Question

我需要使用Sha1算法在Java中使用Key Vault来实现签名，但不受支持，我该如何实现，我尝试使用弹性城堡进行摘要，并使用具有RSNULL算法的密钥库客户端，但是结果不正确。

    String stringToSign = "holamund";
    byte[] digestSha1Bytes = DigestUtils.sha1(stringToSign.getBytes());
    keyOperationResult = keyVaultClient.sign("AZURE_URL_KEY",   JsonWebKeySignatureAlgorithm.RSNULL, digestSha1Bytes);

输出生成：IoGXIIIZ5ZyM2m7ozz / ET8UOWWTwmKeseJVvs9w9cPHz11wKFZ / ikGx2Sj4Adhcn32QCDBOSv / knaTvPyw + EXkVX / 3NrAmxuIUUGhQF4 / muu7Y2644IWuECXqp8o1iXL8mN7sCEB5sh0sNArK77dvfRk7A0unZR / 82wpFxMjxYYeh8k / CiFRHK / MWX6sZe + 1Rm6vDmkaodyRqR1LsusS0wzOiuVdTXNkyL55MaTs5cLpWIpbHU + H4YaAO1 + B + nFVkJeeDDGbjHvmMO1EO / KT7HSHReOukYR2mwKxklzCZA3DWRp3pSi9Rdirpoc / IvFIOcWcYK44xfx0UKVHDzhZ4w ==

输出预期：pHOyaoTuOTELmTbfgRPg12tJP0JdjQY1GsdMR63s8L8hMb4lsirmalxSVRm5D2ed2d6PMdMxvA + OjUW / Pxzx5R8M5b3SeIiXde5JloOKoOc2PbKIGJI5Sf7 + yCSowCSgTdxmwkTQdBCZWeRhw1hs5hNJW / uBkbImdF0RtR478JxePH9AYEHOFjanLlI5 / OHzduPS8Px9qzQIr / KYRWk32Z14dUGPctYeT5ttY7lYu4ksTeyCwea5booNaZAN8EnT41s564cCPR2ZdYirzcNnWlTQxD7innpuFWP + rvLZHLYp3y + iiYIU6eyJurDoTUHHzTp + mEQSD / IMtgE43FWb6w ==

我尝试使用不同的api（例如充气城堡，java native等）进行摘要，但是没有找到正确的约定以与密钥库标志一起使用。

Answer 1

在Azure Key Vault中，RSNULL算法提供了原始的RSA签名。为了使用原始的SHA1签名算法生成标准的RSA签名，必须首先将摘要包装到将要签名的ASN.1 DigestInfo结构中。以下示例显示：

import java.io.IOException;
import java.security.KeyPair;
import java.security.MessageDigest;
import java.security.Signature;
import com.microsoft.azure.keyvault.KeyVaultClient;
import com.microsoft.azure.keyvault.models.KeyBundle;
import com.microsoft.azure.keyvault.models.KeyOperationResult;
import com.microsoft.azure.keyvault.webkey.JsonWebKey;
import com.microsoft.azure.keyvault.webkey.JsonWebKeySignatureAlgorithm;

...

/**
 * @param keyVaultClient An instance of Key Vault client.
 * @param keyIdentifer The Key Identifier. This is the kid field of JsonWebKey structure.
 * @param message The message to be signed.
 */
void sampleSHA1SignatureWithAzureKeyVault(KeyVaultClient keyVaultClient, String keyIdentifer, byte[] message) throws Throwable {

    /////////////////////////////////////////
    // Signs message using Azure Key Vault //
    /////////////////////////////////////////

    // Compute SHA1 hash:
    MessageDigest md = MessageDigest.getInstance("SHA1");
    md.update(message);
    byte[] digest = md.digest();

    // Convert SHA1 digest into ASN.1:
    byte[] digestInfo = getDigestInfoForSHA1Digest(digest);

    // Call Azure Key Vault to perform the signature using the server key.
    // Note that we are passing the DigestInfo to RSNULL, instead of SHA1 digest.
    KeyOperationResult result = keyVaultClient.sign(keyIdentifer, JsonWebKeySignatureAlgorithm.RSNULL, digestInfo);
    byte[] signature = result.result();

    /////////////////////////////////////////////////////////
    // Verifies the signature locally, using java.security //
    /////////////////////////////////////////////////////////

    // Read the public key from Azure Key Vault
    KeyBundle keyBundle = keyVaultClient.getKey(keyIdentifer);

    // Initialize java.security instances with the Public Key and message.
    KeyPair kp = keyBundle.key().toRSA(false);
    Signature signImpl = Signature.getInstance("SHA1withRSA");
    signImpl.initVerify(kp.getPublic());
    signImpl.update(message);

    // Verify the signature.
    if (signImpl.verify(signature))
        System.out.println("Signature was verified.");
    else
        System.out.println("Signature verification failed.");
}

byte[] getDigestInfoForSHA1Digest(byte[] digest) {

    // Constructs an ASN.1 DigestInfo structure for the caller-specified SHA1 hash.

    // ASN.1 data:
    byte[] digestInfo = new byte[] { //
            0x30, 0x21, // SEQUENCE DigestInfo (33 bytes) (13 of header + 20 of SHA1 digest)
            0x30, 0x09, // SEQUENCE AlgorithmIdentifier (9 bytes)
            0x06, 0x05, // OBJECT IDENTIFIER algorithm (5 bytes)
            0x2b, 0x0e, 0x03, 0x02, 0x1a, // OID of SHA1 (1.3.14.3.2.26)
            0x05, 0x00, // NUL algorithm parameters (05 00 is the DER encoding for NUL)
            0x04, 0x14, // OCTET STRING digest (20 bytes)
            00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00 // SHA1, copied below
    };

    System.arraycopy(digest, 0, digestInfo, 15, digest.length);

    return digestInfo;
}

如何使用Microsoft Azure密钥库和Java实现SHA-1？

1 个答案: