| /** |
| * \file pkcs7.h |
| * |
| * \brief PKCS #7 generic defines and structures |
| * https://tools.ietf.org/html/rfc2315 |
| */ |
| /* |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * Note: For the time being, this implementation of the PKCS #7 cryptographic |
| * message syntax is a partial implementation of RFC 2315. |
| * Differences include: |
| * - The RFC specifies 6 different content types. The only type currently |
| * supported in Mbed TLS is the signed-data content type. |
| * - The only supported PKCS #7 Signed Data syntax version is version 1 |
| * - The RFC specifies support for BER. This implementation is limited to |
| * DER only. |
| * - The RFC specifies that multiple digest algorithms can be specified |
| * in the Signed Data type. Only one digest algorithm is supported in Mbed TLS. |
| * - The RFC specifies the Signed Data type can contain multiple X.509 or PKCS #6 extended |
| * certificates. In Mbed TLS, this list can only contain 0 or 1 certificates |
| * and they must be in X.509 format. |
| * - The RFC specifies the Signed Data type can contain |
| * certificate-revocation lists (CRLs). This implementation has no support |
| * for CRLs so it is assumed to be an empty list. |
| * - The RFC allows for SignerInfo structure to optionally contain |
| * unauthenticatedAttributes and authenticatedAttributes. In Mbed TLS it is |
| * assumed these fields are empty. |
| * - The RFC allows for the signed Data type to contain contentInfo. This |
| * implementation assumes the type is DATA and the content is empty. |
| */ |
| |
| #ifndef MBEDTLS_PKCS7_H |
| #define MBEDTLS_PKCS7_H |
| |
| #include "mbedtls/private_access.h" |
| |
| #include "mbedtls/build_info.h" |
| |
| #include "mbedtls/asn1.h" |
| #include "mbedtls/x509.h" |
| #include "mbedtls/x509_crt.h" |
| |
| /** |
| * \name PKCS #7 Module Error codes |
| * \{ |
| */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_FORMAT -0x5300 /**< The format is invalid, e.g. different type expected. */ |
| #define MBEDTLS_ERR_PKCS7_FEATURE_UNAVAILABLE -0x5380 /**< Unavailable feature, e.g. anything other than signed data. */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_VERSION -0x5400 /**< The PKCS #7 version element is invalid or cannot be parsed. */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_CONTENT_INFO -0x5480 /**< The PKCS #7 content info is invalid or cannot be parsed. */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_ALG -0x5500 /**< The algorithm tag or value is invalid or cannot be parsed. */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_CERT -0x5580 /**< The certificate tag or value is invalid or cannot be parsed. */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_SIGNATURE -0x5600 /**< Error parsing the signature */ |
| #define MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO -0x5680 /**< Error parsing the signer's info */ |
| #define MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA -0x5700 /**< Input invalid. */ |
| #define MBEDTLS_ERR_PKCS7_ALLOC_FAILED -0x5780 /**< Allocation of memory failed. */ |
| #define MBEDTLS_ERR_PKCS7_VERIFY_FAIL -0x5800 /**< Verification Failed */ |
| #define MBEDTLS_ERR_PKCS7_CERT_DATE_INVALID -0x5880 /**< The PKCS #7 date issued/expired dates are invalid */ |
| /* \} name */ |
| |
| /** |
| * \name PKCS #7 Supported Version |
| * \{ |
| */ |
| #define MBEDTLS_PKCS7_SUPPORTED_VERSION 0x01 |
| /* \} name */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * Type-length-value structure that allows for ASN.1 using DER. |
| */ |
| typedef mbedtls_asn1_buf mbedtls_pkcs7_buf; |
| |
| /** |
| * Container for ASN.1 named information objects. |
| * It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.). |
| */ |
| typedef mbedtls_asn1_named_data mbedtls_pkcs7_name; |
| |
| /** |
| * Container for a sequence of ASN.1 items |
| */ |
| typedef mbedtls_asn1_sequence mbedtls_pkcs7_sequence; |
| |
| /** |
| * PKCS #7 types |
| */ |
| typedef enum { |
| MBEDTLS_PKCS7_NONE=0, |
| MBEDTLS_PKCS7_DATA, |
| MBEDTLS_PKCS7_SIGNED_DATA, |
| MBEDTLS_PKCS7_ENVELOPED_DATA, |
| MBEDTLS_PKCS7_SIGNED_AND_ENVELOPED_DATA, |
| MBEDTLS_PKCS7_DIGESTED_DATA, |
| MBEDTLS_PKCS7_ENCRYPTED_DATA, |
| } |
| mbedtls_pkcs7_type; |
| |
| /** |
| * Structure holding PKCS #7 signer info |
| */ |
| typedef struct mbedtls_pkcs7_signer_info { |
| int MBEDTLS_PRIVATE(version); |
| mbedtls_x509_buf MBEDTLS_PRIVATE(serial); |
| mbedtls_x509_name MBEDTLS_PRIVATE(issuer); |
| mbedtls_x509_buf MBEDTLS_PRIVATE(issuer_raw); |
| mbedtls_x509_buf MBEDTLS_PRIVATE(alg_identifier); |
| mbedtls_x509_buf MBEDTLS_PRIVATE(sig_alg_identifier); |
| mbedtls_x509_buf MBEDTLS_PRIVATE(sig); |
