| /* |
| * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include "e_os.h" |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <unistd.h> |
| #include <assert.h> |
| |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/engine.h> |
| #include <openssl/objects.h> |
| #include <crypto/cryptodev.h> |
| |
| #include "crypto/engine.h" |
| |
| /* #define ENGINE_DEVCRYPTO_DEBUG */ |
| |
| #if CRYPTO_ALGORITHM_MIN < CRYPTO_ALGORITHM_MAX |
| # define CHECK_BSD_STYLE_MACROS |
| #endif |
| |
| /* |
| * ONE global file descriptor for all sessions. This allows operations |
| * such as digest session data copying (see digest_copy()), but is also |
| * saner... why re-open /dev/crypto for every session? |
| */ |
| static int cfd; |
| |
| static int clean_devcrypto_session(struct session_op *sess) { |
| if (ioctl(cfd, CIOCFSESSION, &sess->ses) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| memset(sess, 0, sizeof(struct session_op)); |
| return 1; |
| } |
| |
| /****************************************************************************** |
| * |
| * Ciphers |
| * |
| * Because they all do the same basic operation, we have only one set of |
| * method functions for them all to share, and a mapping table between |
| * NIDs and cryptodev IDs, with all the necessary size data. |
| * |
| *****/ |
| |
| struct cipher_ctx { |
| struct session_op sess; |
| int op; /* COP_ENCRYPT or COP_DECRYPT */ |
| unsigned long mode; /* EVP_CIPH_*_MODE */ |
| |
| /* to handle ctr mode being a stream cipher */ |
| unsigned char partial[EVP_MAX_BLOCK_LENGTH]; |
| unsigned int blocksize, num; |
| }; |
| |
| static const struct cipher_data_st { |
| int nid; |
| int blocksize; |
| int keylen; |
| int ivlen; |
| int flags; |
| int devcryptoid; |
| } cipher_data[] = { |
| #ifndef OPENSSL_NO_DES |
| { NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC }, |
| { NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC }, |
| #endif |
| #ifndef OPENSSL_NO_BF |
| { NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC }, |
| #endif |
| #ifndef OPENSSL_NO_CAST |
| { NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC }, |
| #endif |
| { NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC }, |
| { NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC }, |
| { NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC }, |
| #ifndef OPENSSL_NO_RC4 |
| { NID_rc4, 1, 16, 0, EVP_CIPH_STREAM_CIPHER, CRYPTO_ARC4 }, |
| #endif |
| #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_CTR) |
| { NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR }, |
| { NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR }, |
| { NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR }, |
| #endif |
| #if 0 /* Not yet supported */ |
| { NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS }, |
| { NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS }, |
| #endif |
| #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_ECB) |
| { NID_aes_128_ecb, 16, 128 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB }, |
| { NID_aes_192_ecb, 16, 192 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB }, |
| { NID_aes_256_ecb, 16, 256 / 8, 0, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB }, |
| #endif |
| #if 0 /* Not yet supported */ |
| { NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM }, |
| { NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM }, |
| { NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM }, |
| #endif |
| #ifndef OPENSSL_NO_CAMELLIA |
| { NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, |
| CRYPTO_CAMELLIA_CBC }, |
| { NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, |
| CRYPTO_CAMELLIA_CBC }, |
| { NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, |
| CRYPTO_CAMELLIA_CBC }, |
| #endif |
| }; |
| |
| static size_t get_cipher_data_index(int nid) |
| { |
| size_t i; |
| |
| for (i = 0; i < OSSL_NELEM(cipher_data); i++) |
| if (nid == cipher_data[i].nid) |
| return i; |
| |
| /* |
| * Code further down must make sure that only NIDs in the table above |
| * are used. If any other NID reaches this function, there's a grave |
| * coding error further down. |
| */ |
| assert("Code that never should be reached" == NULL); |
| return -1; |
| } |
| |
| static const struct cipher_data_st *get_cipher_data(int nid) |
| { |
| return &cipher_data[get_cipher_data_index(nid)]; |
| } |
| |
| /* |
| * Following are the three necessary functions to map OpenSSL functionality |
| * with cryptodev. |
| */ |
| |
| static int cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
| const unsigned char *iv, int enc) |
| { |
| struct cipher_ctx *cipher_ctx = |
| (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); |
| const struct cipher_data_st *cipher_d = |
| get_cipher_data(EVP_CIPHER_CTX_nid(ctx)); |
| |
| /* cleanup a previous session */ |
| if (cipher_ctx->sess.ses != 0 && |
| clean_devcrypto_session(&cipher_ctx->sess) == 0) |
| return 0; |
| |
| cipher_ctx->sess.cipher = cipher_d->devcryptoid; |
| cipher_ctx->sess.keylen = cipher_d->keylen; |
| cipher_ctx->sess.key = (void *)key; |
| cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT; |
| cipher_ctx->mode = cipher_d->flags & EVP_CIPH_MODE; |
| cipher_ctx->blocksize = cipher_d->blocksize; |
| if (ioctl(cfd, CIOCGSESSION, &cipher_ctx->sess) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int cipher_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| const unsigned char *in, size_t inl) |
| { |
| struct cipher_ctx *cipher_ctx = |
| (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); |
| struct crypt_op cryp; |
| unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx); |
| #if !defined(COP_FLAG_WRITE_IV) |
| unsigned char saved_iv[EVP_MAX_IV_LENGTH]; |
| const unsigned char *ivptr; |
| size_t nblocks, ivlen; |
| #endif |
| |
| memset(&cryp, 0, sizeof(cryp)); |
| cryp.ses = cipher_ctx->sess.ses; |
| cryp.len = inl; |
| cryp.src = (void *)in; |
| cryp.dst = (void *)out; |
| cryp.iv = (void *)iv; |
| cryp.op = cipher_ctx->op; |
| #if !defined(COP_FLAG_WRITE_IV) |
| cryp.flags = 0; |
| |
| ivlen = EVP_CIPHER_CTX_iv_length(ctx); |
| if (ivlen > 0) |
| switch (cipher_ctx->mode) { |
| case EVP_CIPH_CBC_MODE: |
| assert(inl >= ivlen); |
| if (!EVP_CIPHER_CTX_encrypting(ctx)) { |
| ivptr = in + inl - ivlen; |
| memcpy(saved_iv, ivptr, ivlen); |
| } |
| break; |
| |
| case EVP_CIPH_CTR_MODE: |
| break; |
| |
| default: /* should not happen */ |
| return 0; |
| } |
| #else |
| cryp.flags = COP_FLAG_WRITE_IV; |
| #endif |
| |
| if (ioctl(cfd, CIOCCRYPT, &cryp) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| |
| #if !defined(COP_FLAG_WRITE_IV) |
| if (ivlen > 0) |
| switch (cipher_ctx->mode) { |
| case EVP_CIPH_CBC_MODE: |
| assert(inl >= ivlen); |
| if (EVP_CIPHER_CTX_encrypting(ctx)) |
| ivptr = out + inl - ivlen; |
| else |
| ivptr = saved_iv; |
| |
