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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
INCLUDES = """
#include <openssl/hmac.h>
"""
TYPES = """
typedef ... HMAC_CTX;
"""
FUNCTIONS = """
int Cryptography_HMAC_Init_ex(HMAC_CTX *, const void *, int, const EVP_MD *,
ENGINE *);
int Cryptography_HMAC_Update(HMAC_CTX *, const unsigned char *, size_t);
int Cryptography_HMAC_Final(HMAC_CTX *, unsigned char *, unsigned int *);
int Cryptography_HMAC_CTX_copy(HMAC_CTX *, HMAC_CTX *);
HMAC_CTX *Cryptography_HMAC_CTX_new(void);
void Cryptography_HMAC_CTX_free(HMAC_CTX *ctx);
"""
MACROS = """
"""
CUSTOMIZATIONS = """
int Cryptography_HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int key_len,
const EVP_MD *md, ENGINE *impl) {
#if OPENSSL_VERSION_NUMBER >= 0x010000000
return HMAC_Init_ex(ctx, key, key_len, md, impl);
#else
HMAC_Init_ex(ctx, key, key_len, md, impl);
return 1;
#endif
}
int Cryptography_HMAC_Update(HMAC_CTX *ctx, const unsigned char *data,
size_t data_len) {
#if OPENSSL_VERSION_NUMBER >= 0x010000000
return HMAC_Update(ctx, data, data_len);
#else
HMAC_Update(ctx, data, data_len);
return 1;
#endif
}
int Cryptography_HMAC_Final(HMAC_CTX *ctx, unsigned char *digest,
unsigned int *outlen) {
#if OPENSSL_VERSION_NUMBER >= 0x010000000
return HMAC_Final(ctx, digest, outlen);
#else
HMAC_Final(ctx, digest, outlen);
return 1;
#endif
}
int Cryptography_HMAC_CTX_copy(HMAC_CTX *dst_ctx, HMAC_CTX *src_ctx) {
#if OPENSSL_VERSION_NUMBER >= 0x010000000
return HMAC_CTX_copy(dst_ctx, src_ctx);
#else
HMAC_CTX_init(dst_ctx);
if (!EVP_MD_CTX_copy_ex(&dst_ctx->i_ctx, &src_ctx->i_ctx)) {
goto err;
}
if (!EVP_MD_CTX_copy_ex(&dst_ctx->o_ctx, &src_ctx->o_ctx)) {
goto err;
}
if (!EVP_MD_CTX_copy_ex(&dst_ctx->md_ctx, &src_ctx->md_ctx)) {
goto err;
}
memcpy(dst_ctx->key, src_ctx->key, HMAC_MAX_MD_CBLOCK);
dst_ctx->key_length = src_ctx->key_length;
dst_ctx->md = src_ctx->md;
return 1;
err:
return 0;
#endif
}
HMAC_CTX *Cryptography_HMAC_CTX_new(void) {
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
return HMAC_CTX_new();
#else
/* This uses OPENSSL_zalloc in 1.1.0, which is malloc + memset */
HMAC_CTX *ctx = (HMAC_CTX *)OPENSSL_malloc(sizeof(HMAC_CTX));
memset(ctx, 0, sizeof(HMAC_CTX));
/*if (ctx)
if (!HMAC_CTX_reset(ctx)) {
HMAC_CTX_free(ctx);
ctx = NULL;
}*/
return ctx;
#endif
}
void Cryptography_HMAC_CTX_free(HMAC_CTX *ctx) {
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
return HMAC_CTX_free(ctx);
#else
if (ctx != NULL) {
ctx->md = NULL;
ctx->key_length = 0;
memset(ctx->key, 0, sizeof(HMAC_MAX_MD_CBLOCK));
HMAC_CTX_cleanup(ctx);
OPENSSL_free(ctx);
}
#endif
}
"""
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