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crypto: Support DER encodings

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Add encoding interfaces for DER encoding:
1. support decoding of 'bit string', 'octet string', 'object id'
and 'context specific tag' for DER encoder.
2. implemented a simple DER encoder.
3. add more testsuits for DER encoder.

Signed-off-by: lei he <helei.sig11@bytedance.com>
Message-Id: <20221008085030.70212-3-helei.sig11@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Lei He
2022-10-08 16:50:28 +08:00
committed by Michael S. Tsirkin
parent 2fda101de0
commit 3b34ccad66
3 changed files with 600 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

211
crypto/der.h
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@@ -22,6 +22,11 @@
#include "qapi/error.h"
typedef struct QCryptoEncodeContext QCryptoEncodeContext;
/* rsaEncryption: 1.2.840.113549.1.1.1 */
#define QCRYPTO_OID_rsaEncryption "\x2A\x86\x48\x86\xF7\x0D\x01\x01\x01"
/* Simple decoder used to parse DER encoded rsa keys. */
/**
@@ -47,14 +52,13 @@ typedef int (*QCryptoDERDecodeCb) (void *opaque, const uint8_t *value,
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded INTEGER will be returned. Otherwise, -1 is
* returned.
* returned and the valued of *data and *dlen keep unchanged.
*/
int qcrypto_der_decode_int(const uint8_t **data,
size_t *dlen,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
/**
* qcrypto_der_decode_seq:
*
@@ -70,7 +74,7 @@ int qcrypto_der_decode_int(const uint8_t **data,
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded SEQUENCE will be returned. Otherwise, -1 is
* returned.
* returned and the valued of *data and *dlen keep unchanged.
*/
int qcrypto_der_decode_seq(const uint8_t **data,
size_t *dlen,
@@ -78,4 +82,205 @@ int qcrypto_der_decode_seq(const uint8_t **data,
void *opaque,
Error **errp);
/**
* qcrypto_der_decode_oid:
*
* Decode OID from DER-encoded data, similar with der_decode_int.
*
* @data: pointer to address of input data
* @dlen: pointer to length of input data
* @cb: callback invoked when decode succeed, if cb equals NULL, no
* callback will be invoked
* @opaque: parameter passed to cb
*
* Returns: On success, *data points to rest data, and *dlen
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded OID will be returned. Otherwise, -1 is
* returned and the valued of *data and *dlen keep unchanged.
*/
int qcrypto_der_decode_oid(const uint8_t **data,
size_t *dlen,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
/**
* qcrypto_der_decode_octet_str:
*
* Decode OCTET STRING from DER-encoded data, similar with der_decode_int.
*
* @data: pointer to address of input data
* @dlen: pointer to length of input data
* @cb: callback invoked when decode succeed, if cb equals NULL, no
* callback will be invoked
* @opaque: parameter passed to cb
*
* Returns: On success, *data points to rest data, and *dlen
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded OCTET STRING will be returned. Otherwise, -1 is
* returned and the valued of *data and *dlen keep unchanged.
*/
int qcrypto_der_decode_octet_str(const uint8_t **data,
size_t *dlen,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
/**
* qcrypto_der_decode_bit_str:
*
* Decode BIT STRING from DER-encoded data, similar with der_decode_int.
*
* @data: pointer to address of input data
* @dlen: pointer to length of input data
* @cb: callback invoked when decode succeed, if cb equals NULL, no
* callback will be invoked
* @opaque: parameter passed to cb
*
* Returns: On success, *data points to rest data, and *dlen
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded BIT STRING will be returned. Otherwise, -1 is