| memcpy(iv, ivptr, ivlen); |
| break; |
| |
| case EVP_CIPH_CTR_MODE: |
| nblocks = (inl + cipher_ctx->blocksize - 1) |
| / cipher_ctx->blocksize; |
| do { |
| ivlen--; |
| nblocks += iv[ivlen]; |
| iv[ivlen] = (uint8_t) nblocks; |
| nblocks >>= 8; |
| } while (ivlen); |
| break; |
| |
| default: /* should not happen */ |
| return 0; |
| } |
| #endif |
| |
| return 1; |
| } |
| |
| static int ctr_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
| const unsigned char *in, size_t inl) |
| { |
| struct cipher_ctx *cipher_ctx = |
| (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); |
| size_t nblocks, len; |
| |
| /* initial partial block */ |
| while (cipher_ctx->num && inl) { |
| (*out++) = *(in++) ^ cipher_ctx->partial[cipher_ctx->num]; |
| --inl; |
| cipher_ctx->num = (cipher_ctx->num + 1) % cipher_ctx->blocksize; |
| } |
| |
| /* full blocks */ |
| if (inl > (unsigned int) cipher_ctx->blocksize) { |
| nblocks = inl/cipher_ctx->blocksize; |
| len = nblocks * cipher_ctx->blocksize; |
| if (cipher_do_cipher(ctx, out, in, len) < 1) |
| return 0; |
| inl -= len; |
| out += len; |
| in += len; |
| } |
| |
| /* final partial block */ |
| if (inl) { |
| memset(cipher_ctx->partial, 0, cipher_ctx->blocksize); |
| if (cipher_do_cipher(ctx, cipher_ctx->partial, cipher_ctx->partial, |
| cipher_ctx->blocksize) < 1) |
| return 0; |
| while (inl--) { |
| out[cipher_ctx->num] = in[cipher_ctx->num] |
| ^ cipher_ctx->partial[cipher_ctx->num]; |
| cipher_ctx->num++; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int cipher_ctrl(EVP_CIPHER_CTX *ctx, int type, int p1, void* p2) |
| { |
| struct cipher_ctx *cipher_ctx = |
| (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); |
| EVP_CIPHER_CTX *to_ctx = (EVP_CIPHER_CTX *)p2; |
| struct cipher_ctx *to_cipher_ctx; |
| |
| switch (type) { |
| case EVP_CTRL_COPY: |
| if (cipher_ctx == NULL) |
| return 1; |
| /* when copying the context, a new session needs to be initialized */ |
| to_cipher_ctx = |
| (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(to_ctx); |
| memset(&to_cipher_ctx->sess, 0, sizeof(to_cipher_ctx->sess)); |
| return cipher_init(to_ctx, cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx), |
| (cipher_ctx->op == COP_ENCRYPT)); |
| |
| case EVP_CTRL_INIT: |
| memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess)); |
| return 1; |
| |
| default: |
| break; |
| } |
| |
| return -1; |
| } |
| |
| static int cipher_cleanup(EVP_CIPHER_CTX *ctx) |
| { |
| struct cipher_ctx *cipher_ctx = |
| (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); |
| |
| return clean_devcrypto_session(&cipher_ctx->sess); |
| } |
| |
| /* |
| * Keep a table of known nids and associated methods. |
| * Note that known_cipher_nids[] isn't necessarily indexed the same way as |
| * cipher_data[] above, which known_cipher_methods[] is. |
| */ |
| static int known_cipher_nids[OSSL_NELEM(cipher_data)]; |
| static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */ |
| static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, }; |
| |
| static void prepare_cipher_methods(void) |
| { |
| size_t i; |
| struct session_op sess; |
| unsigned long cipher_mode; |
| |
| memset(&sess, 0, sizeof(sess)); |
| sess.key = (void *)"01234567890123456789012345678901234567890123456789"; |
| |
| for (i = 0, known_cipher_nids_amount = 0; |
| i < OSSL_NELEM(cipher_data); i++) { |
| |
| /* |
| * Check that the algo is really availably by trying to open and close |
