{"record":{"id":"a53f714aac24070f","repo":"jwtk/jjwt","slug":"unable-to-verify-getid-signature-with-jca-alg","errorCode":null,"errorMessage":"Unable to verify ${getId()} signature with JCA algorithm '${getJcaName()}' using key {${key}}: ${e.getMessage()}","messagePattern":"Unable to verify (.+?) signature with JCA algorithm '(.+?)' using key (.+?): (.+?)","errorType":"exception","errorClass":"SignatureException","httpStatus":null,"severity":"error","filePath":"impl/src/main/java/io/jsonwebtoken/impl/security/AbstractSecureDigestAlgorithm.java","lineNumber":74,"sourceCode":"    }\n\n    protected abstract byte[] doDigest(SecureRequest<InputStream, S> request) throws Exception;\n\n    @Override\n    public final boolean verify(VerifySecureDigestRequest<V> request) throws SecurityException {\n        Assert.notNull(request, \"Request cannot be null.\");\n        final V key = Assert.notNull(request.getKey(), \"Verification key cannot be null.\");\n        Assert.notNull(request.getPayload(), \"Request content cannot be null or empty.\");\n        Assert.notEmpty(request.getDigest(), \"Request signature byte array cannot be null or empty.\");\n        try {\n            validateKey(key, false);\n            return doVerify(request);\n        } catch (SignatureException | KeyException e) {\n            throw e; //propagate\n        } catch (Exception e) {\n            String msg = \"Unable to verify \" + getId() + \" signature with JCA algorithm '\" + getJcaName() + \"' \" +\n                    \"using key {\" + KeysBridge.toString(key) + \"}: \" + e.getMessage();\n            throw new SignatureException(msg, e);\n        }\n    }\n\n    protected abstract boolean doVerify(VerifySecureDigestRequest<V> request);\n}\n","sourceCodeStart":56,"sourceCodeEnd":80,"githubUrl":"https://github.com/jwtk/jjwt/blob/fb71496164c71442d08adec4571d9616ed5e1b8d/impl/src/main/java/io/jsonwebtoken/impl/security/AbstractSecureDigestAlgorithm.java#L56-L80","documentation":"AbstractSecureDigestAlgorithm.verify catches unexpected exceptions from the underlying JCA verification and wraps them in SignatureException, identifying the algorithm id, JCA name, key, and cause message. Like digest, SignatureException/KeyException pass through unmodified.","triggerScenarios":"Verifying a signature where the JCA layer fails: provider lacks the algorithm, key type/provider mismatch, or bad internal state on the Signature instance.","commonSituations":"Verifying EdDSA or RS256 signatures on a JDK without the algorithm; using a public key from a different key pair family; hardware/provider keys not initialized.","solutions":["Check e.getCause() for the underlying provider failure.","Confirm the verification algorithm exists on the runtime JVM/provider.","Ensure the verifying PublicKey corresponds to the signing PrivateKey and kty.","Install a provider such as BouncyCastle for algorithms absent from the default set."],"exampleFix":"// before\nboolean ok = alg.verify(req); // SignatureException: Unable to verify ES256 ...\n// after\ntry { boolean ok = alg.verify(req); }\ncatch (SignatureException e) { throw new GeneralSecurityException(e.getCause()); }","handlingStrategy":"try-catch","validationCode":"try { Signature.getInstance(alg.getJcaName()); } catch (NoSuchAlgorithmException e) { /* unavailable */ }","typeGuard":"boolean canVerify(Key k) { return k instanceof PublicKey || k instanceof SecretKey; }","tryCatchPattern":"try { boolean ok = alg.verify(req); }\ncatch (SignatureException e) { return VerificationResult.error(e.getCause()); }","preventionTips":["Ensure the public key corresponds to the signer's private key.","Check provider availability at startup, not per-request.","Avoid reusing Signature instances across threads."],"tags":["signature","verification","jca","jjwt"],"backgroundTag":"signature-verification-failed","analyzedSha":"fb71496164c71442d08adec4571d9616ed5e1b8d","analyzedAt":"2026-09-09T00:33:09.982Z","contentChangedAt":"2026-09-09T00:33:09.982Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}