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.
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@ -61,6 +61,25 @@
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and later. If you're building for an older cat, well, sorry. */
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# define COMMON_DIGEST_FOR_OPENSSL
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# include <CommonCrypto/CommonDigest.h>
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#elif defined(_WIN32)
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/* For Windows: If no other crypto library is provided, we fallback
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to the hash functions provided within the Microsoft Windows CryptoAPI */
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# include <WinCrypt.h>
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/* Custom structure in order to store the required provider and hash handle */
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struct win32_crypto_hash {
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HCRYPTPROV hCryptProv;
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HCRYPTHASH hHash;
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};
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/* Custom Microsoft AES Cryptographic Provider defines required for MinGW */
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# ifndef ALG_SID_SHA_256
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# define ALG_SID_SHA_256 12
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# endif
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# ifndef CALG_SHA_256
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# define CALG_SHA_256 (ALG_CLASS_HASH | ALG_TYPE_ANY | ALG_SID_SHA_256)
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# endif
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# define MD5_CTX struct win32_crypto_hash
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# define SHA_CTX struct win32_crypto_hash
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# define SHA256_CTX struct win32_crypto_hash
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#else
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# error "Can't compile METALINK support without a crypto library."
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#endif
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@ -200,6 +219,82 @@ static void SHA256_Final(unsigned char digest[32], SHA256_CTX *ctx)
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gcry_md_close(*ctx);
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}
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#elif defined(_WIN32)
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static void win32_crypto_final(struct win32_crypto_hash *ctx,
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unsigned char *digest,
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unsigned int digestLen)
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{
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unsigned long length;
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CryptGetHashParam(ctx->hHash, HP_HASHVAL, NULL, &length, 0);
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if(length == digestLen)
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CryptGetHashParam(ctx->hHash, HP_HASHVAL, digest, &length, 0);
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if(ctx->hHash)
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CryptDestroyHash(ctx->hHash);
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if(ctx->hCryptProv)
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CryptReleaseContext(ctx->hCryptProv, 0);
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}
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static void MD5_Init(MD5_CTX *ctx)
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{
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if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL,
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PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
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CryptCreateHash(ctx->hCryptProv, CALG_MD5, 0, 0, &ctx->hHash);
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}
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}
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static void MD5_Update(MD5_CTX *ctx,
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const unsigned char *input,
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unsigned int inputLen)
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{
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CryptHashData(ctx->hHash, (unsigned char *)input, inputLen, 0);
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}
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static void MD5_Final(unsigned char digest[16], MD5_CTX *ctx)
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{
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win32_crypto_final(ctx, digest, 16);
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}
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static void SHA1_Init(SHA_CTX *ctx)
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{
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if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL,
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PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
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CryptCreateHash(ctx->hCryptProv, CALG_SHA1, 0, 0, &ctx->hHash);
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}
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}
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static void SHA1_Update(SHA_CTX *ctx,
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const unsigned char *input,
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unsigned int inputLen)
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{
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CryptHashData(ctx->hHash, (unsigned char *)input, inputLen, 0);
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}
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static void SHA1_Final(unsigned char digest[20], SHA_CTX *ctx)
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{
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win32_crypto_final(ctx, digest, 20);
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}
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static void SHA256_Init(SHA256_CTX *ctx)
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{
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if(CryptAcquireContext(&ctx->hCryptProv, NULL, NULL,
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PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
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CryptCreateHash(ctx->hCryptProv, CALG_SHA_256, 0, 0, &ctx->hHash);
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}
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}
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static void SHA256_Update(SHA256_CTX *ctx,
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const unsigned char *input,
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unsigned int inputLen)
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{
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CryptHashData(ctx->hHash, (unsigned char *)input, inputLen, 0);
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}
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static void SHA256_Final(unsigned char digest[32], SHA256_CTX *ctx)
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{
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win32_crypto_final(ctx, digest, 32);
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}
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#endif /* CRYPTO LIBS */
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const digest_params MD5_DIGEST_PARAMS[] = {
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