| /* SPDX-License-Identifier: BSD-2-Clause */ |
| /******************************************************************************* |
| * Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG |
| * All rights reserved. |
| ******************************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include <gcrypt.h> |
| #include <stdio.h> |
| |
| #include "tss2_esys.h" |
| |
| #include "esys_crypto.h" |
| #include "esys_iutil.h" |
| #include "esys_mu.h" |
| #define LOGMODULE esys_crypto |
| #include "util/log.h" |
| #include "util/aux_util.h" |
| |
| /** Context to hold temporary values for iesys_crypto */ |
| typedef struct _IESYS_CRYPTO_CONTEXT { |
| enum { |
| IESYS_CRYPTOGCRY_TYPE_HASH = 1, |
| IESYS_CRYPTOGCRY_TYPE_HMAC, |
| } type; /**< The type of context to hold; hash or hmac */ |
| union { |
| struct { |
| gcry_md_hd_t gcry_context; |
| int gcry_hash_alg; |
| size_t hash_len; |
| } hash; /**< the state variables for a hash context */ |
| struct { |
| gcry_mac_hd_t gcry_context; |
| int gcry_hmac_alg; |
| size_t hmac_len; |
| } hmac; /**< the state variables for an hmac context */ |
| }; |
| } IESYS_CRYPTOGCRY_CONTEXT; |
| |
| |
| /* Convert gcrypt mpi number to binary with fixed length */ |
| static gcry_error_t mpi2bin(gcry_mpi_t mpi, unsigned char *bin, |
| size_t bin_length, size_t max_out_size) |
| { |
| gcry_error_t err; |
| size_t size; |
| size_t offset; |
| |
| /* Determine size of mpi */ |
| err = gcry_mpi_print(GCRYMPI_FMT_USG, NULL, max_out_size, &size, mpi); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_mpi_print"); |
| return err; |
| } |
| |
| offset = bin_length - size; |
| memset(&bin[0], 0,offset); |
| err = gcry_mpi_print(GCRYMPI_FMT_USG, &bin[offset], bin_length - offset, &size, mpi); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_mpi_print"); |
| } |
| return err; |
| } |
| |
| /** Provide the context for the computation of a hash digest. |
| * |
| * The context will be created and initialized according to the hash function. |
| * @param[out] context The created context (callee-allocated). |
| * @param[in] hashAlg The hash algorithm for the creation of the context. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_VALUE or TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_MEMORY Memory cannot be allocated. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_start(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| TPM2_ALG_ID hashAlg) |
| { |
| LOG_TRACE("call: context=%p hashAlg=%"PRIu16, context, hashAlg); |
| return_if_null(context, "Context is NULL", TSS2_ESYS_RC_BAD_REFERENCE); |
| |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext; |
| mycontext = calloc(1, sizeof(IESYS_CRYPTOGCRY_CONTEXT)); |
| return_if_null(mycontext, "Out of Memory", TSS2_ESYS_RC_MEMORY); |
| |
| mycontext->type = IESYS_CRYPTOGCRY_TYPE_HASH; |
| |
| switch (hashAlg) { |
| case TPM2_ALG_SHA1: |
| mycontext->hash.gcry_hash_alg = GCRY_MD_SHA1; |
| break; |
| case TPM2_ALG_SHA256: |
| mycontext->hash.gcry_hash_alg = GCRY_MD_SHA256; |
| break; |
| case TPM2_ALG_SHA384: |
| mycontext->hash.gcry_hash_alg = GCRY_MD_SHA384; |
| break; |
| default: |
| LOG_ERROR("Unsupported hash algorithm (%"PRIu16")", hashAlg); |
| free(mycontext); |
| return TSS2_ESYS_RC_NOT_IMPLEMENTED; |
| } |
| int hash_len = gcry_md_get_algo_dlen(mycontext->hash.gcry_hash_alg); |
| if (hash_len <= 0) { |
| LOG_ERROR("Unsupported hash algorithm (%"PRIu16")", hashAlg); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| mycontext->hash.hash_len = hash_len; |
| |
| gcry_error_t r = gcry_md_open(&mycontext->hash.gcry_context, |
| mycontext->hash.gcry_hash_alg, 0); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| *context = (IESYS_CRYPTO_CONTEXT_BLOB *) mycontext; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update the digest value of a digest object from a byte buffer. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] buffer The data for the update. |
| * @param[in] size The size of the data buffer. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_update(IESYS_CRYPTO_CONTEXT_BLOB * context, |
| const uint8_t * buffer, size_t size) |
| { |
| LOG_TRACE("called for context %p, buffer %p and size %zd", context, buffer, |
| size); |
