Example usage for com.amazonaws.auth AbstractAWSSigner EMPTY_STRING_SHA256_HEX

Introduction

In this page you can find the example usage for com.amazonaws.auth AbstractAWSSigner EMPTY_STRING_SHA256_HEX.

Prototype

String EMPTY_STRING_SHA256_HEX

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Usage

From source file:com.ibm.og.s3.v4.AwsChunkedEncodingInputStream.java

License:Open Source License

private byte[] createSignedChunk(final byte[] chunkData) {
    final StringBuilder chunkHeader = new StringBuilder();
    // chunk-size
    chunkHeader.append(Integer.toHexString(chunkData.length));

    byte[] chunkDigest;
    if (this.digestCache != null) {
        try {//from  www. j  a  v  a2s  . c  o m
            chunkDigest = this.digestCache.get((long) chunkData.length);
        } catch (final ExecutionException e) {
            throw new RuntimeException(e);
        }
    } else {
        chunkDigest = this.sha256.digest(chunkData);
    }

    // sig-extension
    final String chunkStringToSign = CHUNK_STRING_TO_SIGN_PREFIX + "\n" + this.dateTime + "\n" + this.keyPath
            + "\n" + this.priorChunkSignature + "\n" + AbstractAWSSigner.EMPTY_STRING_SHA256_HEX + "\n"
            + BinaryUtils.toHex(chunkDigest);

    final String chunkSignature = BinaryUtils
            .toHex(this.aws4Signer.signWithMac(chunkStringToSign, this.hmacSha256));
    this.priorChunkSignature = chunkSignature;
    chunkHeader.append(CHUNK_SIGNATURE_HEADER).append(chunkSignature).append(CRLF);
    try {
        final byte[] header = chunkHeader.toString().getBytes(UTF8);
        final byte[] trailer = CRLF.getBytes(UTF8);
        final byte[] signedChunk = new byte[header.length + chunkData.length + trailer.length];
        System.arraycopy(header, 0, signedChunk, 0, header.length);
        System.arraycopy(chunkData, 0, signedChunk, header.length, chunkData.length);
        System.arraycopy(trailer, 0, signedChunk, header.length + chunkData.length, trailer.length);
        return signedChunk;
    } catch (final Exception e) {
        throw new AmazonClientException("Unable to sign the chunked data. " + e.getMessage(), e);
    }
}

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