Changes the hash API to support accumulative hashing.
Hash objects are created with "qcrypto_hash_new",
updated with data with "qcrypto_hash_update", and
the hash obtained with "qcrypto_hash_finalize".
These changes bring the hashing API more in line with the
hmac API.
Signed-off-by: Alejandro Zeise <alejandro.zeise@seagate.com>
---
crypto/hashpriv.h | 13 +++++
include/crypto/hash.h | 119 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 132 insertions(+)
diff --git a/crypto/hashpriv.h b/crypto/hashpriv.h
index cee26ccb47..02f17ee99f 100644
--- a/crypto/hashpriv.h
+++ b/crypto/hashpriv.h
@@ -1,6 +1,7 @@
/*
* QEMU Crypto hash driver supports
*
+ * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
* Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
@@ -15,6 +16,8 @@
#ifndef QCRYPTO_HASHPRIV_H
#define QCRYPTO_HASHPRIV_H
+#include "crypto/hash.h"
+
typedef struct QCryptoHashDriver QCryptoHashDriver;
struct QCryptoHashDriver {
@@ -24,6 +27,16 @@ struct QCryptoHashDriver {
uint8_t **result,
size_t *resultlen,
Error **errp);
+ QCryptoHash *(*hash_new)(QCryptoHashAlgorithm alg, Error **errp);
+ int (*hash_update)(QCryptoHash *hash,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp);
+ int (*hash_finalize)(QCryptoHash *hash,
+ uint8_t **result,
+ size_t *resultlen,
+ Error **errp);
+ void (*hash_free)(QCryptoHash *hash);
};
extern QCryptoHashDriver qcrypto_hash_lib_driver;
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 54d87aa2a1..6d7222867e 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -1,6 +1,7 @@
/*
* QEMU Crypto hash algorithms
*
+ * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
@@ -25,6 +26,13 @@
/* See also "QCryptoHashAlgorithm" defined in qapi/crypto.json */
+typedef struct QCryptoHash QCryptoHash;
+struct QCryptoHash {
+ QCryptoHashAlgorithm alg;
+ void *opaque;
+ void *driver;
+};
+
/**
* qcrypto_hash_supports:
* @alg: the hash algorithm
@@ -120,6 +128,117 @@ int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
char **digest,
Error **errp);
+/**
+ * qcrypto_hash_updatev:
+ * @hash: hash object from qcrypto_hash_new
+ * @iov: the array of memory regions to hash
+ * @niov: the length of @iov
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Updates the given hash object with all the memory regions
+ * present in @iov.
+ *
+ * Returns: 0 on success, non-zero on error
+ */
+int qcrypto_hash_updatev(QCryptoHash *hash,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp);
+/**
+ * qcrypto_hash_update:
+ * @hash: hash object from qcrypto_hash_new
+ * @buf: the memory region to hash
+ * @len: the length of @buf
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Updates the given hash object with the data from
+ * the given buffer.
+ *
+ * Returns: 0 on success, non-zero on error
+ */
+int qcrypto_hash_update(QCryptoHash *hash,
+ const char *buf,
+ size_t len,
+ Error **errp);
+
+/**
+ * qcrypto_hash_finalize_digest:
+ * @hash: the hash object to finalize
+ * @digest: pointer to hold output hash
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Computes the hash from the given hash object. Hash object
+ * is expected to have its data updated from the qcrypto_hash_update function.
+ * The @digest pointer will be filled with the printable hex digest of the
+ * computed hash, which will be terminated by '\0'. The memory pointer
+ * in @digest must be released with a call to g_free() when
+ * no longer required.
+ *
+ * Returns: 0 on success, non-zero on error
+ */
+int qcrypto_hash_finalize_digest(QCryptoHash *hash,
+ char **digest,
+ Error **errp);
+
+/**
+ * qcrypto_hash_finalize_base64:
+ * @hash_ctx: hash object to finalize
+ * @base64: pointer to store the hash result in
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Computes the hash from the given hash object. Hash object
+ * is expected to have it's data updated from the qcrypto_hash_update function.