| if (context == NULL || buffer == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = (IESYS_CRYPTOGCRY_CONTEXT *) context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HASH) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| LOGBLOB_TRACE(buffer, size, "Updating hash with"); |
| |
| gcry_md_write(mycontext->hash.gcry_context, buffer, size); |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update the digest value of a digest object from a TPM2B object. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] b The TPM2B object for the update. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_update2b(IESYS_CRYPTO_CONTEXT_BLOB * context, TPM2B * b) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, b); |
| if (context == NULL || b == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| TSS2_RC ret = iesys_cryptogcry_hash_update(context, &b->buffer[0], b->size); |
| return ret; |
| } |
| |
| /** Get the digest value of a digest object and close the context. |
| * |
| * The digest value will written to a passed buffer and the resources of the |
| * digest object are released. |
| * @param[in,out] context The context of the digest object to be released |
| * @param[out] buffer The buffer for the digest value (caller-allocated). |
| * @param[out] size The size of the digest. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hash_finish(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| uint8_t * buffer, size_t * size) |
| { |
| LOG_TRACE("called for context-pointer %p, buffer %p and size-pointer %p", |
| context, buffer, size); |
| if (context == NULL || *context == NULL || buffer == NULL || size == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HASH) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| if (*size < mycontext->hash.hash_len) { |
| LOG_ERROR("Buffer too small"); |
| return TSS2_ESYS_RC_BAD_SIZE; |
| } |
| |
| uint8_t *cpHash = gcry_md_read(mycontext->hash.gcry_context, |
| mycontext->hash.gcry_hash_alg); |
| return_if_null(cpHash, "GCry error.", TSS2_ESYS_RC_GENERAL_FAILURE); |
| |
| LOGBLOB_TRACE(cpHash, mycontext->hash.hash_len, "read hash result"); |
| |
| *size = mycontext->hash.hash_len; |
| memmove(buffer, cpHash, *size); |
| |
| gcry_md_close(mycontext->hash.gcry_context); |
| |
| free(mycontext); |
| *context = NULL; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Release the resources of a digest object. |
| * |
| * The assigned resources will be released and the context will be set to NULL. |
| * @param[in,out] context The context of the digest object. |
| */ |
| void |
| iesys_cryptogcry_hash_abort(IESYS_CRYPTO_CONTEXT_BLOB ** context) |
| { |
| LOG_TRACE("called for context-pointer %p", context); |
| if (context == NULL || *context == NULL) { |
| LOG_DEBUG("Null-Pointer passed"); |
| return; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| (IESYS_CRYPTOGCRY_CONTEXT *) * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HASH) { |
| LOG_DEBUG("bad context"); |
| return; |
| } |
| |
| gcry_md_close(mycontext->hash.gcry_context); |
| free(mycontext); |
| *context = NULL; |
| } |
| |
| /* HMAC */ |
| |
| /** Provide the context an HMAC digest object from a byte buffer key. |
| * |
| * The context will be created and initialized according to the hash function |
| * and the used HMAC key. |
| * @param[out] context The created context (callee-allocated). |
| * @param[in] hmacAlg The hash algorithm for the HMAC computation. |
| * @param[in] key The byte buffer of the HMAC key. |
| * @param[in] size The size of the HMAC key. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_MEMORY Memory cannot be allocated. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_start(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| TPM2_ALG_ID hmacAlg, |
| const uint8_t * key, size_t size) |
| { |
| TSS2_RC r; |
| |
| LOG_TRACE("called for context-pointer %p and hmacAlg %d", context, hmacAlg); |
| LOGBLOB_TRACE(key, size, "Starting hmac with"); |
| if (context == NULL || key == NULL) { |
| LOG_ERROR("Null-Pointer passed in for context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| calloc(1, sizeof(IESYS_CRYPTOGCRY_CONTEXT)); |
| return_if_null(mycontext, "Out of Memory", TSS2_ESYS_RC_MEMORY); |
| |