| struct mbedtls_pkcs7_signer_info *MBEDTLS_PRIVATE(next); |
| } |
| mbedtls_pkcs7_signer_info; |
| |
| /** |
| * Structure holding the signed data section |
| */ |
| typedef struct mbedtls_pkcs7_signed_data { |
| int MBEDTLS_PRIVATE(version); |
| mbedtls_pkcs7_buf MBEDTLS_PRIVATE(digest_alg_identifiers); |
| int MBEDTLS_PRIVATE(no_of_certs); |
| mbedtls_x509_crt MBEDTLS_PRIVATE(certs); |
| int MBEDTLS_PRIVATE(no_of_crls); |
| mbedtls_x509_crl MBEDTLS_PRIVATE(crl); |
| int MBEDTLS_PRIVATE(no_of_signers); |
| mbedtls_pkcs7_signer_info MBEDTLS_PRIVATE(signers); |
| } |
| mbedtls_pkcs7_signed_data; |
| |
| /** |
| * Structure holding PKCS #7 structure, only signed data for now |
| */ |
| typedef struct mbedtls_pkcs7 { |
| mbedtls_pkcs7_buf MBEDTLS_PRIVATE(raw); |
| mbedtls_pkcs7_signed_data MBEDTLS_PRIVATE(signed_data); |
| } |
| mbedtls_pkcs7; |
| |
| /** |
| * \brief Initialize mbedtls_pkcs7 structure. |
| * |
| * \param pkcs7 mbedtls_pkcs7 structure. |
| */ |
| void mbedtls_pkcs7_init(mbedtls_pkcs7 *pkcs7); |
| |
| /** |
| * \brief Parse a single DER formatted PKCS #7 detached signature. |
| * |
| * \param pkcs7 The mbedtls_pkcs7 structure to be filled by the parser. |
| * \param buf The buffer holding only the DER encoded PKCS #7 content. |
| * \param buflen The size in bytes of \p buf. The size must be exactly the |
| * length of the DER encoded PKCS #7 content. |
| * |
| * \note This function makes an internal copy of the PKCS #7 buffer |
| * \p buf. In particular, \p buf may be destroyed or reused |
| * after this call returns. |
| * \note Signatures with internal data are not supported. |
| * |
| * \return The \c mbedtls_pkcs7_type of \p buf, if successful. |
| * \return A negative error code on failure. |
| */ |
| int mbedtls_pkcs7_parse_der(mbedtls_pkcs7 *pkcs7, const unsigned char *buf, |
| const size_t buflen); |
| |
| /** |
| * \brief Verification of PKCS #7 signature against a caller-supplied |
| * certificate. |
| * |
| * For each signer in the PKCS structure, this function computes |
| * a signature over the supplied data, using the supplied |
| * certificate and the same digest algorithm as specified by the |
| * signer. It then compares this signature against the |
| * signer's signature; verification succeeds if any comparison |
| * matches. |
| * |
| * This function does not use the certificates held within the |
| * PKCS #7 structure itself, and does not check that the |
| * certificate is signed by a trusted certification authority. |
| * |
| * \param pkcs7 mbedtls_pkcs7 structure containing signature. |
| * \param cert Certificate containing key to verify signature. |
| * \param data Plain data on which signature has to be verified. |
| * \param datalen Length of the data. |
| * |
| * \note This function internally calculates the hash on the supplied |
| * plain data for signature verification. |
| * |
| * \return 0 if the signature verifies, or a negative error code on failure. |
| */ |
| int mbedtls_pkcs7_signed_data_verify(mbedtls_pkcs7 *pkcs7, |
| const mbedtls_x509_crt *cert, |
| const unsigned char *data, |
| size_t datalen); |
| |
| /** |
| * \brief Verification of PKCS #7 signature against a caller-supplied |
| * certificate. |
| * |
| * For each signer in the PKCS structure, this function |
| * validates a signature over the supplied hash, using the |
| * supplied certificate and the same digest algorithm as |
| * specified by the signer. Verification succeeds if any |
| * signature is good. |
| * |
| * This function does not use the certificates held within the |
| * PKCS #7 structure itself, and does not check that the |
| * certificate is signed by a trusted certification authority. |
| * |
| * \param pkcs7 PKCS #7 structure containing signature. |
| * \param cert Certificate containing key to verify signature. |
| * \param hash Hash of the plain data on which signature has to be verified. |
| * \param hashlen Length of the hash. |
| * |
| * \note This function is different from mbedtls_pkcs7_signed_data_verify() |
| * in that it is directly passed the hash of the data. |
| * |
| * \return 0 if the signature verifies, or a negative error code on failure. |
| */ |
| int mbedtls_pkcs7_signed_hash_verify(mbedtls_pkcs7 *pkcs7, |
| const mbedtls_x509_crt *cert, |
| const unsigned char *hash, size_t hashlen); |
| |
| /** |
| * \brief Unallocate all PKCS #7 data and zeroize the memory. |
| * It doesn't free \p pkcs7 itself. This should be done by the caller. |
| * |
| * \param pkcs7 mbedtls_pkcs7 structure to free. |
| */ |
| void mbedtls_pkcs7_free(mbedtls_pkcs7 *pkcs7); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* pkcs7.h */ |