| * a session. |
| */ |
| sess.cipher = cipher_data[i].devcryptoid; |
| sess.keylen = cipher_data[i].keylen; |
| if (ioctl(cfd, CIOCGSESSION, &sess) < 0 |
| || ioctl(cfd, CIOCFSESSION, &sess.ses) < 0) |
| continue; |
| |
| cipher_mode = cipher_data[i].flags & EVP_CIPH_MODE; |
| |
| if ((known_cipher_methods[i] = |
| EVP_CIPHER_meth_new(cipher_data[i].nid, |
| cipher_mode == EVP_CIPH_CTR_MODE ? 1 : |
| cipher_data[i].blocksize, |
| cipher_data[i].keylen)) == NULL |
| || !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i], |
| cipher_data[i].ivlen) |
| || !EVP_CIPHER_meth_set_flags(known_cipher_methods[i], |
| cipher_data[i].flags |
| | EVP_CIPH_CUSTOM_COPY |
| | EVP_CIPH_CTRL_INIT |
| | EVP_CIPH_FLAG_DEFAULT_ASN1) |
| || !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init) |
| || !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i], |
| cipher_mode == EVP_CIPH_CTR_MODE ? |
| ctr_do_cipher : |
| cipher_do_cipher) |
| || !EVP_CIPHER_meth_set_ctrl(known_cipher_methods[i], cipher_ctrl) |
| || !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i], |
| cipher_cleanup) |
| || !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i], |
| sizeof(struct cipher_ctx))) { |
| EVP_CIPHER_meth_free(known_cipher_methods[i]); |
| known_cipher_methods[i] = NULL; |
| } else { |
| known_cipher_nids[known_cipher_nids_amount++] = |
| cipher_data[i].nid; |
| } |
| } |
| } |
| |
| static const EVP_CIPHER *get_cipher_method(int nid) |
| { |
| size_t i = get_cipher_data_index(nid); |
| |
| if (i == (size_t)-1) |
| return NULL; |
| return known_cipher_methods[i]; |
| } |
| |
| static int get_cipher_nids(const int **nids) |
| { |
| *nids = known_cipher_nids; |
| return known_cipher_nids_amount; |
| } |
| |
| static void destroy_cipher_method(int nid) |
| { |
| size_t i = get_cipher_data_index(nid); |
| |
| EVP_CIPHER_meth_free(known_cipher_methods[i]); |
| known_cipher_methods[i] = NULL; |
| } |
| |
| static void destroy_all_cipher_methods(void) |
| { |
| size_t i; |
| |
| for (i = 0; i < OSSL_NELEM(cipher_data); i++) |
| destroy_cipher_method(cipher_data[i].nid); |
| } |
| |
| static int devcrypto_ciphers(ENGINE *e, const EVP_CIPHER **cipher, |
| const int **nids, int nid) |
| { |
| if (cipher == NULL) |
| return get_cipher_nids(nids); |
| |
| *cipher = get_cipher_method(nid); |
| |
| return *cipher != NULL; |
| } |
| |
| /* |
| * We only support digests if the cryptodev implementation supports multiple |
| * data updates and session copying. Otherwise, we would be forced to maintain |
| * a cache, which is perilous if there's a lot of data coming in (if someone |
| * wants to checksum an OpenSSL tarball, for example). |
| */ |
| #if defined(CIOCCPHASH) && defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL) |
| #define IMPLEMENT_DIGEST |
| |
| /****************************************************************************** |
| * |
| * Digests |
| * |
| * Because they all do the same basic operation, we have only one set of |
| * method functions for them all to share, and a mapping table between |
| * NIDs and cryptodev IDs, with all the necessary size data. |
| * |
| *****/ |
| |
| struct digest_ctx { |
| struct session_op sess; |
| /* This signals that the init function was called, not that it succeeded. */ |
| int init_called; |
| }; |
| |
| static const struct digest_data_st { |
| int nid; |
| int blocksize; |
| int digestlen; |
| int devcryptoid; |
