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Diffstat (limited to 'include/mbedtls/pkcs7.h')
| -rw-r--r-- | include/mbedtls/pkcs7.h | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/include/mbedtls/pkcs7.h b/include/mbedtls/pkcs7.h new file mode 100644 index 0000000..70b25a9 --- /dev/null +++ b/include/mbedtls/pkcs7.h @@ -0,0 +1,241 @@ +/** + * \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 OR GPL-2.0-or-later + */ + +/** + * 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 */ |