private String generateSignature()

in src/main/java/software/aws/mcs/auth/SigV4AuthProvider.java [263:286]

• 17 lines of code
• 1 McCabe index (conditional complexity)

    private String generateSignature(byte[] nonce, Instant requestTimestamp, AwsCredentials credentials) throws UnsupportedEncodingException {
        String credentialScopeDate = Aws4SignerUtils.formatDateStamp(requestTimestamp.toEpochMilli());

        String signingScope = String.format("%s/%s/%s/aws4_request", credentialScopeDate, signingRegion, CANONICAL_SERVICE);

        String nonceHash = sha256Digest(nonce);

        String canonicalRequest = canonicalizeRequest(credentials.accessKeyId(), signingScope, requestTimestamp, nonceHash);

        String stringToSign = String.format("%s\n%s\n%s\n%s",
                                            SignerConstant.AWS4_SIGNING_ALGORITHM,
                                            timestampFormatter.format(requestTimestamp),
                                            signingScope,
                                            sha256Digest(canonicalRequest));

        byte[] signingKey = getSignatureKey(credentials.secretAccessKey(),
                                            credentialScopeDate,
                                            signingRegion,
                                            CANONICAL_SERVICE);

        byte[] signature = hmacSHA256(stringToSign, signingKey);

        return Hex.encodeHexString(signature, true);
    }