| } digest_data[] = { |
| #ifndef OPENSSL_NO_MD5 |
| { NID_md5, /* MD5_CBLOCK */ 64, 16, CRYPTO_MD5 }, |
| #endif |
| { NID_sha1, SHA_CBLOCK, 20, CRYPTO_SHA1 }, |
| #ifndef OPENSSL_NO_RMD160 |
| # if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_RIPEMD160) |
| { NID_ripemd160, /* RIPEMD160_CBLOCK */ 64, 20, CRYPTO_RIPEMD160 }, |
| # endif |
| #endif |
| #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_224) |
| { NID_sha224, SHA256_CBLOCK, 224 / 8, CRYPTO_SHA2_224 }, |
| #endif |
| #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_256) |
| { NID_sha256, SHA256_CBLOCK, 256 / 8, CRYPTO_SHA2_256 }, |
| #endif |
| #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_384) |
| { NID_sha384, SHA512_CBLOCK, 384 / 8, CRYPTO_SHA2_384 }, |
| #endif |
| #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_512) |
| { NID_sha512, SHA512_CBLOCK, 512 / 8, CRYPTO_SHA2_512 }, |
| #endif |
| }; |
| |
| static size_t get_digest_data_index(int nid) |
| { |
| size_t i; |
| |
| for (i = 0; i < OSSL_NELEM(digest_data); i++) |
| if (nid == digest_data[i].nid) |
| return i; |
| |
| /* |
| * Code further down must make sure that only NIDs in the table above |
| * are used. If any other NID reaches this function, there's a grave |
| * coding error further down. |
| */ |
| assert("Code that never should be reached" == NULL); |
| return -1; |
| } |
| |
| static const struct digest_data_st *get_digest_data(int nid) |
| { |
| return &digest_data[get_digest_data_index(nid)]; |
| } |
| |
| /* |
| * Following are the four necessary functions to map OpenSSL functionality |
| * with cryptodev. |
| */ |
| |
| static int digest_init(EVP_MD_CTX *ctx) |
| { |
| struct digest_ctx *digest_ctx = |
| (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); |
| const struct digest_data_st *digest_d = |
| get_digest_data(EVP_MD_CTX_type(ctx)); |
| |
| digest_ctx->init_called = 1; |
| |
| memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess)); |
| digest_ctx->sess.mac = digest_d->devcryptoid; |
| if (ioctl(cfd, CIOCGSESSION, &digest_ctx->sess) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int digest_op(struct digest_ctx *ctx, const void *src, size_t srclen, |
| void *res, unsigned int flags) |
| { |
| struct crypt_op cryp; |
| |
| memset(&cryp, 0, sizeof(cryp)); |
| cryp.ses = ctx->sess.ses; |
| cryp.len = srclen; |
| cryp.src = (void *)src; |
| cryp.dst = NULL; |
| cryp.mac = res; |
| cryp.flags = flags; |
| return ioctl(cfd, CIOCCRYPT, &cryp); |
| } |
| |
| static int digest_update(EVP_MD_CTX *ctx, const void *data, size_t count) |
| { |
| struct digest_ctx *digest_ctx = |
| (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); |
| |
| if (count == 0) |
| return 1; |
| |
| if (digest_ctx == NULL) |
| return 0; |
| |
| if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int digest_final(EVP_MD_CTX *ctx, unsigned char *md) |
| { |
| struct digest_ctx *digest_ctx = |
| (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); |
| |
| if (md == NULL || digest_ctx == NULL) |
| return 0; |
| if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int digest_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from) |
| { |
| struct digest_ctx *digest_from = |
| (struct digest_ctx *)EVP_MD_CTX_md_data(from); |
| struct digest_ctx *digest_to = |
| (struct digest_ctx *)EVP_MD_CTX_md_data(to); |
| struct cphash_op cphash; |
| |
| if (digest_from == NULL || digest_from->init_called != 1) |
