLreturn(Val_int(EVP_CIPHER_CTX_key_length(ctx)));
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_iv_length(value mlctx) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam1(mlctx);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
CAMLreturn(Val_int(EVP_CIPHER_CTX_iv_length(ctx)));
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_set_key(value mlctx, value key) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam2(mlctx, key);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
if (EVP_CIPHER_CTX_set_key_length(ctx, caml_string_length(key)) == 0)
caml_failwith("cannot set CIPHER_CTX key (set_key_length)");
if (EVP_CipherInit_ex(ctx, NULL, NULL, (uint8_t*) String_val(key), NULL, -1) == 0)
caml_failwith("cannot set CIPHER_CTX_key");
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_set_iv(value mlctx, value iv, value variable_iv_length) {
EVP_CIPHER_CTX *ctx = NULL;
CAMLparam3(mlctx, iv, variable_iv_length);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
ERR_clear_error();
if(Bool_val(variable_iv_length) && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, caml_string_length(iv), NULL) != 1) {
unsigned long err = ERR_peek_last_error();
char* err_string = ERR_error_string(err, NULL);
caml_failwith(err_string);
}
if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, (uint8_t*) String_val(iv), -1) == 0)
caml_failwith("cannot set CIPHER_CTX_iv");
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_set_tag(value mlctx, value tag) {
EVP_CIPHER_CTX *ctx = NULL;
int olen = 0;
int tlen = 0;
CAMLparam2(mlctx, tag);
CAMLlocal1(output);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
// Hardcoded tag length for AES-{128,256}-GCM, may need to be revised to
// support other ciphers
tlen = 16;
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, tlen, String_val(tag)) != 1)
caml_failwith("failed to set AEAD tag");
olen = EVP_MAX_BLOCK_LENGTH;
output = caml_alloc_string(olen);
if ((EVP_DecryptFinal_ex(ctx, (uint8_t*) output, &olen) != 1) || (olen != 0))
CAMLreturn(Val_false);
// caml_failwith("ciphertext and/or additional data authentication failed");
CAMLreturn(Val_true);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_get_tag(value mlctx) {
EVP_CIPHER_CTX *ctx = NULL;
int olen = 0;
int tlen = 0;
CAMLparam1(mlctx);
CAMLlocal2(output, tag);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
olen = EVP_MAX_BLOCK_LENGTH;
output = caml_alloc_string(olen);
if ((EVP_EncryptFinal_ex(ctx, (uint8_t*) output, &olen) != 1) || (olen != 0))
caml_failwith("final encryption failed");
// Hardcoded tag length for AES-{128,256}-GCM, may need to be revised to
// support other ciphers
tlen = 16;
tag = caml_alloc_string(tlen);
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, tlen, (uint8_t*) tag) != 1)
caml_failwith("failed to get AEAD tag");
CAMLreturn(tag);
}
/* ------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_CIPHER_CTX_process(value mlctx, value data) {
EVP_CIPHER_CTX *ctx = NULL;
int olen = 0;