+ * The @base64 pointer will be filled with the base64 encoding of the computed
+ * hash, which will be terminated by '\0'. The memory pointer in @base64
+ * must be released with a call to g_free() when no longer required.
+ *
+ * Returns: 0 on success, non-zero on error
+ */
+int qcrypto_hash_finalize_base64(QCryptoHash *hash,
+ char **base64,
+ Error **errp);
+
+/**
+ * qcrypto_hash_finalize_bytes:
+ * @hash_ctx: hash object to finalize
+ * @result: pointer to store the hash result in
+ * @result_len: Pointer to store the length of the result in
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Computes the hash from the given hash object. Hash object
+ * is expected to have it's data updated from the qcrypto_hash_update function.
+ * The memory pointer in @result must be released with a call to g_free()
+ * when no longer required.
+ *
+ * Returns: 0 on success, non-zero on error
+ */
+int qcrypto_hash_finalize_bytes(QCryptoHash *hash,
+ uint8_t **result,
+ size_t *result_len,
+ Error **errp);
+
+/**
+ * qcrypto_hash_new:
+ * @alg: the hash algorithm
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Creates a new hashing context for the chosen algorithm for
+ * usage with qcrypto_hash_update.
+ *
+ * Returns: New hash object with the given algorithm, or NULL on error.
+ */
+QCryptoHash *qcrypto_hash_new(QCryptoHashAlgorithm alg, Error **errp);
+
+/**
+ * qcrypto_hash_free:
+ * @hash: hash object to free
+ *
+ * Frees a hashing context for the chosen algorithm.
+ */
+void qcrypto_hash_free(QCryptoHash *hash);
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoHash, qcrypto_hash_free)
+
/**
* qcrypto_hash_digest:
* @alg: the hash algorithm
--
2.34.1On Wed, Aug 07, 2024 at 07:51:08PM +0000, Alejandro Zeise wrote:
> Changes the hash API to support accumulative hashing.
> Hash objects are created with "qcrypto_hash_new",
> updated with data with "qcrypto_hash_update", and
> the hash obtained with "qcrypto_hash_finalize".
>
> These changes bring the hashing API more in line with the
> hmac API.
>
> Signed-off-by: Alejandro Zeise <alejandro.zeise@seagate.com>
> ---
> crypto/hashpriv.h | 13 +++++
> include/crypto/hash.h | 119 ++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 132 insertions(+)
>
> diff --git a/crypto/hashpriv.h b/crypto/hashpriv.h
> index cee26ccb47..02f17ee99f 100644
> --- a/crypto/hashpriv.h
> +++ b/crypto/hashpriv.h
> @@ -1,6 +1,7 @@
> /*
> * QEMU Crypto hash driver supports
> *
> + * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
> * Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
> *
> * Authors:
> @@ -15,6 +16,8 @@
> #ifndef QCRYPTO_HASHPRIV_H
> #define QCRYPTO_HASHPRIV_H
>
> +#include "crypto/hash.h"
> +
> typedef struct QCryptoHashDriver QCryptoHashDriver;
>
> struct QCryptoHashDriver {
> @@ -24,6 +27,16 @@ struct QCryptoHashDriver {
> uint8_t **result,
> size_t *resultlen,
> Error **errp);
> + QCryptoHash *(*hash_new)(QCryptoHashAlgorithm alg, Error **errp);
> + int (*hash_update)(QCryptoHash *hash,
> + const struct iovec *iov,
> + size_t niov,
> + Error **errp);
> + int (*hash_finalize)(QCryptoHash *hash,
> + uint8_t **result,
> + size_t *resultlen,
> + Error **errp);
> + void (*hash_free)(QCryptoHash *hash);
> };
>
> extern QCryptoHashDriver qcrypto_hash_lib_driver;
> diff --git a/include/crypto/hash.h b/include/crypto/hash.h
> index 54d87aa2a1..6d7222867e 100644
> --- a/include/crypto/hash.h
> +++ b/include/crypto/hash.h
> @@ -1,6 +1,7 @@
> /*
> * QEMU Crypto hash algorithms
> *
> + * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
> * Copyright (c) 2015 Red Hat, Inc.