| return 1; |
| |
| if (!digest_init(to)) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| |
| cphash.src_ses = digest_from->sess.ses; |
| cphash.dst_ses = digest_to->sess.ses; |
| if (ioctl(cfd, CIOCCPHASH, &cphash) < 0) { |
| SYSerr(SYS_F_IOCTL, errno); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int digest_cleanup(EVP_MD_CTX *ctx) |
| { |
| struct digest_ctx *digest_ctx = |
| (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); |
| |
| if (digest_ctx == NULL) |
| return 1; |
| |
| return clean_devcrypto_session(&digest_ctx->sess); |
| } |
| |
| static int devcrypto_test_digest(size_t digest_data_index) |
| { |
| struct session_op sess1, sess2; |
| struct cphash_op cphash; |
| int ret=0; |
| |
| memset(&sess1, 0, sizeof(sess1)); |
| memset(&sess2, 0, sizeof(sess2)); |
| sess1.mac = digest_data[digest_data_index].devcryptoid; |
| if (ioctl(cfd, CIOCGSESSION, &sess1) < 0) |
| return 0; |
| /* Make sure the driver is capable of hash state copy */ |
| sess2.mac = sess1.mac; |
| if (ioctl(cfd, CIOCGSESSION, &sess2) >= 0) { |
| cphash.src_ses = sess1.ses; |
| cphash.dst_ses = sess2.ses; |
| if (ioctl(cfd, CIOCCPHASH, &cphash) >= 0) |
| ret = 1; |
| ioctl(cfd, CIOCFSESSION, &sess2.ses); |
| } |
| ioctl(cfd, CIOCFSESSION, &sess1.ses); |
| return ret; |
| } |
| |
| /* |
| * Keep a table of known nids and associated methods. |
| * Note that known_digest_nids[] isn't necessarily indexed the same way as |
| * digest_data[] above, which known_digest_methods[] is. |
| */ |
| static int known_digest_nids[OSSL_NELEM(digest_data)]; |
| static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */ |
| static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, }; |
| |
| static void prepare_digest_methods(void) |
| { |
| size_t i; |
| |
| for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data); |
| i++) { |
| |
| /* |
| * Check that the algo is usable |
| */ |
| if (!devcrypto_test_digest(i)) |
| continue; |
| |
| if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid, |
| NID_undef)) == NULL |
| || !EVP_MD_meth_set_input_blocksize(known_digest_methods[i], |
| digest_data[i].blocksize) |
| || !EVP_MD_meth_set_result_size(known_digest_methods[i], |
| digest_data[i].digestlen) |
| || !EVP_MD_meth_set_init(known_digest_methods[i], digest_init) |
| || !EVP_MD_meth_set_update(known_digest_methods[i], digest_update) |
| || !EVP_MD_meth_set_final(known_digest_methods[i], digest_final) |
| || !EVP_MD_meth_set_copy(known_digest_methods[i], digest_copy) |
| || !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup) |
| || !EVP_MD_meth_set_app_datasize(known_digest_methods[i], |
| sizeof(struct digest_ctx))) { |
| EVP_MD_meth_free(known_digest_methods[i]); |
| known_digest_methods[i] = NULL; |
| } else { |
| known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid; |
| } |
| } |
| } |
| |
| static const EVP_MD *get_digest_method(int nid) |
| { |
| size_t i = get_digest_data_index(nid); |
| |
| if (i == (size_t)-1) |
| return NULL; |
| return known_digest_methods[i]; |
| } |
| |
| static int get_digest_nids(const int **nids) |
| { |
| *nids = known_digest_nids; |
| return known_digest_nids_amount; |
| } |
| |
| static void destroy_digest_method(int nid) |
| { |
| size_t i = get_digest_data_index(nid); |
| |
| EVP_MD_meth_free(known_digest_methods[i]); |
| known_digest_methods[i] = NULL; |
| } |
| |
| static void destroy_all_digest_methods(void) |
| { |