CAMLparam2(mlctx, data);
CAMLlocal1(output);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
if (caml_string_length(data) % EVP_CIPHER_CTX_block_size(ctx) != 0)
caml_failwith("partial block encryption/decryption not supported");
olen = caml_string_length(data);
output = caml_alloc_string(olen);
if (EVP_CipherUpdate(ctx, (uint8_t*) output, &olen, (uint8_t*) String_val(data), olen) == 0)
caml_failwith("encryption/decryption failed");
if ((size_t) olen != caml_string_length(data))
caml_failwith("EVP_CIPHER_CTX_process(): internal error");
CAMLreturn(output);
}
CAMLprim value ocaml_EVP_CIPHER_CTX_set_additional_data(value mlctx, value data) {
EVP_CIPHER_CTX *ctx = NULL;
int olen = 0;
CAMLparam2(mlctx, data);
CAMLlocal1(output);
if ((ctx = CIPHER_CTX_val(mlctx)) == NULL)
caml_failwith("CIPHER_CTX has been disposed");
olen = caml_string_length(data);
output = caml_alloc_string(olen);
if (EVP_CipherUpdate(ctx, NULL, &olen, (uint8_t*) String_val(data), olen) == 0)
caml_failwith("failed to set additional data");
if ((size_t) olen != caml_string_length(data))
caml_failwith("EVP_CIPHER_CTX_process(): internal error");
CAMLreturn(output);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_EVP_HMAC(value md, value key, value data) {
int klen = 0;
unsigned int olen = 0;
CAMLparam3(md, key, data);
CAMLlocal1(output);
klen = caml_string_length(key);
olen = EVP_MD_size(MD_val(md));
output = caml_alloc_string(olen);
if (HMAC(MD_val(md),
(uint8_t*) String_val(key ), klen,
(uint8_t*) String_val(data ), caml_string_length(data),
(uint8_t*) String_val(output), &olen) == NULL)
caml_failwith("EVP_HMAC failed");
if (olen != (unsigned) EVP_MD_size(MD_val(md)))
caml_failwith("ocaml_EVP_HMAC(): internal error");
CAMLreturn(output);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rand_bytes(value length) {
CAMLparam1(length);
CAMLlocal1(output);
output = caml_alloc_string(Int_val(length));
if (RAND_bytes((uint8_t*) String_val(output), Int_val(length)) == 0)
caml_failwith("RAND_bytes failed");
CAMLreturn(output);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rand_status(value unit) {
CAMLparam1(unit);
CAMLreturn(RAND_status() ? Val_true : Val_false);
}
/* -------------------------------------------------------------------- */
#define RSA_val(v) (*((RSA**) Data_custom_val(v)))
#define PD_NONE 0
#define PD_PKCS1 1
static void ocaml_rsa_finalize(value mlctx) {
RSA *rsa = RSA_val(mlctx);
if (rsa != NULL)
RSA_free(rsa);
}
static struct custom_operations evp_rsa_ops = {
.identifier = "ocaml_rsa_ctx",
.finalize = ocaml_rsa_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
/* -------------------------------------------------------------------- */
static int RSAPadding_val(value mlvalue) {
switch (Int_val(mlvalue)) {
case PD_NONE : return RSA_NO_PADDING;
case PD_PKCS1: return RSA_PKCS1_PADDING;
}
abort();
}
/* -------------------------------------------------------------------- */
#define RSAKey_mod(v) (Field(v, 0))
#define RSAKey_pub_exp(v) (Field(v, 1))
