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tool_metalink.c: Added support for Microsoft Windows CryptoAPI 

Since Metalink support requires a crypto library for hash functions
and Windows comes with the builtin CryptoAPI, this patch adds that
API as a fallback to the supported crypto libraries.
It is automatically used on Windows if no other library is provided.
This commit is contained in:
Marc Hoersken 2012-09-11 01:58:10 +02:00
parent c8846c0907
commit 94c3e0f702
1 changed files with 95 additions and 0 deletions
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95
src/tool_metalink.c
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@ -61,6 +61,25 @@
and later. If you're building for an older cat, well, sorry. */
# define COMMON_DIGEST_FOR_OPENSSL
# include <CommonCrypto/CommonDigest.h>
#elif defined(_WIN32)
/* For Windows: If no other crypto library is provided, we fallback
to the hash functions provided within the Microsoft Windows CryptoAPI */
# include <WinCrypt.h>
/* Custom structure in order to store the required provider and hash handle */
struct win32_crypto_hash {
HCRYPTPROV hCryptProv;
HCRYPTHASH hHash;
};
/* Custom Microsoft AES Cryptographic Provider defines required for MinGW */
# ifndef ALG_SID_SHA_256
# define ALG_SID_SHA_256 12
# endif
# ifndef CALG_SHA_256
# define CALG_SHA_256 (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SHA_256)
# endif
# define MD5_CTX struct win32_crypto_hash
# define SHA_CTX struct win32_crypto_hash
# define SHA256_CTX struct win32_crypto_hash
#else
# error "Can't compile METALINK support without a crypto library."
#endif
@ -200,6 +219,82 @@ static void SHA256_Final(unsigned char digest[32], SHA256_CTX *ctx)
gcry_md_close(*ctx);
}
#elif defined(_WIN32)
static void win32_crypto_final(struct win32_crypto_hash *ctx,
unsigned char *digest,
unsigned int digestLen)
{
unsigned long length;
CryptGetHashParam(ctx->hHash, HP_HASHVAL, NULL, &length, 0);
if(length == digestLen)
CryptGetHashParam(ctx->hHash, HP_HASHVAL, digest, &length, 0);
if(ctx->hHash)
CryptDestroyHash(ctx->hHash);
if(ctx->hCryptProv)
CryptReleaseContext(ctx->hCryptProv, 0);
}
static void MD5_Init(MD5_CTX *ctx)
{
if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL,
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
CryptCreateHash(ctx->hCryptProv, CALG_MD5, 0, 0, &ctx->hHash);
}
}
static void MD5_Update(MD5_CTX *ctx,
const unsigned char *input,
unsigned int inputLen)
{
CryptHashData(ctx->hHash, (unsigned char *)input, inputLen, 0);
}
static void MD5_Final(unsigned char digest[16], MD5_CTX *ctx)
{
win32_crypto_final(ctx, digest, 16);
}
static void SHA1_Init(SHA_CTX *ctx)
{
if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL,
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
CryptCreateHash(ctx->hCryptProv, CALG_SHA1, 0, 0, &ctx->hHash);
}
}
static void SHA1_Update(SHA_CTX *ctx,
const unsigned char *input,
unsigned int inputLen)
{
CryptHashData(ctx->hHash, (unsigned char *)input, inputLen, 0);
}
static void SHA1_Final(unsigned char digest[20], SHA_CTX *ctx)
{
win32_crypto_final(ctx, digest, 20);
}
static void SHA256_Init(SHA256_CTX *ctx)
{
if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL,
PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
CryptCreateHash(ctx->hCryptProv, CALG_SHA_256, 0, 0, &ctx->hHash);
}
}
static void SHA256_Update(SHA256_CTX *ctx,
const unsigned char *input,
unsigned int inputLen)
{
CryptHashData(ctx->hHash, (unsigned char *)input, inputLen, 0);
}
static void SHA256_Final(unsigned char digest[32], SHA256_CTX *ctx)
{
win32_crypto_final(ctx, digest, 32);
}
#endif /* CRYPTO LIBS */
const digest_params MD5_DIGEST_PARAMS[] = {