| switch (hmacAlg) { |
| case TPM2_ALG_SHA1: |
| mycontext->hmac.gcry_hmac_alg = GCRY_MAC_HMAC_SHA1; |
| break; |
| case TPM2_ALG_SHA256: |
| mycontext->hmac.gcry_hmac_alg = GCRY_MAC_HMAC_SHA256; |
| break; |
| default: |
| LOG_ERROR("Unsupported hmac algo."); |
| free(mycontext); |
| return TSS2_ESYS_RC_NOT_IMPLEMENTED; |
| } |
| |
| int hmac_len = gcry_mac_get_algo_maclen(mycontext->hmac.gcry_hmac_alg); |
| if (hmac_len <= 0) { |
| LOG_ERROR("GCry error."); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| mycontext->type = IESYS_CRYPTOGCRY_TYPE_HMAC; |
| mycontext->hmac.hmac_len = hmac_len; |
| |
| r = gcry_mac_open(&mycontext->hmac.gcry_context, |
| mycontext->hmac.gcry_hmac_alg, 0, NULL); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| r = gcry_mac_setkey(mycontext->hmac.gcry_context, key, size); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| gcry_mac_close(mycontext->hmac.gcry_context); |
| free(mycontext); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| *context = (IESYS_CRYPTO_CONTEXT_BLOB *) mycontext; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update and HMAC digest value from a byte buffer. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm and the key of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] buffer The data for the update. |
| * @param[in] size The size of the data buffer. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_update(IESYS_CRYPTO_CONTEXT_BLOB * context, |
| const uint8_t * buffer, size_t size) |
| { |
| LOG_TRACE("called for context %p, buffer %p and size %zd", |
| context, buffer, size); |
| if (context == NULL || buffer == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = (IESYS_CRYPTOGCRY_CONTEXT *) context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HMAC) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| LOGBLOB_TRACE(buffer, size, "Updating hmac with"); |
| |
| if (GPG_ERR_NO_ERROR != gcry_mac_write(mycontext->hmac.gcry_context, buffer, size)) { |
| return_error(TSS2_ESYS_RC_GENERAL_FAILURE, "Gcrypt hmac update"); |
| } |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Update and HMAC digest value from a TPM2B object. |
| * |
| * The context of a digest object will be updated according to the hash |
| * algorithm and the key of the context. |
| * @param[in,out] context The context of the digest object which will be updated. |
| * @param[in] b The TPM2B object for the update. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_update2b(IESYS_CRYPTO_CONTEXT_BLOB * context, TPM2B * b) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, b); |
| if (context == NULL || b == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| TSS2_RC ret = iesys_cryptogcry_hmac_update(context, &b->buffer[0], b->size); |
| return ret; |
| } |
| |
| /** Write the HMAC digest value to a byte buffer and close the context. |
| * |
| * The digest value will written to a passed buffer and the resources of the |
| * HMAC object are released. |
| * @param[in,out] context The context of the HMAC object. |
| * @param[out] buffer The buffer for the digest value (caller-allocated). |
| * @param[out] size The size of the digest. |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_BAD_SIZE If the size passed is lower than the HMAC length. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_finish(IESYS_CRYPTO_CONTEXT_BLOB ** context, |
| uint8_t * buffer, size_t * size) |
| { |
| LOG_TRACE("called for context-pointer %p, buffer %p and size-pointer %p", |
| context, buffer, size); |
| if (context == NULL || *context == NULL || buffer == NULL || size == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| (IESYS_CRYPTOGCRY_CONTEXT *) * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HMAC) { |
| LOG_ERROR("bad context"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| if (*size < mycontext->hmac.hmac_len) { |
| LOG_ERROR("Buffer too small"); |
| return TSS2_ESYS_RC_BAD_SIZE; |
| } |
| |
| TSS2_RC r = gcry_mac_read(mycontext->hmac.gcry_context, buffer, size); |
| if (r != 0) { |
| LOG_ERROR("GCry error."); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| |
| LOGBLOB_TRACE(buffer, *size, "read hmac result"); |
| |
| gcry_mac_close(mycontext->hmac.gcry_context); |
| |
| free(mycontext); |