#define RSAKey_pvr_exp(v) (Field(v, 2))
#define RSAKey_set_mod(v, x) Store_field(v, 0, x)
#define RSAKey_set_pub_exp(v, x) Store_field(v, 1, x)
#define RSAKey_set_prv_exp(v, x) Store_field(v, 2, x)
#define RSAKeyAlloc() (caml_alloc_tuple(3))
/* -------------------------------------------------------------------- */
static const EVP_MD *RSADigest_val(value digest) {
switch (Int_val(digest)) {
case 0: return EVP_md5();
case 1: return EVP_sha1();
case 2: return EVP_sha224();
case 3: return EVP_sha256();
case 4: return EVP_sha384();
case 5: return EVP_sha512();
}
abort();
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_new(value unit) {
RSA *rsa = NULL;
CAMLparam1(unit);
CAMLlocal1(mlrsa);
mlrsa = caml_alloc_custom(&evp_rsa_ops, sizeof(RSA*), 0, 1);
if ((rsa = RSA_new()) == NULL)
caml_failwith("cannot allocate RSA structure");
(void) RSA_set_method(rsa, RSA_PKCS1_OpenSSL());
RSA_val(mlrsa) = rsa;
CAMLreturn(mlrsa);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_fini(value mlrsa) {
CAMLparam1(mlrsa);
if (RSA_val(mlrsa) != NULL) {
RSA_free(RSA_val(mlrsa));
RSA_val(mlrsa) = NULL;
}
CAMLreturn(Val_unit);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_gen_key(value mlsz, value mlexp) {
RSA *rsa = RSA_new();
BIGNUM *bn_mlexp = BN_new();
CAMLparam2(mlsz, mlexp);
if (rsa == NULL || bn_mlexp == NULL)
caml_failwith("RSA:genkey failed");
# ifdef DEBUG
printf("ocaml_rsa_gen_key: modulus size will be of %d bits (%d bytes)\n", Int_val(mlsz), Int_val(mlsz)/8);
# endif
BN_set_word(bn_mlexp, Int_val(mlexp));
if (RSA_generate_key_ex(rsa, Int_val(mlsz), bn_mlexp, NULL) != 1) {
RSA_free(rsa);
BN_free(bn_mlexp);
caml_failwith("RSA:genkey failed");
}
CAMLlocal3(e, n, d);
const BIGNUM *b_n, *b_e, *b_d;
RSA_get0_key(rsa, &b_n, &b_e, &b_d);
n = caml_alloc_string(BN_num_bytes(b_n));
e = caml_alloc_string(BN_num_bytes(b_e));
d = caml_alloc_string(BN_num_bytes(b_d));
(void) BN_bn2bin(b_n, (uint8_t*) String_val(n));
(void) BN_bn2bin(b_e, (uint8_t*) String_val(e));
(void) BN_bn2bin(b_d, (uint8_t*) String_val(d));
BN_free(bn_mlexp);
RSA_free(rsa);
# ifdef DEBUG
printf("ocaml_rsa_gen_key: length(n)=%zu, length(e)=%zu, length(d)=%zu\n",
caml_string_length(n), caml_string_length(e), caml_string_length(d));
# endif
CAMLlocal1(ret);
ret = caml_alloc_tuple(3);
Field(ret, 0) = n;
Field(ret, 1) = e;
Field(ret, 2) = d;
CAMLreturn(ret);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_set_key(value mlrsa, value mlkey) {
RSA *rsa = NULL;
BIGNUM *mod = NULL;
BIGNUM *pub = NULL;
BIGNUM *prv = NULL;
CAMLparam2(mlrsa, mlkey);
CAMLlocal3(mlmod, mlpub, mlprv);
const char* failure = "";
if ((rsa = RSA_val(mlrsa)) == NULL)
caml_failwith("RSA has been disposed");
mlmod = RSAKey_mod(mlkey);
mlpub = RSAKey_pub_exp(mlkey);
mlprv = RSAKey_pvr_exp(mlkey);
size_t modbuf_length, pubbuf_length;
uint8_t* modbuf = buffer_of_platform_bytes(mlmod, &modbuf_length);
uint8_t* pubbuf = buffer_of_platform_bytes(mlpub, &pubbuf_length);
uint8_t* prvbuf = NULL;