> *
> * This library is free software; you can redistribute it and/or
> @@ -25,6 +26,13 @@
>
> /* See also "QCryptoHashAlgorithm" defined in qapi/crypto.json */
>
> +typedef struct QCryptoHash QCryptoHash;
> +struct QCryptoHash {
> + QCryptoHashAlgorithm alg;
> + void *opaque;
> + void *driver;
> +};
> +
> /**
> * qcrypto_hash_supports:
> * @alg: the hash algorithm
> @@ -120,6 +128,117 @@ int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
> char **digest,
> Error **errp);
>
> +/**
> + * qcrypto_hash_updatev:
> + * @hash: hash object from qcrypto_hash_new
> + * @iov: the array of memory regions to hash
> + * @niov: the length of @iov
> + * @errp: pointer to a NULL-initialized error object
> + *
> + * Updates the given hash object with all the memory regions
> + * present in @iov.
> + *
> + * Returns: 0 on success, non-zero on error
Minor point, this and all the other APIs should be saying
'or -1 on error' to follow QEMU's error reporting standards.
With regards,
Daniel
--
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Daniel P. Berrangé <berrange@redhat.com> writes:
> On Wed, Aug 07, 2024 at 07:51:08PM +0000, Alejandro Zeise wrote:
>> Changes the hash API to support accumulative hashing.
>> Hash objects are created with "qcrypto_hash_new",
>> updated with data with "qcrypto_hash_update", and
>> the hash obtained with "qcrypto_hash_finalize".
>>
>> These changes bring the hashing API more in line with the
>> hmac API.
>>
>> Signed-off-by: Alejandro Zeise <alejandro.zeise@seagate.com>
[...]
>> diff --git a/include/crypto/hash.h b/include/crypto/hash.h
>> index 54d87aa2a1..6d7222867e 100644
>> --- a/include/crypto/hash.h
>> +++ b/include/crypto/hash.h
>> @@ -1,6 +1,7 @@
>> /*
>> * QEMU Crypto hash algorithms
>> *
>> + * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
>> * Copyright (c) 2015 Red Hat, Inc.
>> *
>> * This library is free software; you can redistribute it and/or
>> @@ -25,6 +26,13 @@
>>
>> /* See also "QCryptoHashAlgorithm" defined in qapi/crypto.json */
>>
>> +typedef struct QCryptoHash QCryptoHash;
>> +struct QCryptoHash {
>> + QCryptoHashAlgorithm alg;
>> + void *opaque;
>> + void *driver;
>> +};
>> +
>> /**
>> * qcrypto_hash_supports:
>> * @alg: the hash algorithm
>> @@ -120,6 +128,117 @@ int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
>> char **digest,
>> Error **errp);
>>
>> +/**
>> + * qcrypto_hash_updatev:
>> + * @hash: hash object from qcrypto_hash_new
>> + * @iov: the array of memory regions to hash
>> + * @niov: the length of @iov
>> + * @errp: pointer to a NULL-initialized error object
>> + *
>> + * Updates the given hash object with all the memory regions
>> + * present in @iov.
>> + *
>> + * Returns: 0 on success, non-zero on error
>
> Minor point, this and all the other APIs should be saying
> 'or -1 on error' to follow QEMU's error reporting standards.
Specifically, qapi/error.h:
* - Whenever practical, also return a value that indicates success /
* failure. This can make the error checking more concise, and can
* avoid useless error object creation and destruction. Note that
* we still have many functions returning void. We recommend
* • bool-valued functions return true on success / false on failure,
* • pointer-valued functions return non-null / null pointer, and
* • integer-valued functions return non-negative / negative.
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