| *context = NULL; |
| |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Write the HMAC digest value to a TPM2B object and close the context. |
| * |
| * The digest value will written to a passed TPM2B object and the resources of |
| * the HMAC object are released. |
| * @param[in,out] context The context of the HMAC object. |
| * @param[out] hmac The buffer for the digest value (caller-allocated). |
| * @retval TSS2_RC_SUCCESS on success. |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters. |
| * @retval TSS2_ESYS_RC_BAD_SIZE if the size passed is lower than the HMAC length. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_hmac_finish2b(IESYS_CRYPTO_CONTEXT_BLOB ** context, TPM2B * hmac) |
| { |
| LOG_TRACE("called for context-pointer %p and 2b-pointer %p", context, hmac); |
| if (context == NULL || *context == NULL || hmac == NULL) { |
| LOG_ERROR("Null-Pointer passed"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| size_t s = hmac->size; |
| TSS2_RC ret = iesys_cryptogcry_hmac_finish(context, &hmac->buffer[0], &s); |
| hmac->size = s; |
| return ret; |
| } |
| |
| /** Release the resources of an HAMC object. |
| * |
| * The assigned resources will be released and the context will be set to NULL. |
| * @param[in,out] context The context of the HMAC object. |
| */ |
| void |
| iesys_cryptogcry_hmac_abort(IESYS_CRYPTO_CONTEXT_BLOB ** context) |
| { |
| LOG_TRACE("called for context-pointer %p", context); |
| if (context == NULL || *context == NULL) { |
| LOG_DEBUG("Null-Pointer passed"); |
| return; |
| } |
| if (*context != NULL) { |
| IESYS_CRYPTOGCRY_CONTEXT *mycontext = |
| (IESYS_CRYPTOGCRY_CONTEXT *) * context; |
| if (mycontext->type != IESYS_CRYPTOGCRY_TYPE_HMAC) { |
| LOG_DEBUG("bad context"); |
| return; |
| } |
| |
| gcry_mac_close(mycontext->hmac.gcry_context); |
| |
| free(mycontext); |
| *context = NULL; |
| } |
| } |
| |
| /** Compute random TPM2B data. |
| * |
| * The random data will be generated and written to a passed TPM2B structure. |
| * @param[out] nonce The TPM2B structure for the random data (caller-allocated). |
| * @param[in] num_bytes The number of bytes to be generated. |
| * @retval TSS2_RC_SUCCESS on success. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_random2b(TPM2B_NONCE * nonce, size_t num_bytes) |
| { |
| if (num_bytes == 0) { |
| nonce->size = sizeof(TPMU_HA); |
| } else { |
| nonce->size = num_bytes; |
| } |
| /* |
| * possible values for random level: |
| * GCRY_WEAK_RANDOM GCRY_STRONG_RANDOM GCRY_VERY_STRONG_RANDOM |
| */ |
| gcry_randomize(&nonce->buffer[0], nonce->size, GCRY_STRONG_RANDOM); |
| return TSS2_RC_SUCCESS; |
| } |
| |
| /** Encryption of a buffer using a public (RSA) key. |
| * |
| * Encrypting a buffer using a public key is used for example during |
| * Esys_StartAuthSession in order to encrypt the salt value. |
| * @param[in] key The key to be used for encryption. |
| * @param[in] in_size The size of the buffer to be encrypted. |
| * @param[in] in_buffer The data buffer to be encrypted. |
| * @param[in] max_out_size The maximum size for the output encrypted buffer. |
| * @param[out] out_buffer The encrypted buffer. |
| * @param[out] out_size The size of the encrypted output. |
| * @param[in] label The label used in the encryption scheme. |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval TSS2_ESYS_RC_BAD_VALUE The algorithm of key is not implemented. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE The internal crypto engine failed. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_pk_encrypt(TPM2B_PUBLIC * key, |
| size_t in_size, |
| BYTE * in_buffer, |
| size_t max_out_size, |
| BYTE * out_buffer, |
| size_t * out_size, const char *label) |
| { |
| TSS2_RC r; |
| gcry_error_t err; |
| char *hash_alg; |
| size_t lsize = 0; |
| BYTE exponent[4] = { 0x00, 0x01, 0x00, 0x01 }; |
| char *padding; |
| gcry_sexp_t sexp_data = NULL, sexp_key = NULL, |
| sexp_cipher = NULL, sexp_cipher_a = NULL; |
| gcry_mpi_t mpi_cipher = NULL; |
| |
| if (label != NULL) |
| lsize = strlen(label) + 1; |
| switch (key->publicArea.nameAlg) { |
| case TPM2_ALG_SHA1: |
| hash_alg = "sha1"; |
| break; |
| case TPM2_ALG_SHA256: |
| hash_alg = "sha256"; |
| break; |
| default: |