if (modbuf == NULL || pubbuf == NULL || !modbuf_length || !pubbuf_length) {
failure = "ocaml_rsa_set_key: invalid bytes for key parameters";
goto bailout;
}
mod = BN_bin2bn(modbuf, modbuf_length, NULL);
pub = BN_bin2bn(pubbuf, pubbuf_length, NULL);
# ifdef DEBUG
printf("ocaml_rsa_set_key: modbuf_length=%zu, pubbuf_length=%zu\n", modbuf_length, pubbuf_length);
# endif
if (Is_block(mlprv)) {
CAMLlocal1(prvdata);
prvdata = Field(mlprv, 0);
size_t prvbuf_length;
prvbuf = buffer_of_platform_bytes(prvdata, &prvbuf_length);
if (prvbuf == NULL || !prvbuf_length) {
failure = "ocaml_rsa_set_key: invalid bytes for private key";
goto bailout;
}
prv = BN_bin2bn(prvbuf, prvbuf_length, NULL);
# ifdef DEBUG
printf("ocaml_rsa_set_key: prvbuf_length=%zu\n", prvbuf_length);
# endif
}
if (mod == NULL || pub == NULL || (prv == NULL && Is_block(mlprv))) {
failure = "ocaml_rsa_set_key: cannot allocate internal structure for keys";
goto bailout;
}
RSA_set0_key(rsa, mod, pub, prv);
free(modbuf);
free(pubbuf);
if (prvbuf != NULL)
free(prvbuf);
CAMLreturn(Val_unit);
bailout:
if (mod != NULL) BN_clear_free(mod);
if (pub != NULL) BN_clear_free(pub);
if (prv != NULL) BN_clear_free(prv);
if (modbuf != NULL) free(modbuf);
if (pubbuf != NULL) free(pubbuf);
if (prvbuf != NULL) free(prvbuf);
caml_failwith(failure);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_get_key(value mlrsa) {
RSA *rsa = NULL;
CAMLparam1(mlrsa);
if ((rsa = RSA_val(mlrsa)) == NULL)
caml_failwith("RSA has been disposed");
CAMLlocal3(n, e, d);
const BIGNUM *b_n, *b_e, *b_d;
RSA_get0_key(rsa, &b_n, &b_e, &b_d);
n = caml_alloc_string(BN_num_bytes(b_n));
e = caml_alloc_string(BN_num_bytes(b_e));
(void) BN_bn2bin(b_n, (uint8_t*) String_val(n));
(void) BN_bn2bin(b_e, (uint8_t*) String_val(e));
CAMLlocal1(ret);
ret = caml_alloc_tuple(3);
Field(ret, 0) = n;
Field(ret, 1) = e;
if (b_d == NULL)
Field(ret, 2) = Val_none;
else {
d = caml_alloc_string(BN_num_bytes(b_d));
(void) BN_bn2bin(b_d, (uint8_t*) String_val(d));
Field(ret, 2) = Val_some(d);
}
CAMLreturn(ret);
}
/* -------------------------------------------------------------------- */
typedef int (rsa_dec_t)(int, const uint8_t *, uint8_t *, RSA *, int);
typedef int (rsa_enc_t)(int, const uint8_t *, uint8_t *, RSA *, int);
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_encrypt(value mlrsa, value mlprv, value mlpadding, value data) {
RSA *rsa = NULL;
size_t rsasz = 0, pdsz = 0;
int padding = -1;
rsa_enc_t *enc = NULL;
CAMLparam4(mlrsa, mlprv, mlpadding, data);
CAMLlocal1(output);
if ((rsa = RSA_val(mlrsa)) == NULL)
caml_failwith("RSA has been disposed");
const BIGNUM *b_n, *b_e, *b_d;
RSA_get0_key(rsa, &b_n, &b_e, &b_d);
if (b_e == NULL || (Bool_val(mlprv) && b_d == NULL))
caml_failwith("RSA:encrypt: missing key");
padding = RSAPadding_val(mlpadding);
rsasz = RSA_size(rsa);
switch (padding) {
case RSA_NO_PADDING : pdsz = 0; break ;
case RSA_PKCS1_PADDING: pdsz = 11; break ;
default:
abort();
}
# ifdef DEBUG
printf("caml_string_length(data)=%zu, RSA_size(rsa)=%u\n", caml_string_length(data), RSA_size(rsa));