| size_t i; |
| |
| for (i = 0; i < OSSL_NELEM(digest_data); i++) |
| destroy_digest_method(digest_data[i].nid); |
| } |
| |
| static int devcrypto_digests(ENGINE *e, const EVP_MD **digest, |
| const int **nids, int nid) |
| { |
| if (digest == NULL) |
| return get_digest_nids(nids); |
| |
| *digest = get_digest_method(nid); |
| |
| return *digest != NULL; |
| } |
| |
| #endif |
| |
| /****************************************************************************** |
| * |
| * LOAD / UNLOAD |
| * |
| *****/ |
| |
| static int devcrypto_unload(ENGINE *e) |
| { |
| destroy_all_cipher_methods(); |
| #ifdef IMPLEMENT_DIGEST |
| destroy_all_digest_methods(); |
| #endif |
| |
| close(cfd); |
| |
| return 1; |
| } |
| /* |
| * This engine is always built into libcrypto, so it doesn't offer any |
| * ability to be dynamically loadable. |
| */ |
| void engine_load_devcrypto_int() |
| { |
| ENGINE *e = NULL; |
| int fd; |
| |
| if ((fd = open("/dev/crypto", O_RDWR, 0)) < 0) { |
| #ifndef ENGINE_DEVCRYPTO_DEBUG |
| if (errno != ENOENT) |
| #endif |
| fprintf(stderr, "Could not open /dev/crypto: %s\n", strerror(errno)); |
| return; |
| } |
| |
| #ifdef CRIOGET |
| if (ioctl(fd, CRIOGET, &cfd) < 0) { |
| fprintf(stderr, "Could not create crypto fd: %s\n", strerror(errno)); |
| close(fd); |
| cfd = -1; |
| return; |
| } |
| close(fd); |
| #else |
| cfd = fd; |
| #endif |
| |
| if ((e = ENGINE_new()) == NULL |
| || !ENGINE_set_destroy_function(e, devcrypto_unload)) { |
| ENGINE_free(e); |
| /* |
| * We know that devcrypto_unload() won't be called when one of the |
| * above two calls have failed, so we close cfd explicitly here to |
| * avoid leaking resources. |
| */ |
| close(cfd); |
| return; |
| } |
| |
| prepare_cipher_methods(); |
| #ifdef IMPLEMENT_DIGEST |
| prepare_digest_methods(); |
| #endif |
| |
| if (!ENGINE_set_id(e, "devcrypto") |
| || !ENGINE_set_name(e, "/dev/crypto engine") |
| |
| /* |
| * Asymmetric ciphers aren't well supported with /dev/crypto. Among the BSD |
| * implementations, it seems to only exist in FreeBSD, and regarding the |
| * parameters in its crypt_kop, the manual crypto(4) has this to say: |
| * |
| * The semantics of these arguments are currently undocumented. |
| * |
| * Reading through the FreeBSD source code doesn't give much more than |
| * their CRK_MOD_EXP implementation for ubsec. |
| * |
| * It doesn't look much better with cryptodev-linux. They have the crypt_kop |
| * structure as well as the command (CRK_*) in cryptodev.h, but no support |
| * seems to be implemented at all for the moment. |
| * |
| * At the time of writing, it seems impossible to write proper support for |
| * FreeBSD's asym features without some very deep knowledge and access to |
| * specific kernel modules. |
| * |
| * /Richard Levitte, 2017-05-11 |
| */ |
| #if 0 |
| # ifndef OPENSSL_NO_RSA |
| || !ENGINE_set_RSA(e, devcrypto_rsa) |
| # endif |
| # ifndef OPENSSL_NO_DSA |
| || !ENGINE_set_DSA(e, devcrypto_dsa) |
| # endif |
| # ifndef OPENSSL_NO_DH |
| || !ENGINE_set_DH(e, devcrypto_dh) |
| # endif |
| # ifndef OPENSSL_NO_EC |
| || !ENGINE_set_EC(e, devcrypto_ec) |
| # endif |
| #endif |
| || !ENGINE_set_ciphers(e, devcrypto_ciphers) |
| #ifdef IMPLEMENT_DIGEST |
| || !ENGINE_set_digests(e, devcrypto_digests) |
| #endif |
| ) { |
| ENGINE_free(e); |
| return; |
| } |
| |
| ENGINE_add(e); |
| ENGINE_free(e); /* Loose our local reference */ |
| ERR_clear_error(); |
| } |