| LOG_ERROR("Hash alg not implemented"); |
| return TSS2_ESYS_RC_NOT_IMPLEMENTED; |
| } |
| switch (key->publicArea.parameters.rsaDetail.scheme.scheme) { |
| case TPM2_ALG_NULL: |
| padding = "raw"; |
| break; |
| case TPM2_ALG_RSAES: |
| padding = "pkcs1"; |
| break; |
| case TPM2_ALG_OAEP: |
| padding = "oaep"; |
| break; |
| default: |
| LOG_ERROR("Illegal RSA scheme"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| size_t offset = 0; |
| UINT32 exp; |
| if (key->publicArea.parameters.rsaDetail.exponent == 0) |
| exp = 65537; |
| else |
| exp = key->publicArea.parameters.rsaDetail.exponent; |
| r = Tss2_MU_UINT32_Marshal(exp, &exponent[0], sizeof(UINT32), &offset); |
| if (r != TSS2_RC_SUCCESS) { |
| LOG_ERROR("Marshaling"); |
| return r; |
| } |
| err = gcry_sexp_build(&sexp_data, NULL, |
| "(data (flags %s) (hash-algo %s) (label %b) (value %b) )", |
| padding, hash_alg, lsize, label, (int)in_size, |
| in_buffer); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_sexp_build"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| err = gcry_sexp_build(&sexp_key, NULL, "(public-key (rsa (n %b) (e %b)))", |
| (int)key->publicArea.unique.rsa.size, |
| &key->publicArea.unique.rsa.buffer[0], 4, exponent); |
| if (err != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Function gcry_sexp_build", cleanup); |
| } |
| err = gcry_pk_encrypt(&sexp_cipher, sexp_data, sexp_key); |
| if (err != GPG_ERR_NO_ERROR) { |
| fprintf (stderr, "Failure: %s/%s\n", |
| gcry_strsource (err), |
| gcry_strerror (err)); |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Function gcry_pk_encrypt", cleanup); |
| } |
| sexp_cipher_a = gcry_sexp_find_token(sexp_cipher, "a", 0); |
| mpi_cipher = gcry_sexp_nth_mpi(sexp_cipher_a, 1, GCRYMPI_FMT_USG); |
| if (!mpi_cipher) { |
| LOG_ERROR("Function gcry_sexp_nth_mpi"); |
| return TSS2_ESYS_RC_MEMORY; |
| } |
| err = mpi2bin(mpi_cipher, &out_buffer[0], key->publicArea.unique.rsa.size, max_out_size); |
| if (err != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Function mpi2bin", cleanup); |
| } |
| |
| *out_size = key->publicArea.unique.rsa.size; |
| gcry_mpi_release(mpi_cipher); |
| gcry_sexp_release(sexp_data); |
| gcry_sexp_release(sexp_key); |
| gcry_sexp_release(sexp_cipher); |
| gcry_sexp_release(sexp_cipher_a); |
| return TSS2_RC_SUCCESS; |
| |
| cleanup: |
| if (mpi_cipher) |
| gcry_mpi_release(mpi_cipher); |
| |
| if (mpi_cipher) |
| gcry_sexp_release(sexp_data); |
| |
| if (mpi_cipher) |
| gcry_sexp_release(sexp_key); |
| |
| if (mpi_cipher) |
| gcry_sexp_release(sexp_cipher); |
| |
| if (mpi_cipher) |
| gcry_sexp_release(sexp_cipher_a); |
| |
| return r; |
| } |
| |
| /** Computation of ephemeral ECC key and shared secret Z. |
| * |
| * According to the description in TPM spec part 1 C 6.1 a shared secret |
| * between application and TPM is computed (ECDH). An ephemeral ECC key and a |
| * TPM keyare used for the ECDH key exchange. |
| * @param[in] key The key to be used for ECDH key exchange. |
| * @param[in] max_out_size the max size for the output of the public key of the |
| * computed ephemeral key. |
| * @param[out] Z The computed shared secret. |
| * @param[out] Q The public part of the ephemeral key in TPM format. |
| * @param[out] out_buffer The public part of the ephemeral key will be marshaled |
| * to this buffer. |
| * @param[out] out_size The size of the marshaled output. |
| * @retval TSS2_RC_SUCCESS on success |
| * @retval TSS2_ESYS_RC_BAD_VALUE The algorithm of key is not implemented. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE The internal crypto engine failed. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_get_ecdh_point(TPM2B_PUBLIC *key, |
| size_t max_out_size, |
| TPM2B_ECC_PARAMETER *Z, |
| TPMS_ECC_POINT *Q, |
| BYTE * out_buffer, |
| size_t * out_size) |
| { |
| /* |
| * Format strings for some gcrypt sexps have to be created with sprintf due to |
| * a bug in libgcrypt. %s does not work in libgcypt with these sexps. |
| */ |
| #define SEXP_GENKEY_ECC "(genkey (ecc (curve %s)))" |
| #define SEXP_ECC_POINT "(ecc (curve %s) (q.x %sb) (q.y %sb))" |
| |
| TSS2_RC r; |
| char *curveId; |
| gcry_sexp_t mpi_tpm_sq = NULL; /* sexp for public part of TPM key*/ |