* returned and the valued of *data and *dlen keep unchanged.
*/
int qcrypto_der_decode_bit_str(const uint8_t **data,
size_t *dlen,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
/**
* qcrypto_der_decode_ctx_tag:
*
* Decode context specific tag
*
* @data: pointer to address of input data
* @dlen: pointer to length of input data
* @tag: expected value of context specific tag
* @cb: callback invoked when decode succeed, if cb equals NULL, no
* callback will be invoked
* @opaque: parameter passed to cb
*
* Returns: On success, *data points to rest data, and *dlen
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded BIT STRING will be returned. Otherwise, -1 is
* returned and the valued of *data and *dlen keep unchanged.
*/
int qcrypto_der_decode_ctx_tag(const uint8_t **data,
size_t *dlen, int tag_id,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
/**
* qcrypto_der_encode_ctx_new:
*
* Allocate a context used for der encoding.
*/
QCryptoEncodeContext *qcrypto_der_encode_ctx_new(void);
/**
* qcrypto_der_encode_seq_begin:
* @ctx: the encode context.
*
* Start encoding a SEQUENCE for ctx.
*
*/
void qcrypto_der_encode_seq_begin(QCryptoEncodeContext *ctx);
/**
* qcrypto_der_encode_seq_begin:
* @ctx: the encode context.
*
* Finish uencoding a SEQUENCE for ctx.
*
*/
void qcrypto_der_encode_seq_end(QCryptoEncodeContext *ctx);
/**
* qcrypto_der_encode_oid:
* @ctx: the encode context.
* @src: the source data of oid, note it should be already encoded, this
* function only add tag and length part for it.
*
* Encode an oid into ctx.
*/
void qcrypto_der_encode_oid(QCryptoEncodeContext *ctx,
const uint8_t *src, size_t src_len);
/**
* qcrypto_der_encode_int:
* @ctx: the encode context.
* @src: the source data of integer, note it should be already encoded, this
* function only add tag and length part for it.
*
* Encode an integer into ctx.
*/
void qcrypto_der_encode_int(QCryptoEncodeContext *ctx,
const uint8_t *src, size_t src_len);
/**
* qcrypto_der_encode_null:
* @ctx: the encode context.
*
* Encode a null into ctx.
*/
void qcrypto_der_encode_null(QCryptoEncodeContext *ctx);
/**
* qcrypto_der_encode_octet_str:
* @ctx: the encode context.
* @src: the source data of the octet string.
*
* Encode a octet string into ctx.
*/
void qcrypto_der_encode_octet_str(QCryptoEncodeContext *ctx,
const uint8_t *src, size_t src_len);
/**
* qcrypto_der_encode_octet_str_begin:
* @ctx: the encode context.
*
* Start encoding a octet string, All fields between
* qcrypto_der_encode_octet_str_begin and qcrypto_der_encode_octet_str_end
* are encoded as an octet string. This is useful when we need to encode a
* encoded SEQUNCE as OCTET STRING.
*/
void qcrypto_der_encode_octet_str_begin(QCryptoEncodeContext *ctx);
/**
* qcrypto_der_encode_octet_str_end:
* @ctx: the encode context.
*
* Finish encoding a octet string, All fields between
* qcrypto_der_encode_octet_str_begin and qcrypto_der_encode_octet_str_end
* are encoded as an octet string. This is useful when we need to encode a
* encoded SEQUNCE as OCTET STRING.
*/
void qcrypto_der_encode_octet_str_end(QCryptoEncodeContext *ctx);
/**
* qcrypto_der_encode_ctx_buffer_len:
* @ctx: the encode context.
*
* Compute the expected buffer size to save all encoded things.
*/
size_t qcrypto_der_encode_ctx_buffer_len(QCryptoEncodeContext *ctx);
/**
* qcrypto_der_encode_ctx_flush_and_free:
* @ctx: the encode context.
* @dst: the distination to save the encoded data, the length of dst should
* not less than qcrypto_der_encode_cxt_buffer_len
*
* Flush all encoded data into dst, then free ctx.
*/
void qcrypto_der_encode_ctx_flush_and_free(QCryptoEncodeContext *ctx,
uint8_t *dst);
#endif /* QCRYPTO_ASN1_DECODER_H */