# endif
if (caml_string_length(data) > (rsasz - pdsz))
caml_failwith("RSA:encrypt: invalid data length");
output = caml_alloc_string(rsasz);
enc = Bool_val(mlprv) ? &RSA_private_encrypt : &RSA_public_encrypt;
ERR_clear_error();
if (enc(caml_string_length(data),
(uint8_t*) String_val(data),
(uint8_t*) String_val(output),
rsa, padding) < 0) {
unsigned long err = ERR_peek_last_error();
char* err_string = ERR_error_string(err, NULL);
caml_failwith(err_string);
}
CAMLreturn(output);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_decrypt(value mlrsa, value mlprv, value mlpadding, value data) {
RSA *rsa = NULL;
size_t rsasz = 0;
int padding = -1;
ssize_t rr;
rsa_dec_t *dec = NULL;
CAMLparam4(mlrsa, mlprv, mlpadding, data);
CAMLlocal2(buffer, output);
if ((rsa = RSA_val(mlrsa)) == NULL)
caml_failwith("RSA has been disposed");
const BIGNUM *b_n, *b_e, *b_d;
RSA_get0_key(rsa, &b_n, &b_e, &b_d);
if (b_e == NULL || (Bool_val(mlprv) && b_d == NULL))
caml_failwith("RSA:decrypt: missing key");
padding = RSAPadding_val(mlpadding);
rsasz = RSA_size(rsa);
if (caml_string_length(data) != rsasz)
caml_failwith("RSA:decrypt: invalid data length");
buffer = caml_alloc_string(rsasz);
dec = Bool_val(mlprv) ? RSA_private_decrypt : RSA_public_decrypt;
ERR_clear_error();
if ((rr = dec(rsasz,
(uint8_t*) String_val(data),
(uint8_t*) String_val(buffer),
rsa, padding)) < 0) {
unsigned long err = ERR_peek_last_error();
char* err_string = ERR_error_string(err, NULL);
caml_failwith(err_string);
}
output = caml_alloc_string(rr);
memcpy(String_val(output), String_val(buffer), rr);
CAMLreturn(output);
}
/* -------------------------------------------------------------------- */
// ADL(Aug. 3) Rewrote these functions to use the EVP_DigestSign and EVP_DigestVerify
// in order to support PSS signatures as well as PKCS#1
CAMLprim value ocaml_rsa_sign(value mlrsa, value pss, value mldigest, value data) {
CAMLparam4(mlrsa, pss, mldigest, data);
CAMLlocal1(output);
RSA *rsa = NULL;
if ((rsa = RSA_val(mlrsa)) == NULL) caml_failwith("RSA has been disposed");
size_t olen = RSA_size(rsa);
output = caml_alloc_string(olen);
if(mldigest == Val_none) { // MD5+SHA1
if(pss == Val_true) caml_failwith("ocaml_rsa_sign: can't use PSS with MD5SHA1");
if (RSA_sign(NID_md5_sha1, (uint8_t*) String_val(data), caml_string_length(data),
(uint8_t*) String_val(output), (unsigned*) &olen, rsa) != 1) {
unsigned long err = ERR_peek_last_error();
char* err_string = ERR_error_string(err, NULL);
caml_failwith(err_string);
}
} else { // Single hash signature
EVP_MD_CTX* md_ctx = EVP_MD_CTX_new();
const EVP_MD *md = RSADigest_val(Some_val(mldigest));
EVP_PKEY* pkey = EVP_PKEY_new();
EVP_PKEY_CTX* key_ctx = NULL;
if(!EVP_PKEY_set1_RSA(pkey, rsa))
caml_failwith("openssl_stub: EVP_PKEY_set1_RSA");
if(EVP_DigestSignInit(md_ctx, &key_ctx, md, NULL, pkey) != 1)
caml_failwith("openssl_stub: EVP_DigestSignInit");
if(pss == Val_true) {
if (EVP_PKEY_CTX_set_rsa_padding(key_ctx, RSA_PKCS1_PSS_PADDING) != 1)