| gcry_sexp_t mpi_sd = NULL; /* sexp for private part of ephemeral key */ |
| gcry_sexp_t mpi_s_pub_q = NULL; /* sexp for public part of ephemeral key */ |
| gcry_mpi_point_t mpi_q = NULL; /* public point of ephemeral key */ |
| gcry_mpi_point_t mpi_tpm_q = NULL; /* public point of TPM key */ |
| gcry_mpi_t mpi_d = NULL; /* private part of ephemeral key */ |
| gcry_mpi_point_t mpi_qd = NULL; /* result of mpi_tpm_q * mpi_d */ |
| gcry_ctx_t ctx = NULL; /* context for ec curves */ |
| size_t offset = 0; |
| gcry_mpi_t mpi_x = gcry_mpi_new(521); /* big number for x coordinate */ |
| gcry_mpi_t mpi_y = gcry_mpi_new(521); /* big number for y coordinate */ |
| size_t max_ecc_size; /* max size of ecc coordinate */ |
| |
| /* Set libcrypt constant for curve type */ |
| switch (key->publicArea.parameters.eccDetail.curveID) { |
| case TPM2_ECC_NIST_P192: |
| curveId = "\"NIST P-192\""; |
| max_ecc_size = (192+7)/8; |
| break; |
| case TPM2_ECC_NIST_P224: |
| curveId = "\"NIST P-224\""; |
| max_ecc_size = (224+7)/8; |
| break; |
| case TPM2_ECC_NIST_P256: |
| curveId = "\"NIST P-256\""; |
| max_ecc_size = (256+7)/8; |
| break; |
| case TPM2_ECC_NIST_P384: |
| curveId = "\"NIST P-384\""; |
| max_ecc_size = (384+7)/8; |
| break; |
| case TPM2_ECC_NIST_P521: |
| curveId = "\"NIST P-521\""; |
| max_ecc_size = (521+7)/8; |
| break; |
| default: |
| LOG_ERROR("Illegal ECC curve ID"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| |
| /* compute ephemeral ecc key */ |
| gcry_sexp_t ekey_spec = NULL, ekey_pair = NULL; |
| { /* scope for sexp_ecc_key */ |
| char sexp_ecc_key [sizeof(SEXP_GENKEY_ECC)+strlen(curveId) |
| -1]; // -1 = (-2 for %s +1 for \0) |
| |
| if (sprintf(&sexp_ecc_key[0], SEXP_GENKEY_ECC, curveId) < 1) { |
| goto_error(r, TSS2_ESYS_RC_MEMORY, "asprintf", cleanup); |
| } |
| |
| if (gcry_sexp_build(&ekey_spec, NULL, |
| sexp_ecc_key) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "gcry_sexp_build", cleanup); |
| } |
| } |
| |
| if (gcry_pk_genkey (&ekey_pair, ekey_spec) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Create ephemeral ecc key", |
| cleanup); |
| } |
| |
| /* Get private ephemeral key d */ |
| mpi_sd = gcry_sexp_find_token(ekey_pair, "d", 0); |
| if (mpi_sd == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Get private part of ecc key", cleanup); |
| } |
| mpi_d = gcry_sexp_nth_mpi(mpi_sd, 1, GCRYMPI_FMT_USG); |
| if (mpi_d == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Get private part of ecc key from sexp", cleanup); |
| } |
| |
| /* Construct ephemeral public key */ |
| mpi_s_pub_q = gcry_sexp_find_token(ekey_pair, "public-key", 0); |
| if (mpi_s_pub_q == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get public part ecc key", |
| cleanup); |
| } |
| |
| if (gcry_mpi_ec_new (&ctx, mpi_s_pub_q, curveId) != GPG_ERR_NO_ERROR) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Create ec", cleanup); |
| } |
| mpi_q = gcry_mpi_ec_get_point ("q", ctx, 1); |
| if (mpi_q == NULL) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get ecc point", cleanup); |
| } |
| |
| /* Check whether point is on curve */ |
| if (!gcry_mpi_ec_curve_point(mpi_q, ctx)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Point not on curve", cleanup); |
| } |
| |
| /* Store ephemeral public key in Q */ |
| if (gcry_mpi_ec_get_affine (mpi_x, mpi_y, mpi_q, ctx)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Point is at infinity", |
| cleanup); |
| } |
| |
| if (mpi2bin(mpi_x, &Q->x.buffer[0], max_ecc_size, max_out_size)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get x part of point", |
| cleanup); |
| } |
| |
| if (mpi2bin(mpi_y, &Q->y.buffer[0], max_ecc_size, max_out_size)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "Get y part of point", |
| cleanup); |
| } |
| |
| Q->x.size = max_ecc_size; |
| Q->y.size = max_ecc_size; |
| gcry_ctx_release(ctx); |
| |
| { /* scope for sexp_point */ |
| |
| /* Get public point from TPM key */ |
| char sexp_point [sizeof(SEXP_ECC_POINT) + strlen(curveId) |
| + key->publicArea.unique.ecc.x.size |
| + key->publicArea.unique.ecc.y.size |
| - 5]; /* -1 = (-4 for 2*%sb -2 for %s +1 for \0) */ |
| |
| if (sprintf(&sexp_point[0], SEXP_ECC_POINT, |
| curveId, "%", "%") <1 ) { |
