core/auth-crt/src/main/java/software/amazon/awssdk/authcrt/signer/internal/SigningUtils.java [91:103]:
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    public static AwsCredentials sanitizeCredentials(AwsCredentials credentials) {
        String accessKeyId = StringUtils.trim(credentials.accessKeyId());
        String secretKey = StringUtils.trim(credentials.secretAccessKey());

        if (credentials instanceof AwsSessionCredentials) {
            AwsSessionCredentials sessionCredentials = (AwsSessionCredentials) credentials;
            return AwsSessionCredentials.create(accessKeyId,
                    secretKey,
                    StringUtils.trim(sessionCredentials.sessionToken()));
        }

        return AwsBasicCredentials.create(accessKeyId, secretKey);
    }
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core/auth/src/main/java/software/amazon/awssdk/auth/signer/internal/AbstractAwsSigner.java [239:251]:
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    protected AwsCredentials sanitizeCredentials(AwsCredentials credentials) {
        String accessKeyId = StringUtils.trim(credentials.accessKeyId());
        String secretKey = StringUtils.trim(credentials.secretAccessKey());

        if (credentials instanceof AwsSessionCredentials) {
            AwsSessionCredentials sessionCredentials = (AwsSessionCredentials) credentials;
            return AwsSessionCredentials.create(accessKeyId,
                                                secretKey,
                                                StringUtils.trim(sessionCredentials.sessionToken()));
        }

        return AwsBasicCredentials.create(accessKeyId, secretKey);
    }
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