caml_failwith("openssl_stub: EVP_PKEY_CTX_set_rsa_padding PSS");
if(EVP_PKEY_CTX_set_rsa_pss_saltlen(key_ctx, RSA_PSS_SALTLEN_DIGEST) != 1)
caml_failwith("openssl_stub: EVP_PKEY_CTX_set_rsa_pss_saltlen");
} else {
if (EVP_PKEY_CTX_set_rsa_padding(key_ctx, RSA_PKCS1_PADDING) != 1)
caml_failwith("openssl_stub: EVP_PKEY_CTX_set_rsa_padding PKCS1");
}
if(EVP_DigestSign(md_ctx, (uint8_t*)String_val(output), &olen,
(uint8_t*) String_val(data), caml_string_length(data)) != 1) {
#ifdef DEBUG
printf("ocaml_rsa_sign: caml_string_length(data)=%zu, RSA_size(rsa)=%u\n",
caml_string_length(data), RSA_size(rsa));
#endif
unsigned long err = ERR_peek_last_error();
char* err_string = ERR_error_string(err, NULL);
caml_failwith(err_string);
}
EVP_MD_CTX_free(md_ctx);
EVP_PKEY_free(pkey);
}
if (olen != caml_string_length(output))
{
CAMLlocal1(sig);
sig = caml_alloc_string(olen);
memcpy(String_val(sig), String_val(output), olen);
CAMLreturn(sig);
}
CAMLreturn(output);
}
/* -------------------------------------------------------------------- */
CAMLprim value ocaml_rsa_verify(value mlrsa, value pss, value mldigest, value data, value sig) {
CAMLparam5(mlrsa, pss, mldigest, data, sig);
RSA *rsa = NULL; int rr = -1;
if ((rsa = RSA_val(mlrsa)) == NULL) caml_failwith("RSA has been disposed");
if(mldigest == Val_none) {
if(pss == Val_true) caml_failwith("ocaml_rsa_verify: can't use PSS with MD5SHA1");
rr = RSA_verify(NID_md5_sha1, (uint8_t*) String_val(data), caml_string_length(data),
(uint8_t*) String_val(sig), caml_string_length(sig), rsa);
} else {
EVP_MD_CTX* md_ctx = EVP_MD_CTX_new();
const EVP_MD *md = RSADigest_val(Some_val(mldigest));
EVP_PKEY* pkey = EVP_PKEY_new();
EVP_PKEY_CTX* key_ctx = NULL;
if(!EVP_PKEY_set1_RSA(pkey, rsa))
caml_failwith("openssl_stub: EVP_PKEY_set1_RSA");
if(EVP_DigestVerifyInit(md_ctx, &key_ctx, md, NULL, pkey) != 1)
caml_failwith("openssl_stub: EVP_DigestVerifyInit");
if(pss == Val_true) {
if (EVP_PKEY_CTX_set_rsa_padding(key_ctx, RSA_PKCS1_PSS_PADDING) != 1)
caml_failwith("openssl_stub: EVP_PKEY_CTX_set_rsa_padding PSS");
if(EVP_PKEY_CTX_set_rsa_pss_saltlen(key_ctx, RSA_PSS_SALTLEN_DIGEST) != 1)
caml_failwith("openssl_stub: EVP_PKEY_CTX_set_rsa_pss_saltlen");
} else {
if (EVP_PKEY_CTX_set_rsa_padding(key_ctx, RSA_PKCS1_PADDING) != 1)
caml_failwith("openssl_stub: EVP_PKEY_CTX_set_rsa_padding PKCS1");
}
rr = EVP_DigestVerify(md_ctx,
(const unsigned char*) String_val(sig), caml_string_length(sig),
(const unsigned char*) String_val(data), caml_string_length(data));
EVP_MD_CTX_free(md_ctx);
EVP_PKEY_free(pkey);
}
#ifdef DEBUG
if(rr != 1) {
unsigned long err = ERR_peek_last_error();
char* err_string = ERR_error_string(err, NULL);
printf("ocaml_rsa_verify: %s\n", err_string);
}
#endif
CAMLreturn((rr == 1) ? Val_true : Val_false);
}
/* -------------------------------------------------------------------- */
#define DSA_val(v) (*((DSA**) Data_custom_val(v)))
static void ocaml_dsa_finalize(value mlctx) {
DSA *dsa = DSA_val(mlctx);