| goto_error(r, TSS2_ESYS_RC_MEMORY, "asprintf", cleanup); |
| } |
| |
| if ( gcry_sexp_build(&mpi_tpm_sq, NULL, |
| sexp_point, |
| key->publicArea.unique.ecc.x.size, |
| &key->publicArea.unique.ecc.x.buffer[0], |
| key->publicArea.unique.ecc.y.size, |
| &key->publicArea.unique.ecc.y.buffer[0])) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Function gcry_mpi_scan", cleanup); |
| |
| } |
| } |
| offset = 0; |
| r = Tss2_MU_TPMS_ECC_POINT_Marshal(Q, &out_buffer[0], max_out_size, &offset); |
| return_if_error(r, "Error marshaling"); |
| *out_size = offset; |
| |
| /* Multiply d and Q */ |
| if (gcry_mpi_ec_new (&ctx, mpi_tpm_sq, curveId)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, "create ec curve", cleanup); |
| } |
| mpi_tpm_q = gcry_mpi_ec_get_point ("q", ctx, 1); |
| mpi_qd = gcry_mpi_point_new(256); |
| gcry_mpi_ec_mul(mpi_qd , mpi_d, mpi_tpm_q, ctx); |
| |
| /* Store the x coordinate of d*Q in Z which will be used for KDFe */ |
| if (gcry_mpi_ec_get_affine (mpi_x, mpi_y, mpi_qd, ctx)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Point is at infinity", cleanup); |
| } |
| |
| if (mpi2bin(mpi_x, &Z->buffer[0], max_ecc_size, TPM2_MAX_ECC_KEY_BYTES)) { |
| goto_error(r, TSS2_ESYS_RC_GENERAL_FAILURE, |
| "Get x coordinate d*Q", cleanup); |
| } |
| |
| Z->size = max_ecc_size; |
| LOGBLOB_DEBUG(&Z->buffer[0], Z->size, "Z (Q*d)"); |
| |
| cleanup: |
| if (ctx) |
| gcry_ctx_release(ctx); |
| |
| if (mpi_x) |
| gcry_mpi_release(mpi_x); |
| |
| if (mpi_y) |
| gcry_mpi_release(mpi_y); |
| |
| if (mpi_d) |
| gcry_mpi_release(mpi_d); |
| |
| if (mpi_sd) |
| gcry_sexp_release(mpi_sd); |
| |
| if (mpi_tpm_q) |
| gcry_mpi_point_release(mpi_tpm_q); |
| |
| if (mpi_qd) |
| gcry_mpi_point_release(mpi_qd); |
| |
| if (mpi_q) |
| gcry_mpi_point_release(mpi_q); |
| |
| if (mpi_tpm_sq) |
| gcry_sexp_release(mpi_tpm_sq); |
| |
| if (mpi_s_pub_q) |
| gcry_sexp_release(mpi_s_pub_q); |
| |
| if (ekey_spec) |
| gcry_sexp_release(ekey_spec); |
| |
| if (ekey_pair) |
| gcry_sexp_release(ekey_pair); |
| |
| return r; |
| } |
| |
| /** Initialize AES context for encryption / decryption. |
| * |
| * @param[out] handle for AES context |
| * @param[in] key key used for AES. |
| * @param[in] tpm_sym_alg AES type in TSS2 notation. |
| * @param[in] key_bits Key size in bits. |
| * @param[in] tpm_mode Block cipher mode of opertion in TSS2 notation (CFB). |
| * For parameter encryption only CFB can be used. |
| * @param[in] iv_len Length of initialization vector (iv) in byte. |
| * @param[in] iv The initialization vector. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE for invalid |
| * parameters, TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto |
| * library. |
| */ |
| static TSS2_RC |
| iesys_cryptogcry_sym_aes_init(gcry_cipher_hd_t * cipher_hd, |
| uint8_t * key, |
| TPM2_ALG_ID tpm_sym_alg, |
| TPMI_AES_KEY_BITS key_bits, |
| TPM2_ALG_ID tpm_mode, |
| size_t iv_len, uint8_t * iv) |
| { |
| |
| LOGBLOB_TRACE(key, (key_bits + 7) / 8, "IESYS AES key"); |
| LOGBLOB_TRACE(iv, iv_len, "IESYS AES iv"); |
| int algo, mode, len; |
| size_t key_len = 0; |
| gcry_error_t err; |
| TSS2_RC r = TSS2_RC_SUCCESS; |
| |
| switch (tpm_sym_alg) { |
| case TPM2_ALG_AES: |
| switch (key_bits) { |
| case 128: |
| algo = GCRY_CIPHER_AES128; |
| len = 128; |
| break; |
| case 192: |
| algo = GCRY_CIPHER_AES192; |
| len = 192; |
| break; |
| case 256: |
| algo = GCRY_CIPHER_AES256; |
| len = 256; |
| break; |
| default: |
| LOG_ERROR("Illegal key length."); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| switch (tpm_mode) { |
| case TPM2_ALG_CFB: |
| mode = GCRY_CIPHER_MODE_CFB; |
| break; |
| default: |
| LOG_ERROR("Illegal symmetric algorithm."); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| break; |
| default: |
| LOG_ERROR("Illegal symmetric algorithm."); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| key_len = (len + 7) / 8; |
| err = gcry_cipher_open(cipher_hd, algo, mode, 0); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Opening gcrypt context"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| if (iv_len != 0) { |
| err = gcry_cipher_setiv(*cipher_hd, &iv[0], iv_len); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_setiv"); |
| gcry_cipher_close(*cipher_hd); |
| r = TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| } |
| if (r == TSS2_RC_SUCCESS) { |
| err = gcry_cipher_setkey(*cipher_hd, key, key_len); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_setkey"); |
| gcry_cipher_close(*cipher_hd); |
| r = TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| } |
| return r; |
| } |
| |
| /** Encrypt data with AES. |
| * |
| * @param[in] key key used for AES. |
| * @param[in] tpm_sym_alg AES type in TSS2 notation (must be TPM2_ALG_AES). |
| * @param[in] key_bits Key size in bits. |
| * @param[in] tpm_mode Block cipher mode of opertion in TSS2 notation. |
| * @param[in] blk_len Length Block length of AES. |
| * @param[in,out] buffer Data to be encrypted. The encrypted date will be stored |
| * in this buffer. |
| * @param[in] buffer_size size of data to be encrypted. |
| * @param[in] iv The initialization vector. The size is equal to blk_len. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE and |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters, |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_sym_aes_encrypt(uint8_t * key, |
| TPM2_ALG_ID tpm_sym_alg, |
| TPMI_AES_KEY_BITS key_bits, |
| TPM2_ALG_ID tpm_mode, |
| size_t blk_len, |
| uint8_t * buffer, |
| size_t buffer_size, |
| uint8_t * iv) |
| { |
| gcry_cipher_hd_t cipher_hd; |
| gcry_error_t err; |
| TSS2_RC r; |
| |
| if (key == NULL || buffer == NULL) { |
| LOG_ERROR("Bad reference"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| r = iesys_cryptogcry_sym_aes_init(&cipher_hd, key, tpm_sym_alg, |
| key_bits, tpm_mode, blk_len, iv); |
| if (r != TSS2_RC_SUCCESS) |
| return r; |
| LOGBLOB_TRACE(buffer, buffer_size, "IESYS AES input"); |
| err = gcry_cipher_encrypt(cipher_hd, buffer, buffer_size, NULL, 0); |
| LOGBLOB_TRACE(buffer, buffer_size, "IESYS AES output"); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_encrypt"); |
| r = TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| gcry_cipher_close(cipher_hd); |
| return r; |
| } |
| |
| /** Decrypt data with AES. |
| * |
| * @param[in] key key used for AES. |
| * @param[in] tpm_sym_alg AES type in TSS2 notation (must be TPM2_ALG_AES). |
| * @param[in] key_bits Key size in bits. |
| * @param[in] tpm_mode Block cipher mode of opertion in TSS2 notation (CFB). |
| * @param[in] blk_len Length Block length of AES. |
| * @param[in,out] buffer Data to be decrypted. The decrypted date will be stored |
| * in this buffer. |
| * @param[in] buffer_size size of data to be encrypted. |
| * @param[in] iv The initialization vector. The size is equal to blk_len. |
| * @retval TSS2_RC_SUCCESS on success, or TSS2_ESYS_RC_BAD_VALUE and |
| * @retval TSS2_ESYS_RC_BAD_REFERENCE for invalid parameters, |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for errors of the crypto library. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_sym_aes_decrypt(uint8_t * key, |
| TPM2_ALG_ID tpm_sym_alg, |
| TPMI_AES_KEY_BITS key_bits, |
| TPM2_ALG_ID tpm_mode, |
| size_t blk_len, |
| uint8_t * buffer, |
| size_t buffer_size, |
| uint8_t * iv) |
| { |
| gcry_cipher_hd_t cipher_hd; |
| gcry_error_t err; |
| TSS2_RC r; |
| |
| if (key == NULL || buffer == NULL) { |
| LOG_ERROR("Bad reference"); |
| return TSS2_ESYS_RC_BAD_REFERENCE; |
| } |
| |
| if (tpm_sym_alg != TPM2_ALG_AES) { |
| LOG_ERROR("AES expected"); |
| return TSS2_ESYS_RC_BAD_VALUE; |
| } |
| |
| r = iesys_cryptogcry_sym_aes_init(&cipher_hd, key, tpm_sym_alg, |
| key_bits, tpm_mode, blk_len, iv); |
| if (r != TSS2_RC_SUCCESS) |
| return r; |
| err = gcry_cipher_decrypt(cipher_hd, buffer, buffer_size, NULL, 0); |
| if (err != GPG_ERR_NO_ERROR) { |
| LOG_ERROR("Function gcry_cipher_decrypt"); |
| r = TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| gcry_cipher_close(cipher_hd); |
| return r; |
| } |
| |
| /** Initialize gcrypt crypto backend. |
| * |
| * Initialize gcrypt internal tables. |
| * |
| * @retval TSS2_RC_SUCCESS ong success. |
| * @retval TSS2_ESYS_RC_GENERAL_FAILURE for version mismatch. |
| */ |
| TSS2_RC |
| iesys_cryptogcry_init() { |
| if (!gcry_check_version (GCRYPT_VERSION)) |
| { |
| LOG_ERROR("Version mismatch for gcrypt"); |
| return TSS2_ESYS_RC_GENERAL_FAILURE; |
| } |
| return TSS2_RC_SUCCESS; |
| } |
